Goodwill and Intangible Assets Disclosure [Abstract] Carrying value of goodwill by segment Schedule of Goodwill [Table Text Block] Carrying value of other intangible assets Schedule Of Intangible Assets Excluding Goodwill Table [Table Text Block] Schedule of intangible assets excluding goodwill. Compensation and Retirement Disclosure [Abstract] Employee Benefit Plans Compensation and Employee Benefit Plans [Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, less allowances (2013 - $795; 2012 - $1,201) Accounts Receivable, Net, Current Costs and estimated earnings in excess of billings on uncompleted contracts Costs in Excess of Billings on Uncompleted Contracts or Programs Expected to be Collected within One Year Inventories Inventory, Net Income taxes receivable Income Taxes Receivable, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Other current assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, at cost: Property, Plant and Equipment, Gross [Abstract] Land and buildings Land Buildings And Improvements Gross Land Buildings And Improvements Gross Construction equipment Machinery and Equipment, Gross Transportation equipment Transportation Equipment Gross Transportation Equipment Gross Office equipment and software Office Equipment and Capitalized Computer Software Gross Office equipment and capitalized computer software gross. Construction in progress Construction in Progress, Gross Property, plant and equipment at cost, gross Property, Plant and Equipment, Gross Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, plant and equipment at cost, net Property, Plant and Equipment, Net Goodwill Goodwill Other intangible assets 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] Accounts payable Accounts Payable, Current Billings on uncompleted contracts in excess of costs and estimated earnings Billings in Excess of Cost Accrued wages and benefits Employee-related Liabilities, Current Accrued insurance Accrued Insurance, Current Income taxes payable Accrued Income Taxes, Current Other accrued expenses Other Liabilities, Current Total current liabilities Liabilities, Current Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Commitments and contingencies Commitments and Contingencies Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock - $.01 par value; 60,000,000 shares authorized; 27,888,217 shares issued as of June 30, 2013 and June 30, 2012 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Total stockholders' equity before treasury stock Stockholders' Equity before Treasury Stock Less treasury stock, at cost - 1,779,593 and 2,141,990 shares as of June 30, 2013 and June 30, 2012 Treasury Stock, Value Total stockholders' equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders' equity Liabilities and Equity Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Statement of Other Comprehensive Income [Abstract] Foreign currency translation adjustments, tax effect Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Income Tax Disclosure [Abstract] Schedule of sources of pretax income Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Components of the provision for income taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Difference between expected income tax provision applying domestic federal statutory tax rate and reported income tax provision Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Significant components of Company's deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Significant components of Company's deferred tax assets and liabilities as reported in consolidated balance sheets Schedule of Components of Deferred Tax Assets and Liabilities Net [Table Text Block] Schedule of components of deferred tax assets and Liabilities, net. Income Statement [Abstract] Revenues Sales Revenue, Services, Net Cost of revenues Cost of Services Gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income Operating Income (Loss) Other income (expense): Other Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Interest income Investment Income, Interest Other Other Nonoperating Income (Expense) Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for federal, state and foreign income taxes Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Basic earnings per common share Earnings Per Share, Basic Diluted earnings per common share Earnings Per Share, Diluted Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted 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] Joint Pension Fund Local Union One Six Four Ibew [Member] Joint Pension Fund Local Union One Six Four Ibew [Member] Joint pension fund local union 164 Ibew. Boilermaker-Blacksmith National Pension Trust [Member] Boilermaker Blacksmith National Pension Trust [Member] Boilermaker blacksmith national pension trust. Joint Pension Fund Local Union Number One Zero Two [Member] [Domain] Joint Pension Fund Local Union Number One Zero Two [Member] [Domain] [Domain] for Joint Pension Fund Local Union Number One Zero Two IBEW Local Four Five Six Pension Plan [Member] [Domain] IBEW Local Four Five Six Pension Plan [Member] [Domain] [Domain] for IBEW Local Four Five Six Pension Plan Local 351 IBEW Pension Plan [Member] Local Three Five One Ibew Pension Plan [Member] Local 351 Ibew pension plan. Steamfitters Local Union Number Four Two Zero Pension Plan [Member] [Domain] Steamfitters Local Union Number Four Two Zero Pension Plan [Member] [Domain] [Domain] for Steamfitters Local Union Number Four Two Zero Pension Plan Multiemployer Plans [Line Items] Multiemployer Plans [Line Items] Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, Description Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date, Description Multiemployer Pension Plans Multiemployer Plans [Abstract] EIN/Pension Plan Number Multiemployer Plans Number Multiemployer plans number. Pension Protection Act Zone Status Multiemployer Plans, Certified Zone Status FIP/RP Status Pending or Implemented Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan Total contributions made Multiemployer Plan, Period Contributions Surcharge Imposed Multiemployer Plans, Surcharge Expiration Date of Collective-Bargaining Agreement Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date Contributions to other multiemployer plans Contributions To Other Multiemployer Plans Contributions to other multiemployer plans. Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [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] Intellectual Property [Member] Intellectual Property [Member] Intellectual property. Customer Relationships [Member] Customer Relationships [Member] Customer based [Member] Customer Based [Member] Customer based member. Noncompete Agreements [Member] Noncompete Agreements [Member] Trade Names [Member] Trade Names [Member] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets by Major Class [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Trade Names [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-lived Intangible Assets, Fair Value Disclosure Finite-lived Intangible Assets, Fair Value Disclosure Carrying value of other intangible assets Intangible Assets, Net (Excluding Goodwill) [Abstract] Useful life of intangible assets Finite-Lived Intangible Asset, Useful Life Gross carrying amount Finite-Lived Intangible Assets, Gross Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Net carrying amount Finite-Lived Intangible Assets, Net Indefinite-lived trade names Indefinite-Lived Trade Names Intangible assets, gross, excluding Goodwill Intangible Assets Gross Excluding Goodwill Intangible assets gross excluding goodwill. Accumulated amortization - Intangible assets, excluding Goodwill Intangible Assets Accumulated Amortization Excluding Goodwill Intangible assets accumulated amortization excluding goodwill. Intangible assets, net, excluding Goodwill Segment Reporting [Abstract] Results of Operations Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of revenues and long lived assets according to geographic areas Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Statement [Table] Statement [Table] Major Customers [Axis] Major Customers [Axis] Name of Major Customer [Domain] Name of Major Customer [Domain] Western Canada Aboveground Storage Tank Project [Member] Western Canada Aboveground Storage Tank Project [Member] Western Canada Aboveground Storage Tank Project [Member] Statement [Line Items] Statement [Line Items] Pretax charge on a Canadian project Change In Accounting Estimate, Financial Effect, Operating Income Change In Accounting Estimate, Financial Effect, Operating Income Income tax adjustment amount related to current year Income Tax Adjustment Current Year Income tax adjustment current year. Income tax adjustment amount for prior fiscal years Income Tax Adjustment Prior Years Income tax adjustment prior years. Income tax adjustment amount related to fourth quarter Income Tax Adjustment Fourth Quarter Income tax adjustment fourth quarter. Accounts receivable, allowances Allowance for Doubtful Accounts Receivable, Current Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Treasury stock, shares Treasury Stock, Shares Schedule of Goodwill [Table] Schedule of Goodwill [Table] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Electrical Infrastructure [Member] Electrical Infrastructure [Member] Electrical infrastructure. Oil Gas & Chemical [Member] Oil Gas And Chemical [Member] Oil gas & chemical. Storage Solutions [Member] Storage Solutions [Member] Storage solutions. Industrial [Member] Industrial [Member] Industrial. Goodwill [Line Items] Goodwill [Line Items] Carrying value of goodwill by segment Goodwill [Roll Forward] Goodwill Goodwill, Gross Cumulative impairment loss Goodwill, Impaired, Accumulated Impairment Loss Net Goodwill Acquisition related adjustment Goodwill, Purchase Accounting Adjustments Purchase of Pelichem Goodwill, Acquired During Period Translation adjustment Goodwill, Translation Adjustments Net Goodwill Business Combinations [Abstract] Purchase price allocation Schedule of Purchase Price Allocation [Table Text Block] Accounting Policies [Abstract] Schedule of Property, Plant and Equipment [Table] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Building [Member] Building [Member] Construction Equipment [Member] Equipment [Member] Transportation Equipment [Member] Transportation Equipment [Member] Office Equipment and Software [Member] Furniture and Fixtures [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Depreciable life of office equipment and software Property, Plant and Equipment, Useful Life Summary of Significant Accounting Policies (Textual) [Abstract] Summary Of Significant Accounting Policies (Textual) [Abstract] Summary of significant accounting policies. Restricted cash Restricted Cash and Cash Equivalents Account receivables Contract Receivable Retainage, Due in Next Twelve Months Other assets Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected after Next Twelve Months Accounts payable Retention Payable Net income Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustments (net of tax of $190, $214 and ($333)) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Stock option activity and related information Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of options outstanding at June 30, 2012 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Number of options granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Number of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of options cancelled Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Number of options outstanding at June 30, 2013 Number of options vested or expected to vest at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Number of options exercisable at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual life vested or expected to vest at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual life exercisable at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Weighted average exercise price at June 30, 2012 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average exercise price granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted average exercise price exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price cancelled Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Weighted average exercise price at June 30, 2013 Weighted average exercise price vested or expected to vest at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Weighted average exercise price exercisable at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Aggregate intrinsic value exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Aggregate intrinsic value outstanding at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value vested or expected to be vest at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Aggregate intrinsic value exercisable at June 30, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Acquisitions Business Combination Disclosure [Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Range One [Member] Range One [Member] Range one. Range Two [Member] Range Two [Member] Range two. Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Stock options information Schedule of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Abstract] Schedule of share based compensation shares authorized under stock option plans by exercise price range. Range of exercise price lower limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Range of exercise price upper limit Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Stock options outstanding, option outstanding Stock options outstanding weighted average exercise price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Stock options outstanding weighted average remaining contractual life Stock options exercisable option outstanding Stock options exercisable weighted average exercise price Stock options exercisable weighted average remaining contractual life Multiemployer Pension Plans Schedule of Multiemployer Plans [Table Text Block] Nonvested deferred share activity Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested shares at June 30, 2012 Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Shares granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Shares vested and released Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Shares cancelled Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested shares at June 30, 2013 Weighted average grant date fair value per share at June 30, 2012 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 per share granted 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 per share vested and released 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 per share cancelled 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 per share at June 30, 2013 Components of the provision for income taxes Income Tax Expense (Benefit), Continuing Operations [Abstract] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total Current Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Total Deferred Income Tax Expense (Benefit) Provision for income taxes Commitments and Contingencies Disclosure [Abstract] Claims related to unapproved change orders Accounts Receivable, Unapproved Contract Claims Significant components of Company's deferred tax assets and liabilities Components of Deferred Tax Assets and Liabilities [Abstract] Deferred tax assets: Components of Deferred Tax Assets [Abstract] Bad debt reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Paid time-off accrual Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences Insurance reserve Deferred Tax Assets Insurance Reserve Deferred tax assets insurance reserve. Legal reserve Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Legal Settlements Net operating loss benefit and credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards Valuation allowance Deferred Tax Assets, Valuation Allowance Accrued compensation and pension Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions Stock compensation expense on nonvested deferred shares Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Accrued losses Deferred Tax Assets Accrued Losses Deferred tax assets accrued losses. Other-net Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Tax over book depreciation Deferred Tax Liabilities, Property, Plant and Equipment Tax over book amortization Deferred Tax Liabilities, Goodwill Prepaid insurance Deferred Tax Liabilities, Prepaid Expenses Other-net Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax liability Deferred Tax Assets, Net Debt Disclosure [Abstract] Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Schedule of Acquired Indefinite-lived Intangible Assets by Major Class [Table] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] [Domain] for Variable Rate [Axis] CDOR Rate [Member] CDOR Rate [Member] CDOR Rate [Member] Canadian Prime Rate [Member] Canadian Prime Rate [Member] Canadian Prime Rate [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Spread on variable rate basis (percent) Debt Instrument, Basis Spread on Variable Rate Unused Credit Facility Fee Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint Line Of Credit Facility Maximum Borrowing Capacity After Consideration Of Capacity Constraint Line of credit facility maximum borrowing capacity after consideration of capacity constraint. Debt (Textual) [Abstract] Debt (Textual) [Abstract] Debt. Senior secured revolving credit facility Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Expiration Date Line of Credit Facility, Expiration Date Limit on asset dispositions Amount Of Limit On Asset Dispositions Amount of limit on asset dispositions. Additional Margin on LIBOR loans, Minimum Line Of Credit Basis Spread On London Interbank Offered Rate Minimum Line of credit basis spread on London interbank offered rate minimum. Additional Margin on LIBOR loans, Maximum Line Of Credit Basis Spread On London Interbank Offered Rate Maximum Line of credit basis spread on London interbank offered rate maximum. Additional Margin on alternate base rate loans, Minimum Line Of Credit Basis Spread On Alternate Base Rate Minimum Line of credit basis spread on alternate base rate minimum. Additional Margin on alternate base rate loans, Maximum Line Of Credit Basis Spread On Alternate Base Rate Maximum Line of credit basis spread on alternate base rate maximum. Senior Leverage Ratio, Maximum Senior Leverage Ratio Maximum Senior leverage ratio maximum. Senior Leverage Ratio, Minimum Senior Leverage Ratio Minimum Senior leverage ratio minimum. Fixed Charge Coverage Ratio, Maximum Fixed Charge Coverage Ratio Maximum Fixed charge coverage ratio maximum. Fixed Charge Coverage Ratio, Minimum Fixed Charge Coverage Ratio Minimum Fixed charge coverage ratio minimum. Maximum limit of consolidated funded indebtedness Maximum Limit Of Consolidated Funded Indebtedness Maximum limit of consolidated funded indebtedness. Consolidated EBITDA as defined in the Credit Agreement Consolidated Earnings Before Interest Taxes Depreciation And Amortization Per Credit Agreement Consolidated earnings before interest taxes depreciation and amortization per credit. Consolidated Funded Indebtedness Consolidated Funded Indebtedness Consolidated Funded Indebtedness Additional Margin on CDOR loans, Minimum Line Of Credit Basis Spread On Canadian Deposit Offered Rate Minimum Line of credit basis spread on Canadian deposit offered rate minimum. Additional Margin on CDOR loans, Maximum Line Of Credit Basis Spread On Canadian Deposit Offered Rate Maximum Line of credit basis spread on Canadian deposit offered rate maximum. Additional Margin on Canadian prime rate loans, Minimum Line Of Credit Basis Spread On Canadian Prime Rate Minimum Line of credit basis spread on Canadian prime rate minimum. Additional Margin on Canadian prime rate loans, Maximum Line Of Credit Basis Spread On Canadian Prime Rate Maximum Line of credit basis spread on Canadian prime rate maximum. CDOR Rate description Line Of Credit Facility Canadian Deposit Offered Rate Description Line of credit facility Canadian deposit offered rate description. Canadian prime rate description Line Of Credit Facility Canadian Prime Rate Description Line of credit facility Canadian prime rate description. Sublimit on Canadian dollar borrowings Amount Of Limit On Canadian Dollar Borrowings Amount of limit on Canadian dollar borrowings. Leases [Abstract] Leases Leases of Lessee Disclosure [Text Block] Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts 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 Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date 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 Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Earnings Per Share [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Earnings Per Share, Basic and Diluted [Abstract] Basic EPS: Earnings Per Share, Basic [Abstract] Weighted average shares outstanding Basic EPS Diluted EPS: Earnings Per Share, Diluted [Abstract] Dilutive stock options Incremental Common Shares Attributable to Share-based Payment Arrangements Dilutive nonvested deferred shares Incremental Common Shares Attributable to Nonvested Shares with Forfeitable Dividends Diluted weighted average shares Diluted EPS 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 [Member] Stock Options [Member] Nonvested Deferred Shares [Member] Nonvested Deferred Shares [Member] Nonvested Deferred Shares [Member] 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 Diluted Earnings Per Share Antidilutive Securities Excluded From Computation Of Diluted Earnings Per Share [Abstract] Antidilutive securities excluded from computation of diluted earnings per share. Total antidilutive securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Components of pretax income Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Assumptions used to calculate grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Grant date fair value 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 life in years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Contingencies Commitments and Contingencies Disclosure [Text Block] Organization and Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Precontract Costs Precontract Costs, Policy [Policy Text Block] Change Orders and Claims Recognition Change Orders And Claims Recognition [Policy Text Block] Disclosure of accounting policy for change orders and the recognition of claims. Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Receivables, Policy [Policy Text Block] Retentions Retention Payable [Policy Text Block] Retention payable. Loss Contingencies Commitments and Contingencies, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Depreciation Depreciation, Depletion, and Amortization [Policy Text Block] Internal Use Computer Software Internal Use Software, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Other Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Insurance Reserves Insurance Reserves [Policy Text Block] Disclosure of accounting policy for insurance reserves. Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Contractors [Abstract] Customer Contracts Long-term Contracts or Programs Disclosure [Text Block] Expiration period of carry forwards Operating Loss Carryforwards, Expiration Dates Change in valuation allowance Valuation Allowance, Deferred Tax Asset, Change in Amount Unremitted earnings Undistributed Earnings of Foreign Subsidiaries Deferred tax liability Deferred Tax Liabilities, Undistributed Foreign Earnings Earnings per Common Share Earnings Per Share [Text Block] Future minimum operating lease payable, in total Operating Leases, Future Minimum Payments Due Minimum operating lease payable, Fiscal 2014 Operating Leases, Future Minimum Payments Due, Next Twelve Months Minimum operating lease payable, Fiscal 2015 Operating Leases, Future Minimum Payments, Due in Two Years Minimum operating lease payable, Fiscal 2016 Operating Leases, Future Minimum Payments, Due in Three Years Minimum operating lease payable, Fiscal 2017 Operating Leases, Future Minimum Payments, Due in Four Years Minimum operating lease payable, Fiscal 2018 Operating Leases, Future Minimum Payments, Due in Five Years Minimum operating lease payable, Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Operating lease expense Operating Leases, Rent Expense Stockholders' Equity Note [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Sales Revenue, Services, Net Gross Profit Operating Income (Loss) Net Income (Loss) Attributable to Parent Gross and net amount of uncompleted contracts Receivables, Long-term Contracts or Programs [Abstract] Costs and estimated earnings recognized on uncompleted contracts Uncompleted Contracts Costs Incurred And Estimated Earnings Recognized Uncompleted contracts costs incurred and estimated earnings recognized. Billings on uncompleted contracts Uncompleted Contracts Billings Uncompleted contracts billings. Total Uncompleted Contracts Net Uncompleted contracts. Shown on balance sheet as: Balance Sheet Balance sheet. Billings on uncompleted contracts in excess of costs and estimated earnings Total Costs in Excess of Billings on Uncompleted Contracts or Programs Debt Debt Disclosure [Text Block] Goodwill and Other Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Matrix Service Company's 2004 Stock and Incentive Compensation Plan [Member] Matrix Service Company's 2004 Stock and Incentive Compensation Plan [Member] Matrix Service Company's 2004 Stock and Incentive Compensation Plan (2004 Plan) [Member] Matrix Service Company's 2012 Stock and Incentive Compensation Plan [Member] Matrix Service Company's 2012 Stock and Incentive Compensation Plan [Member] Matrix Service Company's 2012 Stock and Incentive Compensation Plan (2012) [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Market Based Awards [Member] Market Based Awards [Member] Market based awards. Type of Deferred Compensation [Axis] Type of Deferred Compensation [Axis] Type of Deferred Compensation, All Types [Domain] Type of Deferred Compensation, All Types [Domain] Employee Award [Member] Employee Award [Member] Employee Award. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Expense originally reversed Share-based Compensation Unrecognized stock-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized Unrecognized stock-based compensation expense related to nonvested deferred shares Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options Unrecognized stock-based compensation expense related to stock options Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options Weighted average period Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Stock based compensation expense recognized tax Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Share awards authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share awards grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Common stock grant expiration term Share Based Compensation Arrangement By Share Based Payment Award Expiration Period Share based compensation arrangement by share based payment award expiration period. Total intrinsic value of stock option Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Vesting period, equal annual installments Share Based Compensation Arrangement By Share Based Payment Award Installment Period For Vesting Share based compensation arrangement by share based payment award installment period for vesting. Vesting period of director awards Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period of Director Awards Share based compensation arrangement by share based payment award award vesting period of director awards. Description of vesting period of director awards Share Based Compensation Arrangement By Share Based Payment Award Award Description of Vesting Period of Director Awards Share based compensation arrangement by share based payment award award description of vesting period of director award. Pro-rate of original awards, minimum Payout As Percentage Of Original Award Minimum Payout as percentage of original award minimum. Pro-rate of