Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Long-term finance and operating lease obligations Lease, Liability, Noncurrent Lease, Liability, Noncurrent Net contract assets (liabilities), Change Increase (Decrease) in Net Contract Assets Liabilities The amount of increase (decrease) in net contract assets (liabilities) during the year. Range [Domain] Statistical Measurement [Domain] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Contract retainages, net, Change Increase (Decrease) In Contract Receivable Retainage The increase (decrease) during the reporting period of the amount of contract receivable retainage. Award Timing Predetermined Award Timing Predetermined [Flag] Remainder of 2025 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Leases [Abstract] Notes payable to banks Notes Payable to Banks [Member] Unbilled revenue, net Unbilled revenue Unbilled Contracts Receivable Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Finance Lease Obligations Finance Lease, Liability [Abstract] Employees Employees [Member] Accounts payable Increase (Decrease) in Accounts Payable Contract assets, net of allowances of $537 and $422, respectively Contract assets, net Contract assets, net Contract with Customer, Asset, after Allowance for Credit Loss, Current Bonds outstanding Guarantor Obligations, Maximum Exposure, Undiscounted Shares repurchased related to tax withholding for stock-based compensation Shares repurchased related to tax withholding for stock-based compensation Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Insurance program obligations Insurance Program Obligations [Member] Insurance Program Obligations Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Percentage of capital stock from direct foreign subsidiaries Percentage of Capital Stock From Direct Foreign Subsidiaries Percentage of capital stock from direct foreign subsidiaries pledged as collateral for a debt. Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Revenue Recognition Revenue from Contract with Customer [Text Block] Other comprehensive income (loss) Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Schedule of segment's internal financial reports Schedule of Segment Reporting Information, by Segment [Table Text Block] Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Percentage of potential target shares awarded Share Based Compensation Arrangement By Share Based Payment Award Potential Payout As Percentage Of Target Shares The percentage of target shares, an employee can earn, under the plan. Adjustment to Compensation, Amount Adjustment to Compensation Amount Concentration risk, Percent Concentration Risk, Percentage Remaining performance obligation, percentage Revenue, Remaining Performance Obligation, Percentage Other assets Increase (Decrease) in Other Operating Assets Interim Consolidated Financial Information Consolidation, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense 2028 Finance Lease, Liability, to be Paid, Year Three Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Grantee Status [Domain] Grantee Status [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Insider Trading Policies and Procedures [Line Items] Contract Assets and Liabilities Long-Term Contracts or Programs Disclosure [Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Current assets: Assets, Current [Abstract] Total liabilities and shareholders’ equity Liabilities and Equity Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Cover [Abstract] Cover [Abstract] Maximum Maximum [Member] Schedule of future minimum operating lease payments Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Remainder of 2025 Lease, Liability, To Be Paid, Remainder of Fiscal Year Lease, Liability, To Be Paid, Remainder of Fiscal Year Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Net present value of minimum lease payments Operating Lease, Liability Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Income (loss) before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Other liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Deferred revenue, Change Increase (Decrease) in Deferred Revenue Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating Segments Operating Segments [Member] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Current portion of long-term debt Less: current portion of long-term debt Less: current portion of equipment notes Long-Term Debt, Current Maturities Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Name Measure Name Letter of credit Letter of Credit [Member] Secured debt Secured Debt [Member] Current portion of operating lease obligations Operating lease obligations Less: current portion of finance and operating lease obligations Operating Lease, Liability, Current Interest on lease liabilities Finance Lease, Interest Expense Deferred income tax liabilities Deferred Income Tax Liabilities, Net Document Fiscal Period Focus Document Fiscal Period Focus Organization Consolidation and Presentation of Financial Statements [Table] Organization Consolidation and Presentation of Financial Statements [Table] Award Timing Method Award Timing Method [Text Block] Award Type [Axis] Award Type [Axis] Total debt Long-Term Debt Increase (decrease) in consolidated gross margin Cost Estimate Revision Gross Margin Increase Decrease Percentage Percentage of increase (decrease) cost estimate revision gross margin. Total assets Identifiable assets Assets Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four Shares vested, weighted average grant date fair value (in dollars 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 Geographical [Domain] Geographical [Domain] Stock issued under compensation plans, net (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Weighted-average discount rate - finance leases Finance Lease, Weighted Average Discount Rate, Percent Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Concentration Risk Type [Axis] Concentration Risk Type [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount 2028 Lease, Liability, To Be Paid, Year Three Lease, Liability, To Be Paid, Year Three Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company 2028 Long-Term Debt, Maturity, Year Three 2026 Finance Lease, Liability, to be Paid, Year One Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Right-of-use asset obtained in exchange for new operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Weighted-average remaining lease term - finance leases Finance Lease, Weighted Average Remaining Lease Term Equipment Note 10 Equipment Note Ten [Member] Equipment Note Ten Lease cost: Lease, Cost [Abstract] Repayments under revolving lines of credit Repayments of Lines of Credit 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] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Electrical construction Market Type Electrical Construction [Member] Operating Lease Obligations Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Financing component Finance Lease, Liability, Undiscounted Excess Amount Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Plan Name [Axis] Plan Name [Axis] PEO PEO [Member] Schedule of revenue by contract and market type Disaggregation of Revenue [Table Text Block] Interest income Investment Income, Interest Total lease obligations Lease Obligation Total Represent the lease obligation, total. Accrued income taxes Accrued Income Taxes, Current Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [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] Retained Earnings Retained Earnings [Member] Total Lease Obligations Total Lease Obligations [Abstract] Total Lease Obligations Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Beginning of period End of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Income tax expense (benefit) Income Tax Expense (Benefit) Interest rate margin Debt Instrument, Basis Spread on Variable Rate Performance Guarantee Performance Guarantee [Member] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Intangible assets, net of accumulated amortization of $37,584 and $34,573, respectively Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Term of master service agreements Master Service Agreements, Term Term of master service agreements ("MSAs"), in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Cash paid for amounts included in the measurement of lease liabilities Cash Flow, Operating Activities, Lessee [Abstract] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Number of equipment notes (equipment note) Debt Instrument Number Of Debt Instruments The number of debt instruments. Property and equipment, accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of contract assets and liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Operating And Finance Leases [Line Items] Operating And Finance Leases [Line Items] n/a Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash flows provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Term (years) Debt instrument term Debt Instrument, Term Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Total lease cost Lease, Cost Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Schedule of lease costs Lease, Cost [Table Text Block] Receivable for insurance claims in excess of deductibles Increase (Decrease) in Insurance Settlements Receivable PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation and amortization of property and equipment Depreciation 2029 Lease, Liability, To Be Paid, Year Four Lease, Liability, To Be Paid, Year Four 2029 Finance Lease, Liability, to be Paid, Year Four Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Summary of the lease terms and discount rates Schedule Of Summary Of The Lease Terms And Discount Rates [Table Text Block] Schedule of summary of the lease terms and discount rates. Equity Components [Axis] Equity Components [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Number of business segments (segment) Number of business segments (segment) Number of Reportable Segments Assets Servicing Asset [Abstract] Organization, Business and Basis of Presentation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Other information: Supplemental Cash Flow Information [Abstract] Other Performance Measure, Amount Other Performance Measure, Amount Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Entity Address, State or Province Entity Address, State or Province Payment of principal obligations under finance leases Finance Lease, Principal Payments Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Total current liabilities Liabilities, Current Organization Consolidation and Presentation of Financial Statements [Line Items] Organization Consolidation and Presentation of Financial Statements [Line Items] Net Period [Axis] Net Period [Axis] Individual: Individual [Axis] Lease Obligations Lessee, Finance Leases [Text Block] Right-of-use asset obtained in exchange for new finance lease obligations Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Prepaid expenses and other current assets Other Assets, Current Additional paid-in capital Additional Paid in Capital, Common Stock Non-performance letters of credit Nonperformance Letters Of Credit [Member] Effect of Change in Accounting Estimate, Type [Axis] Effect of Change in Accounting Estimate, Type [Axis] Contract Performance Obligations Contract Performance Obligations [Member] Contract Performance Obligations Net cash flows used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Investment in joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Remaining performance obligation, term Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Document Fiscal Year Focus Document Fiscal Year Focus Master loan agreement Master Loan Agreement [Member] Master Loan Agreement [Member]. Time Vested Stock Awards Time Vested Stock Awards [Member] Time Vested Stock Awards Member Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Operating lease cost Operating Lease, Cost Plan Name [Domain] Plan Name [Domain] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Segment Information Segment Reporting Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Other Commitments [Line Items] Other Commitments [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] 2027 Finance Lease, Liability, to be Paid, Year Two Amortization of intangible assets Amortization of Intangible Assets Selling, general and administrative expenses Selling, General and Administrative Expense Deferred income taxes Deferred Income Tax Assets, Net Depreciation and amortization Depreciation, Depletion and Amortization Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Schedule of remaining principal payments for long term obligations Schedule of Maturities of Long-Term Debt [Table Text Block] 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] Total non-current obligations Lease Obligation Noncurrent Represent the lease obligation noncurrent. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fixed price Fixed-Price Contract [Member] Distribution Market Type Distribution [Member] Revolving loans Revolving Credit Facility [Member] Summary of supplemental cash flow information Schedule Of Lease Supplemental Cash Flow And Other Disclosures [Table Text Block] Tabular disclosure of lease supplemental cash flow and other disclosures. Net present value of minimum lease payments Finance Lease, Liability Total right-of-use lease assets Operating and Finance Lease Right of Use Asset Represent the operating and finance lease right-of-use asset. Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Revenue recognized, related to change orders and claims included as contract price adjustments Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price Contract liabilities Contract liabilities Contract liabilities Contract with Customer, Liability, Current Segments [Axis] Segments [Axis] Exercise Price Award Exercise Price Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Contingencies Excluding Wildfire and Health Insurance Contingencies Excluding Wildfire And Health Insurance [Member] Contingencies Excluding Wildfire and Health Insurance [Member] Share repurchases under share repurchase program (in shares) Shares repurchased related to tax withholding for stock-based compensation (in shares) Stock Repurchased and Retired During Period, Shares ASSETS Assets [Abstract] Long-term debt Long-term principal obligations Long-Term Debt, Excluding Current Maturities Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Unit price Unit Price Contract [Member] Fair Value Measurements Fair Value Disclosures [Text Block] Credit Facility [Domain] Credit Facility [Domain] Shareholders’ equity: Equity, Attributable to Parent [Abstract] 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] Current portion of accrued self-insurance Self Insurance Reserve, Current Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Debt instrument covenant leveraged debt ratio restriction Debt Instrument Covenant Leveraged Debt Ratio Restriction Threshold of debt coverage ration at which the credit agreement restricts certain types of payments. Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Stated Interest Rate (per annum) Debt Instrument, Interest Rate, Stated Percentage Accounts receivable, allowance Accounts Receivable, Allowance for Credit Loss, Current Shares repurchased related to tax withholding for stock-based compensation (in shares) Shares repurchased related to tax withholding for stock-based compensation (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Operating lease obligations, net of current maturities Operating lease obligations Operating Lease, Liability, Noncurrent 2017 Long-Term Incentive Plan 2017 Long-Term Incentive Plan [Member] Total minimum lease payments Lease, Liability, To Be Paid Lease, Liability, To Be Paid Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Credit agreement Credit Agreement [Member] Credit Agreement [Member]. Schedule of total debt Schedule of Long-Term Debt Instruments [Table Text Block] Shares granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Relationship to Entity [Domain] Title and Position [Domain] Document Quarterly Report Document Quarterly Report Deferred income taxes Deferred Income Taxes and Tax Credits Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Unbilled revenue, net, Change Revenue From Contract With Customer Increase (Decrease) In Unbilled Receivables The amount of contract with customer, increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts. Current portion of receivable for insurance claims in excess of deductibles Insurance Settlements Receivable, Current Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Shares granted, weighted average grant date fair value (in dollars 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 Related Party [Axis] Related and Nonrelated Parties [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Restatement Determination Date: Restatement Determination Date [Axis] Stock issued under compensation plans, net Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Non-PEO NEO Non-PEO NEO [Member] Letters of credit outstanding Letters of Credit Outstanding, Amount T&D Transmission And Distribution [Member] Other financing activities Proceeds from (Payment for) Other Financing Activity 2027 Lease, Liability, To Be Paid, Year Two Lease, Liability, To Be Paid, Year Two Deferred revenue Deferred revenue Contract With Customer Liability Excluding Provision For Loss On Contracts Current Its represent the contract with customer, liability excluding provision for loss on contracts, current. Name Trading Arrangement, Individual Name Equity Award [Domain] Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Other non-cash items Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] CANADA CANADA Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Revenues recognized during period Contract with Customer, Liability, Revenue Recognized Preferred Stock Preferred Stock [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Lease amortization period Lessee Operating Lease Amortization Period It represents Lessee Operating Lease Amortization Period. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Remainder of 2025 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Schedule of future minimum finance lease payments Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax 2026 Long-Term Debt, Maturity, Year One Liability Class [Axis] Liability Class [Axis] Segments [Domain] Segments [Domain] 2030 Long-Term Debt, Maturity, Year Five Performance Awards Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Schedule of amount of the remaining performance obligations that the company reasonably estimates will not be recognized within the next twelve months Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] C&I Commercial And Industrial [Member] Minimum Minimum [Member] Contracts Accounted for under Percentage of Completion Contracts Accounted for under Percentage of Completion [Member] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Payment of principal obligations under equipment notes Repayments of Notes Payable Company Selected Measure Name Company Selected Measure Name Short termination notice of master service agreements Master Service Agreements, Term of Short Termination Notice Short termination notice of master service agreements ("MSAs"), in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact Debt Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Operating cash flows from operating leases Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] All Executive Categories All Executive Categories [Member] Common stock—$0.01 par value per share; 100,000,000 authorized shares; 15,522,834 and 16,121,901 shares issued and outstanding at June 30, 2025 and December 31, 2024, respectively Common Stock, Value, Issued Finance lease right-of-use assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Employees Share-Based Payment Arrangement, Employee [Member] Title of Individual [Axis] Title and Position [Axis] Diluted (in shares) Weighted average common shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies Commitments and Contingencies Schedule of Contractors [Table] Schedule of Contractors [Table] n/a Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Summary of the lease-related assets and liabilities Schedule of Supplemental Balance Sheet Information Related to Leases [Table Text Block] Schedule of supplemental balance sheet information related to leases. Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Interest and penalties of unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Health Insurance Health Insurance [Member] Health Insurance [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report Net contract assets Net Contract Assets (Liabilities) The amount of net contract assets (liabilities) as at balance sheet period. Total minimum lease payments Finance Lease, Liability, to be Paid Preferred stock—$0.01 par value per share; 4,000,000 authorized shares; none issued and outstanding at June 30, 2025 and December 31, 2024 Preferred Stock, Value, Outstanding Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Income Taxes Income Tax Disclosure [Text Block] Estimated remaining costs for bonded projects Guarantor Obligations Expected Costs Its represents the guarantor obligations expected costs. Borrowings under revolving lines of credit Proceeds from Lines of Credit Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] T&E Te Contract [Member] Total shareholders’ equity Balance, beginning of period Balance, end of period Equity, Including Portion Attributable to Noncontrolling Interest Shares repurchased, weighted average price per share (in dollars per share) Shares Acquired, Average Cost Per Share Performance letters of credit Performance Letters Of Credit [Member] Document Type Document Type Schedule of assets allocation by segment Reconciliation of Assets from Segment to Consolidated [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] Cash and cash equivalents: Cash and Cash Equivalent [Abstract] Name Outstanding Recovery, Individual Name Contractors [Line Items] Contractors [Line Items] n/a Variable lease costs Variable Lease, Cost Contract revenues Contract revenues Revenue from Contract with Customer, Excluding Assessed Tax Service period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Effect of Change in Accounting Estimate, Type [Domain] Effect of Change in Accounting Estimate, Type [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Change Net Period Change [Member] Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Repurchase program authorized amount Share Repurchase Program, Authorized, Amount Commitment fee on unused capacity Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Payments related to tax withholding for stock-based compensation Payment, Tax Withholding, Share-Based Payment Arrangement Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Term Benchmark Rate Term Benchmark Rate [Member] Term Benchmark Rate Current liabilities: Current Liabilities, Current [Abstract] Geographical [Axis] Geographical [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Operating costs Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Debt outstanding under facility Long-Term Line of Credit Balance, beginning of period (in shares) Balance, end of period (in shares) Shares, Outstanding Foreign currency gains (losses) Gain (Loss), Foreign Currency Transaction, before Tax Diluted (in dollars per share) Increase (decrease) in diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net of allowances of $2,168 and $1,129, respectively Accounts Receivable, after Allowance for Credit Loss, Current Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Title of 12(b) Security Title of 12(b) Security Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Debt refinancing costs Payments of Debt Restructuring Costs Contract assets, allowance Allowance for doubtful accounts associated with contract assets Contract with Customer, Asset, Allowance for Credit Loss, Current Income (loss) per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Consolidation Items [Domain] Consolidation Items [Domain] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Option to extend lease term (up to) Lessee Operating and Finance Leases Option to Extend Term Lessee, operating and finance leases, option to extend, term. Other equipment note Other Equipment Note [Member] Other Equipment Note Gross profit Gross Profit Schedule of shared excluded from calculation of dilute securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Net present value of minimum lease payments Lease, Liability Lease, Liability Letters Of Credit, Discretional Letters Of Credit, Discretional [Member] Letters Of Credit, Discretional Share repurchases under share repurchase program Stock Repurchased and Retired During Period, Value Contract liabilities Contract liabilities, Change Increase (Decrease) in Contract with Customer, Liability Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Accrued loss provision Provision for Loss on Contracts Financing component Lessee, Operating Lease, Liability, Undiscounted Excess Amount Thereafter Finance Lease, Liability, to be Paid, after Year Five Schedule of net asset position for contracts in process Long-Term Contract or Program Disclosure [Table Text Block] Award Timing Disclosures [Line Items] Minimum lease payments required Total minimum lease payments Lessee, Operating Lease, Liability, to be Paid Subsidiaries Subsidiaries [Member] Property and equipment, net of accumulated depreciation of $402,519 and $387,223, respectively Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Net income (loss) Net income (loss) Increase (decrease) in net income Net Income (Loss) Attributable to Parent Total current obligations Lease Obligation Current Represents the lease obligation, current Expiration Date Trading Arrangement Expiration Date Non-current Liabilities, Noncurrent [Abstract] Other liabilities Increase (Decrease) in Other Operating Liabilities Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Numerator: Net Income (Loss) Attributable to Parent [Abstract] Financing component Lease, Liability, Undiscounted Excess Amount Lease, Liability, Undiscounted Excess Amount Less: billings to date Billings To Date Represents the billings to date on uncompleted contracts accounted for under the percentage-of-completion method. Repurchase of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Base Rate Base Rate [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable, net Increase (Decrease) in Accounts Receivable Entity Current Reporting Status Entity Current Reporting Status Contract retainages, net Construction Contractor, Receivable, Retainage Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Income (loss) from operations Increase (decrease) in operating income Income from operations Operating Income (Loss) Retained earnings Retained Earnings (Accumulated Deficit) Accrued self-insurance Self Insurance Reserve, Noncurrent Swingline Loan Swingline Loan [Member] Swingline Loan Gain on sale of property and equipment Gain on sale of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Insurance coverage deductible Loss Contingency Insurance Policy Deductible amount of Deductible Insurance Policy for Loss Contingency Current portion of finance lease obligations Finance lease obligations Current portion of finance lease obligations Finance Lease, Liability, Current Interest expense Interest Expense, Operating and Nonoperating Current Fiscal Year End Date Current Fiscal Year End Date Contract liabilities, Change Increase (Decrease) in Payables to Customers 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] Transmission Market Type Transmission [Member] Statement [Table] Statement [Table] Other expense, net Other Nonoperating Income (Expense) Net Period [Domain] Net Period [Domain] Adjustments to reconcile net income to net cash flows provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Revenue benchmark Revenue Benchmark [Member] Variable Rate [Domain] Variable Rate [Domain] Finance lease obligations, net of current maturities Finance lease obligations Finance Lease, Liability, Noncurrent Unrecognized tax