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

X

- 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

X

- References

No definition available.

+ Details

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