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Equity-Based Compensation - Stock Incentive Plans (Detail) | Sep. 30, 2017 shares
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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

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- 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

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- 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

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