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Acquisitions - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012 Entity	Dec. 31, 2014 Entity	Dec. 31, 2013 Entity	Dec. 31, 2012 Entity
Business Acquisition [Line Items]
Number of business acquisitions	4us-gaap_NumberOfBusinessesAcquired	9us-gaap_NumberOfBusinessesAcquired	6us-gaap_NumberOfBusinessesAcquired	4us-gaap_NumberOfBusinessesAcquired
Cash paid for acquisitions		$ 284,300,000pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred	$ 341,100,000pwr_AggregateBusinessAcquisitionConsiderationOfAcquiredEntityCashPaidAndLiabilitiesIncurred
Number of shares granted for acquired companies		686,382us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued	3,547,482us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued	1,927,113us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
Value of equity interests transferred		134,500,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	88,900,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	37,300,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Goodwill acquired		174,485,000us-gaap_GoodwillAcquiredDuringPeriod	255,806,000us-gaap_GoodwillAcquiredDuringPeriod
Cash paid for acquisitions				57,500,000us-gaap_PaymentsToAcquireBusinessesGross
Payment of cash to repay acquiree debt				11,000,000pwr_AggregateBusinessCombinationConsiderationTransferredLiabilitiesIncurred
Fair value of accounts receivable acquired		117,000,000us-gaap_BusinessCombinationAcquiredReceivablesFairValue	83,900,000us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Goodwill expected to be deductible for income tax		30,100,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount	213,600,000us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
Income (Loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest		473,117,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	639,249,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	464,580,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Electric Power Infrastructure Services Business [Member] | Canada [Member]
Business Acquisition [Line Items]
Number of business acquisitions		4us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA
Electric Power Infrastructure Services Business [Member] | Australia [Member]
Business Acquisition [Line Items]
Number of business acquisitions		1us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_AU
Electric Power Infrastructure Services Business [Member] | United States [Member]
Business Acquisition [Line Items]
Number of business acquisitions		1us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US
Oil and Gas Infrastructure Services Business [Member] | Canada [Member]
Business Acquisition [Line Items]
Number of business acquisitions		2us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA
Oil and Gas Infrastructure Services Business [Member] | California [Member]
Business Acquisition [Line Items]
Number of business acquisitions		1us-gaap_NumberOfBusinessesAcquired / us-gaap_BusinessAcquisitionAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = stpr_CA
Third and Fourth Quarter 2014 [Member]
Business Acquisition [Line Items]
Net tangible assets acquired		106,900,000pwr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetTangibleAssets / us-gaap_BusinessAcquisitionAxis = pwr_ThirdAndFourthQuarterTwoThousandFourteenAcquisitionsMember
Goodwill acquired		116,100,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = pwr_ThirdAndFourthQuarterTwoThousandFourteenAcquisitionsMember
Other intangible assets, acquired		73,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = pwr_ThirdAndFourthQuarterTwoThousandFourteenAcquisitionsMember
Contributed by Acquisitions [Member]
Business Acquisition [Line Items]
Revenues		314,100,000us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember	251,300,000us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember	125,700,000us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember
Income (Loss) from continuing operations before income taxes, extraordinary items, noncontrolling interest		3,400,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember	18,200,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember	6,200,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember
Acquisition costs		11,600,000us-gaap_AcquisitionCosts / us-gaap_BusinessAcquisitionAxis = pwr_ContributedByAcquisitionsMember
Exchangeable Shares [Member] | Canadian Subsidiaries [Member]
Business Acquisition [Line Items]
Number of shares granted for acquired companies		3,825,971us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_StatementEquityComponentsAxis = pwr_ExchangeableSharesMember / us-gaap_StatementGeographicalAxis = pwr_CanadianSubsidiariesMember
Electric Power Infrastructure Services Business [Member]
Business Acquisition [Line Items]
Goodwill acquired		71,517,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember	112,549,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember
Electric Power Infrastructure Services Business [Member] | Canada [Member]
Business Acquisition [Line Items]
Number of business acquisitions	1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA	4us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA
Electric Power Infrastructure Services Business [Member] | Australia [Member]
Business Acquisition [Line Items]
Number of business acquisitions		1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_AU
Electric Power Infrastructure Services Business [Member] | United States [Member]
Business Acquisition [Line Items]
Number of business acquisitions	2us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US	1us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US
Oil and Gas Infrastructure Division [Member]
Business Acquisition [Line Items]
Goodwill acquired		$ 102,968,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasMember	$ 143,257,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasMember
Series G Preferred Stock [Member]
Business Acquisition [Line Items]
Number of shares granted for acquired companies		1us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember
Series G Preferred Stock [Member] | Exchangeable Shares [Member] | Canadian Subsidiaries [Member]
Business Acquisition [Line Items]
Number of shares granted for acquired companies		899,858us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesGPreferredStockMember / us-gaap_StatementEquityComponentsAxis = pwr_ExchangeableSharesMember / us-gaap_StatementGeographicalAxis = pwr_CanadianSubsidiariesMember

X

- Definition

Aggregate business acquisition consideration of acquired entity cash paid and liabilities incurred during period.

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- Definition

Aggregate amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Amount of tangible assets acquired less liabilities assumed at the acquisition date.

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- Definition

The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-10.(c)(7)(ii))

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Number of shares of equity interests issued or issuable to acquire entity.

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- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Glossary Investing Activities

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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