Business Acquisition [Axis] Business Acquisition [Axis] 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. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Minimum lease payments required Total minimum lease payments Lessee, Operating Lease, Liability, to be Paid Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Contract retainages, net, Change Increase (Decrease) In Contract Receivable Retainage The increase (decrease) during the reporting period of the amount of contract receivable retainage. Entity Address, Postal Zip Code Entity Address, Postal Zip Code Finance lease right-of-use assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding 2025 Long-Term Debt, Maturity, Year Two Debt Instrument [Axis] Debt Instrument [Axis] Net present value of minimum lease payments Finance Lease, Liability Employees Employees [Member] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Insurance program obligations Insurance Program Obligations [Member] Insurance Program Obligations Assets Servicing Asset [Abstract] 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. Contract liabilities, Change Increase (Decrease) in Payables to Customers Interest rate margin Debt Instrument, Basis Spread on Variable Rate 2027 Finance Lease, Liability, to be Paid, Year Four Range [Domain] Statistical Measurement [Domain] Depreciation and amortization of property and equipment Depreciation Shares exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Stated Interest Rate (per annum) Debt Instrument, Interest Rate, Stated Percentage Weighted-average discount rate - operating leases Operating Lease, Weighted Average Discount Rate, Percent Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] 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. Additional paid-in capital Additional Paid in Capital, Common Stock Revolving loans and letters of credit Revolving Loans And Letters Of Credit [Member] Revolving Loans And Letters Of Credit Other non-cash items Other Noncash Income (Expense) Property and equipment, net of accumulated depreciation of $356,613 and $351,753, respectively Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] 2026 Finance Lease, Liability, to be Paid, Year Three Increase (decrease) in net income Net income Net Income (Loss) Attributable to Parent Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Contingent Consideration by Type [Axis] Contingent Consideration by Type [Axis] Lease Obligations Lessee, Finance Leases [Text Block] Remainder of 2023 Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Schedule of remaining principal payments for long term obligations Schedule of Maturities of Long-Term Debt [Table Text Block] Operating Lease Obligations Lessee, Operating Lease, Liability, to be Paid [Abstract] Number of equity compensation plans (plan) Number Of Equity Stock Based Compensation Plans Represents the number of equity stock based compensation plans. Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Equity Component [Domain] Equity Component [Domain] Secured debt Secured Debt [Member] Lease Obligations Lessee, Operating Leases [Text Block] Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Related Party [Domain] Related Party [Domain] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Plan Name [Axis] Plan Name [Axis] Schedule of net asset position for contracts in process Long-Term Contract or Program Disclosure [Table Text Block] Remainder of 2023 Lease, Liability, To Be Paid, Remainder of Fiscal Year Lease, Liability, To Be Paid, Remainder of Fiscal Year Other information: Supplemental Cash Flow Information [Abstract] Plan Name [Domain] Plan Name [Domain] Remainder of 2023 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Debt outstanding under facility Long-Term Line of Credit Entity Address, State or Province Entity Address, State or Province Award Type [Axis] Award Type [Axis] Denominator: Weighted Average Number of Shares Outstanding, Basic [Abstract] Contingent Consideration Type [Domain] Contingent Consideration Type [Domain] Net cash flows provided by operating activities Net Cash Provided by (Used in) Operating Activities Current portion of operating lease obligations Operating lease obligations Less: current portion of finance and operating lease obligations Operating Lease, Liability, Current Share expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Cash paid for amounts included in the measurement of lease liabilities Cash Flow, Operating Activities, Lessee [Abstract] Lease cost: Lease, Cost [Abstract] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Contract Assets and Liabilities Long-Term Contracts or Programs Disclosure [Text Block] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Liability Class [Axis] Liability Class [Axis] Weighted average interest rate Line of Credit Facility, Interest Rate During Period Long-term debt Long-term principal obligations Long-Term Debt, Excluding Current Maturities Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Subsidiaries Subsidiaries [Member] Organization Consolidation and Presentation of Financial Statements [Table] Organization Consolidation and Presentation of Financial Statements [Table] Total liabilities Liabilities Weighted-average remaining lease term - operating leases Operating Lease, Weighted Average Remaining Lease Term Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Increase (decrease) in consolidated gross margin Cost Estimate Revision Gross Margin Increase Decrease Percentage Percentage of increase (decrease) cost estimate revision gross margin. Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Revolving loans Revolving Credit Facility [Member] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Document Type Document Type Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Segments [Axis] Segments [Axis] Debt Debt Disclosure [Text Block] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract] Entity Shell Company Entity Shell Company 2026 Lease, Liability, To Be Paid, Year Three Lease, Liability, To Be Paid, Year Three Deferred revenue, Change Increase (Decrease) in Deferred Revenue 2024 Lessee, Operating Lease, Liability, to be Paid, Year One Equipment Note 10 Equipment Note Ten [Member] Equipment Note Ten 2026 Long-Term Debt, Maturity, Year Three Consolidation Items [Domain] Consolidation Items [Domain] Revenue benchmark Revenue Benchmark [Member] Schedule of contract assets and liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Document Period End Date Document Period End Date Electrical construction Market Type Electrical Construction [Member] Certain Performance Targets Certain Performance Targets [Member] Certain Performance Targets Receivable for insurance claims in excess of deductibles Increase (Decrease) in Insurance Settlements Receivable Total assets Assets Debt Disclosure [Abstract] Debt Disclosure [Abstract] Income per common share: Earnings Per Share [Abstract] Earnings Per Share [Abstract] Equipment Note 8 Equipment Note Eight [Member] Represents the information pertaining to equipment Note 8. Total lease obligations Lease Obligation Total Represent the lease obligation, total. Antidilutive Securities [Axis] Antidilutive Securities [Axis] Performance Awards Performance Shares [Member] Current portion of receivable for insurance claims in excess of deductibles Insurance Settlements Receivable, Current Current portion of long-term debt Less: current portion of long-term debt Less: current portion of equipment notes Long-Term Debt, Current Maturities Shares exercised, weighted average exercise price (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 2028 Lessee, Operating Lease, Liability, to be Paid, Year Five Net cash flows provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Repurchase program authorized amount Stock Repurchase Program, Authorized Amount Total Lease Obligations Total Lease Obligations [Abstract] Total Lease Obligations Variable lease costs Variable Lease, Cost Income before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Segments [Domain] Segments [Domain] Deferred income taxes Deferred Income Taxes and Tax Credits Earnings Per Share Earnings Per Share [Text Block] Finance lease obligations, net of current maturities Finance Lease, Liability, Noncurrent Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Equity Award [Domain] Award Type [Domain] Grantee Status [Axis] Grantee Status [Axis] 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. Refundable income taxes Income Taxes Receivable, Current Gross profit Gross Profit Entity Registrant Name Entity Registrant Name Number of equipment notes (equipment note) Debt Instrument Number Of Debt Instruments The number of debt instruments. Entity Address, City or Town Entity Address, City or Town Operating And Finance Leases [Line Items] Operating And Finance Leases [Line Items] n/a Leases [Abstract] Leases [Abstract] Total shareholders’ equity Balance, beginning of period Balance, end of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Employees Share-Based Payment Arrangement, Employee [Member] Interim Consolidated Financial Information Consolidation, Policy [Policy Text Block] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Minimum Minimum [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] 2027 Lease, Liability, To Be Paid, Year Four Lease, Liability, To Be Paid, Year Four Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Fair Value Measurements Fair Value Disclosures [Text Block] 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. Trading Symbol Trading Symbol Entity File Number Entity File Number Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Title of Individual [Axis] Title of Individual [Axis] Shares granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Effective tax rate Effective Income Tax Rate Reconciliation, Percent Borrowings under revolving lines of credit Proceeds from Lines of Credit Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Use of Estimates Use of Estimates, Policy [Policy Text Block] Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Organization Consolidation and Presentation of Financial Statements [Line Items] Organization Consolidation and Presentation of Financial Statements [Line Items] Accounts payable Increase (Decrease) in Accounts Payable London Interbank Offered Rate (LIBOR) London Interbank Offered Rate (LIBOR) [Member] Net Period [Axis] Net Period [Axis] Concentration risk, Percent Concentration Risk, Percentage Income Taxes Income Tax Disclosure [Text Block] Non-performance letters of credit Nonperformance Letters Of Credit [Member] Credit Facility [Domain] Credit Facility [Domain] Amortization of intangible assets Amortization of Intangible Assets Preferred stock—$0.01 par value per share; 4,000,000 authorized shares; none issued and outstanding at March 31, 2023 and December 31, 2022 Preferred Stock, Value, Outstanding Master loan agreement Master Loan Agreement [Member] Master Loan Agreement [Member]. Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Time Vested Stock Awards Time Vested Stock Awards [Member] Time Vested Stock Awards Member Service period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period 2026 Lessee, Operating Lease, Liability, to be Paid, Year Three Corporate, Non-Segment Corporate, Non-Segment [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Accrued loss provision Provision for Loss on Contracts 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] Entity Interactive Data Current Entity Interactive Data Current Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Changes in operating assets and liabilities, net of acquisition: Increase (Decrease) in Operating Capital [Abstract] Numerator: Net Income (Loss) Attributable to Parent [Abstract] 2028 Long-Term Debt, Maturity, Year Five Retained Earnings Retained Earnings [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] 2028 Finance Lease, Liability, to be Paid, Year Five Total lease cost Lease, Cost Common Stock Common Stock [Member] Stock issued under compensation plans, net Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Number of business segments (segment) Number of business segments (segment) Number of Reportable Segments Schedule of lease costs Lease, Cost [Table Text Block] Contingent earn-out consideration Business Combination, Contingent Consideration, Liability Statement [Table] Statement [Table] 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 Total non-current obligations Lease Obligation Noncurrent Represent the lease obligation noncurrent. Document Quarterly Report Document Quarterly Report Letter of credit Letter of Credit [Member] Distribution Market Type Distribution [Member] Current assets: Assets, Current [Abstract] Interest and penalties of unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 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. Operating lease obligations, net of current maturities Operating lease obligations Operating Lease, Liability, Noncurrent Total right-of-use lease assets Operating and Finance Lease Right of Use Asset Represent the operating and finance lease right-of-use asset. Statistical Measurement [Axis] Statistical Measurement [Axis] Receivable for insurance claims in excess of deductibles Insurance Settlements Receivable, Noncurrent Grantee Status [Domain] Grantee Status [Domain] Retained earnings Retained Earnings (Accumulated Deficit) Accounts receivable, net of allowances of $2,008 and $2,073, respectively Accounts Receivable, after Allowance for Credit Loss, Current Equity Components [Axis] Equity Components [Axis] Contingencies Excluding Wildfire and Health Insurance Contingencies Excluding Wildfire And Health Insurance [Member] Contingencies Excluding Wildfire and Health Insurance [Member] Document Fiscal Year Focus Document Fiscal Year Focus Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Statement [Line Items] Statement [Line Items] Payment of principal obligations under finance leases Finance Lease, Principal Payments Unit price Unit Price Contract [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Variable Rate [Domain] Variable Rate [Domain] Selling, general and administrative expenses Selling, General and Administrative Expense Change in contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 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. Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] 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 Document Transition Report Document Transition Report Local Phone Number Local Phone Number Income from operations Increase (decrease) in operating income Income from operations: Operating Income (Loss) Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Credit agreement Credit Agreement [Member] Credit Agreement [Member]. Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Investment in joint ventures Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Goodwill Goodwill Shares repurchased (in shares) Stock Repurchased During Period, Shares Adjustments to reconcile net income to net cash flows provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Income tax expense Income Tax Expense (Benefit) Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Deferred income tax liabilities Deferred Income Tax Liabilities, Net Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share 2027 Lessee, Operating Lease, Liability, to be Paid, Year Four 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. Income Statement [Abstract] Income Statement [Abstract] Additional Paid-In Capital Additional Paid-in Capital [Member] Document Fiscal Period Focus Document Fiscal Period Focus Contract costs Cost of Goods and Services Sold Diluted (in shares) Weighted average common shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Deferred debt issuance costs Debt Issuance Costs, Line of Credit Arrangements, Net Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] T&D Transmission And Distribution [Member] Base Rate Base Rate [Member] 2025 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. Common stock—$0.01 par value per share; 100,000,000 authorized shares; 16,699,201 and 16,563,767 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively Common Stock, Value, Issued Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Preferred Stock Preferred Stock [Member] 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 Schedule of shared excluded from calculation of dilute securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Operating Segments Operating Segments [Member] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Product concentration risk Product Concentration Risk [Member] Beginning of period End of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Lease amortization period Lessee Operating Lease Amortization Period It represents Lessee Operating Lease Amortization Period. Current liabilities: Current Liabilities, Current [Abstract] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Common stock, shares issued (in shares) Common Stock, Shares, Issued Current portion of accrued self-insurance Self Insurance Reserve, Current Contract liabilities Contract liabilities Contract liabilities Contract with Customer, Liability, Current Interest on lease liabilities Finance Lease, Interest Expense Foreign currency gains (losses) Foreign Currency Transaction Gain (Loss), before Tax Current portion of finance lease obligations Finance lease obligations Current portion of finance lease obligations Finance Lease, Liability, Current Amendment Flag Amendment Flag Net cash flows used in investing activities Net Cash Provided by (Used in) Investing Activities Operating lease cost Operating Lease, Cost Contract retainages, net Construction Contractor, Receivable, Retainage Finance Lease Obligations Finance Lease, Liability [Abstract] Other comprehensive income Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax C&I Commercial And Industrial [Member] Schedule of segment's internal financial reports Schedule of Segment Reporting Information, by Segment [Table Text Block] Entity Current Reporting Status Entity Current Reporting Status Other current liabilities Other Liabilities, Current Other assets Other Assets, Noncurrent Powerline Plus Companies Powerline Plus Companies [Member] Powerline Plus Companies 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 2024 Finance Lease, Liability, to be Paid, Year One Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Commitment fee on unused capacity Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Payment of principal obligations under equipment notes Repayments of Notes Payable Federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Schedule of Contractors [Table] Schedule of Contractors [Table] n/a Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 2025 Finance Lease, Liability, to be Paid, Year Two 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. Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities Liabilities [Abstract] Operating cash flows from operating leases Operating Lease, Payments Health Insurance Health Insurance [Member] Health Insurance [Member] Stock Options Share-Based Payment Arrangement, Option [Member] Contingent earn-out consideration payment Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Relationship to Entity [Domain] Title of Individual [Domain] Net contract assets Net Contract Assets (Liabilities) The amount of net contract assets (liabilities) as at balance sheet period. Accounts receivable, allowance Accounts Receivable, Allowance for Credit Loss, Current Fixed price Fixed-Price Contract [Member] Total future principal payments Long-Term Debt Other expense, net Other Nonoperating Income (Expense) Organization, Business and Basis of Presentation Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Performance Guarantee Performance Guarantee [Member] Maximum Maximum [Member] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Estimated remaining costs for bonded projects Guarantor Obligations Expected Costs Its represents the guarantor obligations expected costs. Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Shares repurchased related to tax withholding for stock-based compensation Stock Repurchased and Retired During Period, Value Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Contract liabilities Contract liabilities, Change Increase (Decrease) in Contract with Customer, Liability Total current assets Assets, Current T&E Te Contract [Member] Revenues recognized during period Contract with Customer, Liability, Revenue Recognized Business Acquisition [Line Items] Business Acquisition [Line Items] Entity Small Business Entity Small Business Performance letters of credit Performance Letters Of Credit [Member] Other Commitments [Table] Other Commitments [Table] Balance, beginning of period (in shares) Balance, end of period (in shares) Shares, Outstanding Contractors [Line Items] Contractors [Line Items] n/a Remaining performance obligation, term Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Change Net Period Change [Member] Shares repurchased related to tax withholding for stock-based compensation (in shares) Shares repurchased related to tax withholding for stock-based compensation (in shares) Stock Repurchased and Retired During Period, Shares Accounts receivable, net Increase (Decrease) in Accounts Receivable Title of 12(b) Security Title of 12(b) Security Repayments under revolving lines of credit Repayments of Lines of Credit Debt Instrument [Line Items] Debt Instrument [Line Items] Stock issued under compensation plans, net (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Net present value of minimum lease payments Operating Lease, Liability Segment Information Segment Reporting Disclosure [Text Block] Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Total minimum lease payments Finance Lease, Liability, to be Paid Schedule of future minimum finance lease payments Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Remainder of 2023 Long-Term Debt, Maturity, Remainder of Fiscal Year Weighted average number of common shares and potential common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Accounts payable Accounts Payable, Current Other assets Increase (Decrease) in Other Operating Assets 2027 Long-Term Debt, Maturity, Year Four Property and equipment, accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization 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 Entity Filer Category Entity Filer Category Basic (in shares) Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Net present value of minimum lease payments Lease, Liability Lease, Liability Commitments and contingencies Commitments and Contingencies Contract assets, allowance Allowance for doubtful accounts associated with contract assets Contract with Customer, Asset, Allowance for Credit Loss, Current Security Exchange Name Security Exchange Name Letters of credit outstanding Letters of Credit Outstanding, Amount Contract revenues Contract revenues: Revenue from Contract with Customer, Excluding Assessed Tax Non-current Liabilities, Noncurrent [Abstract] Cover [Abstract] Cover [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Weighted-average discount rate - finance leases Finance Lease, Weighted Average Discount Rate, Percent Revenue Recognition Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Total current obligations Lease Obligation Current Represents the lease obligation, current Contract assets, net Changes in contract assets, net, Change Contract assets, net, Change Increase (Decrease) in Contract with Customer, Asset Payments related to tax withholding for stock-based compensation Payment, Tax Withholding, Share-Based Payment Arrangement Total liabilities and shareholders’ equity Liabilities and Equity Term (years) Debt instrument term Debt Instrument, Term 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. Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Related Party [Axis] Related Party [Axis] Remaining availability to repurchase shares Stock Repurchase Program, Remaining Authorized Repurchase Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Cash paid for acquired business, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Current Fiscal Year End Date Current Fiscal Year End Date Financing component Lessee, Operating Lease, Liability, Undiscounted Excess Amount Diluted (in dollars per share) Increase (decrease) in diluted earnings per common share (in dollars per share) Earnings Per Share, Diluted Intangible assets, net of accumulated amortization of $26,673 and $25,439, respectively Intangible Assets, Net (Excluding Goodwill) Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Insurance coverage deductible Loss Contingency Insurance Policy Deductible amount of Deductible Insurance Policy for Loss Contingency Gain on sale of property and equipment Gain on sale of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Consolidation Items [Axis] Consolidation Items [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Total current liabilities Liabilities, Current Wildfire Wildfire [Member] Wildfire [Member] 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Prepaid expenses and other current assets Other Assets, Current Transmission Market Type Transmission [Member] Unrecognized tax benefits Unrecognized Tax Benefits Net Period [Domain] Net Period [Domain] Remaining performance obligations Revenue, Remaining Performance Obligation, Amount Letter of credit facility commitment percentage Line of Credit Facility, Commitment Fee Percentage Other income (expense): Nonoperating Income (Expense) [Abstract] Schedule of future minimum operating lease payments Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line One Entity Address, Address Line One Schedule of Operating And Finance Leases, Disclosure [Table] Schedule of Operating And Finance Leases, Disclosure [Table] n/a Contracts Accounted for under Percentage of Completion Contracts Accounted for under Percentage of Completion [Member] Weighted-average remaining lease term - finance leases Finance Lease, Weighted Average Remaining Lease Term Unbilled revenue, net Unbilled revenue Unbilled Contracts Receivable Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Interest expense Interest Expense 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. Joint Ventures and Noncontrolling Interests Equity Method Investments [Policy Text Block] Credit Facility [Axis] Credit Facility [Axis] Remaining lease term Lessee Operating and Finance Leases Remaining Contract Term Lessee operating and finance leases remaining contract term. Schedule of total debt Schedule of Long-Term Debt Instruments [Table Text Block] Shares vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Tax Identification Number Entity Tax Identification Number Accrued self-insurance Self Insurance Reserve, Noncurrent Schedule of revenue by contract and market type Disaggregation of Revenue [Table Text Block] Leverage coverage ratio Leverage Coverage Ratio The Company has the option to expand the debt coverage ratio in the event of an acquisition. Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Contract assets, net of allowances of $520 and $499, respectively Contract assets, net Contract assets, net Contract with Customer, Asset, after Allowance for Credit Loss, Current 2024 Lease, Liability, To Be Paid, One Year Lease, Liability, To Be Paid, One Year Bonds outstanding Guarantor Obligations, Maximum Exposure, Undiscounted Net decrease in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Weighted average dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Debt instrument restricted maximum liquidity Debt Instrument Restricted Maximum Liquidity Amount of company's consolidated liquidity restricted. Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Interest income Investment Income, Interest Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Less: current portion of finance and operating lease obligations Lease, Liability, Current Lease, Liability, Current Accrued self-insurance Increase (Decrease) in Self Insurance Reserve Interest coverage ratio Debt Instrument Covenant Interest Coverage Ratio Represent the minimum interest coverage ratio under the credit agreement. 2028 Lease, Liability, To Be Paid, Year Five Lease, Liability, To Be Paid, Year Five Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] City Area Code City Area Code 2007 Long-Term Incentive Plan 2007 Long-Term Incentive Plan [Member] 2007 Long-Term Incentive Plan ASSETS Assets [Abstract] Thereafter Lease, Liability, To Be Paid, After Year Five Lease, Liability, To Be Paid, After Year Five Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Other Commitments [Line Items] Other Commitments [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Notes payable to banks Notes Payable to Banks [Member] 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. Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Cash and cash equivalents: Cash and Cash Equivalents, at Carrying Value [Abstract] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] 2024 Long-Term Debt, Maturity, Year One Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense 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. Variable Rate [Axis] Variable Rate [Axis] Financing component Finance Lease, Liability, Undiscounted Excess Amount 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 Other liabilities Other Liabilities, Noncurrent Other liabilities Increase (Decrease) in Other Operating Liabilities Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Purchase orders outstanding Purchase Commitment, Remaining Minimum Amount Committed Thereafter Finance Lease, Liability, to be Paid, after Year Five 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] Right-of-use asset obtained in exchange for new operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Accrued loss provision, Change Increase Decrease In Accrued loss provision The increase (decrease) during the reporting period of the amount of accrued loss provision. Option to terminate leases, period Lessee Operating and Finance Leases Option to Terminate Period Lessee, operating and finance leases, option to terminate, period.