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Commitments and Contingencies - Silverado Wildfire Matter (Details) - Silverado Wildfire - a | 1 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Oct. 31, 2020
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

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- 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: |