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Supplemental Cash Flow Information - Narrative (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($)
Supplemental Cash Flow Elements [Abstract] |
Marine industrial property acquired | $ 6.4

X
- Definition Noncash Or Part Noncash Acquisition, Land Acquired + References No definition available. + Details
Name: | pwr_NoncashOrPartNoncashAcquisitionLandAcquired
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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