Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum [Member] Maximum [Member] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [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 Contract asset impairment Contract with Customer, Asset, Credit Loss Expense (Reversal) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Estimated exposure, contracts with surety bonds, RPO percentage AggregateEstimatedExposureRPO1 Aggregate estimated exposure on contracts covered by surety bonds as a percentage of remaining performance obligations. Adjustment to Compensation, Amount Adjustment to Compensation Amount 2023 Credit Agreement Credit Agreement2023 [Member] Credit Agreement2023 Segment Reporting [Abstract] Segment Reporting [Abstract] High-Tech Manufacturing Market Sector [Member] HighTechManufacturingMarketSector [Member] High-Tech Manufacturing Market Sector [Member] Common stock, $0.01 par value, 200,000,000 shares authorized, 61,304,446 and 61,252,599 shares issued, respectively Common Stock, Value, Issued Excluding2026Acquisitions Excluding2026Acquisitions [Member] Excluding2026Acquisitions Taxes paid related to net share settlements of equity awards Payment, Tax Withholding, Share-Based Payment Arrangement Accrued payroll and benefits Employee-related Liabilities, Current Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Restatement Determination Date Restatement Determination Date Insurance liabilities, current Accrued Insurance, Current Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Allowance for credit losses (in US dollars) Allowance for credit losses Accounts Receivable, Allowance for Credit Loss Revenue From Contracts with Customers [Table] RevenueFromContractsWithCustomersTable [Table] RevenueFromContractsWithCustomersTable Contract Backlog Contract Backlog [Member] Contract Backlog Amendment Flag Amendment Flag Current liabilities: Liabilities, Current [Abstract] Provision for credit losses Provision for credit losses Accounts Receivable, Credit Loss Expense (Reversal) Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Repayments of finance lease liabilities Finance Lease, Principal Payments Percent of total segment revenues PercentageOfIndividualSegmentRevenues Percentage of total segment revenues. Letters of credit maximum borrowing capacity (in US dollars) Letters Of Credit Maximum Borrowing Capacity Letters of credit maximum borrowing capacity. Property, plant, and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Revenue From Contract With Customers [Line Items] RevenueFromContractWithCustomersLineItems [Line Items] RevenueFromContractWithCustomersLineItems Intangible Asset, Finite-Lived, Acquired [Line Items] Intangible Asset, Finite-Lived, Acquired [Line Items] Operating lease right-of-use assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRightOfUseAssets Amount of lessee's right to use underlying assets under operating leases, recognized as of the acquisition date. Insurance Liabilities Liability Reserve Estimate, Policy [Policy Text Block] Performance Obligation Satisfied In Previous Period PerformanceObligationSatisfiedInPreviousPeriod [Table Text Block] Tabular disclosure of amount of revenue from performance obligation satisfied or partially satisfied in previous reporting periods. Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Increase in contract liabilities from acquisitions Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Common stock, par value (in US dollars per share) Common Stock, Par or Stated Value Per Share Capital expenditures Segment Reporting, Long-Lived Asset, Expenditure for Addition Identifiable intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Operating lease liabilities, long-term BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLTOperatingLeaseLiabilities Present value of lessee's discounted obligation for lease payments from operating leases, classified as noncurrent, at the acquisition date. Share Repurchase Program [Domain] Share Repurchase Program [Domain] Weighted average shares outstanding used to compute basic earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Basic Contract assets Contract assets, current Contract with Customer, Asset, after Allowance for Credit Loss, Current Credit Agreement, 0% Base Rate RevolvingCreditFacility0BaseRate [Member] Revolving credit facility, 0% base rate Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Operating lease liabilities, current BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOperatingLeaseLiabilities Present value of lessee's discounted obligation for lease payments from operating leases, classified as current, at the acquisition date. Total current liabilities Liabilities, Current Performance obligation satisfied in previous period Contract with Customer, Performance Obligation Satisfied in Previous Period Work in process Inventory, Work in Process, Net of Reserves Customer Relationships Customer Relationships [Member] Revenues Revenues from unrelated entities Revenue from Contract with Customer, Including Assessed Tax Entity Address, City or Town Entity Address, City or Town Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] United States Industrial Services [Member] United States Industrial Services [Member] United States Industrial Services [Member] Denominator Denominator Earnings Per Share [Abstract] Denominator Earnings Per Share [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Schedule of Remaining Performance Obligations [Table] Schedule of Remaining Performance Obligations [Table] Schedule of Remaining Performance Obligations [Table] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Change in total estimated cost or anticipated contract value ContractWithCustomerCumulativeCatchUpAdjustmentChangeInMeasureOfProgress Reduction in profit recognized for cumulative catch-up adjustment from change in measure of progress. Aggregate estimated exposure, contracts with surety bonds Aggregate Estimated Exposure, Contracts with Surety Bonds Aggregate estimated exposure, assuming defaults on all our then existing contracts covered by surety bonds. Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Receivable [Domain] Receivable [Domain] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Indefinite-lived intangible assets acquired Intangible Asset, Indefinite-Lived, Acquired Line of credit facility maximum borrowing capacity (in US dollars) Line of Credit Facility, Maximum Borrowing Capacity Other comprehensive (loss) income Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Letter of credit fees Range Of Letter Of Credit Fees Range of letter of credit fees. UNITED STATES UNITED STATES Schedule of Remaining Performance Obligations [Line Items] Schedule of Remaining Performance Obligations [Line Items] [Line Items] for Schedule of Remaining Performance Obligations [Table] Transportation Market Sector [Member] TransportationMarketSector [Member] Transportation Market Sector [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Treasury stock, at cost 17,064,399 and 16,732,232 shares, respectively Treasury Stock, Value Other accrued expenses and liabilitites Business Combination, Recognized Liability Assumed, Other Liability, Current Financial Information by Reportable Segments Segment Reporting [Table Text Block] Noncontrolling Interests [Member] Noncontrolling Interest [Member] Post-retirement plans, tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Repayments of revolving credit facility Repayments of Lines of Credit Identifiable intangible assets acquired Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Document Period End Date Document Period End Date Commercial Site-Based Services [Member] CommercialSiteBasedServices [Member] Commercial Site-Based Services [Member] 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 income tax benefits Unrecognized Tax Benefits Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common Stock Equity [Text Block] Security Exchange Name Security Exchange Name Business acquisition, transaction costs Business Combination, Transaction Cost, Excluding Separately Recognized Transaction Excess tax benefits from share-based compensation Excess Tax Benefits From Share-Based Compensation Amount of realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. Contract assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractAssets Amount due in exchange for goods or services transferred to customers when right to consideration is conditioned on something other than passage of time, classified as current, acquired at the acquisition date. Additional Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Mechanical Services [Member] MechanicalServices [Member] Mechanical Services [Member] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Operating lease liabilities, current Operating Lease, Liability, Current Accounts Receivable, Allowance for Credit Losses Accounts Receivable, Allowance for Credit Loss [Table Text Block] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Earnings Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] 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] Cumulative Catch-Up Adjustment [Table] CumulativeCatchUpAdjustment [Table] Cumulative Catch-Up Adjustment [Table] Total liabilities Liabilities Trading Symbol Trading Symbol Net contract liabilities ContractLiabilitiesNet Net contract liabilities. Geographical [Domain] Geographical [Domain] Service Work [Member] ServiceWork [Member] Service Work [Member] 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] Institutional Market Sector [Member] InstitutionalMarketSector [Member] Institutional Market Sector [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Fair Values of Assets Acquired and Liabilities Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Working capital acquired Business Combination Recognized Working Capital The amount of consideration in a business combination allocated to working capital. Government Site-Based Services [Member] GovernmentSiteBasedServices [Member] Government Site-Based Services [Member] Credit Facility [Domain] Credit Facility [Domain] Cash flows - operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Shares used to compute diluted earnings per common share (in shares) Weighted Average Number of Shares Outstanding, Diluted Business acquisition, percentage acquired Business Combination, Voting Equity Interest Acquired, Percentage Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Credit Agreement Base Rate, Federal Funds Rate RevolvingCreditFacilityBaseRateFederalFundsRate [Member] Revolving credit facility base rate, federal funds rate. Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Proceeds from revolving credit facility Proceeds from Lines of Credit United States Building Services [Member] United States Building Services [Member] United States Building Services [Member] Increase in contract assets from acquisitions Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination Gross profit Gross Profit Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Credit Agreement Base Rate, Adjusted Term SOFR One Month Tenor Rate RevolvingCreditFacilityBaseRateAdjustedSOFROneMonthTenorRate [Member] Revolving credit facility base rate, Adjusted Term SOFR for a one-month tenor Business Combination, Intangible Asset, Acquired, Finite-Lived [Table] Business Combination, Intangible Asset, Acquired, Finite-Lived [Table] Award Timing Predetermined Award Timing Predetermined [Flag] Treasury Stock [Member] Treasury Stock, Common [Member] Letters of credit outstanding (in US dollars) Letters of Credit Outstanding, Amount Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Income tax rate Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Intangible Asset, Indefinite-Lived, Class [Domain] Intangible Asset, Indefinite-Lived, Class [Domain] Credit agreement, initiation date CreditAgreementInitiationDate1 Credit Agreement, Initiation Date Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Effect of dilutive securities-Share-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Water and Wastewater Market Sector [Member] WaterandWastewaterMarketSector [Member] Water and Wastewater Market Sector [Member] All Executive Categories All Executive Categories [Member] Surety bonds for insurance Surety Bonds for Insurance Amount of surety bonds utilized as collateral for insurance obligations. Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock, par value (in US dollars per share) Preferred Stock, Par or Stated Value Per Share United States Electrical Construction And Facilities Services [Member] United States Electrical Construction And Facilities Services [Member] United States electrical construction and facilities services. Depreciation and amortization Depreciation and amortization of property, plant, and equipment Depreciation Antidilutive Securities [Axis] Antidilutive Securities [Axis] Scenario [Domain] Scenario [Domain] Payments for contingent consideration arrangements Payments for Contingent Consideration Arrangements Payments for acquisition related contingent consideration arrangements. Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Calculation Of Basic And Diluted Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Numerator Numerator Earnings Per Share [Abstract] Numerator Earnings Per Share [Abstract] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Information Segment Reporting [Text Block] Minimum [Member] Minimum [Member] Dividends paid to stockholders Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Disaggregation of Revenues Disaggregation of Revenue [Table Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total equity Balance Balance Equity, Including Portion Attributable to Noncontrolling Interest 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] Healthcare Market Sector [Member] HealthcareMarketSector [Member] Healthcare Market Sector [Member] Business Combination [Line Items] Business Combination [Line Items] Common stock dividends Dividends, Common Stock Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, shares authorized Common Stock, Shares Authorized Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Accounts receivable Business Combination, Recognized Asset Acquired, Receivable, Current MillerElectric MillerElectric [Member] MillerElectric Deferred compensation plan assets Deferred Compensation Plan Assets Exercise Price Award Exercise Price Cash flows - investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Fair Value, Recurring [Member] Fair Value, Recurring [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Anticipated insurance recoveries, noncurrent Estimated Insurance Recoveries Stock repurchase, authorized amount (in US dollars) Share Repurchase Program, Authorized, Amount Net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill, Less Noncontrolling Interest Document Quarterly Report Document Quarterly Report 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] Cash, cash equivalents, and restricted cash at beginning of year (1) Cash, cash equivalents, and restricted cash at end of period (2) Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Effect of exchange rate changes on cash, cash equivalents, and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Debt Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Contract assets, non-current Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Insurance liabilities, noncurrent Accrued Insurance, Noncurrent Other long-term obligations BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentLiabilities Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer, assumed at the acquisition date. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Business Combination [Table] Business Combination [Table] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Borrowings under revolving credit facility (in US dollars) Long-Term Line of Credit, Noncurrent Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Adoption Date Trading Arrangement Adoption Date Total EMCOR Group, Inc. stockholders' equity Equity, Attributable to Parent Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent 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 Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Finance lease liabilities Finance Lease, Liability Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other Prepaid Expense and Other Assets, Current Deferred income taxes Deferred Income Tax Expense (Benefit) Selling, general and administrative expenses Selling, general and administrative expenses Selling, General and Administrative Expense Business Combination [Domain] Business Combination [Domain] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Anti-dilutive share-based awards excluded from calculation of diluted earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Entity Central Index Key Entity Central Index Key Capital surplus Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate, Non-Segment [Member] Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Business Combination [Axis] Business Combination [Axis] 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 provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Project Work [Member] Project Work [Member] Project Work [Member] Remaining performance obligations, percent Revenue, Remaining Performance Obligation, Percentage Income Statement [Abstract] Income Statement [Abstract] EMCOR Group, Inc. stockholders' equity: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Finance lease liabilities, long-term Finance Lease, Liability, Noncurrent Schedule of Income Tax Provision Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Intersegment Eliminations [Member] Intersegment Eliminations [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code Variable Rate [Domain] Variable Rate [Domain] Accumulated Other Comprehensive Loss [Member] AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total assets Total assets Assets Business Combination [Abstract] Business Combination [Abstract] Remaining Performance Obligations RevenueRemainingPerformanceObligation [Table Text Block] Tabular disclosure of remaining performance obligation. Cumulative Catch-Up Adjustment ContractWithCustomerCumulativeCatchUpAdjustmentChangeInMeasureOfProgress [Table Text Block] Tabular disclosure of reduction in profit recognized for cumulative catch-up adjustment from change in measure of progress. Preferred stock, shares issued Preferred Stock, Shares Issued New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Operating Segments [Member] Operating Segments [Member] Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability PEO PEO [Member] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Measurement Basis [Axis] Measurement Basis [Axis] Other long-term obligations Other Liabilities, Noncurrent Goodwill Goodwill Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Subsequent Event Type [Domain] Subsequent Event Type [Domain] Retained Earnings [Member] Retained Earnings [Member] Operating lease liabilities, long-term Operating Lease, Liability, Noncurrent Money Market Funds [Member] Money Market Funds [Member] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent United States Mechanical Construction And Facilities Services [Member] United States Mechanical Construction And Facilities Services [Member] United States mechanical construction and facilities services. Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Common stock, outstanding Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted earnings per common share (in US dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Adjusted Term SOFR AdjustedTermSOFR [Member] Rate equal to the secured overnight financing rate as administered by the Federal Reserve Bank of New York for the applicable tenor plus 0.10% Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Tax withholding for common stock issued under share-based compensation plans Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Changes in operating assets and liabilities, excluding the effect of businesses acquired Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Non-cash share-based compensation expense Non-cash share-based compensation expense The aggregate amount of noncash, equity-based employee and non-employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Amortization of identifiable intangible assets Intangible Asset, Finite-Lived, Amortization Expense Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Field Services [Member] FieldServices [Member] Field Services [Member] Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Amounts written off against the allowance, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Total assets acquired Business Combination, Recognized Asset Acquired, Asset Finite-lived intangible assets acquired Intangible Asset, Finite-Lived, Acquired Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] United Kingdom Building Services [Member] United Kingdom Building Services [Member] [Member] United Kingdom Building Services [Member] Cash flows - financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant, and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Commitment fee percentage of unused amount Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Surety Bond Surety Bond [Member] Inventories Inventory Disclosure [Text Block] Repurchases of common stock Stock repurchased (in US dollars) Stock Repurchased During Period, Value Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Noncontrolling interests Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Number of operating subsidiaries NumberOfOperatingSubsidiaries Number of operating subsidiaries Schedule of Segment Reporting Information [Table] Segment Reporting [Table] Other accrued expenses and liabilities Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Commitments and Contingencies Disclosure [Abstract] 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) Operating Income (Loss) Increase in borrowing capacity (in US dollars) Increase Borrowing Capacity Amount of increase in borrowing capacity if additional lenders are identified and/or existing lenders are willing to increase their current commitments. Other net assets Business Combination Recognized Other Net Assets The amount of consideration in a business combination allocated to other net assets. Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Acquisitions Of Businesses Business Combination [Text Block] Common stock, issued Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Number of shares repurchased Stock Repurchased During Period, Shares 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] Dividends declared per common share (in US dollars per share) Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued Common Stock, Shares, Issued Measure: Measure [Axis] Treasury stock, shares Treasury Stock, Common, Shares Performance Obligation Satisfied in Previous Period [Line Items] Performance Obligation Satisfied in Previous Period [Line Items] Performance Obligation Satisfied in Previous Period [Line Items] Equity Components [Axis] Equity Components [Axis] Product and Service [Domain] Product and Service [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Entity Interactive Data Current Entity Interactive Data Current Finance lease liabilities, current Finance Lease, Liability, Current Variable Rate [Axis] Variable Rate [Axis] Short-Duration Projects [Member] ShortDurationProjects [Member] Short Duration Projects [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Accrued payroll and benefits BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedPayrollAndBenefits Amount of accrued payroll and benefits due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. Entity Small Business Entity Small Business Cash paid for: Cash Paid For Abstract Cash Paid For [Abstract] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date 2026Acquisitions 2026Acquisitions [Member] 2026Acquisitions Finite-lived intangible assets acquired, estimated useful lives Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period Subsequent Events [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Dispositions of Businesses Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Federal income tax rate, percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Changes in post-retirement plans (1) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Contract liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedContractLiabilities Amount of obligation to transfer goods or services to customers for which consideration has been received or is receivable, classified as current, acquired at the acquisition date. Other accrued expenses and liabilities Other Liabilities, Current Other assets Other Assets, Noncurrent Document Type Document Type Payments for acquisitions of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired 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] Fair Value as of Grant Date Award Grant Date Fair Value Commercial Market Sector [Member] CommercialMarketSector [Member] Commercial market sector Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Remaining authorized repurchase amount (in US dollars) Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Contract liabilities, non-current Contract with Customer, Liability, Noncurrent Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Common stock dividends, accrued dividend shares DividendsCommonStock1 Amount of accrued dividend shares on outstanding share-based awards. Income before income taxes Income 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] Total revenues Revenues Other long-term obligations Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] 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] Receivable Type [Axis] Receivable Type [Axis] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Other Commitments [Table] Other Commitments [Table] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Trade Names Trade Names [Member] Schedule Of Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Fair Value Measurements Fair Value Disclosures [Text Block] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Geographical [Axis] Geographical [Axis] Net periodic pension income Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Income taxes Income Tax Paid, before Refund Received Interest income (expense), net Interest income (expense), net Interest Income (Expense), Operating and Nonoperating Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Other Commitments [Line Items] Other Commitments [Line Items] Revenue Recognition Revenue [Policy Text Block] Maxine L. Mauricio [Member] Maxine L. Mauricio Expiration date of credit agreement CreditAgreementExpirationDate1 Date the credit agreement expires. 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] Restricted cash Restricted Cash and Cash Equivalent, 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] Basis Of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Subsequent Event [Table] Subsequent Event [Table] Purchase price Payments to Acquire Businesses, Gross Interest rate description Line of Credit Facility, Interest Rate Description Accounts Receivable and Allowance for Credit Losses Credit Loss, Financial Instrument [Policy Text Block] Inventories Schedule of Inventory, Current [Table Text Block] Basic earnings per common share (in US dollars per share) Earnings Per Share, Basic Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Network and Communications Market Sector [Member] NetworkandCommunicationsMarketSector [Member] Network and Communications Market Sector Repurchases of common stock Payments for Repurchase of Common Stock Contract liabilities Contract liabilities, current Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, less allowance for credit losses of $25,008 and $22,757, respectively Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] 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] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock [Member] Common Stock [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] 2025AcquisitionsExcludingMiller 2025AcquisitionsExcludingMiller [Member] 2025AcquisitionsExcludingMiller Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Cover [Abstract] Manufacturing and Industrial Market Sector [Member] ManufacturingandIndustrialMarketSector [Member] Manufacturing and Industrial Market Sector [Member] UNITED KINGDOM UNITED KINGDOM Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Number of businesses acquired Business Combination, Number of Businesses Acquired Total liabilities and equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Performance Obligation Satisfied in Previous Period [Table] Performance Obligation Satisfied in Previous Period [Table] Performance Obligation Satisfied in Previous Period [Table] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Number of reportable segments not disclosed flag NumberOfReportableSegmentsNotDisclosedFlag Number Of Reportable Segments Not Disclosed Flag Business Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Cumulative Catch-Up Adjustment [Line Items] CumulativeCatchUpAdjustment [Line Items] Cumulative Catch-Up Adjustment [Line Items] Income Tax Authority [Domain] Income Tax Jurisdiction [Domain] Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Tabular List, Table Tabular List [Table Text Block] Name Awards Close in Time to MNPI Disclosures, Individual Name Equity: Equity, Including Portion Attributable to Noncontrolling Interest [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] Increase in net contract liabilities ContractNetLiabilitiesIncrease Amount of increase in net contract liabilities. Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, $0.10 par value, 1,000,000 shares authorized, zero issued and outstanding Preferred Stock, Value, Issued Hospitality and Entertainment Market Sector [Member] HospitalityandEntertainmentMarketSector [Member] Hospitality and Entertainment Market Sector [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest Interest Paid, Excluding Capitalized Interest, Operating Activity Purchases of property, plant, and equipment Payments to Acquire Productive Assets Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Total Assets, Fair Value Disclosure Income Tax Authority [Axis] Income Tax Jurisdiction [Axis] Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Acquisition of noncontrolling interests Noncontrolling Interest, Increase from Business Combination Other reconciling items Other Noncash Income (Expense) Fair Values of Identifiable Intangible Assets Acquired and Their Estimated Useful Lives ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTextBlock [Table Text Block] Tabular disclosure of finite-lived and indefinite-lived intangible assets acquired as part of a business combination or through an asset purchase, by major class and in total, including the value of the asset acquired, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period. Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Anticipated insurance recoveries, current EstimatedInsuranceRecoveriesCurrent Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of the insurance contracts. Represents the current amount receivable, that is amounts expected to be collected within one year. Capital Surplus [Member] Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Intangible Asset, Indefinite-Lived, Class [Axis] Intangible Asset, Indefinite-Lived, Class [Axis] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Raw materials and construction materials Inventory, Raw Materials, Net of Reserves Company Selected Measure Amount Company Selected Measure Amount Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] 2023 Revolving Credit Facility Revolving Credit Facility2023 [Member] Revolving Credit Facility2023 Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Shop Services [Member] ShopServices [Member] Shop Services [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income tax provision Income Tax Expense (Benefit) Cost of sales Cost of sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] New Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Net income (in US dollars) Net income Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Proceeds from sale or disposal of property, plant, and equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Inventories Inventories Inventory, Work in Process and Raw Materials, Net of Reserves Restatement Determination Date: Restatement Determination Date [Axis] Remaining Performance Obligations, Expected Timing of Satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Contract Assets and Contract Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Prepaid expenses and other Business Combination, Recognized Asset Acquired, Prepaid Expense and Other Asset, Current