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Commitments and Contingencies (Performance Bonds and Parent Guarantees) - Additional Information (Detail) $ in Billions | Sep. 30, 2016 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
Total amount of outstanding performance bonds | $ 3.5
Estimated cost to complete bonded projects | $ 1.3

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- Definition Estimated cost to complete bonded projects. + References No definition available. + Details
Name: | pwr_EstimatedCostToCompleteBondedProjects
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Outstanding performance bonds amount. + References No definition available. + Details
Name: | pwr_OutstandingPerformanceBondsAmount
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration