Disclosure Customer Contracts Additional Information [Abstract] Disclosure - Customer Contracts - Additional Information [Abstract] Uncompleted Contracts Long-term Contracts or Programs Disclosure [Text Block] 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 [Domain] Variable Rate [Domain] CDOR Rate [Member] CDOR Rate [Member] CDOR Rate [Member] Canadian Prime Rate [Member] Canadian Prime Rate [Member] Canadian Prime Rate [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Acquired Indefinite-lived Intangible Assets [Line Items] Acquired Indefinite-lived Intangible Assets [Line Items] Credit Agreement Term Credit Agreement Term Credit Agreement Term Senior secured revolving credit facility Line of Credit Facility, Maximum Borrowing Capacity mtrx_LineOfCreditFacilityExpirationDate mtrx_LineOfCreditFacilityExpirationDate Credit Facility Expiration Date Senior Leverage Ratio, Maximum Senior Leverage Ratio Max Senior Leverage Ratio Max Senior Leverage Ratio, Minimum Senior Leverage Ratio Min 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. Limit on asset dispositions mtrx_Amount Of Limit On Asset Dispositions Amount Of Limit On Asset Dispositions over a 12 month period 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. 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. Sublimit on Canadian dollar borrowings Amount Of Limit On Canadian Dollar Borrowings Amount of limit on Canadian dollar borrowings. 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. Variable rate basis Debt Instrument, Description of Variable Rate Basis Basis spread on variable rate basis Debt Instrument, Basis Spread on Variable Rate Canadian prime rate description Line Of Credit Facility Canadian Prime Rate Description Line of credit facility Canadian prime rate description. Unused Credit Facility Fee Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 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 Business Combinations [Abstract] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] HDB, Inc. [Member] HDB, Inc. [Member] HDB, Inc. [Member] Kvaerner NAC Kvaerner North American Construction [Member] Kvaerner North American Construction [Member] Pelichem Pelichem Industrial Cleaning Services, LLC [Member] Pelichem Industrial Cleaning Services, LLC [Member] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Schedule of Preliminary Purchase Price Allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Segment Reporting [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Intersegment Eliminations [Member] Intersegment Eliminations [Member] Business Segments [Axis] Segments [Axis] Segments [Domain] Segments [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. Other Segments [Member] Other Segments [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Gross revenues Revenues Consolidated revenues Sales Revenue, Services, Net Gross profit Gross Profit Operating income Operating Income (Loss) Segment assets Assets Goodwill Goodwill Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-In Capital Additional Paid-in Capital [Member] Treasury Stock Treasury Stock [Member] Statement [Line Items] Statement [Line Items] Exercise of stock options, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Employee Stock Purchase Plan, shares Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of deferred shares, shares Deferred Shares Issued Deferred Shares Issued Other treasury shares purchases, shares Other Treasury Shares Acquired Other treasury shares acquired. Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Earnings Per Share [Abstract] 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] Employee Stock Option [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] Total antidilutive securities Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Acquisitions Business Combination Disclosure [Text Block] Income Statement [Abstract] Revenues Cost of revenues Cost of Services Gross profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income 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), Including Portion Attributable to Noncontrolling Interest Less: Net loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to Matrix Service Company Net Income (Loss) Attributable to Parent Basic earnings per common share (US$ per share) Earnings Per Share, Basic Diluted earnings per common share (US$ per share) Earnings Per Share, Diluted Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (shares) Weighted Average Number of Shares Outstanding, Basic Diluted (shares) Weighted Average Number of Shares Outstanding, Diluted Statement of Comprehensive Income [Abstract] Net income Other comprehensive loss, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Comprehensive loss attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income attributable to Matrix Service Company Comprehensive Income (Loss), Net of Tax, Attributable to Parent Statement Condensed Consolidated Balance Sheets [Abstract] Statement Condensed Consolidated Balance Sheets [Abstract] 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 Availability Under the Senior Credit Facility Schedule of Line of Credit Facilities [Table Text Block] Expected Remaining Amortization Expense [Abstract] Expected Remaining Amortization Expense [Abstract] 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] Segments [Axis] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Senior credit facility Capacity Constraint Due To Senior Leverage Ratio Capacity Constraint Due To Senior Leverage Ratio Capacity constraint due to the Senior Leverage Ratio. 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. Line of Credit Facility, Amount Outstanding Long-term Line of Credit Letters of credit subject to the credit facility Letters Of Credit Subject To Credit Facility Letters Of Credit Subject To Credit Facility. Availability under the senior credit facility Line of Credit Facility, Remaining Borrowing Capacity Goodwill and Intangible Assets Disclosure [Abstract] Intellectual Property [Member] Intellectual Property [Member] Customer Relationships [Member] Customer Relationships [Member] Noncompete Agreements [Member] Noncompete Agreements [Member] Trade Names [Member] Trade Names [Member] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Carrying Amount Indefinite Trade Names Indefinite-Lived Trade Names Total intangible assets, net carrying amount Intangible Assets, Net (Excluding Goodwill) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 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 (used) by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Deferred income tax Deferred Income Tax Expense (Benefit) Gain on sale of property, plant and equipment Gain (Loss) on Disposition of Property Plant Equipment Provision for uncollectible accounts Provision for Doubtful Accounts Stock-based compensation expense Share-based Compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Excess Tax Benefit from Share-based Compensation, Operating Activities 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 Cost in Excess of Billing on Uncompleted Contract Inventories Increase (Decrease) in Inventories Other assets and liabilities 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 (used) 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 Payments to Acquire Property, Plant, and Equipment Acquisition, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Proceeds from asset sales Proceeds from Sale of Productive Assets Net cash used by investing activities Net Cash Provided by (Used in) Investing Activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from Noncontrolling Interests Proceeds from Noncontrolling Interests Issuances of common stock Proceeds from Issuance of Common Stock Excess tax benefit of exercised stock options and vesting of deferred shares Excess Tax Benefit from Share-based Compensation, Financing Activities Payments of Debt Issuance Costs Payments of Debt Issuance Costs Advances under credit agreement Proceeds from Long-term Lines of Credit Repayments of advances under credit agreement Repayments of Long-term Lines of Credit Proceeds from issuance of common stock under employee stock purchase plan Proceeds from Stock Plans Repurchase of common stock for payment of statutory taxes due on equity-based compensation Payments for Repurchase of Other Equity Net cash provided (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 decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents, end of period Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Income taxes Income Taxes Paid, Net Interest Interest Paid Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Purchases of property, plant and equipment on account Capital Expenditures Incurred but Not yet Paid Unapproved change orders Unapproved Change Orders, Amount Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Antidilutive Securities Excluded from the Calculation of Diluted EPS Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] 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 [Text Block] Schedule of intangible assets excluding goodwill. Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Name of Acquired Entity Business Acquisition, Name of Acquired Entity Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Business Acquisition, Goodwill, Expected Tax Deductible Amount Business Acquisition, Goodwill, Expected Tax Deductible Amount Other intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Current liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Business Combination, Consideration Transferred Business Combination, Consideration Transferred Debt Debt Disclosure [Text Block] Business Acquisition, Effective Date of Acquisition Business Acquisition, Effective Date of Acquisition Tax deductible goodwill Results of Operations Schedule of Segment Reporting Information, by Segment [Table Text Block] Impairment charge Goodwill, Impairment Loss Amortization expense Amortization of Intangible Assets Other Intangible Assets [Member] Other Intangible Assets [Member] SM Electric Trade Name [Member] SM Electric Trade Name [Member] SM Electric Trade Name [Member] Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Finite-lived Intangible Assets, Fair Value Disclosure Finite-lived Intangible Assets, Fair Value Disclosure Indefinite-Lived Trade Names Finite-Lived Trade Names, Gross Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill, Purchase Accounting Adjustments Goodwill, Purchase Accounting Adjustments Goodwill, Acquired During Period Goodwill, Acquired During Period Goodwill Goodwill, Gross Cumulative impairment loss Goodwill, Impaired, Accumulated Impairment Loss Goodwill Goodwill [Roll Forward] Goodwill [Roll Forward] Net balance at June 30, 2015 Translation adjustment Goodwill, Translation Adjustments Net balance at September 30, 2015 Income Tax Disclosure [Abstract] Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Earnings per Common Share Earnings Per Share [Text Block] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol 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 Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, less allowances (September 30, 2015— $895 and June 30, 2015—$561) Accounts Receivable, Net, Current Costs and estimated earnings in excess of billings on uncompleted contracts Costs in Excess of Billings, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Inventories Inventory, Net Income taxes receivable Income Taxes Receivable, 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 Buildings and Improvements, Gross Construction equipment Machinery and Equipment, Gross Transportation equipment Transportation Equipment Gross Transportation Equipment Gross Office equipment and software Furniture and Fixtures, 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 Other intangible assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Other assets Other Assets, Noncurrent Total 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 Deferred Tax Liabilities, Net, Current Deferred Tax Liabilities, Net, Current Other accrued expenses Other Liabilities, Current Total current liabilities Liabilities, Current Deferred income taxes - noncurrent Deferred Tax Liabilities, Net, Noncurrent Borrowings under senior credit facility Long-term Debt, Excluding Current Maturities Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Matrix Service Company 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 September 30, 2015, and June 30, 2015; 26,531,657 and 26,440,823 shares outstanding as of September 30, 2015 and June 30, 2015 Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Matrix Service Company stockholders' equity Stockholders' Equity before Treasury Stock Less: Treasury stock, at cost— 1,356,560 shares as of September 30, 2015, and 1,447,394 shares as of June 30, 2015 Treasury Stock, Value Total Matrix Service Company stockholders’ equity 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 Common Stock Common Stock [Member] Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Noncontrolling Interest Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Noncontrolling Interest, Increase from Subsidiary Equity Issuance Noncontrolling Interest, Increase from Subsidiary Equity Issuance Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Payments to Acquire Interest in Joint Venture Payments to Acquire Interest in Joint Venture Noncontrolling interest of consolidated joint venture Noncontrolling Interest, Increase from Business Combination Exercise of stock options 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 Adjustments to Additional Paid in Capital, Other Treasury shares sold to Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Other treasury share purchases 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 Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Income Taxes Income Tax Disclosure [Text Block] Gross and Net Amount of Uncompleted Contracts Gross And Net Amount Of Uncompleted Contracts Table [Text Block] Gross and net amount of uncompleted contracts. Customer Contracts [Table] Customer Contracts [Table] Customer Contracts [Table] Major Customers [Axis] Customer [Axis] Name of Major Customer [Domain] Customer [Domain] S.M. Electric Company S.M. Electric Company [Member] S.M. Electric Company [Member] Customer Contracts [Line Items] Customer Contracts [Line Items] [Line Items] for Customer Contracts [Table] Contract Receivable Retainage, Due in Next Twelve Months Contract Receivable Retainage, Next Twelve Months Contract Receivable Retainage, Due after Next Twelve Months Contract Receivable Retainage, after Next Twelve Months Estimate of the remaining amount to be collected Contracts Receivable, Claims and Uncertain Amounts Contract Receivable Contract Receivable Change In Accounting Estimate, Financial Effect, Operating Income Change In Accounting Estimate, Financial Effect, Operating Income Change In Accounting Estimate, Financial Effect, Operating Income Change in Accounting Estimate, Financial Effect, Net Income Change in Accounting Estimate, Financial Effect, Net Income Change in Accounting Estimate, Financial Effect, Net Income Intangible Assets Including Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Earnings Per Share, Basic [Abstract] Earnings Per Share, Basic [Abstract] Net income Weighted average shares outstanding - basic (shares) Basic EPS (US$ per share) Earnings Per Share, Diluted [Abstract] Earnings Per Share, Diluted [Abstract] Dilutive stock options Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Dilutive nonvested deferred shares Incremental Common Shares Attributable to Dilutive Effect of Nonvested Shares with Forfeitable Dividends Diluted weighted average shares (shares) Diluted EPS (US$ per share) Costs incurred 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. Total Costs in Excess of Billings