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Increase in valuation allowance Decrease in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] All Trading Arrangements All Trading Arrangements [Member] Gain on sale of division Gain on sale of non-core business Gain on sale Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal All Adjustments to Compensation All Adjustments to Compensation [Member] Depreciation and amortization Deferred Tax Liabilities Depreciation And Amortization Deferred tax liabilities depreciation and amortization. Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Common stock, par value $0.01; 30,000,000 shares authorized; 12,668,001 and 12,588,011 shares issued, respectively Common Stock, Value, Outstanding Award Timing Disclosures [Line Items] Cash and Investments Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Debt covenant, consolidated leverage ratio (less than) Debt Instrument, Covenant, Leverage Ratio, Maximum Allowed Debt Instrument, Covenant, Leverage Ratio, Maximum allowed Compensation Amount Outstanding Recovery Compensation Amount Reserve for accrued employee benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits Bad debt expense, net Accounts Receivable, Credit Loss Expense (Reversal) Forfeited (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 Amended And Restated Credit Agreement Amended And Restated Credit Agreement [Member] Amended And Restated Credit Agreement [Member] Deferred income tax provision Deferred Income Tax Expense (Benefit) Subsequent Event Type [Axis] Subsequent Event Type [Axis] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Bloomberg Short-Term Bank Yield Index Bloomberg Short-Term Bank Yield Index [Member] Bloomberg Short-Term Bank Yield Index Surety Bond Surety Bond [Member] Income Taxes Income Tax, Policy [Policy Text Block] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Work-in-progress Inventory, Work in Process, Gross Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Restricted stock issuable to eligible Board of Directors members annually (in shares) Share Based Compensation Arrangement By Share Based Payment Award Annual Shares Issuable Share-based compensation arrangement by share-based payment award annual shares issuable. Insider Trading Arrangements [Line Items] Credit Agreement Third Amendment Credit Agreement Third Amendment [Member] Credit Agreement Third Amendment Oil and gas (excludes petrochemical) Oil and Gas Service [Member] Mexico, Central and South America Mexico, Central America And South America [Member] Mexico, Central America And South America [Member] Stock-based compensation (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Dilutive effect of restricted stock units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Foreign rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Adjustment to Compensation, Amount Adjustment to Compensation Amount Vesting of Second Anniversary Share-Based Payment Arrangement, Tranche Two [Member] Proceeds from sale of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Cash collateral requirement for guarantees Credit Agreement, Cash Collateral Requirement for Guarantees, Period, Greater Than Credit Agreement, Cash Collateral Requirement for Guarantees, Period, Greater Than Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Deferred Tax Liabilities: Components of Deferred Tax Liabilities [Abstract] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] Auditor Name Auditor Name Document Period End Date Document Period End Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Adoption Date Trading Arrangement Adoption Date Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Less: Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Fair Value of Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Payments on industrial development revenue bonds Repayments of Long-Term Debt Treasury Stock Treasury Stock, Common [Member] Entity Central Index Key Entity Central Index Key Liabilities: Liabilities, Fair Value Disclosure [Abstract] Authorized plan extension period Share-Based Compensation Arrangement by Share-Based Payment Award, Authorized Plan Extension Period Share-Based Compensation Arrangement by Share-Based Payment Award, Authorized Plan Extension Period Compensation expense Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income tax provision (benefit) Total income tax provision (benefit) Income tax benefit Income Tax Expense (Benefit) Deferred compensation liability Deferred compensation Deferred Compensation Liability, Current and Noncurrent Non-deductible expenses Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Deferred compensation (Note J) Deferred Compensation Liability, Classified, Noncurrent Income Tax Authority [Domain] Income Tax Authority [Domain] Accrued compensation and benefits Employee-related Liabilities, Current Vesting Vesting [Axis] Fair Value Measurements Fair Value Disclosures [Text Block] Name Trading Arrangement, Individual Name Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Lender Name [Axis] Lender Name [Axis] Uniform capitalization and inventory Deferred Tax Assets Uniform Capitalization And Inventory Deferred tax assets uniform capitalization and inventory. Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Revenues Revenue Revenue from Contract with Customer, Excluding Assessed Tax Entity Entity [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Amendment Flag Amendment Flag Legal Entity Legal Entity [Axis] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Shares issued under the plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Assets: Assets, Fair Value Disclosure [Abstract] Maximum number of shares granted to any individual (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee Credit Facility Credit Facility [Domain] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Asset lives Property, Plant and Equipment, Useful Life Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Deferred tax rate differential Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Net contract asset (liability) Contract With Customer, Asset (Liability), Net, Current Contract with Customer, Asset (Liability), Net, Current Diluted (in shares) Weighted average diluted shares (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Contract Assets and Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Number of additional shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Deferred compensation plan Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member] Revenue Revenue from Contract with Customer [Text Block] Decreases related to settlement with taxing authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Failure to meet contractual commitments, reduction to revenue Change in contract estimates due to project cancellations Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Additional paid-in capital Additional Paid in Capital, Common Stock Additional Paid-in Capital Additional Paid-in Capital [Member] Document Annual Report Document Annual Report Balance Sheet Location [Axis] Balance Sheet Location [Axis] Total Assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Cover [Abstract] Change due to foreign currency translation Standard and Extended Product Warranty Accrual, Foreign Currency Translation Gain (Loss) Subsequent Event Subsequent Events [Text Block] Credit Agreement Second Amendment Credit Agreement Second Amendment [Member] Credit Agreement Second Amendment United States UNITED STATES Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Other long-term liabilities Other Liabilities, Noncurrent 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 Non-NEOs Non-NEOs [Member] Total future minimum lease payments Lessee, Operating Lease, Liability, to be Paid Supplemental Disclosures of Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Short-term investments Short-Term Investments Construction in process Construction in Progress [Member] Raw materials, parts and sub-assemblies Inventory, Raw Materials and Supplies, Gross Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Segment Information Segment Reporting Disclosure [Text Block] Non-PEO NEO Non-PEO NEO [Member] Equity Component Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Change in contract estimates related to projects in progress Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Net operating loss Deferred Tax Assets, Operating Loss Carryforwards Basic (in shares) Weighted average basic shares (in shares) Weighted Average Number of Shares Outstanding, Basic Letters of credit, collateral outstanding (not to be less than) Letter of Credit, Collateral Amount, Minimum Outstanding Letter of Credit, Collateral Amount, Minimum Outstanding Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Operating income Operating Income (Loss) Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Long-term contract beginning Long-term Contract, Period Long-term Contract, Period Traction power Traction Power Customer [Member] Traction Power Customer [Member] Deferred tax liabilities Deferred Tax Liabilities, Gross Revenue from External Customers by Products and Services [Table] Revenue from External Customers by Products and Services [Table] 2014 Director Plan Non Employee Director Equity Incentive Plan [Member] 2014 Non-Employee Director Equity Incentive Plan Member Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Operating Activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Statement [Line Items] Statement [Line Items] Standard assurance warranty period Standard Assurance Warranty, Period Standard Assurance Warranty, Period Property, Plant and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Guarantee liability, letters of credit Guarantor Obligations, Current Carrying Value Vesting of First Anniversary Share-Based Payment Arrangement, Tranche One [Member]