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Business and Organization - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 Entity Segment | Mar. 31, 2013 | Dec. 31, 2013 Entity
Organization And Description Of Business [Line Items] |  |  |
Number of reportable segments | 3 |  |
Fiber Optic Licensing Terms, Minimum in years | 5 years | 5 years | 5 years
Fiber Optic Licensing Terms, Maximum in years | 25 years | 25 years | 25 years
Number of business acquisitions | 5 |  | 6
Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |  |
Organization And Description Of Business [Line Items] |  |  |
Number of business acquisitions | 4 |  |
Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |  |
Organization And Description Of Business [Line Items] |  |  |
Number of business acquisitions | 1 |  |

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- Definition Maximum Licensing Terms + References No definition available. + Details
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Namespace Prefix: | pwr_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Minimum Licensing Terms + References No definition available. + Details
Name: | pwr_MinimumLicensingTerms
Namespace Prefix: | pwr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Period Type: | duration

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration