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Commitment and Contingencies - Outstanding Capital Commitments Associated with Investments in Unconsolidated Affiliates (Parenthetical) (Detail) (Corporate Joint Venture [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Corporate Joint Venture [Member] |
Other Commitments [Line Items] |
Return of capital from unconsolidated affiliates anticipated for 2017 | $ 48.7 pwr_ForecastedReturnsOfCapitalFromUnconsolidatedAffiliatesInTwoYears / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember

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- Definition Forecasted returns of capital from unconsolidated affiliates in two years. + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration