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Commitments and Contingencies - Silverado Wildfire Matter (Details) - Silverado Wildfire	1 Months Ended
	Oct. 31, 2020 a
Loss Contingencies [Line Items]
Damaged land (in acres)	13,000
Time of pole replacement before fire	19 months

X

- Definition

Damaged Land, Area

+ References

No definition available.

+ Details

Name:	pwr_DamagedLandArea
Namespace Prefix:	pwr_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Pole Replacement, Period Before Fire

+ References

No definition available.

+ Details

Name:	pwr_PoleReplacementPeriodBeforeFire
Namespace Prefix:	pwr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=pwr_SilveradoWildfireMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: