Contracts completed and in progress: Completed and in Progress [Member] Related to completed and in progress. Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Working capital contributions gva_WorkingCapitalDeficit Represents the value of total current assets net of current liabilities as of the balance sheet date. Disaggregation of Income Statement Expense, Caption [Table] Disaggregation of Income Statement Expense, Caption [Table] Statistical Measurement [Domain] Statistical Measurement [Domain] Property and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Business Combination [Abstract] Debt Instrument, Redemption, Period Four Debt Instrument, Redemption, Period Four [Member] Heating oil derivatives Commodity Contract [Member] Contract assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract Assets Award Timing Predetermined Award Timing Predetermined [Flag] Related Party Transaction [Axis] Related Party Transaction [Axis] Construction Joint Ventures Construction Joint Ventures [Text Block] The entire disclosure for construction joint ventures. Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Asset Class [Axis] Asset Class [Axis] Goodwill that is tax deductible Business Combination, Goodwill, Expected Tax Deductible, Amount Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Interest rate swaps Interest Rate Swap [Member] Revenue recognized Contract With Customer, Liability, Revenue Recognized Including Opening Balance The amount of revenue recognized including opening balance of contract with customer liability. Other (Income) Expense, Net Other Income and Other Expense Disclosure [Text Block] Net income from affiliates Equity in income of affiliates, net Income (Loss) from Equity Method Investments Tabular List, Table Tabular List [Table Text Block] Accounts payable Increase (Decrease) in Accounts Payable Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Total contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Carrying Values and Estimated Fair Values of Financial Instruments Not Required to be Recorded at Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Schedule of Change in Accounting Estimates Schedule of Change in Accounting Estimate [Table Text Block] Repurchases of common stock Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Measurement Basis [Axis] Measurement Basis [Axis] Basic (USD per share) Net income per share, basic (USD per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Commercial paper Commercial Paper [Member] Contract Assets and Liabilities Revenue from Contract with Customer [Text Block] Debt Instrument, Amortization Period, One Debt Instrument, Amortization Period, One [Member] Debt Instrument, Amortization Period, One Unbilled Unbilled Receivables, Current Other comprehensive income, net of tax Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Corporate Joint Venture Corporate Joint Venture [Member] Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Debt instrument, convertible, threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Remaining performance obligation Revenue, Remaining Performance Obligation, Amount Measurement Input Type [Domain] Measurement Input Type [Domain] Unconsolidated construction joint venture liabilities Unconsolidated construction joint venture liabilities The amount of unconsolidated construction joint venture liabilities. Adjustment to Compensation, Amount Adjustment to Compensation Amount Revenue Revenue from Collaborative Arrangement, Excluding Revenue from Contract with Customer Other assets, net Increase (Decrease) in Other Operating Assets Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Market yield for comparable non-convertible debt instrument Measurement Input, Market Yield [Member] Measurement Input, Market Yield Employee Stock Option Share-Based Payment Arrangement, Option [Member] U.S. Government and agency obligations US Government Corporations and Agencies Securities [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Income (Loss) Attributable to Noncontrolling Interest, before Tax Income (Loss) Attributable to Noncontrolling Interest, before Tax Total Granite Construction Incorporated shareholders’ equity Equity, Attributable to Parent Measurement Frequency [Axis] Measurement Frequency [Axis] Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Property and Equipment, net Property, Plant and Equipment [Table Text Block] Common stock, authorized (shares) Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Credit Agreement Notes Payable, Fair Value Disclosure Current assets: Assets, Current [Abstract] Total liabilities and equity Liabilities and Equity Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Fair Value, Recurring Fair Value, Recurring [Member] Disaggregation of Revenue Disaggregation Of Revenue [Text Block] Represents disaggregation Of revenue. Denominator Preferred Stock Dividends and Other Adjustments [Abstract] Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Cover [Abstract] Cash equivalents: Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Debt Instrument, Convertible, Threshold Consecutive Trading Days Debt Instrument, Convertible, Threshold Consecutive Trading Days Maximum Maximum [Member] Schedule of Equity Method Investments [Table] Equity Method Investment [Table] Amount attributable to non-controlling interests Net Income (Loss) Attributable to Noncontrolling Interest Revenue Recognition and Deferred Revenue [Abstract] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Equity in construction joint ventures Equity In Construction Joint Ventures, Current Assets Excluding Deficit In Equity Equity in construction joint ventures current assets excluding deficit in equity. Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Debt Instrument, Redemption, Period One Debt Instrument, Redemption, Period One [Member] Contract liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract Liabilities Acquisitions Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Depreciation, depletion and amortization Depreciation, Depletion and Amortization, Nonproduction Income (loss) before income taxes Change to project profitability, net Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Revolver Senior Secured Revolving Credit Facility ("Revolver") [Member] Senior Secured Revolving Credit Facility ("Revolver") Debt instrument, redemption price, percentage of principal amount redeemed Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Other long-term liabilities Other Liabilities, Noncurrent Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Cash (up to) per $1,000 principal Convertible Debt, Settlement, Cash Per Principal, Maximum Convertible Debt, Settlement, Cash Per Principal, Maximum Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Accrued expenses and other liabilities, net Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Net unrealized gain on cash flow hedges, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Current maturities of long-term debt Less: current maturities Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount Non-controlling interests in comprehensive income (loss), net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Debt Issuance Costs, Gross Debt Issuance Costs, Gross Comprehensive income (loss) attributable to Granite Construction Incorporated, net of tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Measurement Input Type [Axis] Measurement Input Type [Axis] Name Measure Name Secured Debt Secured Debt [Member] Short-term lease liabilities Operating Lease, Liability, Current Rollforward of Level 3 Derivative Liability Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Deferred income taxes, net Deferred Income Tax Liabilities, Net Cash, cash equivalents and marketable securities Unconsolidated Construction Joint Venture, Cash, Cash Equivalents And Marketable Securities The amount of unconsolidated construction joint venture cash, cash equivalents, and marketable securities. Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Office furniture and equipment Furniture and Fixtures [Member] Award Type Award Type [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Total debt Outstanding debt Long-Term Debt Legal Entity [Axis] Legal Entity [Axis] Pro Forma Financial Information Business Combination, Pro Forma Information [Table Text Block] Total assets Segment assets as of period end Assets Investment, Name [Domain] Investment, Name [Domain] Trading Symbol Trading Symbol Equity in unconsolidated construction joint ventures Equity in construction joint ventures Represents equity in construction joint ventures current assets. RSUs vested (shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Business Combination, Pro Forma Information [Line Items] Business Combination, Pro Forma Information [Line Items] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Unvested RSUs Restricted Stock Units (RSUs) [Member] Schedule of Change in Accounting Estimate [Table] Change in Accounting Estimate [Table] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Consideration transferred Business Combination, Consideration Transferred Asphalt Asphalt [Member] Asphalt Entity Emerging Growth Company Entity Emerging Growth Company Held-to-maturity marketable securities Debt Securities, Held-to-Maturity, Fair Value Dividends on common stock (USD per share) Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Right of use assets obtained in exchange for lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Repayments on revolver Repayments of Lines of Credit Billed Billed Contracts Receivable Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Revenue Revenue from Contract with Customer, Including Assessed Tax Debt issuance costs and other Debt Issuance Costs, Net Accrued insurance Accrued Insurance, Current Level 2 Fair Value, Inputs, Level 2 [Member] Investments in affiliates Granite’s share of net assets Equity Method Investments Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Other Other Business Products and Services [Member] Related to other business products and services. Common stock, outstanding (shares) Beginning balances (in shares) Ending balances (in shares) Common Stock, Shares, Outstanding Customer affirmative claims Affirmative Claim Recovery Estimate The amount of affirmative claim recovery estimate. Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] PEO PEO [Member] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Loss on derivative remeasurement related to convertible notes Derivative, Loss on Derivative Consolidated EBITDA ratio, maximum Debt Instrument, Covenant, Consolidated EBITDA Ratio, Maximum Debt Instrument, Covenant, Consolidated EBITDA Ratio, Maximum Interest income Interest income Investment Income, Interest Guarantees and Product Warranties [Abstract] Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Swingline Loans Swingline Loans [Member] Represents swingline loans. Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Performance guarantees Guarantor Obligations, Current Carrying Value Schedule of Product Information [Table] Nature of Operation, Product Information, Concentration of Risk [Table] Retained Earnings Retained Earnings [Member] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Debt instrument, aggregate principal percentage Debt Instrument, Aggregate Principal Amount, Percentage Debt Instrument, Aggregate Principal Amount, Percentage Income Statement [Abstract] Income Statement [Abstract] Provision for income taxes Income Tax Expense (Benefit) Variable interest rate Debt Instrument, Basis Spread on Variable Rate Purchases of marketable securities Payments to Acquire Marketable Securities Performance Guarantee Performance Guarantee [Member] Fair value at May 19, 2026 Fair value as of June 30, 2026 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Long-term marketable securities term (in years) Marketable Securities, Noncurrent, Term Marketable Securities, Noncurrent, Term Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Hedging Relationship [Axis] Hedging Relationship [Axis] Net change Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Property and equipment Property, Plant and Equipment, Gross Total Granite Shareholders’ Equity Parent [Member] Net income (loss) Net income (loss) Changes to net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total liabilities Liabilities, Fair Value Disclosure Business Combination [Table] Business Combination [Table] Notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Credit Agreement - Revolver The Credit Agreement The Credit Agreement [Member] Represents information related to the credit agreement. Schedule of Guarantor Obligations [Table] Guarantor Obligation [Table] Other Income and Expenses [Abstract] Schedule of Purchase Price and Assumed Liabilities Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Materials Materials [Member] Represents materials. City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Buildings and leasehold improvements Building and Building Improvements [Member] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Debt instrument, redemption price, percentage Debt Instrument, Redemption Price, Percentage Commitments and Contingencies Disclosure [Abstract] Draw down value Proceeds from Long-Term Lines of Credit Components of Contract Asset and Liability Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Maturities of marketable securities Proceeds from Sale and Maturity of Held-to-Maturity Securities Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Public Public [Member] Public Equity Method Investments and Joint Ventures [Abstract] Transactions with non-controlling interests Noncontrolling Interest, Period Increase (Decrease) Preferred stock, par value (USD per share) Preferred Stock, Par or Stated Value Per Share Subsequent Event Subsequent Event [Member] Equity Method Investment, Nonconsolidated Investee or Group of Investees Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] Other Other [Member] Other Other current assets Business Combination, Recognized Asset Acquired, Other Asset, Current Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Cash Flow Hedging Cash Flow Hedging [Member] Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Long-Term Debt, Measurement Input Long-Term Debt, Measurement Input PEO Total Compensation Amount PEO Total Compensation Amount Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Other Partners Interest in Partnerships Other Partners Interest in Partnerships [Member] Related to other partners interest in partnerships. Money market funds Money Market Funds [Member] Debt Instrument, Redemption, Period Three Debt Instrument, Redemption, Period Three [Member] Debt Instrument, Amortization Period [Domain] Debt Instrument, Amortization Period [Domain] Debt Instrument, Amortization Period [Domain] Revisions in Estimates Revisions in Estimates [Member] Revisions in Estimates Assets: Business Combination, Recognized Asset Acquired, Asset [Abstract] Accrued Expenses and Other Current Liabilities Other Liabilities Disclosure [Text Block] Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Revisions in Estimates, Increase Revisions in Estimates, Increase [Member] Represents information related to revisions in estimates. Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Convertible Debt Convertible Debt [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Reportable segments Number of Reportable Segments Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Supplementary Information: Supplemental Cash Flow Information [Abstract] Receivables Business Combination, Recognized Asset Acquired, Receivable, Current Other Performance Measure, Amount Other Performance Measure, Amount Debt issuance costs Payments of Debt Issuance Costs Entity Address, State or Province Entity Address, State or Province Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Dividends on common stock Dividends, Common Stock Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Current liabilities Liabilities, Current Current liabilities Unconsolidated Construction Joint Venture, Current Liabilities The amount of unconsolidated construction joint venture current liabilities. Derivative Instrument [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Change in Accounting Estimate [Line Items] Change in Accounting Estimate [Line Items] Accounting Changes and Error Corrections [Abstract] Cash dividends paid Payments of Ordinary Dividends, Common Stock Other current assets ($3,267 and $3,255 related to CCJVs) Other Assets, Current Additional paid-in capital Additional Paid in Capital, Common Stock Effect of Change in Accounting Estimate, Type [Axis] Effect of Change in Accounting Estimate, Type [Axis] Sublimit for letters of credit Line Of Credit Covenant Minimum Cash Balance The minimum cash balance under the line of credit agreement. Entity [Domain] Entity [Domain] Equity in net income from unconsolidated construction joint ventures Granite’s interest in net income (loss) Unconsolidated Construction Joint Venture Net Income (Loss) Amount of income (loss) for proportionate share of unconsolidated construction joint venture. Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Investments in affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Expected timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Contributions from non-controlling partners Proceeds from Noncontrolling Interests Document Fiscal Year Focus Document Fiscal Year Focus Right of use assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Debt repayments Repayments of Long-Term Debt Effective tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Carrying Value Reported Value Measurement [Member] Acquisition-related costs Business Combination, Acquisition-Related Cost, Expense Contingencies - Legal Proceedings Legal Matters and Contingencies [Text Block] Distributions to non-controlling partners gva_DistributionsToNoncontrollingPartnersNet Represents net distributions to non-controlling partners. Operating cash flows Cash Provided by (Used in) Continuing Operation Reportable Segment Information Segment Reporting Disclosure [Text Block] Initial Term Loan Senior Secured Term Loan ("Initial Term Loan") [Member] Senior Secured Term Loan ("Initial Term Loan") Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Consolidated Construction Corporate Joint Venture Consolidated Construction Corporate Joint Venture [Member] Represents information related to consolidation construction corporate joint venture. Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Tangible assets acquired Total tangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Long-term marketable securities Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Noncurrent Other long-term liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Schedule Of Unearned Revenue Schedule Of Unearned Revenue [Table Text Block] Tabular disclosure of unearned revenue. Selling, general and administrative expenses Selling, General and Administrative Expense Materials sales Material Sales [Member] Related to material sales. Depreciation, depletion and amortization Depreciation, Depletion and Amortization Other noncurrent assets Other Assets, Noncurrent Conversion ratio Debt Instrument, Convertible, Conversion Ratio Customer [Domain] Customer [Domain] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Conversion price (USD per share) Debt Instrument, Convertible, Conversion Price Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Dilutive effect of Convertible Notes Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Collection of note receivable Proceeds from Collection of Notes Receivable Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Land and land improvements Land and Land Improvements [Member] Revolving Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Gross profit since acquisition date Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual Revenue adjustment Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price Contract liabilities ($52,672 and $63,500 related to CCJVs) Contract with Customer, Liability, Current Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Receivables Accounts Receivable, before Allowance for Credit Loss, Current Price per share (in dollars per share) Share Price Other investing activities Payment for (Proceeds from) Other Investing Activity Subsequent Event Type [Axis] Subsequent Event Type [Axis] Number of shares repurchased (in shares) Stock Repurchased and Retired During Period, Shares Identifiable intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent ASSETS Assets [Abstract] Long-term debt Total long-term debt Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Fair Value Measurement Fair Value Disclosures [Text Block] Loss on convertible debt transactions, net Gain (Loss) on Extinguishment of Debt Business Combination [Line Items] Business Combination [Line Items] Credit Facility [Domain] Credit Facility [Domain] Equity: Equity, Attributable to Parent [Abstract] Embedded conversion option derivative liability (see Note 9) Current liabilities: Derivative Liability, Current Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Investment, Name [Axis] Investment, Name [Axis] Less: allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Interest rate Debt Instrument, Interest Rate, Stated Percentage Repurchases of common stock (shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Long-term lease liabilities Operating Lease, Liability, Noncurrent Costs in excess of billings and estimated earnings Costs in excess of billings and estimated earnings Represents costs in excess of billings and estimated earnings. Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Unconsolidated construction joint venture assets Unconsolidated Construction Joint Venture, Assets The amount of unconsolidated construction joint venture assets. Claim recovery estimates gva_AggregateAffirmativeClaimRecoveryEstimateIncludedInContractAssetAndLiability Aggregate affirmative claim recovery estimate included in contract asset and liability balances. Fair Value as of Grant Date Award Grant Date Fair Value Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Collaborative Arrangement Collaborative Arrangement [Member] Nature of Expense [Axis] Nature of Expense [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Schedule of Other (Income) Expense, Net Schedule of Other Nonoperating Income (Expense) [Table Text Block] Schedule of Long-Term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Quarry property Mining Properties and Mineral Rights [Member] Dilutive effect of RSUs (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Debt Instrument, Redemption, Period Two Debt Instrument, Redemption, Period Two [Member] Add: Interest expense related to Convertible Notes Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Document Quarterly Report Document Quarterly Report Total assets Assets, Fair Value Disclosure Fair Value Measurement Inputs and Valuation Techniques Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Convertible debt inducement expense Induced Conversion of Convertible Debt Expense Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Note exchange transaction, consideration paid Repayments of Convertible Debt Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Related Party, Type [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Restatement Determination Date: Restatement Determination Date [Axis] Acquisition of business, net of cash acquired (See Note 3) Payments to Acquire Businesses, Gross RSUs vested Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Non-PEO NEO Non-PEO NEO [Member] Outstanding letters of credit Letters of Credit Outstanding, Amount Other financing activities, net Proceeds from (Payment for) Other Financing Activity Business Combination, Pro Forma Information [Table] Business Combination, Pro Forma Information [Table] Schedule of Unconsolidated Joint Ventures Revenue and Costs Schedule of Unconsolidated Joint Ventures Revenue and Costs [Table Text Block] Tabular disclosure of schedule of unconsolidated joint ventures revenues and costs. Business Combination, Recognized Liability Assumed, Liability [Abstract] Business Combination, Recognized Liability Assumed, Liability [Abstract] Name Trading Arrangement, Individual Name All Award Types Award Type [Domain] Variability in market yields for comparable debt instruments Measurement Input, Variability In Market Yields [Member] Measurement Input, Variability In Market Yields Non-controlling interests Equity, Attributable to Noncontrolling Interest Equity Awards Adjustments Equity Awards Adjustments [Member] Other non-cash adjustments Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Long-term lease liabilities Business Combination, Recognized Liability Assumed, Lease Obligation Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Schedule of Unconsolidated Joint Ventures Assets and Liabilities Schedule of Unconsolidated Joint Ventures Assets and Liabilities [Table Text Block] The tabular disclosure of assets and liabilities of unconsolidated joint ventures. Compensation Amount Outstanding Recovery Compensation Amount Principal amount Debt Instrument, Face Amount Real estate Real Estate Entities [Member] Represents real estate entities. Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Asphalt terminal Asphalt Terminal Entity [Member] Represent the asphalt terminal entity. Private Private [Member] Private Unconsolidated Construction Corporate Joint Venture Unconsolidated Construction Corporate Joint Venture [Member] Represents information related to unconsolidated construction corporate joint venture. MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Percentage of receivables gva_PercentageOfNetReceivablesIndividuallyMaximum Represents maximum individually percentage of net receivables. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Unused commitment fee Debt Instrument, Unused Commitment Fee Debt Instrument, Unused Commitment Fee Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Debt Instrument, Amortization Period, Two Debt Instrument, Amortization Period, Two [Member] Debt Instrument, Amortization Period, Two Financial Instruments [Domain] Financial Instruments [Domain] Noncurrent assets Unconsolidated Construction Joint Venture, Noncurrent Assets Unconsolidated construction joint venture assets noncurrent assets. Number of projects Number Of Active Joint Venture Projects The number of active joint venture projects. Segments [Domain] Segments [Domain] Senior Secured Term Loan Senior Secured Term Loan ("Delayed Draw Term Loan") [Member] Senior Secured Term Loan ("Delayed Draw Term Loan") Noncurrent assets Assets, Noncurrent Line of credit remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Less: reclassification for net gains (losses) included in interest expense, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Inventories Increase (Decrease) in Inventories Inventories Inventory, Net Minimum Minimum [Member] Less: accumulated depreciation and depletion Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Net income attributable to Granite Construction Incorporated Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable ($48,880 and $46,708 related to CCJVs) Accounts Payable, Current Operating lease liabilities Operating Lease, Payments Proceeds from partial unwind of capped call Proceeds From Partial Unwind Of Capped Call Proceeds From Partial Unwind Of Capped Call Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Dividends declared but not paid Dividends Payable Liabilities assumed Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability Net income (loss) attributable to common shareholders for diluted earnings per share Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Disaggregation of Income Statement Expense, Caption [Line Items] Disaggregation of Income Statement Expense, Caption [Line Items] RSUs issued, net of forfeitures RSUs issued, net of forfeitures Represents the number of restricted stock units issued during the period, net of forfeitures. Common stock, $0.01 par value, authorized 150,000,000 shares; issued and outstanding: 43,764,125 shares as of June 30, 2026 and 43,496,781 shares as of December 31, 2025 Common Stock, Value, Issued Reporting Entitys Interest in Joint Venture Reporting Entitys Interest in Joint Venture [Member] Related to the reporting entities interest in joint venture. Diluted (shares) Weighted average common shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Business Combination [Axis] Business Combination [Axis] Comprehensive income (loss), net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Non-controlling Interests Noncontrolling Interest [Member] Preferred stock, outstanding (shares) Preferred Stock, Shares Outstanding Debt Long-Term Debt [Text Block] Document Transition Report Document Transition Report Other noncurrent assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Ownership in joint venture Equity Method Investment, Ownership Percentage Recently Issued and Adopted Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Numerator Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Preferred stock, $0.01 par value, authorized 3,000,000 shares, none outstanding Preferred Stock, Value, Outstanding Underlying Securities Award Underlying Securities Amount Billings in excess of costs and estimated earnings, net of retention Billings in excess of costs and estimated earnings, net of retention Represents advance payments and billings in excess of costs incurred. Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount 6.375% Senior Notes 6.375% Senior Notes [Member] 6.375% Senior Notes Term Loan Credit Agreement - Term Loan Term Loan [Member] Term Loan Income Taxes Income Tax Disclosure [Text Block] Amount drawn under revolver Proceeds from Lines of Credit Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Foreign Foreign Affiliates [Member] Represents foreign affiliates. Deferred income taxes, net Business Combination, Recognized Liability Assumed, Deferred Tax Liability Total equity Beginning balances Ending balances Equity, Including Portion Attributable to Noncontrolling Interest Convertible notes Convertible Debt, Fair Value Disclosures Amortization of convertible debt discount Amortization of Debt Discount (Premium) Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Weighted Average Shares Outstanding and Net Loss Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Product and Service [Axis] Product and Service [Axis] Number of derivative instruments Derivative, Number of Instruments Held Derivative Contract [Domain] Derivative Contract [Domain] Revenue Revenue from Contract with Customer, Excluding Assessed Tax All Individuals All Individuals [Member] Effect of Change in Accounting Estimate, Type [Domain] Effect of Change in Accounting Estimate, Type [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Fair Value Disclosures [Abstract] Receivables Increase (Decrease) in Receivables Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Total current assets Current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Other Liabilities Disclosure [Abstract] Debt Instrument, Amortization Period [Axis] Debt Instrument, Amortization Period [Axis] Debt Instrument, Amortization Period Performance Obligations Performance Obligations [Member] Related to performance obligations. Capped Call Transaction, Price Per Share Capped Call Transaction, Price Per Share [Member] Capped Call Transaction, Price Per Share Fixed rate Derivative, Fixed Interest Rate Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Warren Paving Slats Lucas, LLC And Warren Paving, Inc. ("Warren Paving") [Member] Slats Lucas, LLC And Warren Paving, Inc. ("Warren Paving") Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Papich Construction Papich Construction Company, Inc. ("Papich Construction") [Member] Papich Construction Company, Inc. ("Papich Construction") Net income (loss) attributable to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Short-term marketable securities Marketable Securities, Current Sublimit for swingline loans Debt Instrument Covenant Minimum Acquisition Cash Consideration For Leverage Ratio The minimum acquisition cash consideration required for the consolidated leverage ratio under the debt agreement. Financial Standby Letter of Credit Financial Standby Letter of Credit [Member] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Reconciliation of Operating Profit (Loss) from Segments to Consolidated Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Current liabilities: Liabilities, Current [Abstract] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Gain on sales of property and equipment, net Corporate (gain) loss on sales of property and equipment, net Gain (Loss) on Disposition of Assets Revenue Business Combination, Pro Forma Information, Pro Forma Revenue Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Diluted (USD per share) Increase to net income/decrease to net loss per diluted share attributable to common shareholders (in dollars per share) Net income per share, diluted (USD per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(b) Security Title of 12(b) Security Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Granite’s interest in gross profit Unconsolidated Construction Joint Venture Gross Profit (Loss) Unconsolidated construction joint venture gross profit loss. Net income (loss) per share attributable to common shareholders Earnings Per Share [Abstract] Conversion of stock, common stock (shares) Conversion of Stock, Shares Converted Consolidation Items [Domain] Consolidation Items [Domain] Total other (income) expense, net Total other (income) expense, net Nonoperating Income (Expense) Contract retention Contract retention The amount of retention from contracts with customers. Gross profit Range of change in gross profit from each project, net Gross Profit Quarterly Financial Information Disclosure [Abstract] Embedded conversion option derivative liability Embedded Derivative Financial Instruments [Member] Stock-based compensation expense and other Stockholders' Equity, Other Provisions for losses Provision for Loss on Contracts Revisions in Estimates Revisions in Estimates [Text Block] The entire disclosure for revisions in estimates. Default percentage Debt Instrument, Percentage Of Principal, Default Debt Instrument, Percentage Of Principal, Default Total tangible and identifiable net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Intangible Assets, and Liabilities Assumed, Net Business Combination, Recognized Identifiable Assets Acquired, Intangible Assets, and Liabilities Assumed, Net Other current assets Unconsolidated Construction Joint Venture, Other Current Assets The amount of unconsolidated construction joint venture current assets, classified as other. Performance guarantees Performance guarantees Amount of performance guarantee in connection with a noncash transaction. Income taxes: Income Taxes Paid, Net Award Timing Disclosures [Line Items] Payroll and related employee benefits Employee-related Liabilities, Current Measurement Frequency [Domain] Measurement Frequency [Domain] Property and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Partial unwind of capped call Equity-Classified Written Call Option, Modification, Equity Issuance, Increase (Decrease) in Equity, Amount Net income (loss) attributable to Granite Construction Incorporated Changes to net income (loss) attributable to Granite Construction Incorporated Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Share in equity of joint venture Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 3.75% Convertible Notes 3.75% Convertible Notes [Member] 3.75% Convertible Notes Other Other Accrued Liabilities, Current Repurchase of 3.75% Convertible Notes Adjustments to Additional Paid in Capital, Repurchase Of Convertible Notes Adjustments to Additional Paid in Capital, Repurchase Of Convertible Notes Product Information [Line Items] Product Information [Line Items] Equity Method Investments Equity Method Investments [Table Text Block] Property and equipment, net ($4,831 and $4,961 related to CCJVs) Property and equipment, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, authorized (shares) Preferred Stock, Shares Authorized Repurchases of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Base Rate Base Rate [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Short-term lease liabilities Guaranty Liabilities, Current This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur, which are expected to be paid in the next twelve months or in the normal operating cycle if longer . Contract assets ($36,185 and $34,057 related to CCJVs) Contract with Customer, Asset, after Allowance for Credit Loss Entity Current Reporting Status Entity Current Reporting Status Consolidation, Eliminations Consolidation, Eliminations [Member] Receivables [Abstract] Customer [Axis] Customer [Axis] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Number of projects with estimate changes Number Of Projects With Estimate Changes Represents number of projects with downward estimate changes. Operating income Operating income (loss) Operating Income (Loss) Line of Credit Line of Credit [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Co-venturer Co-venturer [Member] Retained earnings Accumulated deficit Retained Earnings (Accumulated Deficit) Cinderlite Cinderlite Trucking Corporation ("Cinderlite") [Member] Cinderlite Trucking Corporation ("Cinderlite") Right of use assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Right-of-Use Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Right-of-Use Assets Accrued expenses and other current liabilities ($3,277 and $2,922 related to CCJVs) Total Accrued expenses and other current liabilities Represents information related to accrued expenses and other current liabilities. Gain on sales of property and equipment, net Gain (Loss) on Disposition of Property Plant Equipment Financial Instrument [Axis] Financial Instrument [Axis] Investments in Affiliates Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Noncash Item [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Other costs, net Other Operating Income (Expense), Net Class of Stock [Axis] Class of Stock [Axis] Proceeds from long-term debt Proceeds from Issuance of Long-Term Debt Current Fiscal Year End Date Current Fiscal Year End Date Subsequent Event Type [Domain] Subsequent Event Type [Domain] Accrued expenses and other current liabilities Business Combination, Recognized Liability Assumed, Other Liability, Current Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Schedule of Major Categories of Receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Other income, net Other income, net Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Percent of EBITDA Line Of Credit Facility, Accordion Feature Percentage Of EBITDA The percentage of EBITDA for accordion feature under line of credit facility. Accrued and other current liabilities: Derivative Liability Financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Purchase price Preliminary purchase price (1) Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Receivables, net ($48,324 and $37,398 related to CCJVs) Total net receivables Receivables, Net, Current Variable Rate [Domain] Variable Rate [Domain] Total contract liabilities Contract liabilities Contract with Customer, Liability Distributions from unconsolidated construction joint ventures and affiliates Proceeds from Equity Method Investment, Distribution Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] General Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Preliminary purchase price Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) All Adjustments to Compensation All Adjustments to Compensation [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Amendment Flag Amendment Flag Unearned Revenue Unearned Revenue From Unsatisfied Performance Obligations [Text Block] Represents information related to unearned revenue from unsatisfied performance obligations. Termination Date Trading Arrangement Termination Date Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Contract assets, net Increase (Decrease) in Contract with Customer, Asset Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Net assets Net Assets Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Kenny Seng Construction Kenny Seng Construction [Member] Kenny Seng Construction Net tangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets, Net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets, Net Revenue since acquisition date Business Combination, Acquiree's Revenue since Acquisition Date, Actual Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Basic (shares) Weighted average common shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Cost of revenue Cost of revenue Cost of Product and Service Sold Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Related Party Transaction [Domain] Related Party Transaction [Domain] Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Amortization of debt issuance costs Amortization of Debt Issuance Costs Other (income) expense: Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number Valuation Technique, Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Revisions in Estimates, Decrease Revisions in Estimates, Decrease [Member] Represents information related to revisions in estimates. Equipment and vehicles Equipment and Vehicles [Member] Represents equipment and vehicles. Debt discount on 3.75% Convertible Notes conversion Debt Instrument, Unamortized Discount Corporate notes and bonds Corporate Notes And Bonds [Member] Corporate Notes And Bonds Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (USD per share) Common Stock, Par or Stated Value Per Share Common stock, issued (shares) Common Stock, Shares, Issued Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Note Exchange Settlement Note Exchange Settlement [Member] Note Exchange Settlement Other current assets: Derivative Asset, Current Total Shareholder Return Amount Total Shareholder Return Amount Foreign currency translation adjustments, net Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Insider Trading Arrangements [Line Items] Segment Reporting, Reconciling Item, Corporate Nonsegment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Nature of Expense [Domain] Interim Period, Costs Not Allocable [Domain] Long-term liabilities Liabilities, Noncurrent Total liabilities Liabilities Receivables, net Financing Receivables [Text Block] Line of credit borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity 3.25% Convertible Notes 3.25% Convertible Notes [Member] 3.25% Convertible Notes Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Other non-cash operating activities: Cash Flow, Other Noncash Operating Activities Disclosure [Abstract] Cash Flow, Other Noncash Operating Activities Disclosure Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Asset Class [Domain] Asset Class [Domain] Stock-based compensation expense and other (in shares) Stockholders' Equity, Other Shares Loss on derivative remeasurement Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Aggregates Aggregates [Member] Aggregates Statement [Line Items] Statement [Line Items] Debt Instrument, Redemption, Period Five Debt Instrument, Redemption, Period Five [Member] Consolidation Items [Axis] Consolidation Items [Axis] Variable Rate [Axis] Variable Rate [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Contributions to unconsolidated construction joint ventures Equity In Construction Joint Ventures Represents equity in construction joint venture. Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents ($154,537 and $145,584 related to consolidated construction joint ventures (“CCJVs”)) Cash and Cash Equivalent Municipal notes and bonds Municipal Notes And Bonds [Member] Municipal Notes And Bonds Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Construction Constructions [Member] Represents construction. Debt Instrument, Convertible, Threshold Trading Days Debt Instrument, Convertible, Threshold Trading Days Accrued And Unpaid Interest Accrued And Unpaid Interest [Member] Accrued And Unpaid Interest Common Stock Common Stock [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Equity Method Investment Summarized Balance Financial Information Equity Method Investment Summarized Balance Financial Information [Table Text Block] The tabular disclosure of summarized balance financial information for equity method investments. Non-NEOs Non-NEOs [Member] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation