Document And Entity Information [Abstract] Document Information [Table] Legal Entity [Axis] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Trading Symbol Entity Common Stock, Shares Outstanding Commitments and Contingencies Disclosure [Abstract] Commitments Contingencies and Guarantees [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Segment Reporting [Abstract] Earnings Per Share [Abstract] Income per common share: Earnings Per Share [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization and Business [Policy Text Block] The entire disclosure represents the organization and subsidiaries information. Consolidation, Policy [Policy Text Block] Revenue Recognition, Policy [Policy Text Block] Foreign Currency Transactions and Translations Policy [Policy Text Block] Use of Estimates, Policy [Policy Text Block] Contractors [Abstract] Statement [Table] Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Cash Proceeds Received from Share-based Payment Awards [Table Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Organization Consolidation and Presentation of Financial Statements [Table] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Contracts Accounted for under Percentage of Completion [Member] Scenario [Axis] Scenario, Unspecified [Domain] Concentration Risk Benchmark [Axis] Cost Estimate Revision Gross Margin Increase Decrease Percentage Cost Estimate Revision Gross Margin Increase (Decrease) Percentage Percentage of increase decrease cost estimate revision gross margin. Operating Income (Loss) Operating Income (Loss) Income from operations Income from operations Net Income (Loss) Attributable to Parent Net income Net income Net income Earnings Per Share, Diluted Income per common share, diluted (in dollars per share) - Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Statement of Financial Position [Abstract] Class of Stock [Axis] Class of Stock [Domain] Statement [Line Items] Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Beginning of period End of period Accounts Receivable, Net, Current Accounts receivable, net of allowances of $432 and $376, respectively Accounts receivable, net current Costs in Excess of Billings, Current Costs and estimated earnings in excess of billings on uncompleted contracts Insurance Settlements Receivable Receivable for insurance claims in excess of deductibles Income Taxes Receivable, Current Refundable income taxes Other Assets, Current Other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net of accumulated depreciation of $209,466 and $181,575, respectively Property, Plant and Equipment, Net Goodwill Goodwill Goodwill, Net Carrying Amount Intangible Assets, Net (Excluding Goodwill) Intangible assets, net of accumulated amortization of $4,684 and $3,798, respectively Intangible Assets, Net (Excluding Goodwill) Other Assets, Noncurrent Other assets Assets Total assets Assets Liabilities [Abstract] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities, Current [Abstract] Current liabilities Capital Lease Obligations, Current Current portion of capital lease obligations Less: Current portion of capital lease obligations Accounts Payable, Current Accounts payable Billings in Excess of Cost, Current Billings in excess of costs and estimated earnings on uncompleted contracts Billings in excess of costs and estimated earnings on uncompleted contracts Self Insurance Reserve, Current Accrued self insurance Deferred Tax Liabilities, Net, Noncurrent Deferred income tax liabilities Non-current deferred income tax liabilities Long-term Debt, Excluding Current Maturities Long-term debt Capital Lease Obligations, Noncurrent Capital lease obligations, net of current maturities Long-term capital lease obligations Other Liabilities, Noncurrent Other liabilities Preferred Stock, Value, Outstanding Preferred stock - $0.01 par value per share; 4,000,000 authorized shares; none issued and outstanding at December 31, 2016 and December 31, 2015 Common Stock, Value, Issued Common stock - $0.01 par value per share; 100,000,000 authorized shares; 16,333,139 and 19,969,347 shares issued and outstanding at December 31, 2016 and December 31, 2015, respectively Additional Paid in Capital, Common Stock Additional paid-in capital Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive income (loss) Retained Earnings (Accumulated Deficit) Retained earnings Liabilities Total liabilities Contracts in Process [Table] Entity [Domain] Contracts in Process [Line Items] Aggregate Costs Incurred On Uncompleted Contracts And Estimated Earnings Costs and estimated earnings on uncompleted contracts Represents the aggregate of costs incurred on uncompleted contracts and estimated earnings. Billings To Date Less: Billings to date Represents the billings to date on uncompleted contracts accounted for under the percentage-of-completion method. Net Costs And Estimated Earnings In Excess Of Billings Net asset position for contracts in process Represents the net costs and estimated earnings in excess of billings on uncompleted contracts accounted for under the percentage-of-completion method. Effective Income Tax Rate Reconciliation, Percent [Abstract] Differences between the U.S. federal statutory rate and the Company's effective tax rate for continuing operations Income Taxes [Table] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Taxes [Line Items] Commitments and Contingencies [Table] Range [Axis] Range [Domain] Litigation Case [Axis] Litigation Case [Domain] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Award Type [Axis] Equity Award [Domain] Credit Facility [Axis] Credit Facility [Domain] Commitments and Contingencies [Line