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Commitments and Contingencies - Joint Venture Liabilities (Details) $ in Millions	Dec. 31, 2022 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Outstanding capital commitments due in next twelve months	$ 0.6
Outstanding capital commitments due after next twelve months	$ 10.5

X

- Definition

Equity Method Investments, Outstanding Commitment, To Be Paid, After Year One

+ References

No definition available.

+ Details

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Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Equity Method Investments, Outstanding Commitment, To Be Paid, Year One

+ References

No definition available.

+ Details

Name:	pwr_EquityMethodInvestmentsOutstandingCommitmentToBePaidYearOne
Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration