Acquisitions - Additional Information (Detail) (USD $)
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3 Months Ended |
12 Months Ended |
Mar. 31, 2015
Entity
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Mar. 31, 2014
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Dec. 31, 2014
Entity
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Business Acquisition [Line Items] |
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Cash paid for acquisitions |
$ 36,900,000pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred
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$ 284,300,000pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred
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Number of business acquisitions |
3us-gaap_NumberOfBusinessesAcquired
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9us-gaap_NumberOfBusinessesAcquired
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Number of shares granted for acquired companies |
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686,382us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
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Value of equity interests transferred |
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134,500,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
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Goodwill acquired |
18,331,000us-gaap_GoodwillAcquiredDuringPeriod
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Fair value of accounts receivable acquired |
6,200,000us-gaap_BusinessCombinationAcquiredReceivablesFairValue
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117,000,000us-gaap_BusinessCombinationAcquiredReceivablesFairValue
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Goodwill expected to be deductible for income tax |
0us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
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30,100,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
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Income (loss) from continuing operations before income taxes |
92,560,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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91,701,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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Third and Fourth Quarter 2014 [Member] |
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Business Acquisition [Line Items] |
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Net tangible assets acquired |
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106,900,000pwr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetTangibleAssets / us-gaap_BusinessAcquisitionAxis = pwr_ThirdAndFourthQuarterTwoThousandFourteenAcquisitionsMember
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Goodwill acquired |
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116,100,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = pwr_ThirdAndFourthQuarterTwoThousandFourteenAcquisitionsMember
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Other intangible assets, acquired |
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73,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pwr_ThirdAndFourthQuarterTwoThousandFourteenAcquisitionsMember
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Contributed by Acquisitions [Member] |
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Business Acquisition [Line Items] |
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Revenues |
7,000,000us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember
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Income (loss) from continuing operations before income taxes |
(1,000,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember
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Acquisition costs |
500,000us-gaap_AcquisitionCosts / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember
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First Quarter Two Thousand Fifteen [Member] |
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Business Acquisition [Line Items] |
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Net tangible assets acquired |
9,500,000pwr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetTangibleAssets / us-gaap_BusinessAcquisitionAxis = pwr_FirstQuarterTwoThousandFifteenAcquisitionsMember
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Goodwill acquired |
18,300,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = pwr_FirstQuarterTwoThousandFifteenAcquisitionsMember
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Other intangible assets, acquired |
9,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pwr_FirstQuarterTwoThousandFifteenAcquisitionsMember
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Canadian Subsidiaries [Member] | Exchangeable Shares [Member] |
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Business Acquisition [Line Items] |
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Number of shares granted for acquired companies |
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3,825,971us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_StatementEquityComponentsAxis = pwr_ExchangeableSharesMember / us-gaap_StatementGeographicalAxis = pwr_CanadianSubsidiariesMember
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Series G Preferred Stock [Member] |
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Business Acquisition [Line Items] |
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Number of shares granted for acquired companies |
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1us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember
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Series G Preferred Stock [Member] | Canadian Subsidiaries [Member] | Exchangeable Shares [Member] |
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Business Acquisition [Line Items] |
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Number of shares granted for acquired companies |
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899,858us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember / us-gaap_StatementEquityComponentsAxis = pwr_ExchangeableSharesMember / us-gaap_StatementGeographicalAxis = pwr_CanadianSubsidiariesMember
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Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |
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Business Acquisition [Line Items] |
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Number of business acquisitions |
1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA
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2us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA
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Oil and Gas Infrastructure Services Business [Member] | Australia [Member] |
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Business Acquisition [Line Items] |
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Number of business acquisitions |
1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_AU
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Oil and Gas Infrastructure Services Business [Member] | United States [Member] |
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Business Acquisition [Line Items] |
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Number of business acquisitions |
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1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US
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Electric Power Infrastructure Services Business [Member] | Canada [Member] |
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Business Acquisition [Line Items] |
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Number of business acquisitions |
1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA
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4us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA
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Electric Power Infrastructure Services Business [Member] | Australia [Member] |
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Business Acquisition [Line Items] |
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Number of business acquisitions |
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1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_AU
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Electric Power Infrastructure Services Business [Member] | United States [Member] |
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Business Acquisition [Line Items] |
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Number of business acquisitions |
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1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US
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Electric Power Division [Member] |
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Business Acquisition [Line Items] |
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Goodwill acquired |
949,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerDivisionMember
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71,500,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerDivisionMember
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Oil and Gas Infrastructure Division [Member] |
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Business Acquisition [Line Items] |
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Goodwill acquired |
$ 17,382,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasMember
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$ 103,000,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasMember
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