Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Intangible Assets, Net (Excluding Goodwill) [Abstract] Intangible Assets Intangible Assets Disclosure [Text Block] Provision (benefit) for income taxes Income Tax Expense (Benefit) Effective tax rate Effective Income Tax Rate, Continuing Operations Income (loss) before provision (benefit) for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Non-deductible goodwill impairment Income Tax Reconciliation, Nondeductible Expense, Impairment Losses Income Tax Examination [Table] Income Tax Examination [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) [Member] Income Tax Examination [Line Items] Income Tax Examination [Line Items] Decrease in tax provision due to tax settlement from audit Income Tax Reconciliation, Tax Settlements, Domestic Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Earnings Per Share [Abstract] Earnings (loss) Per Share Earnings Per Share [Text Block] Statement of Cash Flows [Abstract] Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss) Attributable to Parent Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Intangibles amortization and depreciation Depreciation, Depletion and Amortization Loss (gain) on sale of property Gain (Loss) on Sale of Property Deferred taxes Deferred Income Tax Expense (Benefit) Stock compensation expense Share-based Compensation Change in fair value of interest-rate swaps Unrealized Gain (Loss) on Derivatives Goodwill impairment loss Goodwill, Impairment Loss Joint venture investment loss Equity Method Investment, Realized Gain (Loss) on Disposal Changes in operating assets and liabilities (net of acquisitions) Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, net Increase (Decrease) in Accounts Receivable Inventories, net Increase (Decrease) in Inventories Costs/estimated earnings in excess of billings on uncompleted contracts Increase (Decrease) in Unbilled Receivables All other assets Increase (Decrease) in Other Current Assets Billings in excess of costs/estimated earnings on uncompleted contracts Increase (Decrease) in Billing in Excess of Cost of Earnings All other liabilities Increase (Decrease) in Other Current Liabilities Net cash provided by (used for) operating activities Net Cash Provided by (Used in) Operating Activities Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Capital disposals Proceeds from Sale of Property, Plant, and Equipment Acquisition of businesses (payments)/recoveries Payments to Acquire Businesses Net of Cash Acquired Excluding Previous Acquisition Payments to Acquire Businesses Net of Cash Acquired Excluding Previous Acquisition. Prior merger-related (payments)/recoveries Payments for (Proceeds from) Previous Acquisition Net cash provided by (used for) investing activities Net Cash Provided by (Used in) Investing Activities Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds (repayments) from long-term debt Proceeds from (Repayments of) Long-term Lines of Credit The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets). Proceeds (repayments) from short-term debt Proceeds from (Repayments of) Lines of Credit Deferred financing costs Payments of Financing Costs Purchase of treasury stock Payments for Repurchase of Common Stock Proceeds from the exercise of stock options Proceeds from Stock Options Exercised Payment of dividends Payments of Dividends Increase (decrease) in cash overdrafts Increase (Decrease) in Book Overdrafts Net cash provided by (used for) financing activities Net Cash Provided by (Used in) Financing Activities Foreign currency exchange impact on cash Effect of Exchange Rate on Cash and Cash Equivalents Increase/(decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Supplemental cash flow Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Cash paid for income taxes Income Taxes Paid Non-cash financing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Dividends payable Dividends Payable Capital leases Capital Lease Obligations Incurred Inventory Disclosure [Abstract] Raw materials Inventory, Raw Materials, Gross Finished goods Inventory, Finished Goods, Gross Inventory, gross Inventory, Gross Excess and obsolete inventory reserves Inventory Valuation Reserves Inventory, net Inventory, Net Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Reconciliation of Assets from Segment to Consolidated Reconciliation of Assets from Segment to Consolidated [Table Text Block] Schedule of Revenues and Gross Profit by Service Type Schedule of Revenues and Gross Profit by Service Type [Table Text Block] Schedule of Revenues and Gross Profit by Service Type [Table Text Block] Goodwill [Abstract] Goodwill Abstract Schedule of Goodwill Schedule of Goodwill [Table Text Block] Schedule of Stock-based Compensation [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Restricted stock units [Member] Restricted Stock Units (RSUs) [Member] Stock-based Compensation Arrangements [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock-based Compensation, Nonvested, Shares (in 000's) [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding, beginning Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding, ending Stock-based Compensation, Nonvested, Weighted Average Grant Date Fair Value (Per Share) [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Outstanding, beginning Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding, ending Total fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value Total unrecognized pre-tax stock-based compensation expense related to non-vested shares Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options Weighted-average period of recognition Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Data Infrastructure [Member] Data Infrastructure [Member] Data Infrastructure [Member] Voice Communications [Member] Voice Communications [Member] Voice Communications [Member] Technology Products [Member] Technology Products [Member] Technology Products [Member] Business Segments [Axis] Business Segments [Axis] Segment [Domain] Segment [Domain] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenues - On-site Sales Revenue, Services, Net Revenues - Products Sales Revenue, Goods, Net Gross profit Gross Profit Document and Entity Information [Abstract] Document and Entity Information [Abstract] 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 Current Reporting Status Entity Current Reporting Status Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Public Float Entity Public Float Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash and cash equivalents Accounts receivable, net of allowance for doubtful accounts of $6,302 and $6,273 Accounts Receivable, Net, Current Inventories, net Costs/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 Other assets Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Goodwill, net Goodwill Intangibles, net Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Total assets Assets Liabilities Liabilities [Abstract] Accounts payable Accounts Payable, Current Accrued compensation and benefits Employee-related Liabilities, Current Deferred revenue Deferred Revenue, Current Billings in excess of costs/estimated earnings on uncompleted contracts Billings in Excess of Cost Income taxes Accrued Income Taxes, Current Other liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Stockholders' Equity Stockholders' Equity Attributable to Parent [Abstract] Preferred stock authorized 5,000, par value $1.00, none issued Preferred Stock, Value, Issued Common stock authorized 100,000, par value $.001, 16,300 and 17,480 shares outstanding, 25,898 and 25,730 issued 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), Net of Tax Treasury stock, at cost 9,598 and 8,250 shares Treasury Stock, Value Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Derivative Instruments and Hedging Activities Disclosure [Abstract] Schedule of Derivative Instruments and Impact on Statements of Operations Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Number of common stock shares authorized to issue Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Common stock, par value Common Stock, Par or Stated Value Per Share Stock-based compensation expense Allocated Share-based Compensation Expense Tax benefit from stock-based compensation expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments Schedule of Long-term Debt Instruments [Table Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving credit agreement [Member] Revolving Credit Facility [Member] Swing-line loans [Member] Swing-line Loan [Member] A loan that grants an entity access to large amounts of cash in order to cover possible shortfalls from other debt commitments. Letters of credit [Member] Letter of Credit [Member] Debt Instrument, Base Interest Rate Method [Axis] Debt Instrument, Base Interest Rate Method [Axis] Debt Instrument, Base Interest Rate Method [Axis] Debt Instrument, Base Interest Rate Method [Domain] Debt Instrument, Base Interest Rate Method [Domain] Debt Instrument, Base Interest Rate Method [Domain] Weighted-average overnight federal fund rates [Member] Weighted-average Overnight Federal Fund Rates [Member] Weighted-average Overnight Federal Fund Rates [Member] LIBOR [Member] London Interbank Offered Rate [Member] London Interbank Offered Rate [Member] Basis Spread, Type [Axis] Basis Spread, Type [Axis] Basis Spread, Type [Axis] Basis Spread, Type [Domain] Basis Spread, Type [Domain] Basis Spread, Type Fixed component [Member] Fixed Component [Member] Fixed component of basis spread Variable component [Member] Variable Component [Member] Variable component of basis spread Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Revolving Credit Agreement [Line Items] Line of Credit Facility [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Additional borrowing capacity with the approval of the lenders Line of Credit Facility, Additional Borrowing Capacity Line of Credit Facility, Additional Borrowing Capacity Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Maximum amount outstanding Line of Credit Facility, Maximum Amount Outstanding During Period Weighted-average amount outstanding Line of Credit Facility, Average Outstanding Amount Weighted-average interest rate Line of Credit Facility, Interest Rate During Period Amount outstanding Line of Credit Facility, Amount Outstanding Unused commitments Line of Credit Facility, Remaining Borrowing Capacity Organization, Consolidation and Presentation of Financial Statements [Abstract] Business and Basis of Presentation Business Description and Basis of Presentation [Text Block] Reconciliation of Assets from Segment to Consolidated [Table] Reconciliation of Assets from Segment to Consolidated [Table] Operating segments [Member] Operating Segments [Member] Corporate eliminations [Member] Intersegment Elimination [Member] Segment Reporting, Asset Reconciling Item [Line Items] Segment Reporting, Asset Reconciling Item [Line Items] Assets Weighted-average common shares outstanding (basic) Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities from equity awards (shares) Incremental Common Shares Attributable to Share-based Payment Arrangements Weighted-average common shares outstanding (diluted) Weighted Average Number of Shares Outstanding, Diluted Basic earnings (loss) per common share Earnings Per Share, Basic Diluted earnings (loss) per common share Earnings Per Share, Diluted Non-dilutive equity awards excluded from computation of weighted-average common shares outstanding (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount North America [Member] North America [Member] North America [Member] Europe [Member] Europe [Member] Europe [Member] All Other [Member] All Other Segments [Member] Revenues Revenue, Net Operating income (loss) Operating Income (Loss) Depreciation Depreciation Intangibles amortization Amortization of Intangible Assets Joint venture investment loss Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Contract Type [Domain] Derivative Contract Type [Domain] Foreign currency contracts [Member] Foreign Exchange Contract [Member] Interest rate swaps [Member] Interest Rate Swap [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Derivative asset, fair value Derivative Asset, Fair Value, Gross Asset Derivative liability, fair value Derivative Liability, Fair Value, Gross Liability Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Performance share awards [Member] Performance Shares [Member] Performance goals measuring period Performance Goals Measuring Period Performance Goals Measuring Period Stock-based Compensation, Fair Value Assumptions [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] 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 Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Vested Forfeited Segment Reporting Segment Reporting Disclosure [Text Block] Stockholders' Equity Note [Abstract] Schedule of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Dividends Schedule of Dividends Payable [Table Text Block] Schedule of Common Stock Repurchases Schedule of Treasury Stock by Class [Table Text Block] Common stock purchased (shares) Treasury Stock, Shares, Acquired Aggregate purchase price Treasury Stock, Value, Acquired, Cost Method Average price per share for treasury shares Treasury Stock Acquired, Average Cost Per Share Payment related to tax withholding for share-based compensation Payments Related to Tax Withholding for Share-based Compensation Shares paid for tax withholding for share-based compensation (shares) Shares Paid for Tax Withholding for Share Based Compensation Average price per share for shares repurchased from employees for tax payment for share-based compensation Treasury Stock Acquired, Shares Repurchased for Tax Withholding for Share Based Compensation, Average Cost Per Share Total tax payments made by the entity divided by the total number of shares withheld to satisty employee income taxes. Stock repurchase programs, remaining number of shares authorized to be repurchased Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased Stock repurchase program, additional number of shares authorized to be repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Business Combinations [Abstract] Acquisitions Business Combination Disclosure [Text Block] Goodwill Goodwill Disclosure [Text Block] Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustment Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Derivative instruments, net of tax Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Defined benefit pension, net of tax Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax Accumulated other comprehensive income Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2013 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2014 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Definite-llved intangible assets, net carrying amount Finite-Lived Intangible Assets, Net Schedule of Intangible Assets (Excluding Goodwill) by Major Class [Table] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Table] Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class [Table] Intangible Assets by Major Class [Axis] Intangible Assets by Major Class [Axis] Information by major type or class of assets, excluding financial assets and goodwill, lacking physical substance. Intangible Assets, by Major Class Name [Domain] Intangible Assets, by Major Class Name [Domain] The major class of intangible asset, excluding goodwill. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of the company. Non-compete agreements [Member] Noncompete Agreements [Member] Customer relationships [Member] Customer Relationships [Member] Acquired backlog [Member] Order or Production Backlog [Member] Trademarks [Member] Trademarks [Member] Intangible Assets (Excluding Goodwill) [Line Items] Finite-lived and Indefinite-lived Intangible Assets [Line Items] Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] Definite-lived intangible assets, gross carrying amount Finite-Lived Intangible Assets, Gross Definite-lived intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Indefinite-lived intangible assets, gross carrying amount Indefinite lived intangible assets, gross Indefinite lived intangible assets, gross Indefinite-lived intangible assets, accumulated amortization Indefinite-lived Intangible Assets, Accumulated Amortization Indefinite-lived Intangible Assets, Accumulated Amortization Indefinite-lived intangible assets, net carrying amount Indefinite-Lived Intangible Assets (Excluding Goodwill) Total intangible assets, gross carrying amount Intangible Assets, Gross Intangible Assets, Gross Total intangible assets, accumulated amortization Intangible Assets Accumulated Amortization Intangible Assets Accumulated Amortization Total intangible assets, net carrying amount Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Statement of Other Comprehensive Income [Abstract] Pension Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax [Abstract] Actuarial gain (loss), taxes Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized (Gain) Loss Arising During Period, Tax Actuarial gain (loss) reclassified into results of operations, taxes Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, Tax Derivative instruments Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Effect [Abstract] Net change in fair value of cash flow hedges, taxes Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax Amounts reclassified into results of operations, taxes Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Tax Non-competes and backlogs [Member] Noncompete Agreements and Order or Production Backlog [Member] Noncompete Agreements and Order or Production Backlog [Member] Intangible Assets [Roll Forward] Intangible Assets [Roll Forward] [Roll Forward] A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Intangible assets, beginning balance Amortization expense Currency translation Intangible Assets (Excluding Goodwill), Translation Adjustments Amount of increase (decrease) to intangible assets, excluding goodwill, for foreign currency translation adjustments. Other Intangible Assets (Excluding Goodwill), Other Adjustments Intangible Assets (Excluding Goodwill), Other Adjustments Intangible assets, ending balance Indebtedness Debt Disclosure [Text Block] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill (gross), beginning Goodwill, Gross Accumulated impairment losses, beginning Goodwill, Impaired, Accumulated Impairment Loss Goodwill (net), beginning Currency translation Goodwill, Translation Adjustments Current period acquisitions (see Note 9) Goodwill, Acquired During Period Prior period acquisitions (see Note 9) Goodwill, Allocation Adjustment Goodwill (gross), ending Accumulated impairment losses, ending Goodwill (net), ending Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Other [Member] Other Long-term Debt [Member] Other Long-term Debt [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Long-term Debt Less: current portion (included in Other liabilities) Long-term Debt, Current Maturities Stockholder's Equity Stockholders' Equity Note Disclosure [Text Block] Number of technical experts Number of Technical Experts Number of Technical Experts Number of offices Number of Offices Number of Offices Number of clients Number of Clients Number of clients Number of countries in which entity operates Number of Countries in which Entity Operates Number of continents in which entity operates Number of Continents in which Entity Operates Number of Continents in which Entity Operates Number of weeks in a fiscal quarter Number of Weeks in a Fiscal Quarter Represents the number of weeks in a fiscal quarter for the entity. Inventories Inventory Disclosure [Text Block] Schedule of Short-term Debt [Table] Schedule of Short-term Debt [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other liabilities (current) [Member] Other Current Liabilities [Member] Other Current Liabilities [Member] Short-term Debt [Line Items] Short-term Debt [Line Items] Short-term debt Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Disclosure [Text Block] Stock options [Member] Stock Options [Member] Contractual life Share-based Compensation Arrangement by Share-based Payment Award, Award Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Award Contractual Life Expected life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Annual forfeiture rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Annual Forfeiture Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Annual Forfeiture Rate Volatility Stock-based Compensation, Shares (in 000's) [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding, beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding, ending Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Stock-based Compensation, Weighted Average Exercise Price (Per Share) [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] Outstanding, beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited or expired Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding, ending Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Stock-based Compensation, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Outstanding, Weighted Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Exercisable, Weighted Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Exercisable, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Total instrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value Closing stock price (per share) Share Price Stock-based Compensation, Nonvested, Shares (in 000's) [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested [Roll Forward] Non-vested, beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number Granted Vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Non-vested, ending Stock-based Compensation, Nonvested, Weighted Average Grant Date Fair Value (Per Share) [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Non-vested, beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Grant Date Fair Value Non-vested, ending Total unrecognized pre-tax stock-based compensation expense related to non-vested shares Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options Allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Treasury stock, shares Treasury Stock, Shares Fair Value Disclosures Fair Value Disclosures [Text Block] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Pension Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] Actuarial gain (loss), net of taxes of ($4), $3, ($230) and $7 Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax Amounts reclassified into results of operations, net of taxes of $43, $48, $128 and $123 Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Transition Asset (Obligation), Recognized in Net Periodic Benefit Cost, Net of Tax Derivative instruments Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract] Net change in fair value of cash flow hedges, net of taxes of ($87), ($143), ($224) and ($36) Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Amounts reclassified into results of operations, net of taxes of $61, ($63), $205 and $69 Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Income Statement [Abstract] Revenues Revenues [Abstract] Products On-Site services Total Cost of sales Cost of Goods and Services Sold [Abstract] Products Cost of Goods Sold On-Site services Cost of Services Total Cost of Goods and Services Sold Gross profit Selling, general & administrative expenses Selling, General and Administrative Expense Operating income (loss) Interest expense (income), net Interest Income (Expense), Net Other expenses (income), net Other Nonoperating Income (Expense) Income (loss) before provision (benefit) for income taxes Provision (benefit) for income taxes Net income (loss) Earnings (loss) per common share Basic Diluted Weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Diluted Dividends per share Common Stock, Dividends, Per Share, Declared Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Derivatives designated as hedging instruments [Member] Designated as Hedging Instrument [Member] Derivatives not designated as hedging instruments [Member] Not Designated as Hedging Instrument [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other comprehensive income [Member] Other Comprehensive Income (Loss) [Member] Selling, general and administrative expenses [Member] Selling, General and Administrative Expenses [Member] Interest expense (income), net [Member] Interest Expense (Income), Net [Member] Interest Expense (Income), Net [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Gain (loss) recognized in other comprehensive income (effective portion), net of taxes Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (Gain) loss reclassified from AOCI into results of operations (effective portion), net of taxes Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Gain (loss) recognized in results of operations Derivative Instruments, Gain (Loss) Recognized in Income, Net Schedule of Definite-lived and Indefinite-lived Intangible Assets Schedule of Finite-lived and Indefinite-lived Intangible Assets [Table Text Block] Schedule of finite-lived and indefinite-lived intangible assets Schedule of Changes in Net Carrying Amounts of Intangible Assets Schedule of Changes in Net Carrying Amounts of Intangible Assets [Table Text Block] Schedule of Changes in Net Carrying Amounts of Intangible Assets [Table Text Block] Schedule of Expected Amortization Expense Schedule of Expected Amortization Expense [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Other assets (current) [Member] Other Current Assets [Member] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Liability derivatives Asset derivatives Schedule of Stock Options, Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Stock Options, Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Stock Options, Nonvested Share Activity Schedule of Nonvested Share Activity [Table Text Block] Schedule of Restricted Stock Units, Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Performance Share Units, Valuation Assumptions Schedule of Share-based Payment Award, Performance-based Units, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Performance-based Units, Valuation Assumptions [Table Text Block] Schedule of Performance Share Units, Activity Schedule of Nonvested Performance-based Units Activity [Table Text Block] Accounting Policies [Abstract] Significant Accounting Policies Significant Accounting Policies [Text Block] Dividends, aggregate value Dividends, rate (per share) Dividends Payable, Amount Per Share Maximum regular quarterly dividends per year permitted under credit agreement Debt Instrument, Covenant, Maximum Quarterly Dividends per Year Maximum regular quarterly dividends per year allowed under debt agreement. Derivative [Table] Derivative [Table] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] July 2009 Interest-rate Swap [Member] July 2009 Interest-rate Swap [Member] July 2009 Interest-rate Swap [Member] July 2011 Interest-rate Swap [Member] July 2011 Interest-rate Swap [Member] July 2011 Interest-rate Swap [Member] July 2012 Interest-rate Swap [Member] July 2012 Interest-rate Swap [Member] July 2012 Interest-rate Swap [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Cash flow hedging [Member] Cash Flow Hedging [Member] Derivative [Line Items] Derivative [Line Items] Notional amount Derivative, Notional Amount Remaining maturity Derivative, Remaining Maturity Fixed interest rate Derivative, Fixed Interest Rate