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Commitments and Contingencies - Committed Expenditures (Details) $ in Millions | Jun. 30, 2020 USD ($)
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Vehicle Fleet Committed Capital |
Unrecorded Unconditional Purchase Obligation [Line Items] |
Estimated committed capital in 2020 | $ 34.1

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- Definition Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in remainder of current fiscal year. + References No definition available. + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=pwr_VehicleFleetCommittedCapitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |