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Equity-Based Compensation - Stock Incentive Plans (Detail)	Sep. 30, 2017 shares
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares of common stock that may be issued (in shares)	11,750,000

X

- Definition

Common stock available for awards pursuant to the plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	pwr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_PlanNameAxis=pwr_TwoThousandAndElevenPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: