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Supplemental Cash Flow Information - Narrative (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017 USD ($)
Supplemental Cash Flow Elements [Abstract]
Notes receivable reduction	$ 7.1

X

- Definition

Notes Receivable Reduction

+ References

No definition available.

+ Details

Name:	pwr_NotesReceivableReduction
Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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