Contractors [Abstract] Costs incurred on uncompleted contracts Inventory for Long-term Contracts or Programs, Costs Incurred on Uncompleted Contracts Inventory for Long-term Contracts or Programs, Costs Incurred on Uncompleted Contracts Estimated earnings Inventory for Long-term Contracts or Programs, Estimated Earnings on Uncompleted Contracts Inventory for Long-term Contracts or Programs, Estimated Earnings on Uncompleted Contracts Costs incurred and estimated earnings on uncompleted contracts Inventory for Long-term Contracts or Programs, Gross Less: Billings to date Billed Contracts Receivable Costs and estimated earnings in excess of billings on uncompleted contracts, net Costs in Excess of Billings on Uncompleted Contracts, Net Costs in Excess of Billings on Uncompleted Contracts, Net Costs and estimated earnings in excess of billings on uncompleted contracts Costs in Excess of Billings, Current Billings in excess of costs and estimated earnings on uncompleted contracts Billings in Excess of Cost, Current Commitments and Contingencies Disclosure [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2015 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2016 Operating Leases, Future Minimum Payments, Due in Two Years 2017 Operating Leases, Future Minimum Payments, Due in Three Years 2018 Operating Leases, Future Minimum Payments, Due in Four Years 2019 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted stock Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning nonvested shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited/repurchased shares (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending nonvested shares (in shares) Weighted Average Fair Value Per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning nonvested shares (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (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 Vested (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 Forfeited/repurchased shares (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Ending nonvested shares (in dollars per share) Contracts in Progress Long-term Contracts or Programs Disclosure [Text Block] Compensation and Retirement Disclosure [Abstract] Schedule of multiemployer plans Schedule of Multiemployer Plans [Table Text Block] Sale Leaseback Transaction and Operating Leased Assets [Table] Sale Leaseback Transaction and Operating Leased Assets [Table] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Description [Axis] Sale Leaseback Transaction, Name [Domain] Sale Leaseback Transaction, Name [Domain] Office building Office Building [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Vehicles Vehicles [Member] Other facilities Other Facilities [Member] Other Facilities [Member] Land Land [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Sale Leaseback Transaction and Operating Leased Assets [Line Items] [Line Items] for Sale Leaseback Transaction and Operating Leased Assets [Table] Sale Leaseback Transaction [Abstract] Sale Leaseback Transaction [Abstract] Sale Leaseback Transaction [Abstract] Proceeds from the sale-leaseback transaction Sale Leaseback Transaction, Gross Proceeds Sale-leaseback term Sale Leaseback Transaction, Lease Term Sale Leaseback Transaction, Lease Term Deferred gain on sale-leaseback transaction Sale Leaseback Transaction, Deferred Gain, Gross Gain recognized on sale-lease back transaction Sale Leaseback Transaction, Current Period Gain Recognized Rent expense Sale Leaseback Transaction, Rent Expense Options to extend term of the lease for additional five years Sale Leaseback Transaction, Option to Extend Lease Term, Possible Number of Extensions Sale Leaseback Transaction, Option to Extend Lease Term, Possible Number of Extensions Maximum extension term of each option to extend Sale Leaseback Transaction, Option to Extend Lease, Extension Period Sale Leaseback Transaction, Option to Extend Lease, Extension Period Operating Leases, Rent Expense, Net [Abstract] Operating Leases, Rent Expense, Net [Abstract] Rent expense Operating Leases, Rent Expense, Net Lease term of assets subject to operating leases Operating Leases, Lease Term Operating Leases, Lease Term Prepayments of future operating lease payments Prepayments of Operating Lease Payments Prepayments of Operating Lease Payments Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entities [Table] Entities [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Trade name Trade Names [Member] Backlog Order or Production Backlog [Member] Construction equipment Construction Equipment [Member] Construction Equipment [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] West Construction, Inc. West Construction, Inc. [Member] West Construction, Inc. [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Combination, Assets and Liabilities Arising from Contingencies [Abstract] Business Combination, Assets and Liabilities Arising from Contingencies [Abstract] Cash paid to acquire business Payments to Acquire Businesses, Gross Additional potential cash payment consideration, period following acquisition close taken into consideration Business Acquisition, Contingent Consideration, Basis for Potential Cash Payment, Earnings Before Interest, Taxes, Depreciation, and Amortization Generated, Period Following Acquisition Business Acquisition, Contingent Consideration, Basis for Potential Cash Payment, Earnings Before Interest, Taxes, Depreciation, and Amortization Generated, Period Following Acquisition Contingent consideration, at fair value Business Combination, Contingent Consideration, Liability Number of foreign entities the Company acquired ownership interest during period Business Acquisition, Ownership Acquired in Foreign Entities, Number of Entities Business Acquisition, Ownership Acquired in Foreign Entities, Number of Entities Consulting and sales agreement entered into with the acquiree company personnel, contract term Business Acquisition, Consulting and Sales Agreement Entered Into with the Acquiree Company Personnel, Engagement Term Business Acquisition, Consulting and Sales Agreement Entered Into with the Acquiree Company Personnel, Engagement Term Lease agreement with the Seller company, lease term Business Acquisition, Lease Agreement with Acquiree, Term Business Acquisition, Lease Agreement with Acquiree, Term Acquired intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Acquired intangible assets useful life Finite-Lived Intangible Asset, Useful Life Property and equipment useful life Property, Plant and Equipment, Useful Life Goodwill Goodwill Goodwill acquired during period, amortization period for tax purposes Goodwill Acquired During Period, Amortization Period for Tax Purposes Goodwill Acquired During Period, Amortization Period for Tax Purposes Earnings Per Share [Abstract] Basic: Weighted Average Number of Shares Outstanding, Basic [Abstract] Weighted average shares outstanding Weighted Average Number of Shares Outstanding, Basic Diluted: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Common stock options Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Total weighted average shares outstanding assuming dilution Weighted Average Number of Shares Outstanding, Diluted Shares of common stock issued from the exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Earnings (Loss) Per Share Earnings Per Share [Text Block] Schedule of components of income tax expense (benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of effective income tax reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of net deferred tax assets and liabilities as reported in the balance sheet Schedule of Net Deferred Tax Assets and Liabilities as Reported in the Balance Sheet [Table Text Block] Schedule of Net Deferred Tax Assets and Liabilities as Reported in the Balance Sheet [Table Text Block] Risks and Uncertainties [Abstract] Concentration Risk [Table] Concentration Risk [Table] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer concentration risk Customer Concentration Risk [Member] Customer by Type [Axis] Customer by Type [Axis] Customer by Type [Axis] Customer by Type [Domain] Customer by Type [Domain] Customer by Type [Domain] Federal Government Customer Type, Federal [Member] Customer Type, Federal [Member] State Governments Customer Type, State [Member] Customer Type, State [Member] Local Governments Customer Type, Local [Member] Customer Type, Local [Member] Private Companies Customer Type, Private [Member] Customer Type, Private [Member] Major Customers [Axis] Customer [Axis] Name of Major Customer [Domain] Customer [Domain] Private sector customer Private Sector Customer [Member] Private Sector Customer [Member] US Army Corps of Engineers U.S. Army Corps of Engineers [Member] U.S. Army Corps of Engineers [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Trade and contract retainage receivables Trade and Contract Retainage Receivables [Member] Trade and Contract Retainage Receivables [Member] Contract revenues Sales Revenue, Services, Net [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Foreign Foreign [Member] Foreign [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Trade and retainage receivables Trade Accounts Receivable and Contract Receivable Retainage, Net Trade Accounts Receivable and Contract Receivable Retainage, Net Concentration risk, percentage Concentration Risk, Percentage Contract revenues Contracts Revenue Contract revenues, percent Contracts Revenue, Percent Contracts Revenue, Percent Concentration of Risk and Enterprise Wide Disclosures Concentration Risk Disclosure [Text Block] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] Fixed assets, including inventory Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory, Property, Plant, and Equipment Seller receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Receivables Intangible assets Payable to Seller Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Payables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Payables Noncontrolling interest Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Total recognized identifiable assets acquired, goodwill, and liabilities assumed, net Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Amortization expense, expected to be recorded in 2015 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Employee Benefits Compensation and Employee Benefit Plans [Text Block] Goodwill [Roll Forward] Goodwill [Roll Forward] Beginning balance, January 1 Additions Goodwill, Acquired During Period Ending balance Accounting Policies [Abstract] Accounts Receivable [Abstract] Receivables [Abstract] Contract receivable retention Contract Receivable Retainage Retainage, long-term Contract Receivable Retainage, Due after Next Twelve Months Quarterly Financial Information Disclosure [Abstract] Selected Quarterly Financial Information [Abstract] Selected Quarterly Financial Information [Abstract] Revenues Gross profit Gross Profit Operating (loss) income Operating Income (Loss) (Loss) income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Net (loss) income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net (loss) income attributable to common stockholders Net Income (Loss) Attributable to Parent Earnings Per Share, Basic and Diluted [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Basic (in dollars per share) Earnings Per Share, Basic Diluted loss per share (in dollars per share) Earnings Per Share, Diluted Effective Income Tax Rate Reconciliation, Amount [Abstract] Statutory amount (computed at 35%) Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income tax, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Permanent differences Income Tax Reconciliation, Permanent Differences Income Tax Reconciliation, Permanent Differences Permanent differences, incentive stock options Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount True up of deferred balances for non-qualified stock options Effective Income Tax Rate Reconciliation, Other Adjustments, Amount True up to prior year taxes Effective Income Tax Rate Reconciliation, State Taxes Adjustments, Amount Effective Income Tax Rate Reconciliation, State Taxes Adjustments, Amount True up to prior year taxes Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount Other (net) Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Total Income Tax Expense (Benefit) Consolidated effective tax rate Effective Income Tax Rate Reconciliation, Percent Federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Schedule of quarterly financial information Schedule of Quarterly Financial Information [Table Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable: Accounts Receivable, Net, Current [Abstract] Trade, net of allowance of $0 Trade Accounts Receivable, Net, Current Trade Accounts Receivable, Net, Current Retainage Contract Receivable Retainage, Due in Next Twelve Months Other Other Receivables Income taxes receivable Income Taxes Receivable, Current Inventory Inventory, Net Deferred tax asset Deferred Tax Assets, Net, Current Asset held for sale Assets Held-for-sale, Current Prepaid expenses and other Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Inventory, non-current Inventory, Noncurrent Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Current debt Debt, Current Accounts payable: Accounts Payable, Current [Abstract] Trade Accounts Payable, Trade, Current Retainage Retention Payable, Due in Next Rolling Twelve Months Accrued liabilities Accrued Liabilities, Current Accrued Income Taxes, Current Accrued Income Taxes, Current Billings in excess of costs and estimated earnings on uncompleted contracts Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Other long-term liabilities Other Liabilities, Noncurrent Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Deferred revenue Deferred Revenue, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock -- $0.01 par value, 10,000,000 authorized, none issued Preferred Stock, Value, Issued Common stock -- $0.01 par value, 50,000,000 authorized, 27,969,783 and 27,710,776 issued; 27,525,365 and 27,393,045 outstanding at December 31, 2014 and December 31, 2013, respectively Common Stock, Value, Issued Treasury stock, 361,231 and 317,731 shares, at cost December 31, 2014 and December 31, 2013, respectively Treasury Stock, Value Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Equity attributable to common stockholders Stockholders' Equity Attributable to Parent Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total stockholders’ equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total liabilities and stockholders’ equity Liabilities and Equity Accounts receivable Schedules of concentration of risk, by risk factor Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Schedule of recognized identified assets acquired and liabilities assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock options Employee Stock Option [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Anti-dilutive stock options Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Schedule of changes in goodwill Schedule of Goodwill [Table Text Block] Schedule of changes and amortization of finite-lived intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Beginning stock options outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Ending stock options outstanding (in shares) Weighted Average Exercise Price Per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Beginning stock options outstanding (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Ending stock options outstanding (in dollars per share) December 31, 2014 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Weighted Average Exercise Price Per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Weighted Average Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value December 31, 2014 Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price Per Share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Measurements, Nonrecurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level II Fair Value, Inputs, Level 2 [Member] Level III Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets acquired in business combinations Tangible Assets, Fair Value Disclosure Tangible Assets, Fair Value Disclosure Goodwill and other intangibles Goodwill and Intangible Assets, Fair Value Disclosure Goodwill and Intangible Assets, Fair Value Disclosure Fair value of earnout liability Contingent Consideration, Fair Value Disclosure Contingent Consideration, Fair Value Disclosure Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State State and Local Jurisdiction [Member] Internal Revenue Service (IRS) Internal Revenue Service (IRS) [Member] Operating Loss Carryforwards [Line Items] Net operating loss carryforward Operating Loss Carryforwards Cash benefits received from operating loss carrybacks Refunds Received from Application of Operating Loss Carrybacks Refunds Received from Application of Operating Loss Carrybacks Alternative minimum tax credits, non-expiring Tax Credit Carryforward, Amount Excess tax benefit from stock option exercise Unrecognized Tax Benefits Additional tax expense related to penalties and interest incurred Income Tax Examination, Penalties and Interest Expense Organization, Consolidation and Presentation of Financial Statements [Abstract] Description of Business and Basis of Presentation Business Description and Basis of Presentation [Text Block] Fair value measurement of fixed assets and goodwill on a non-recurring basis Fair Value Measurements, Nonrecurring [Table Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Percentage-of-Completion Method [Policy Text Block] Classification of Current Assets and Liabilities Classification of Current Assets and Liabilities [Policy Text Block] Classification of Current Assets and Liabilities [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Foreign Currencies Foreign Currency Transactions and Translations Policy [Policy Text Block] Risk Concentrations Concentration Risk, Credit Risk, Policy [Policy Text Block] Accounts Receivable Receivables, Policy [Policy Text Block] Advertising Costs Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Environmental Costs Environmental Costs, Policy [Policy Text Block] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Inventory Inventory, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Insurance Coverage Insurance Coverage [Policy Text Block] Insurance Coverage [Policy Text Block] Warranty Costs Standard Product Warranty, Policy [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Business Acquisition Business Combination Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Schedule of future minimum rental payments for operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Payables and Accruals [Abstract] Schedule of accrued liabilities Schedule of Accrued Liabilities [Table Text Block] Summary of Significant Accounting Principles Significant Accounting Policies [Text Block] Current assets: Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Stockholders' Equity: Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Treasury stock, shares Treasury Stock, Shares Fair Value Fair Value Disclosures [Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Equity Award [Domain] Stock Option Equity Option [Member] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Weighted average grant-date fair value of options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Expected term of options Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Accrued Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Revenue growth rate implied in reporting units valuations, number of years projected Fair Value Measurement, Assumptions Used to Calculate Reporting Unit Fair Value, Revenue Growth Rate, Period Evaluated Fair Value Measurement, Assumptions Used to Calculate Reporting Unit Fair Value, Revenue Growth Rate, Period Evaluated Fair Value Inputs, Discount Rate Fair Value Inputs, Discount Rate Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount Debt Disclosure [Abstract] Long-term Debt and Line of Credit Debt Disclosure [Text Block] Depreciable lives of property and equipment Property, Plant and Equipment [Table Text Block] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Defined Contribution Plan [Table] Contribution Plan, Employer Matching Contribution [Axis] Contribution Plan, Employer Matching Contribution [Axis] Contribution Plan, Employer Matching Contribution [Axis] Contribution Plan, Employer Matching Contribution [Domain] Contribution Plan, Employer Matching Contribution [Domain] [Domain] for Contribution Plan, Employer Matching Contribution [Axis] Range 1 Range One [Member] Range One [Member] Range 2 Range Two [Member] Range Two [Member] Defined Contribution Plan [Line Items] Defined Contribution Plan [Line Items] [Line Items] for Defined Contribution Plan [Table] 401 (k) Retirement Plan [Abstract] Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] Minimum service period for plan eligibility Defined Contribution Plan, Requisite Service Period Defined Contribution Plan, Requisite Service Period Minimum allowable contribution to the plan by each employee, percent Defined Contribution Plan, Annual Contribution By Employee, Minimum Allowable Amount, Percent Defined Contribution Plan, Annual Contribution By Employee, Minimum Allowable Amount, Percent Maximum allowable contribution to the plan by each employee, percent Defined Contribution Plan, Annual Contribution By Employee, Maximum Allowable Amount, Percent Defined Contribution Plan, Annual Contribution By Employee, Maximum Allowable Amount, Percent Employer matching contribution, percent Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer matching contribution, percent of employee's gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Employers matching contribution, vesting period Defined Contribution Plan, Employers Matching Contribution, Vesting Period Defined Contribution Plan, Employers Matching Contribution, Vesting Period Company contributions to the plan Defined Contribution Plan, Cost Recognized Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for doubtful accounts Allowance for Doubtful Accounts [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Activity in Provision for Doubtful Accounts Movement in Valuation Allowances and Reserves [Roll Forward] Balance at the Beginning of the Period Valuation Allowances and Reserves, Balance Charged to Revenue, Cost or Expense Valuation Allowances and Reserves, Charged to Cost and Expense Deduction Valuation Allowances and Reserves, Deductions Balance at the End of the Period Summary of property and equipment Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Significant Acquisitions and Disposals by Transaction [Axis] Significant Acquisitions and Disposals by Transaction [Axis] Significant Acquisitions and Disposals, Transaction [Domain] Significant Acquisitions and Disposals, Transaction [Domain] Purchase of the assets of West Construction Purchase of the Assets of West Construction [Member] Purchase of the Assets of West Construction [Member] Depreciable Assets [Member] Depreciable Assets [Member] Automobiles and trucks Building and improvements Building and Building Improvements [Member] Dredges and dredging equipment Marine Services Equipment [Member] Office equipment Office Equipment [Member] Construction in progress Construction in Progress [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, plant and equipment, gross Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Depreciation expense Depreciation Purchase price of significant acquisitions during period Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds Fixed assets increase due to acquisition Property, Plant and Equipment, Additions Impairment loss on assets held-for-sale Impairment of Long-Lived Assets Held-for-use Proceeds from sale of productive assets Proceeds from Sale of Productive Assets Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Treasury Stock Treasury Stock [Member] Additional Paid-In Additional Paid-in Capital [Member] Retained Retained Earnings [Member] Non-controlling Interest Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance, shares Beginning balance Beginning treasury stock, shares Stock-based compensation Share-based Compensation Exercise of stock options, shares Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Issue restricted stock, shares Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Issue restricted stock Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Noncontrolling interest, acquired Noncontrolling Interest, Increase from Business Combination Distributions to noncontrolling interest Proceeds from Noncontrolling Interests Purchase of stock into treasury, shares Treasury Stock, Shares, Acquired Purchase of stock into treasury Treasury Stock, Value, Acquired, Cost Method Ending balance, shares Ending balance Ending treasury stock, shares Finite-lived Intangible Assets, Gross [Roll Forward] Finite-lived Intangible Assets, Gross [Roll Forward] Finite-lived Intangible Assets, Gross [Roll Forward] Intangible assets, January 1 Finite-Lived Intangible Assets, Gross Additions Finite-lived Intangible Assets Acquired Total intangible assets, end of year Accumulated Amortization [Roll Forward] Accumulated Amortization [Roll Forward] Accumulated Amortization [Roll Forward] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Current year amortization Amortization of Intangible Assets Total accumulated amortization Net intangible assets, end of year Finite-Lived Intangible Assets, Net Inventory Disclosure [Abstract] Accrued Liabilities, Current [Abstract] Accrued Liabilities, Current [Abstract] Accrued salaries, wages and benefits Employee-related Liabilities, Current Accrual for self-insurance liabilities Accrued Insurance, Current Property taxes Accrual for Taxes Other than Income Taxes, Current Sales and Excise Tax Payable Sales and Excise Tax Payable Other accrued expenses Other Accrued Liabilities, Current Total accrued liabilities Schedule II - Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Equity [Abstract] Stock Repurchase Program [Abstract] Stock Repurchase Program [Abstract] Stock Repurchase Program [Abstract] Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Stock repurchase program, expected duration Stock Repurchase Program, Expected Duration Stock Repurchase Program, Expected Duration Stock repurchased during period, shares Stock repurchased during period, average cost per share Treasury Stock Acquired, Average Cost Per Share Schedule of earnings per share, basic and diluted Schedule of Weighted Average Number of Shares [Table Text Block] Inventory Inventory Disclosure [Text Block] Statement of Cash Flows [Abstract] Acquisition of business in Alaska Acquisition of Business in Alaska [Member] Acquisition of Business in Alaska [Member] Acquisition of business in Pacific Northwest Acquisition of business in Pacific Northwest [Member] Acquisition of business in Pacific Northwest [Member] Acquisition in February 2010 of business located in Pacific Northwest Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Adjustments to reconcile net loss to net cash provided by operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Deferred financing cost amortization Amortization of Financing Costs Bad debt expense Provision for Doubtful Accounts Deferred income taxes Deferred Income Tax Expense (Benefit) (Gain)/Loss on sale of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Change in contingent liability related to earnout Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Change in operating assets and liabilities, net of effects of acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Income tax receivable Increase (Decrease) in Income Taxes Receivable Inventory Increase (Decrease) in Inventories Note receivable Increase (Decrease) in Notes Receivable, Current Prepaid expenses and other Increase (Decrease) in Prepaid Expense and Other Assets Costs and estimated earnings in excess of billings on uncompleted contracts Increase Decrease in Costs in excess of billings Increase Decrease in Costs in excess of billings Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Income tax payable Increase (Decrease) in Income Taxes Payable Billings in excess of costs and estimated earnings on uncompleted contracts Increase (Decrease) in Billing in Excess of Cost of Earnings Deferred revenue Increase (Decrease) in Deferred Revenue Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from sale of property and equipment Proceeds from Sale of Property, Plant, and Equipment Purchase of property and equipment Payments to Acquire Property, Plant, and Equipment Payments for acquisition of businesses Payments to Acquire Businesses, Net of Cash Acquired Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Borrowings from Credit Facility Proceeds from Lines of Credit Payments made on borrowings from Credit Facility Repayments of Debt Contributions from noncontrolling interest Proceeds from (Payments to) Noncontrolling Interests Exercise of stock options Proceeds from Stock Options Exercised Excess tax benefit from stock option exercise Excess Tax Benefit from Share-based Compensation, Financing Activities Increase in loan costs Payments of Financing Costs Purchase of shares into treasury Payments for Repurchase of Equity Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Net change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental disclosures of cash flow information, cash paid during the period for: Supplemental Cash Flow Information [Abstract] Interest Interest Paid Taxes (net of refunds) Income Taxes Paid, Net Supplemental disclosure of non cash transaction: Noncash Investing and Financing Items [Abstract] Fair value of earnout from acquisition of business in Alaska Other Noncash Expense Equipment improvement Equipment Improvement [Member] Equipment Improvement [Member] Dry-docking capitalized costs Dry-docking Capitalized Costs [Member] Dry-docking Capitalized Costs [Member] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Service Life Service Life [Member] Diluted (in dollars per share) Summary of Deferred Tax Assets and Liabilities, as Reported in the Balance Sheet [Abstract] Deferred Tax Assets and Liabilities, Net, Classification [Abstract] Deferred Tax Assets and Liabilities, Net, Classification [Abstract] Net current deferred tax assets Net non-current deferred tax liabilities Total net deferred tax liabilities: Deferred Tax Liabilities, Net Schedule of Insurance Coverage [Table] Schedule of Insurance Coverage [Table] Schedule of Insurance Coverage [Table] Insurance Coverage by Liability Policies [Axis] Insurance Coverage by Liability Policies [Axis] Insurance Coverage by Liability Policies [Axis] Insurance Coverage by Liability Policies [Domain] Insurance Coverage by Liability Policies [Domain] Insurance Coverage by Liability Policies [Domain] Other liability policies Other Liability Policies [Member] Other Liability Policies [Member] Maritime employer's liability Maritime Employer's Liability [Member] Maritime Employer's Liability [Member] Watercraft pollution policy Watercraft Pollution Policy [Member] Watercraft Pollution Policy [Member] Insurance Coverage [Line Items] Insurance Coverage [Line Items] Insurance Coverage [Line Items] Levels of insurance coverage maintained by the Company Levels of Insurance Coverage Maintained by the Company Levels of Insurance Coverage Maintained by the Company Amount in excess of primary insurance coverage Additional Coverage in Excess of Primary Insurance Coverage Additional Coverage in Excess of Primary Insurance Coverage Primary limit of insurance coverage Primary Limit of Insurance Coverage Primary Limit of Insurance Coverage Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Director Director [Member] Officers and Executives Officers and Executives [Member] Officers and Executives [Member] Approved and authorized maximum number of shares to be issued Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Options, expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Options, vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Fair value of equity compensation grants awarded Compensation Arrangement with Individual, Fair Value of Shares Issued Compensation Arrangement with Individual, Fair Value of Shares Issued Grants awarded during period Compensation Arrangement with Individual, Shares Issued Compensation Arrangement with Individual, Shares Issued Compensation expense related to stock based awards outstanding Allocated Share-based Compensation Expense Forfeiture rate applied to options Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Forfeiture Rate Proceeds received upon exercise of stock options Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options Total share-based compensation cost not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Share-based compensation cost not yet recognized, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Total fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Components of Deferred Tax Assets and Liabilities [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Assets related to: Components of Deferred Tax Assets [Abstract] Current Components of Deferred Tax Assets, Current Components of Deferred Tax Assets, Current Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities, Current Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities, Current Intangible assets Deferred Tax Assets, Intangible Assets, Current Deferred Tax Assets, Intangible Assets, Current Non-qualified stock options Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Non-qualified Stock Options, Current Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Non-qualified Stock Options, Current Other Deferred Tax Assets, Other, Current Deferred Tax Assets, Other, Current Total assets Deferred Tax Assets, Net of Valuation Allowance, Current Long- term Components of Deferred Tax Assets, Noncurrent [Abstract] Components of Deferred Tax Assets, Noncurrent [Abstract] Intangible assets Deferred Tax Assets, Intangible Assets, Noncurrent Deferred Tax Assets, Intangible Assets, Noncurrent Net operating loss carryforward Deferred Tax Assets, Operating Loss Carryforwards, Noncurrent Deferred Tax Assets, Operating Loss Carryforwards, Noncurrent Non-qualified stock options Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Non-qualified Stock Options, Noncurrent Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Non-qualified Stock Options, Noncurrent Foreign tax credits Deferred Tax Assets, Tax Credit Carryforwards, Foreign AMT credits Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax Other Deferred Tax Assets, Other, Noncurrent Deferred Tax Assets, Other, Noncurrent Total assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Liabilities related to: Components of Deferred Tax Liabilities [Abstract] Current Components of Deferred Tax Liabilities, Current [Abstract] Components of Deferred Tax Liabilities, Current [Abstract] Deferred revenue on maintenance contracts Deferred Tax Liabilities, Tax Deferred Income, Current Deferred Tax Liabilities, Tax Deferred Income, Current Other Deferred Tax Liabilities, Other, Current Deferred Tax Liabilities, Other, Current Total liabilities Deferred Tax Liabilities, Gross, Current Long- term Components of Deferred Tax Liabilities, Noncurrent [Abstract] Components of Deferred Tax Liabilities, Noncurrent [Abstract] Depreciation and amortization Deferred Tax Liabilities, Property, Plant and Equipment and Intangible Assets, Noncurrent Deferred Tax Liabilities, Property, Plant and Equipment and Intangible Assets, Noncurrent Goodwill Deferred Tax Liabilities, Goodwill and Gain on Acquisition, Noncurrent Deferred Tax Liabilities, Goodwill and Gain on Acquisition, Noncurrent Deferred revenue on maintenance contracts Deferred Tax Liabilities, Tax Deferred Income, Noncurrent Deferred Tax Liabilities, Tax Deferred Income, Noncurrent Other Deferred Tax Liabilities, Other, Noncurrent Deferred Tax Liabilities, Other, Noncurrent Total liabilities Deferred Tax Liabilities, Gross, Noncurrent Net current deferred tax assets Net non-current deferred tax liabilities Advertising Expense [Abstract] Advertising Expense and Warranty Accrual [Abstract] Advertising Expense and Warranty Accrual [Abstract] Advertising expense Advertising Expense Income Statement [Abstract] Costs of contract revenues Contract Revenue Cost Gross profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income (loss) Other income (expense): Other Nonoperating Income (Expense) [Abstract] Gain (loss) from sale of assets, net Other income Nonoperating Income (Expense) Interest income Interest Income, Deposits with Financial Institutions Interest expense Interest Expense Other income (expense), net Other Nonoperating Income (Expense) Income (loss) before income taxes Income tax expense (benefit) Net income (loss) Basic loss per share (in dollars per share) Shares used to compute income (loss) per share Basic (shares) Diluted (shares) Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract] Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract] U.S. Federal Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Federal Tax Expense (Benefit) Deferred Deferred Federal Income Tax Expense (Benefit) Total Federal Income Tax Expense (Benefit), Continuing Operations State and local State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current State and Local Tax Expense (Benefit) Deferred Deferred State and Local Income Tax Expense (Benefit) Total State and Local Income Tax Expense (Benefit), Continuing Operations Current Foreign Tax Expense (Benefit) Current Foreign Tax Expense (Benefit) Deferred Foreign Income Tax Expense (Benefit) Deferred Foreign Income Tax Expense (Benefit) Foreign Income Tax Expense (Benefit), Continuing Operations Foreign Income Tax Expense (Benefit), Continuing Operations Total Income Taxes Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Current Income Tax Expense (Benefit) Deferred Schedule of restricted stock activity Schedule of Nonvested Share Activity [Table Text Block] Schedule of stock options activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of stock option valuation assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of intrinsic value of options exercised and fair value of shares vested Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] Contracts in progress Schedule of Long-term Contracts or Programs in Progress [Table Text Block] Schedule of Long-term Contracts or Programs in Progress [Table Text Block] Selected Quarterly Financial Data Quarterly Financial Information [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Credit Facility, Name [Axis] Credit Facility, Name [Axis] Credit Facility, Name [Axis] Credit Facility Name [Domain] Credit Facility Name [Domain] Credit Facility Name [Domain] Amended credit agreement Amended Credit Agreement of 2012 [Member] Amended Credit Agreement of 2012 [Member] Line of Credit, Borrowing Capacity Base Components [Axis] Line of Credit, Borrowing Capacity Base Components [Axis] Line of Credit, Borrowing Capacity Base Components [Axis] Line of Credit, Borrowing Capacity Base Components [Domain] Line of Credit, Borrowing Capacity Base Components [Domain] Line of Credit, Borrowing Capacity Base Components [Domain] Eligible accounts receivable Eligible Accounts Receivable [Member] Eligible Accounts Receivable [Member] Adjusted cash balance Adjusted Cash Balance [Member] Adjusted Cash Balance [Member] Credit Facility, Loan Type [Axis] Credit Facility, Loan Type [Axis] Credit Facility, Loan Type [Axis] Credit Facility, Loan Type [Domain] Credit Facility, Loan Type [Domain] Credit Facility, Loan Type [Domain] Prime rate based Loans Prime Rate Based Loans [Member] Prime Rate Based Loans [Member] Eurodollar Loans Eurodollar Rate Loan [Member] Eurodollar Rate Loan [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Line of Credit [Member] Revolving Credit Facility [Member] Letter of credit Letter of Credit [Member] Swingline loan Swingline Loan [Member] Swingline Loan [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Secured debt Secured Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Term Loan One [Member] Term Loan One [Member] Term Loan One [Member] Term Loan Two [Member] Term Loan Two [Member] Term Loan Two [Member] Revolving Credit Facility, Interest Rate Options [Axis] Revolving Credit Facility, Interest Rate Options [Axis] Revolving Credit Facility, Interest Rate Options [Axis] Revolving Credit Facility, Interest Rate Options [Domain] Revolving Credit Facility, Interest Rate Options [Domain] Revolving Credit Facility, Interest Rate Options [Domain] LIBOR LIBOR [Member] LIBOR [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Line of credit facility, current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Line of credit facility, additional borrowing capacity Line of Credit Facility, Additional Borrowing Capacity Line of Credit Facility, Additional Borrowing Capacity Line of credit facility, integral multiple of borrowings Line of Credit Facility, Integral Multiple of Borrowings Line of Credit Facility, Integral Multiple of Borrowings Line of credit, current borrowing capacity base components Line of Credit, Current Borrowing Capacity Base Components Line of Credit, Current Borrowing Capacity Base Components balance outstanding under revolver balance outstanding under revolver balance outstanding under revolver Proceeds from credit facility Letters of credit outstanding, amount Letters of Credit Outstanding, Amount Line of credit facility, revolving credit converted to term loan, amount outstanding Line of Credit Facility, Revolving Credit Converted to Term Loan, Amount Outstanding Line of Credit Facility, Revolving Credit Converted to Term Loan, Amount Outstanding Debt Instrument, Face Amount Debt Instrument, Face Amount Debt instrument, periodic payment, principal Debt Instrument, Periodic Payment, Principal Debt Instrument, Periodic Payment Debt Instrument, Periodic Payment Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Fixed Charge Coverage Ratio Fixed Charge Coverage Ratio Fixed Charge Coverage Ratio Leverage Ratio Leverage Ratio Leverage Ratio Line of credit facility, unused capacity commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Debt instrument, description of variable rate basis Debt Instrument, Description of Variable Rate Basis Line of credit facility, interest rate at period end Line of Credit Facility, Interest Rate at Period End Line of credit facility, interest rate during period Line of Credit Facility, Interest Rate During Period Purchase of Common Shares Treasury Stock [Text Block] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying (reported) amount, fair value disclosure Reported Value Measurement [Member] Debt Instrument, Fair Value Disclosure Debt Instrument, Fair Value Disclosure Schedule of Multiemployer Plans [Table] Schedule of Multiemployer Plans [Table] Multiemployer Plan Type [Axis] Multiemployer Plan Type [Axis] Multiemployer Plans Type [Domain] Multiemployer Plans Type [Domain] Multiemployer Plans, Pension Multiemployer Plans, Pension [Member] Collective Bargaining Arrangement [Axis] Collective Bargaining Arrangement [Axis] Collective Bargaining Arrangement [Domain] Collective Bargaining Arrangement [Domain] International Union of Operating Engineers-Employers Construction Industry Retirement Plan International Union of Operating Engineers-Employers Construction Industry Retirement Plan [Member] International Union of Operating Engineers-Employers Construction Industry Retirement Plan [Member] Associated General Contractors of Washington Carpenter, Piledrivers, and Millwrights Associated General Contractors of Washington Carpenter, Piledrivers, and Millwrights [Member] Associated General Contractors of Washington Carpenter, Piledrivers, and Millwrights [Member] Alaska Carpenters Trust Fund Alaska Carpenters Trust Fund [Member] Alaska Carpenters Trust Fund [Member] Alaska Laborers Trust Fund [Member] Alaska Laborers Trust Fund [Member] Alaska Laborers Trust Fund [Member] Multiemployer Plans [Line Items] Multiemployer Plans [Line Items] Contributions Multiemployer Plan, Period Contributions Expiration of Collective Bargaining Agreement Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date