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Summary of Significant Accounting Policies (Self-Insurance) - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
General liability insurance claims deductible | $ 10,000,000
Auto liability insurance claims deductible | 10,000,000
Worker's compensation claims per occurrence | 5,000,000
Employer's liability claims subject to deductible per occurrence | 1,000,000
Employee health care benefit plans subject to deductible per claimant | $ 400,000

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- Definition Auto liability insurance claims deductible amount per occurrence. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Employer's liability claims deductible amount per occurrence. + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition General liability insurance claims deductible amount per occurrence. + References No definition available. + Details
Name: | pwr_GeneralLiabilityInsuranceClaimsDeductible
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Health care deductible. + References No definition available. + Details
Name: | pwr_HealthCareDeductible
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Workers' compensation insurance claims deductible. + References No definition available. + Details
Name: | pwr_WorkersCompensationInsuranceClaimsDeductible
Namespace Prefix: | pwr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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