original awards maximum Payout As Percentage Of Original Award Maximum Payout as percentage of original award maximum. Minimum threshold shares scheduled to vest for performance based shares Minimum Threshold Shares Scheduled To Vest For Performance Based Shares Minimum threshold shares scheduled to vest for performance based shares. Deferred shares granted Share Based Compensation Arrangement By Share Based Payment Award Deferred Grants In Period Share based compensation arrangement by share based payment award deferred grants in period. Average grant date fair value Share Based Compensation Arrangement By Share Based Payment Award Deferred Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award deferred weighted average grant date fair value. Deferred shares vested and released Share Based Compensation Arrangement By Share Based Payment Award Deferred Shares Vested And Released Share based compensation arrangement by share based payment award deferred shares vested and released. Weighted average fair value Share Based Compensation Arrangement By Share Based Payment Award Deferred Shares Vested And Released Weighted Average Grant Date Fair Value Share based compensation arrangement by share based payment award deferred shares vested and released weighted average grant date fair value. Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Share Based Compensation Arrangement By Share Based Payment Award Fair Value Method Number of Simulations Used Availability under senior credit facility Line of Credit Facility [Abstract] Senior credit facility Capacity constraint due to the Senior Leverage Ratio Capacity Constraint Due To Senior Leverage Ratio Capacity constraint due to the Senior Leverage Ratio. Capacity under the credit facility Letters of credit issued Letters Of Credit Issued Letters of credit issued. Availability under the senior credit facility Line of Credit Facility, Remaining Borrowing Capacity Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Unallocated Corporate [Member] All Other Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Results of Operations Segment Reporting Information, Profit (Loss) [Abstract] Gross revenues Revenues Less: Inter-segment revenues Segment Reporting Information, Intersegment Revenue Gross profit Operating income (loss) Segment assets Capital expenditures Payments to Acquire Property, Plant, and Equipment Depreciation and amortization Depreciation, Depletion and Amortization Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Treasury Stock [Member] Treasury Stock [Member] Exercise of stock options, shares Issuance of deferred shares, shares Deferred Shares Issued Deferred Shares Issued Employee Stock Purchase Plans, shares Stock Issued During Period, Shares, Employee Stock Purchase Plans Open market purchase of treasury shares, shares Treasury Stock, Shares, Acquired Other treasury share purchases Other Treasury Shares Acquired Other treasury shares acquired. Stock option activity and related information Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Assumptions used to calculate grant date fair value Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Stock options information Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Nonvested deferred share activity Schedule of Nonvested Share Activity [Table Text Block] Significant components of Company's deferred tax assets and liabilities as reported in consolidated balance sheets Deferred Tax Assets, Net, Classification [Abstract] Current deferred tax assets Non-current deferred tax liabilities Net deferred tax liability Deferred Tax Liabilities, Net Income Taxes Income Tax Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] EDC [Member] EDC [Member] EDC. Business Acquisition [Line Items] Business Acquisition [Line Items] Acquisitions (Textual) [Abstract] Acquisitions (Textual) [Abstract] Acquisitions. Cash payment for asset Business Acquisition, Cost of Acquired Entity, Cash Paid Additional incentive payment Business Acquisition, Contingent Consideration, Potential Cash Payment Financial targets achievement period Business Acquisition Target Achievement Period Business acquisition target achievement period. Asset purchase price Business Acquisition, Cost of Acquired Entity, Purchase Price Carrying value of the acquisition payable and selling, general and administrative costs Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Goodwill, Purchase Accounting Adjustments Multiemployer Plan Zone By Type [Axis] Multiemployer Plan Zone By Type [Axis] Multiemployer plan zone by type. Multiemployer Plan Zone By Type [Domain] Multiemployer Plan Zone By Type [Domain] Multiemployer plan zone by type. Zone Red [Member] Zone Red [Member] Zone red. Zone Yellow [Member] Zone Yellow [Member] Zone yellow. Zone Green [Member] Zone Green [Member] Zone green. Percentage of plan funded Percentage of Plan Funded Percentage of plan funded. Description of plans funded Description of Funded Portion of Plan Description of funded portion of plan. Employee Benefit Plans (Textual) [Abstract] Employee Benefit Plans (Textual) [Abstract] Employee benefit plans. Percentage of limitation on pretax compensation Defined Contribution Plan Maximum Annual Contribution by Employee Percent Maximum percentage of employee gross pay, by the terms of the plan, that the employee may contribute to a defined contribution plan. Company match of first 3% of employee contributions Defined Contribution Plan, Employer Matching Contribution, Percent Percentage of employee contribution for first half Percentage Of Employee Contribution As Base For Employer Contributions Percentage of employee contribution as base for employer contributions. Employee contribution for next 2% Defined Contribution Plan Employer Matching Contribution Percent For Two percent of Employee Contribution Defined contribution plan employer matching contribution percent for next two percent of employee contribution. Percentage of employee contribution for next half Percentage of Employee Contribution As Base for Employer Contribution to Match Percentage of employee contribution as base for employer contribution to match Contribution made by company Defined Contribution Plan, Cost Recognized Employee share purchase limit aggregate market value Employee Stock Purchase Plan Maximum Annual Share Purchase Limited To Aggregate Market Value Employee stock purchase plan per participant maximum annual share purchase limited to aggregate market value. Shares available at ESPP Employee Stock Purchase Plan Maximum Number Of Shares Available For Issuance Employee stock purchase plan maximum number of shares available for issuance. Employee Stock Purchase Plan, Termination Date Employee Stock Purchase Plan, Termination Date Employee Stock Purchase Plan, Termination Date Shares issued under ESPP Computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of antidilutive securities excluded from computation of diluted earnings per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Customer Based [Member] Pelichem Industrial Cleaning Services, LLC [Member] Pelichem Industrial Cleaning Services, LLC [Member] Pelichem Industrial Cleaning Services, LLC [Member] Finite-Lived Intangible Asset, Useful Life Impairment of Intangible Assets, Finite-lived Impairment of Intangible Assets, Finite-lived Goodwill and Other Intangible Assets (Textual) [Abstract] Goodwill and Other Intangible Assets (Textual) [Abstract] Goodwill and other intangible assets. Amortization expense Amortization of Intangible Assets 2014 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Five Difference between expected income tax provision applying domestic federal statutory tax rate and reported income tax provision Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] Expected provision for Federal income taxes at the statutory rate Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate State income taxes, net of Federal benefit Income Tax Reconciliation, State and Local Income Taxes Charges without tax benefit Income Tax Reconciliation Charges Without Tax Benefit Income Tax Reconciliation, Charges without tax benefit Change in valuation allowance Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance Cumulative non-deductible expenses Income Tax Reconciliation Cumulative Non Deductible Expenses Income Tax Reconciliation, Cumulative non deductible expenses IRS S199 deduction Income Tax Reconciliation, Deductions, Qualified Production Activities Research & Development Credit Income Tax Reconciliation, Tax Credits, Research Foreign tax differential Income Tax Reconciliation, Foreign Income Tax Rate Differential Other Income Tax Reconciliation, Other Adjustments Statement of Cash Flows [Abstract] Operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities, net of effects of acquisitions : Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation expense Deferred income taxes Deferred Income Tax Expense Benefit Socf Deferred income tax expense benefit socf. Allowance for uncollectible accounts Provision for Doubtful Accounts (Gain) loss on sale of property, plant and equipment Gain (Loss) on Sale of Property Plant Equipment Other Other Noncash Income (Expense) Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Costs and estimated earnings in excess of billings on uncompleted contracts Increase Decrease In Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts Increase Decrease In Costs And Estimated Earnings In Excess Of Billings On Uncompleted Contracts Inventories Increase (Decrease) in Inventories Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Billings on uncompleted contracts in excess of costs and estimated earnings Increase (Decrease) in Billing in Excess of Cost of Earnings Accrued expenses Increase (Decrease) in Accrued Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Acquisition of property, plant and equipment Acquisition Payments to Acquire Businesses, Net of Cash Acquired Acquisition related adjustment Acquisition Related Adjustment for Final Working Capital Settlement Acquisition related adjustment for the final working capital settlement. Proceeds from asset sales Proceeds from Sale of Productive Assets Net cash used for investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Exercise of stock options Proceeds from Stock Options Exercised Capital lease payments Repayments of Long-term Capital Lease Obligations Excess tax benefit of exercised stock options and vesting of deferred shares Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities Advances under credit agreement Proceeds from Long-term Lines of Credit Repayments of advances under credit agreement Repayments of Long-term Lines of Credit Payment of debt amendment fees Payments of Debt Issuance Costs Treasury shares sold to Employee Stock Purchase Plan Proceeds from Stock Plans Open market purchase of treasury shares Payments for Repurchase of Common Stock Other treasury share purchases Payments for Repurchase of Other Equity Net cash used by financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Other cash flow information: Supplemental Cash Flow Information [Abstract] Income taxes Income Taxes Paid, Net Interest Interest Paid Non-cash investing: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Purchases of property, plant and equipment on account Capital Expenditures Incurred but Not yet Paid Schedule of Quarterly Financial Data (Unaudited) Schedule of Quarterly Financial Information [Table Text Block] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Customer One [Member] Customer One [Member] Customer one. Customer Two [Member] Customer Two [Member] Customer two. Customer Three [Member] Customer Three [Member] Customer three. Customer Four [Member] Customer Four [Member] Customer four. Another Customer [Member] Another Customer [Member] Another customer. Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Percentage of Revenue Entity-Wide Revenue, Major Customer, Percentage S.M. Electric Company [Member] S.M. Electric Company [Member] S.M. Electric Company [Member] SME [Member] SME [Member] SME. Record amount of claims Business Combination Claim Settlement Receivables Business combination claim settlement receivables. Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected in Next Rolling Twelve Months Contracts Receivable, Claims and Uncertain Amounts, Expected to be Collected in Next Rolling Twelve Months Change In Accounting Estimate, Financial Effect, Net Income Change In Accounting Estimate, Financial Effect, Net Income Change In Accounting Estimate, Financial Effect, Net Income Change In Accounting Estimate, Financial Effect, Diluted Earnings Per Share Change In Accounting Estimate, Financial Effect, Diluted Earnings Per Share Change In Accounting Estimate, Financial Effect, Diluted Earnings Per Share Loss Contingency, Damages Awarded, Value Loss Contingency, Damages Awarded, Value Loss Contingency Accrual, Carrying Value, Period Increase (Decrease) Loss Contingency Accrual, Carrying Value, Period Increase (Decrease) 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 [Member] Allowance for Doubtful Accounts [Member] Valuation Allowance of Deferred Tax Assets [Member] Valuation Allowance of Deferred Tax Assets [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of Period Valuation Allowances and Reserves, Balance Charged to Costs and Expenses Valuation Allowances and Reserves, Charged to Cost and Expense Charged to Other Accounts Valuation Allowances and Reserves, Charged to Other Accounts Deductions Valuation Allowances and Reserves, Deductions Balance at End of Period Gross and net amount of uncompleted contracts Gross And Net Amount Of Uncompleted Contracts Table [Text Block] Gross and net amount of uncompleted contracts. Availability under the senior credit facility Schedule of Line of Credit Facilities [Table Text Block] Preferred stock shares authorized Preferred Stock, Shares Authorized Preferred stock shares issued Preferred Stock, Shares Issued Preferred stock shares outstanding Preferred Stock, Shares Outstanding Purchase of common stock on stock buyback program Stock Repurchase Program, Number of Shares Authorized to be Repurchased Annual maximum purchases authorized under stock buyback program Stock Repurchase Program, Authorized Amount Common stock shares withheld Shares Paid for Tax Withholding for Share Based Compensation Purchase price allocation Business Acquisition, Purchase Price Allocation [Abstract] Current assets Business Acquisition, Purchase Price Allocation, Current Assets Property, plant and equipment Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment Tax deductible goodwill Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount Other intangible assets Business Acquisition, Purchase Price Allocation, Intangible Assets Other than Goodwill Total assets acquired Business Acquisition, Purchase Price Allocation, Assets Acquired Current liabilities Business Acquisition, Purchase Price Allocation, Current Liabilities Net assets acquired Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net Cash acquired Business Acquisition, Purchase Price Allocation, Current Assets, Cash and Cash Equivalents Net purchase price Common Stock Common Stock [Member] Additional Paid-In Capital Retained Earnings Treasury Stock Accumulated Other Comprehensive Income(Loss) Accumulated Other Comprehensive Income (Loss) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balances Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Exercise of stock options (97,840; 26,500 and 32,000 shares in 2013, 2012 and 2011 respectively) Stock Issued During Period, Value, Stock Options Exercised Tax effect of exercised stock options and vesting of deferred shares Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Issuance of deferred shares (367,449; 184,149 and 126,428 shares in 2013, 2012 and 2011 respectively) Issuance Of Deferred Shares Issuance of deferred shares. Employee Stock Purchase Plan (4,452; 4,395 and 699 shares in 2013, 2012 and 2011 respectively) Stock Issued During Period, Value, Employee Stock Purchase Plan Open market purchase of treasury shares (886,503 shares in 2012) Treasury Stock, Value, Acquired, Cost Method Other treasury share purchases (107,344; 52,992 and 30,154 shares in 2013, 2012 and 2011 respectively) Other Treasury Share Purchases Other treasury share purchases. Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Balances Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Segment, Geographical [Domain] Domestic [Member] Domestic [Member] Domestic. International [Member] International [Member] International. Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Summary of revenues and long lived assets according to geographic areas Schedule Of Segment Reporting Information By Geographic Areas [Abstract] Schedule of segment reporting information by geographic areas. Long-Lived Assets Long-Lived Assets