Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Performance obligation time period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Weighted average interest rate Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Termination period Lessee, Lease, Termination Period Lessee, Lease, Termination Period Customer [Axis] Customer [Axis] Segment Reporting [Abstract] Common stock Common Stock, Value, Issued 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] City of Chicago City of Chicago [Member] City of Chicago Leases Lessee, Finance Leases [Text Block] Cost to complete bonded projects Guarantor Obligations, Maximum Exposure, Undiscounted Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date U.S. Gas U.S. Gas Segment [Member] U.S. Gas Segment Contract assets, total Contract assets, total Contract with Customer, Asset, after Allowance for Credit Loss 2027 Finance Lease, Liability, to be Paid, Year One Accrued insurance Accrued Insurance, Current 3.51%, due March 2027 Equipment Loans, 3.51%, Due March 2027 [Member] Equipment Loans, 3.51%, Due March 2027 Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current liabilities: Liabilities, Current [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Principal payments on finance lease liabilities Financing cash flows from finance leases Finance Lease, Principal Payments Leases [Abstract] Other comprehensive (loss) income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Related Parties Related Party Transactions Disclosure [Text Block] Income Tax Paid, by Individual Jurisdiction [Line Items] Income Tax Paid, by Individual Jurisdiction [Line Items] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Foreign currency translation adjustment Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Common stock, par value (in USD per share) Common Stock, Par or Stated Value Per Share Consolidated capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition Intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Weighted average basic shares outstanding (in shares) Weighted average shares outstanding for basic earnings per share attributable to common stock (in shares) Weighted Average Number of Shares Outstanding, Basic Share-Based Payment Arrangement, Tranche One Share-Based Payment Arrangement, Tranche One [Member] Contract assets Current contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Assets securing the facility Debt Instrument, Collateral Amount Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current 2030 Lessee, Operating Lease, Liability, to be Paid, Year Four Finance lease cost: Lease, Cost [Abstract] Entity Address, City or Town Entity Address, City or Town Master service agreements Master Service Agreement [Member] Master Service Agreement Schedule of Supplemental Disclosure of Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Accounts receivable securitization facility term Transfer Of Financial Assets Accounted For As Sales, Arrangement Term Transfer Of Financial Assets Accounted For As Sales, Arrangement Term Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Thereafter Finance Lease, Liability, To Be Paid, After Year Four Finance Lease, Liability, To Be Paid, After Year Four Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Canadian Overnight Repo Rate Average Canadian Overnight Repo Rate Average [Member] Canadian Overnight Repo Rate Average (CORRA) AR sold and derecognized Transfer of Financial Assets Accounted for as Sales, Amount Derecognized Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Maximum borrowing Line of Credit Facility, Maximum Borrowing Capacity Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Current portion of long-term debt Current portion of long-term debt Long-Term Debt, Current Maturities Number of financial banking institutions Number Of Financial Banking Institutions Number Of Financial Banking Institutions Subsequent Event Type [Axis] Subsequent Event Type [Axis] Members Of Management Of Riggs Distler & Company, Inc. Members Of Management Of Riggs Distler & Company, Inc. [Member] Members Of Management Of Riggs Distler & Company, Inc. Drum Parent LLC Drum Parent, LLC [Member] Drum Parent, LLC Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Accrued capital expenditures Capital Expenditures Incurred but Not yet Paid Grantee Status [Axis] Grantee Status [Axis] Interest coverage ratio Debt Instrument, Covenant, Interest Coverage Ratio, Minimum Debt Instrument, Covenant, Minimum Consolidated Interest Coverage Ratio Required Schedule of Segment Reporting Segment Reporting [Table Text Block] Gain on sale of equipment Gain (Loss) on Disposition of Property Plant Equipment Accrued acquisition consideration Noncash or Part Noncash Acquisition, Value of Liabilities Assumed Bid contracts Bid Contract [Member] Bid Contract Amortization of debt issuance costs Amortization of Debt Issuance Costs Related Party, Type [Axis] Related and Nonrelated Parties [Axis] Schedule of Accrued Expenses and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Performance target achieved Share-Based Compensation Arrangement by Share-Based Payment Award, Performance Achieved, Percent of Target Share-Based Compensation Arrangement by Share-Based Payment Award, Performance Achieved, Percent of Target Document Period End Date Document Period End Date Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Unrecognized tax benefits Unrecognized Tax Benefits Debt instrument, face amount Debt Instrument, Face Amount Restriction on dividend payments, amount Debt Instrument, Restriction On Dividend Payments, Amount Debt Instrument, Restriction On Dividend Payments, Amount Increase (Decrease) in contract asset Increase (Decrease) in Contract with Customer, Asset 2028 Lessee, Operating Lease, Liability, to be Paid, Year Two Security Exchange Name Security Exchange Name 3.27%, due March 2027 Equipment Loans, 3.27%, Due March 2027 [Member] Equipment Loans, 3.27%, Due March 2027 Fiscal Period Fiscal Period, Policy [Policy Text Block] Supplemental Cash Flow Disclosures Cash Flow, Supplemental Disclosures [Text Block] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Finance leases Finance Lease, Weighted Average Remaining Lease Term Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Current portion of operating lease liabilities Operating Lease, Liability, Current Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Right-of-use assets under finance leases Finance Lease, Right-of-Use Asset, after Accumulated Amortization Per Share Information Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Lease term, finance lease Lessee, Finance Lease, Remaining Lease Term Capital expenditures Payments to Acquire Property, Plant, and Equipment 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] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] 1.75%, due March 2027 Equipment Loans, 1.75%, Due March 2027, 1 [Member] Equipment Loans, 1.75%, Due March 2027, 1 Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Non-cash investing activities: Noncash Investing and Financing Items [Abstract] Special Purpose Entity Special Purpose Entity [Member] Special Purpose Entity Total long-term debt Long-Term Debt, Gross Other equipment loans Other Equipment Loans [Member] Other Equipment Loans Credit Facility [Domain] Credit Facility [Domain] Related Party Transactions [Abstract] Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average diluted shares outstanding (in shares) Weighted average shares outstanding for diluted earnings per share attributable to common stock (in shares) Weighted Average Number of Shares Outstanding, Diluted Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Related Party Transaction [Line Items] Related Party Transaction [Line Items] 2028 Finance Lease, Liability, to be Paid, Year Two Underlying Security Market Price Change Underlying Security Market Price Change, Percent 2030 Finance Lease, Liability, to be Paid, Year Four Deferred income taxes Deferred Income Taxes and Tax Credits Gross Profit Benchmark Gross Profit Benchmark [Member] Gross Profit Benchmark Award vesting rights, percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Less: Amount of lease payments representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Gross profit Consolidated gross profit Gross profit Gross Profit Revenue from Contract with Customer [Abstract] Weighted average dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Goodwill Goodwill [Text Block] Less: Amount of lease payments representing interest Finance Lease, Liability, Undiscounted Excess Amount Operating cash flows from operating leases Operating Lease, Payments Award Timing Predetermined Award Timing Predetermined [Flag] Intangible Asset, Goodwill and Other [Abstract] Surety backed letters of credit Letters of Credit Outstanding, Amount Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation activity APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Units eligible to be earned based on performance Share-Based Compensation Arrangement by Share-Based Payment Award, Awards Earned, Percent Share-Based Compensation Arrangement by Share-Based Payment Award, Awards Earned, Percent Schedule of Concentration Risk Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Consolidated effective income tax rate Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Grantee Status [Domain] Grantee Status [Domain] Total lease payments Lessee, Operating Lease, Liability, to be Paid Transfers and Servicing [Abstract] Secured Term Loan Facility Secured Term Loan Facility [Member] Secured Term Loan Facility Beginning balance (in USD per share) Ending balance (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Payment of line of credit borrowings Repayments of Long-Term Lines of Credit Employees Of Riggs Distler & Company, Inc. Employees Of Riggs Distler & Company, Inc. [Member] Employees Of Riggs Distler & Company, Inc. Fair value Long-Term Debt, Fair Value Redeemable noncontrolling interests Redeemable Noncontrolling Interest, Equity, Carrying Amount Depreciation Consolidated depreciation expense Depreciation Vesting [Domain] Vesting [Domain] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Dividend restriction (in percent) Debt Instrument, Covenant, Restriction On Dividend Payments, Percentage Of Adjusted, Rolling Twelve-Month Net Income Debt Instrument, Covenant, Restriction On Dividend Payments, Percentage Of Adjusted, Rolling Twelve-Month Net Income Right-of-use assets under operating leases Operating Lease, Right-of-Use Asset Concentration Risk Type [Domain] Concentration Risk Type [Domain] Schedule of Computation of Basic and Diluted Earnings (Loss) Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Information Segment Reporting [Text Block] Minimum Minimum [Member] Expiration Date Trading Arrangement Expiration Date Schedule of Revenue by Contract Type Disaggregation of Revenue [Table Text Block] Effects of foreign exchange translation Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Shares used in computing earnings (loss) per share: Weighted average shares: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Canadian Operations Canadian Gas Segment [Member] Canadian Gas Segment Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Operating Leases Lessee, Operating Lease, Liability, to be Paid, Rolling Maturity [Abstract] 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] Nonrelated Party Nonrelated Party [Member] Outstanding performance and payment bonds Loss Contingency, Estimate of Possible Loss Non-current liabilities Business Combination, Consideration Transferred, Liabilities Incurred Business Combination [Line Items] Business Combination [Line Items] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Percentage of ownership after sale of stock Sale of Stock, Percentage of Ownership after Transaction Common stock authorized (in shares) Common Stock, Shares Authorized Earnings (loss) per share attributable to common stock: Earnings Per Share Reconciliation [Abstract] Exercise Price Award Exercise Price Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Lease term, operating lease Lessee, Operating Lease, Remaining Lease Term Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Contract with customer revenue recognized related to unapproved change orders and claims Contract With Customer Revenue Recognized Related To Unapproved Change Orders And Claims Contract With Customer Revenue Recognized Related To Unapproved Change Orders And Claims 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] Segments [Domain] Segments [Domain] Accounts receivable Accounts Receivable, after Allowance for Credit Loss Non-current contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Debt issuance costs Debt Issuance Costs, Net Unamortized discount and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Equipment Loans Equipment Loan [Member] Equipment Loan Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Income Tax Paid, by Individual Jurisdiction [Table] Income Tax Paid, by Individual Jurisdiction [Table] Business Combination [Table] Business Combination [Table] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Thereafter Lessee, Operating Lease, Liability, To Be Paid, After Year Four Lessee, Operating Lease, Liability, To Be Paid, After Year Four Secured Debt Secured Debt [Member] Line of credit Long-Term Line of Credit, Noncurrent Billed on completed contracts and contracts in progress Accounts Receivable, before Allowance for Credit Loss, Current Adoption Date Trading Arrangement Adoption Date Finance leases Finance Lease, Weighted Average Discount Rate, Percent Purchase of equity method investment Payments to Acquire Equity Method Investments Counterparty Name [Domain] Counterparty Name [Domain] Debt instrument, stated percentage Debt Instrument, Interest Rate, Stated Percentage Total equity Beginning balance Ending balance Equity, Attributable to Parent ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total Operating Lease, Liability Insider Trading Policies and Procedures [Line Items] Total Finance Lease, Liability Goodwill, Measurement Period Adjustment Goodwill, Measurement Period Adjustment Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Other Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] PSUs Performance Shares [Member] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Selling, general and administrative expenses Selling, General and Administrative Expense 2.96%, due March 2027 Equipment Loans, 2.96%, Due March 2027 [Member] Equipment Loans, 2.96%, Due March 2027 Business Combination [Domain] Business Combination [Domain] Interest expense, net Interest Income (Expense), Nonoperating Letter of Credit Letter of Credit [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments RSUs Restricted Stock Units (RSUs) [Member] Goodwill Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key All Adjustments to Compensation All Adjustments to Compensation [Member] Other Other Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Debt Covenant Period One Debt Covenant Period One [Member] Debt Covenant Period One Business Combination [Axis] Business Combination [Axis] Equity: Equity [Abstract] 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] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accounts Receivable Accounts Receivable [Member] Noncontrolling interest revaluation Temporary Equity, Carrying Amount, Period Increase (Decrease) Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Ownership [Axis] Ownership [Axis] Finance lease liabilities, net of current portion Finance Lease, Liability, Noncurrent Accounts receivable, gross Accounts And Other Receivables, Gross, Current Accounts And Other Receivables, Gross, Current Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Applicable margins (in percent) Debt Instrument, Basis Spread on Variable Rate Book overdrafts Book Overdrafts, Current Book Overdrafts, Current City Area Code City Area Code Variable Rate [Domain] Variable Rate [Domain] Total lease payments Finance Lease, Liability, to be Paid Leverage ratio Debt Instrument, Covenant, Leverage Ratio Debt Instrument, Covenant, Leverage Ratio Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Geographic Concentration Risk Geographic Concentration Risk [Member] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Amortization of right-of-use assets Operating Lease, Right-of-Use Asset, Periodic Reduction Name Forgone Recovery, Individual Name Cost not yet recognized, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Weighted Average Grant Date Fair Value (Per Unit) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Statement [Line Items] Statement [Line Items] Total assets Assets Entity [Domain] Entity [Domain] New Term Loans New Term Loans [Member] New Term Loans Operating Segments Operating Segments [Member] Stock-based Compensation Share-Based Payment Arrangement [Text Block] Accounts Receivable and Contract Assets Benchmark Accounts Receivable And Contract Assets Benchmark [Member] Accounts Receivable And Contract Assets Benchmark PEO PEO [Member] Stock compensation expense Share-Based Payment Arrangement, Expense Other long-term liabilities Other Liabilities, Noncurrent Goodwill, net Goodwill, beginning balance Goodwill, ending balance Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Surety-Backed Letters Of Credit Surety-Backed Letters Of Credit [Member] Surety-Backed Letters Of Credit Debt Covenant Period Two Debt Covenant Period Two [Member] Debt Covenant Period Two Granted (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Revenue recognized Contract with Customer, Liability, Revenue Recognized Subsequent Event Type [Domain] Subsequent Event Type [Domain] Payables and Accruals [Abstract] Accumulated Deficit Retained Earnings [Member] Operating lease liabilities, net of current portion Operating Lease, Liability, Noncurrent Revolving Credit Facility Revolving Credit Facility [Member] Long-term debt, net of current portion Other Long-Term Debt, Noncurrent Forfeited (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted (in USD per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Southwest Gas Holdings Southwest Gas Holdings [Member] Southwest Gas Holdings Net cash (used in) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Changes in assets and liabilities, net of non-cash transactions Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Number of equipment loans Number Of Debt Instruments Number Of Debt Instruments Amortization of intangible assets Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Ownership [Domain] Ownership [Domain] PSUs converted to RSUs (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Converted in Period, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Converted in Period, Weighted Average Grant Date Fair Value Proceeds from line of credit borrowings Proceeds from Long-Term Lines of Credit Adjustments to reconcile net loss to net cash used in operating activities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Share-Based Payment Arrangement [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Total revenue Revenue reversal Consolidated revenue Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Unused letters of credit Line of Credit Facility, Remaining Borrowing Capacity Debt Covenant Period [Domain] Debt Covenant Period [Domain] Debt Covenant Period [Domain] Commitment fee for unused capacity, percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Canadian Operations Canadian Operations Segment [Member] Canadian Operations Segment Principal payments on long-term debt Repayments of Other Long-Term Debt Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive income attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Revenue and Related Balance Sheet Accounts Revenue from Contract with Customer [Text Block] Finance Leases Finance Lease, Liability, to be Paid, Rolling Maturity [Abstract] Operating leases Operating Lease, Weighted Average Discount Rate, Percent Segment Reporting [Table] Segment Reporting [Table] Net (loss) income Temporary Equity, Net Income Schedule of Related Party Transactions, by Related Party [Table] Related Party Transaction [Table] Schedule of Lease Expense Lease, Cost [Table Text Block] Accrued Expenses and Other Current Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Union Electric Union Electric Segment [Member] Union Electric Segment Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income Operating Income (Loss) Performance obligations Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Maturities of Finance Lease Liabilities Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Remainder of 2026 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Non-Union Electric Non-Union Electric Segment [Member] Non-Union Electric Segment Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Discount rate Line Of Credit Facility, Discount Rate, Percentage Line Of Credit Facility, Discount Rate, Percentage Increase (Decrease) in contract liability Increase (Decrease) In Contract With Customer, Liability, Month End Conversion Rate Increase (Decrease) In Contract With Customer, Liability, Month End Conversion Rate Leases not yet commenced Unrecorded Unconditional Purchase Obligation 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] Entity File Number Entity File Number Unused capacity Transfer Of Financial Assets Accounted For As Sales, Unused Capacity Transfer Of Financial Assets Accounted For As Sales, Unused Capacity Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Separate return method tax adjustment Adjustment To Additional Paid In Capital, Separate Return Method Tax Adjustment Adjustment To Additional Paid In Capital, Separate Return Method Tax Adjustment Stock-based compensation activity Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Common stock issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Number of contracts greater than one year Contract With Customer, Number Of Contracts, Greater Than One Year Contract With Customer, Number Of Contracts, Greater Than One Year Description of Business Business Description and Basis of Presentation [Text Block] Current contract assets included retention balances Contract with Customer, Asset, Retention Balance, Current Contract with Customer, Asset, Retention Balance, Current Unit-price contracts Unit-Priced Contract [Member] Unit-Priced Contract Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Related Party Related Party [Member] Income taxes paid, net of refunds Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] JJ White Inc. JJ White Inc. [Member] JJ White Inc. Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Current portion of finance lease liabilities Finance Lease, Liability, Current Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Noncontrolling interest revaluation Noncontrolling Interest, Change in Redemption Value Entity Small Business Entity Small Business Total comprehensive income (loss) attributable to common stock Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date PSUs converted to RSUs (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options,Converted in Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options,Converted in Period Subsequent Events [Abstract] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other assets Other Assets, Noncurrent 2029 Finance Lease, Liability, to be Paid, Year Three Document Type Document Type Acquisition of business, net of cash acquired Acquisition of business, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Non-cash loss on debt extinguishment Gain (Loss) on Extinguishment of Debt Accrued expenses and other current liabilities Accrued expenses and other current liabilities Accrued Liabilities, Current Fixed-price contracts Fixed-Price Contract [Member] Fair Value as of Grant Date Award Grant Date Fair Value Schedule of Goodwill [Table] Goodwill [Table] Connect Acquisition Connect Acquisition [Member] Connect Acquisition Temporary Equity: Redeemable Noncontrolling Interests Increase (Decrease) in Temporary Equity [Roll Forward] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Amount expected to be paid Business Combination, Consideration Transferred, Liabilities Incurred, Current Business Combination, Consideration Transferred, Liabilities Incurred, Current CANADA CANADA Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name 3.40%, due March 2027 Equipment Loans, 3.40%, Due March 2027 [Member] Equipment Loans, 3.40%, Due March 2027 Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 14) Commitments and Contingencies Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Amortization of ROU assets Finance Lease, Right-of-Use Asset, Amortization Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Counterparty Name [Axis] Counterparty Name [Axis] Total loan facility Secured Term Loan And Revolving Credit Facility Secured Term Loan And Revolving Credit Facility [Member] Secured Term Loan And Revolving Credit Facility Goodwill [Roll Forward] Goodwill [Roll Forward] LIABILITIES, TEMPORARY EQUITY AND EQUITY Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Interest on lease liabilities Finance Lease, Interest Expense Remainder of 2026 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Combined accounts receivable and contract assets Accounts Receivable And Contract With Customer, Asset, After Allowance For Credit Loss, Current Accounts Receivable And Contract With Customer, Asset, After Allowance For Credit Loss, Current Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] 1.75%, due March 2027 Equipment Loans, 1.75%, Due March 2027, 2 [Member] Equipment Loans, 1.75%, Due March 2027, 2 Percentage owned by noncontrolling owner Subsidiary, Ownership Percentage, Noncontrolling Owner PEO Name PEO Name Geographical [Axis] Geographical [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Weighted average discount rate: Weighted Average Discount Rate [Abstract] Weighted Average Discount Rate Total finance lease cost Finance Lease, Cost Finance Lease, Cost Other Commitments [Line Items] Other Commitments [Line Items] Existing Term Loans Existing Term Loans [Member] Existing Term Loans Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Cash, cash equivalents, and restricted cash, beginning of period Cash, cash equivalents, and restricted cash, end of period Cash, cash equivalents, and restricted cash in the condensed consolidated statements of cash flows Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Other accrued expenses Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Base Rate Base Rate [Member] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] 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] Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Non-cash stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Total lease cost Lease, Cost Performance and Payment Bond Performance And Payment Bond [Member] Performance And Payment Bond Customer [Domain] Customer [Domain] Leases Lessee, Operating Leases [Text Block] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in USD per share) Earnings Per Share, Basic Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Contract liabilities Contract liabilities Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt, net of current portion Long-Term Debt, Excluding Current Maturities Award Type Award Type [Axis] Short-term lease cost Short-Term Lease, Cost Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Restricted cash included in other assets Restricted Cash, Noncurrent Right-of-use assets obtained in exchange for lease obligations: Right-Of-Use Assets Obtained In Exchange For Lease Obligations [Abstract] Right-Of-Use Assets Obtained In Exchange For Lease Obligations 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] Beginning balance Ending balance Temporary Equity, Including Noncontrolling Interest Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Equity contribution - tax attributes Adjustment To Additional Paid In Capital, Equity Contribution-Tax Attributes Adjustment To Additional Paid In Capital, Equity Contribution-Tax Attributes Operating lease cost Operating Lease, Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Debt Covenant Period [Axis] Debt Covenant Period [Axis] Debt Covenant Period Concentration risk percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Effect of exchange rate changes Goodwill, Foreign Currency Translation, Gain (Loss) Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities, temporary equity and equity Liabilities and Equity Accrued compensation Accrued Salaries, Current Employee Stock Option Share-Based Payment Arrangement, Option [Member] Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party, Type [Domain] Related and Nonrelated Parties [Domain] Schedule of Accounts Receivable, Net Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Additional paid-in capital Additional Paid in Capital Other (income) expense, net Other Nonoperating Income (Expense) Long-Term Debt Long-Term Debt [Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name 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] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Accounts receivable, net Accounts receivable, net Accounts receivable, net Receivables, Net, Current Adjustment to Compensation: Adjustment to Compensation [Axis] Other receivables Other Receivables, Gross, Current Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Non-Union Electric Segment Customer Non-Union Electric Segment Customer [Member] Non-Union Electric Segment Customer Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Condensed consolidated balance sheets: Consolidated Balance Sheets [Abstract] Consolidated Balance Sheets Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Total cash consideration Business Combination, Consideration Transferred Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Weighted average remaining lease term (in years): Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term Name Trading Arrangement, Individual Name Cost not yet recognized, amount Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Cash and cash equivalents Cash and Cash Equivalent Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Schedule of Securitization or Asset-Backed Financing Arrangements, Financial Asset for which Transfer is Accounted as Sale [Table] Schedule of Securitization or Asset-Backed Financing Arrangements, Financial Asset for which Transfer is Accounted as Sale [Table] Entity Address, Address Line Two Entity Address, Address Line Two Stock-based compensation activity (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Net income (loss) Net income (loss) Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Net contract assets Contract With Customer, Asset (Liability), Net Contract With Customer, Asset (Liability), Net Current assets: Assets, Current [Abstract] Operating leases Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Vested (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Income tax expense (benefit) Income Tax Expense (Benefit) Customer Concentration Risk Customer Concentration Risk [Member] Total cost of revenue Consolidated cost of revenue Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Interim Condensed Consolidated Financial Information Consolidation, Policy [Policy Text Block] Net 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 Yield fees included in interest expense Transfer Of Financial Assets Accounted For As Sales, Yield Fees, Interest Expense Transfer Of Financial Assets Accounted For As Sales, Yield Fees, Interest Expense Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Amounts attributable to common stock: Net Income (Loss) Attributable to Parent [Abstract] Accounts Receivable Securitization Facility Transfers and Servicing of Financial Assets [Text Block] Time and materials contracts Time-and-Materials Contract [Member] Renewal term Lessee, Lease, Renewal Term Lessee, Lease, Renewal Term Share-Based Payment Arrangement, Tranche Three Share-Based Payment Arrangement, Tranche Three [Member] Net income (loss) attributable to common stock Net (loss) income Net income (loss) attributable to common stock Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Share-Based Payment Arrangement, Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Restatement Determination Date: Restatement Determination Date [Axis] Share-Based Payment Arrangement, Nonemployee Share-Based Payment Arrangement, Nonemployee [Member] Secured Revolving Credit Facility Secured Revolving Credit Facility [Member] Secured Revolving Credit Facility Cash proceeds from facility Transfer of Financial Assets Accounted for as Sales, Cash Proceeds Received for Assets Derecognized, Amount Schedule of Contract Asset and Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] Securitization or Asset-Backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items] Southwest Gas Corporation Southwest Gas Corporation [Member] Southwest Gas Corporation Temporary equity: Temporary Equity [Abstract] Cash paid for amounts included in the measurement of lease liabilities: Cash Paid For Amount Included In Measurement Of Lease Liabilities [Abstract] Cash Paid For Amount Included In Measurement Of Lease Liabilities Basis of Presentation and Recent Accounting Pronouncements Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]