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

X

- 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

X

- 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

X

- Details

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