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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 | $ 315,082 us-gaap_ProfitLoss | $ 421,309 us-gaap_ProfitLoss | $ 322,656 us-gaap_ProfitLoss
(Income) loss from discontinued operations | 627 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (16,935)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations - |  |  |
Depreciation | 158,110 us-gaap_Depreciation | 134,110 us-gaap_Depreciation | 120,303 us-gaap_Depreciation
Amortization of intangible assets | 35,907 us-gaap_AmortizationOfIntangibleAssets | 27,515 us-gaap_AmortizationOfIntangibleAssets | 37,691 us-gaap_AmortizationOfIntangibleAssets
Equity in (earnings) losses of unconsolidated affiliates, including gain on sale of investment | 332 us-gaap_IncomeLossFromEquityMethodInvestments | (112,744)us-gaap_IncomeLossFromEquityMethodInvestments | (2,084)us-gaap_IncomeLossFromEquityMethodInvestments
Amortization of debt issuance costs | 1,094 us-gaap_AmortizationOfFinancingCosts | 1,081 us-gaap_AmortizationOfFinancingCosts | 904 us-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 | 1,244 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 2,179 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 691 us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Provision for doubtful accounts | 1,411 us-gaap_ProvisionForDoubtfulAccounts | 3,236 us-gaap_ProvisionForDoubtfulAccounts | 3,693 us-gaap_ProvisionForDoubtfulAccounts
Provision for contract receivable | 102,460 pwr_ProvisionForLongtermContractReceivable |  |
Non-cash portion of arbitration expense | 10,518 pwr_NonCashArbitrationExpense |  |
Deferred income tax provision (benefit) | 33,664 us-gaap_DeferredIncomeTaxExpenseBenefit | (16,470)us-gaap_DeferredIncomeTaxExpenseBenefit | 22,533 us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash stock-based compensation | 39,030 us-gaap_ShareBasedCompensation | 35,876 us-gaap_ShareBasedCompensation | 25,990 us-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 | 5,986 us-gaap_IncreaseDecreaseInInventories | 26,435 us-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 | 36,015 us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities | 123,143 us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Billings in excess of costs and estimated earnings on uncompleted contracts | 5,699 us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings | 48,849 us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings | 26,624 us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Other, net | (5,129)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 3,881 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | (8,479)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities of continuing operations | 310,824 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 446,592 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 166,839 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities of Continuing Operations: |  |  |
Proceeds from sale of property and equipment | 14,428 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 14,794 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 12,362 us-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 | 186,185 us-gaap_PaymentsForProceedsFromOtherInvestingActivities | (53,750)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Cash received from (paid for) other investments | 6,214 us-gaap_PaymentsForProceedsFromInvestments | (10,032)us-gaap_PaymentsForProceedsFromInvestments |
Cash withdrawn from restricted cash | 3,565 us-gaap_DecreaseInRestrictedCash | 36,482 us-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 | 938,047 us-gaap_ProceedsFromLongTermLinesOfCredit | 341,730 us-gaap_ProceedsFromLongTermLinesOfCredit | 1,052,700 us-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 | 394 us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt | 23 us-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 | 5,056 us-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 | 1,563 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 3,723 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 297 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Exercise of stock options | 1,179 us-gaap_ProceedsFromStockOptionsExercised | 1,028 us-gaap_ProceedsFromStockOptionsExercised | 2,385 us-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 |  |  | 307,522 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Net cash provided by discontinued operations |  |  | 246,900 us-gaap_NetCashProvidedByUsedInDiscontinuedOperations
Effect of foreign exchange rate changes on cash and cash equivalents | (7,873)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (15,899)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 2,058 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents | (298,262)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 94,076 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 79,352 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year | 488,777 us-gaap_CashAndCashEquivalentsAtCarryingValue | 394,701 us-gaap_CashAndCashEquivalentsAtCarryingValue | 315,349 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year | 190,515 us-gaap_CashAndCashEquivalentsAtCarryingValue | 488,777 us-gaap_CashAndCashEquivalentsAtCarryingValue | 394,701 us-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 | $ 7,376 us-gaap_ProceedsFromIncomeTaxRefunds | $ 1,826 us-gaap_ProceedsFromIncomeTaxRefunds | $ 4,106 us-gaap_ProceedsFromIncomeTaxRefunds

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- Definition The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 5 + Details
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- Definition The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A -Subsection 1 + Details
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- Definition The cash outflow for the settlement of obligation drawn 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 maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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