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Summary of Significant Accounting Policies - Earnings Per Share (Details)	12 Months Ended
	Dec. 31, 2020 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