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Summary of Significant Accounting Policies - Earnings Per Share (Details) | 9 Months Ended
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Sep. 30, 2019 shares
Accounting Policies [Abstract] |
Number of shares of common stock received for each exchangeable share (in shares) | 1

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- Definition Number of shares of common stock received for each exchangeable share. + References No definition available. + Details
Name: | pwr_NumberOfSharesOfCommonStockReceivedForEachExchangeableShare
Namespace Prefix: | pwr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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