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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities of Continuing Operations:      
Net income $ 315,082us-gaap_ProfitLoss $ 421,309us-gaap_ProfitLoss $ 322,656us-gaap_ProfitLoss
(Income) loss from discontinued operations 627us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax   (16,935)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations -      
Depreciation 158,110us-gaap_Depreciation 134,110us-gaap_Depreciation 120,303us-gaap_Depreciation
Amortization of intangible assets 35,907us-gaap_AmortizationOfIntangibleAssets 27,515us-gaap_AmortizationOfIntangibleAssets 37,691us-gaap_AmortizationOfIntangibleAssets
Equity in (earnings) losses of unconsolidated affiliates, including gain on sale of investment 332us-gaap_IncomeLossFromEquityMethodInvestments (112,744)us-gaap_IncomeLossFromEquityMethodInvestments (2,084)us-gaap_IncomeLossFromEquityMethodInvestments
Amortization of debt issuance costs 1,094us-gaap_AmortizationOfFinancingCosts 1,081us-gaap_AmortizationOfFinancingCosts 904us-gaap_AmortizationOfFinancingCosts
Amortization of deferred revenues (10,087)us-gaap_RecognitionOfDeferredRevenue (9,025)us-gaap_RecognitionOfDeferredRevenue (10,149)us-gaap_RecognitionOfDeferredRevenue
Gain on sale of property and equipment (1,770)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (2,448)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (970)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Foreign currency loss 1,244us-gaap_ForeignCurrencyTransactionGainLossUnrealized 2,179us-gaap_ForeignCurrencyTransactionGainLossUnrealized 691us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Provision for doubtful accounts 1,411us-gaap_ProvisionForDoubtfulAccounts 3,236us-gaap_ProvisionForDoubtfulAccounts 3,693us-gaap_ProvisionForDoubtfulAccounts
Provision for contract receivable 102,460pwr_ProvisionForLongtermContractReceivable    
Non-cash portion of arbitration expense 10,518pwr_NonCashArbitrationExpense    
Deferred income tax provision (benefit) 33,664us-gaap_DeferredIncomeTaxExpenseBenefit (16,470)us-gaap_DeferredIncomeTaxExpenseBenefit 22,533us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash stock-based compensation 39,030us-gaap_ShareBasedCompensation 35,876us-gaap_ShareBasedCompensation 25,990us-gaap_ShareBasedCompensation
Tax impact of stock-based equity awards (1,563)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (3,723)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (297)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in operating assets and liabilities, net of non-cash transactions -      
Accounts and notes receivable (231,974)us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable (74,249)us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable (341,825)us-gaap_IncreaseDecreaseInAccountsAndNotesReceivable
Costs and estimated earnings in excess of billings on uncompleted contracts (53,428)us-gaap_IncreaseDecreaseInUnbilledReceivables (47,281)us-gaap_IncreaseDecreaseInUnbilledReceivables (150,486)us-gaap_IncreaseDecreaseInUnbilledReceivables
Inventories (4,025)us-gaap_IncreaseDecreaseInInventories 5,986us-gaap_IncreaseDecreaseInInventories 26,435us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (36,484)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (7,505)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (12,599)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and accrued expenses and other non-current liabilities (49,894)us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities 36,015us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities 123,143us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Billings in excess of costs and estimated earnings on uncompleted contracts 5,699us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings 48,849us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings 26,624us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Other, net (5,129)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 3,881us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (8,479)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities of continuing operations 310,824us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 446,592us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 166,839us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities of Continuing Operations:      
Proceeds from sale of property and equipment 14,428us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 14,794us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 12,362us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Additions of property and equipment (301,476)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (263,558)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (209,445)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cash paid for acquisitions, net of cash acquired (262,218)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (283,837)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (68,727)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Investments in and return of equity from unconsolidated affiliates (3,127)us-gaap_PaymentsForProceedsFromOtherInvestingActivities 186,185us-gaap_PaymentsForProceedsFromOtherInvestingActivities (53,750)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Cash received from (paid for) other investments 6,214us-gaap_PaymentsForProceedsFromInvestments (10,032)us-gaap_PaymentsForProceedsFromInvestments  
Cash withdrawn from restricted cash 3,565us-gaap_DecreaseInRestrictedCash 36,482us-gaap_DecreaseInRestrictedCash  
Cash paid for other intangibles (252)pwr_CashPaidForOtherIntangibles   (1,541)pwr_CashPaidForOtherIntangibles
Net cash used in investing activities of continuing operations (542,866)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (319,966)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (321,101)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities of Continuing Operations:      
Borrowings under credit facility 938,047us-gaap_ProceedsFromLongTermLinesOfCredit 341,730us-gaap_ProceedsFromLongTermLinesOfCredit 1,052,700us-gaap_ProceedsFromLongTermLinesOfCredit
Payments under credit facility (866,224)us-gaap_RepaymentsOfLongTermLinesOfCredit (341,730)us-gaap_RepaymentsOfLongTermLinesOfCredit (1,052,700)us-gaap_RepaymentsOfLongTermLinesOfCredit
Borrowings of other long-term debt 394us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt 23us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt  
Payments on other long-term debt (30,448)us-gaap_RepaymentsOfOtherLongTermDebt (556)us-gaap_RepaymentsOfOtherLongTermDebt (56)us-gaap_RepaymentsOfOtherLongTermDebt
Borrowings of short-term debt 5,056us-gaap_ProceedsFromShortTermDebt    
Debt issuance and amendment costs   (3,244)us-gaap_PaymentsOfDebtIssuanceCosts  
Distributions to non-controlling interests (14,432)us-gaap_PaymentsOfDividendsMinorityInterest (17,625)us-gaap_PaymentsOfDividendsMinorityInterest (17,970)us-gaap_PaymentsOfDividendsMinorityInterest
Tax impact of stock-based equity awards 1,563us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 3,723us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 297us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Exercise of stock options 1,179us-gaap_ProceedsFromStockOptionsExercised 1,028us-gaap_ProceedsFromStockOptionsExercised 2,385us-gaap_ProceedsFromStockOptionsExercised
Repurchase of common stock (93,482)us-gaap_PaymentsForRepurchaseOfCommonStock    
Net cash used in financing activities of continuing operations (58,347)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (16,651)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (15,344)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Discontinued operations:      
Net cash used in operating activities     (60,622)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Net cash provided by investing activities     307,522us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash provided by discontinued operations     246,900us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
Effect of foreign exchange rate changes on cash and cash equivalents (7,873)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (15,899)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 2,058us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents (298,262)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 94,076us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 79,352us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 488,777us-gaap_CashAndCashEquivalentsAtCarryingValue 394,701us-gaap_CashAndCashEquivalentsAtCarryingValue 315,349us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 190,515us-gaap_CashAndCashEquivalentsAtCarryingValue 488,777us-gaap_CashAndCashEquivalentsAtCarryingValue 394,701us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:      
Interest paid (3,533)us-gaap_InterestPaid (1,586)us-gaap_InterestPaid (2,734)us-gaap_InterestPaid
Income taxes paid (229,187)us-gaap_IncomeTaxesPaid (253,175)us-gaap_IncomeTaxesPaid (155,494)us-gaap_IncomeTaxesPaid
Income tax refunds $ 7,376us-gaap_ProceedsFromIncomeTaxRefunds $ 1,826us-gaap_ProceedsFromIncomeTaxRefunds $ 4,106us-gaap_ProceedsFromIncomeTaxRefunds