benefits Unrecognized Tax Benefits Accrued self-insurance Increase (Decrease) in Self Insurance Reserve Antidilutive securities excluded from computation of earnings (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted average number of common shares and potential common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Schedule of Operating And Finance Leases, Disclosure [Table] Schedule of Operating And Finance Leases, Disclosure [Table] n/a All Adjustments to Compensation All Adjustments to Compensation [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Amendment Flag Amendment Flag 2027 Long-Term Debt, Maturity, Year Two Other Commitments [Table] Other Commitments [Table] Deferred debt issuance costs Debt Issuance Costs, Line of Credit Arrangements, Net Lease Obligations Lessee, Operating Leases [Text Block] Termination Date Trading Arrangement Termination Date Net cash flows used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Contract assets, net Changes in contract assets, net, Change Contract assets, net, Change Increase (Decrease) in Contract with Customer, Asset Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Net asset position for contracts in process Net Costs And Estimated Earnings In Excess Of Billings Represents the net costs and estimated earnings in excess of billings on uncompleted contracts accounted for under the percentage-of-completion method. Measure: Measure [Axis] Remaining lease term Lessee Operating and Finance Leases Remaining Contract Term Lessee operating and finance leases remaining contract term. Weighted-average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Basic (in shares) Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Contract costs Cost of Product and Service Sold Schedule of weighted average number of common shares used to compute basic and dilute earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Schedule of depreciation and amortization by segment Schedule Of Segment Reporting Information Related To Allocation Of Depreciation And Amortization By Segment [Table Text Block] Schedule Of Segment Reporting Information Related To Allocation Of Depreciation And Amortization By Segment Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Operating lease expense Operating Lease, Expense Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other income (expense): Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number Non-employee Directors Share-Based Payment Arrangement, Nonemployee [Member] Grantee Status [Axis] Grantee Status [Axis] Leverage coverage ratio Leverage Coverage Ratio The Company has the option to expand the debt coverage ratio in the event of an acquisition. 2026 Lease, Liability, To Be Paid, One Year Lease, Liability, To Be Paid, One Year Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Refundable income taxes Income Taxes Receivable, Current 2029 Long-Term Debt, Maturity, Year Four Weighted-average remaining lease term - operating leases Operating Lease, Weighted Average Remaining Lease Term Receivable for insurance claims in excess of deductibles Insurance Settlements Receivable, Noncurrent Use of Estimates Use of Estimates, Policy [Policy Text Block] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Less: current portion of finance and operating lease obligations Lease, Liability, Current Lease, Liability, Current Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Interest coverage ratio Debt Instrument Covenant Interest Coverage Ratio Represent the minimum interest coverage ratio under the credit agreement. 2030 Lease, Liability, To Be Paid, Year Five Lease, Liability, To Be Paid, Year Five Insider Trading Arrangements [Line Items] Corporate, Non-Segment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Security Exchange Name Security Exchange Name Thereafter Lease, Liability, To Be Paid, After Year Five Lease, Liability, To Be Paid, After Year Five Remainder of 2025 Long-Term Debt, Maturity, Remainder of Fiscal Year Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Letter of credit facility commitment percentage Line of Credit Facility, Commitment Fee Percentage Product concentration risk Product Concentration Risk [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity 2030 Finance Lease, Liability, to be Paid, Year Five Costs and estimated earnings on uncompleted contracts Aggregate Costs Incurred On Uncompleted Contracts And Estimated Earnings Represents the aggregate of costs incurred on uncompleted contracts and estimated earnings. Purchase orders outstanding Purchase Commitment, Remaining Minimum Amount Committed Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Other current liabilities Other Liabilities, Current Option to increase borrowing capacity Line Of Credit Facility Option To Increase Maximum Borrowing Capacity Represents the option to increase maximum borrowings on the credit facility. Weighted average interest rate Line of Credit Facility, Interest Rate During Period Statement [Line Items] Statement [Line Items] Consolidation Items [Axis] Consolidation Items [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Common Stock Common Stock [Member] Shares vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Accrued loss provision, Change Increase Decrease In Accrued loss provision The increase (decrease) during the reporting period of the amount of accrued loss provision. Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Weighted average dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Option to terminate leases, period Lessee Operating and Finance Leases Option to Terminate Period Lessee, operating and finance leases, option to terminate, period.