Items] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Domain] Employee Stock Option [Member] Stock Option [Member] Stock options [Member] Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock-Based Compensation Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options, Outstanding beginning Options, Outstanding ending Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options, Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options, Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Options, Expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-Average Exercise Price, Outstanding beginning Weighted-Average Exercise Price, Outstanding ending Restricted Stock [Member] Restricted stock [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Shares, Outstanding Beginning Shares, Outstanding Ending outstanding performance shares awarded at target by performance measure ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Shares, Granted Shares, Granted at target Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Shares, Vested Vested, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Shares, Forfeited Forfeited, Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Outstanding Beginning Weighted-Average Grant Date Fair Value, Outstanding Ending Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Granted Weighted-Average Grant Date Fair Value, Granted at target Weighted-Average Grant Date Fair Value, Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Forfeited Weighted-Average Grant Date Fair Value, Forfeited Performance Shares [Member] Performance awards [Member] Trading Activity [Axis] Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments OtherThan Options Forfeited For Performance Below Target In Period Shares, Forfeited for performance below target Represents the number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited for performance below target during the reporting period. Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Earned For Performance Above Target In Period Shares, Earned for performance above target Represents the number of equity-based payment instruments other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) earned for performance above target during the period. Trading Activity, by Type [Domain] Plan Name [Axis] Allowance for Doubtful Accounts Receivable, Current Less: Allowance for doubtful accounts Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: Accumulated depreciation and amortization Finite-Lived Intangible Assets, Accumulated Amortization Amortizable Intangible Assets, Accumulated Amortisation Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Outstanding Segment [Table] Segments [Axis] Segments [Domain] TD [Member] T&D [Member] CI [Member] C&I [Member] Corporate Segment [Member] General Corporate [Member] Other [Member] Segment Reporting Information [Line Items] Sales Revenue, Services, Net Contract revenues Contract revenues Revenues Subsegments [Axis] Subsegments [Domain] Geographical [Axis] Earinings Per Share [Table] Earnings Per Share [Line Items] Net Income (Loss) Attributable to Parent [Abstract] Numerator: Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Less: Net income allocated to participating securities Net Income (Loss) Available to Common Stockholders, Basic Net income available to common shareholders Weighted Average Number of Shares Outstanding, Basic [Abstract] Denominator: Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding - Basic (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average dilutive securities Weighted Average Number of Shares Outstanding, Diluted Weighted average common shares outstanding, diluted - Diluted (in shares) Earnings Per Share, Basic Income per common share, basic (in dollars per share) - Basic (in dollars per share) Basic earnings per share (in dollars per share) Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Share Repurchase Program [Axis] Stock Repurchased During Period, Shares Treasury Stock Acquired, Average Cost Per Share Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Income Statement [Abstract] Cost of Services Contract costs Gross Profit Gross profit Gross profit Selling, General and Administrative Expense Selling, general and administrative expenses Amortization of Intangible Assets Amortization of intangible assets Gain (Loss) on Disposition of Property Plant Equipment Gain on sale of property and equipment Gain on sale of property and equipment Nonoperating Income (Expense) [Abstract] Other income (expense): Investment Income, Interest Interest income Interest Expense Interest expense Other Nonoperating Income (Expense) Other income, net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before provision for income taxes Income Tax Expense (Benefit) Income tax expense Income tax expense Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average number of common shares and potential common shares outstanding: Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash flows provided by operating activities - Depreciation Depreciation and amortization of property and equipment Share-based Compensation Stock-based compensation expense Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit) Other Noncash Income (Expense), Total Other non-cash items Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities, net of acquisitions Increase (Decrease) in Accounts Receivable Accounts receivable, net Increase (Decrease) in Unbilled Receivables Costs and estimated earnings in excess of billings on uncompleted contracts Increase (Decrease) in Insurance Settlements Receivable Receivable for insurance claims in excess of deductibles