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Commitments and Contingencies - Committed Expenditures (Details) $ in Millions	Sep. 30, 2021 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated committed in first half of 2022	$ 68.4
Vehicle Fleet Committed Capital
Unrecorded Unconditional Purchase Obligation [Line Items]
Estimated committed, remainder of fiscal year	58.5
Estimated committed in 2022	$ 106.9

X

- Definition

Unrecorded Unconditional Purchase Obligation, to be Paid, Year One, Payments In First Half Of Year

+ References

No definition available.

+ Details

Name:	pwr_UnrecordedUnconditionalPurchaseObligationToBePaidYearOnePaymentsInFirstHalfOfYear
Namespace Prefix:	pwr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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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

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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: