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Summary of Significant Accounting Policies - Insurance (Detail) | 9 Months Ended
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Sep. 30, 2018 USD ($)
Accounting Policies [Abstract] |
Employer's liability claims subject to deductible per occurrence | $ 1,000,000.0
Worker's compensation claims per occurrence | 5,000,000.0
Auto liability insurance claims deductible | 10,000,000.0
General liability insurance claims deductible | 10,000,000
Employee health care benefit plans subject to deductible per claimant | $ 500,000

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- Definition Auto liability insurance claims deductible amount per occurrence. + References No definition available. + Details
Name: | pwr_AutoLiabilityInsuranceClaimsDeductible
Namespace Prefix: | pwr_
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
Name: | pwr_EmployersLiabilityInsuranceClaimsDeductible
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
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration