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Summary of Significant Accounting Policies - Insurance (Details) | Sep. 30, 2020 USD ($)
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Accounting Policies [Abstract] |
Employer's liability claims subject to deductible per occurrence | $ 5,000,000.0
Worker's compensation claims per occurrence | 5,000,000.0
Auto liability insurance claims deductible | 15,000,000.0
General liability insurance claims deductible | 15,000,000.0
Employee health care benefit plans subject to deductible per claimant | $ 800,000

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- Definition Auto liability insurance 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: | instant

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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: | instant

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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: | instant

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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: | instant

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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: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
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Period Type: | duration