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Business and Organization - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
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Jun. 30, 2012 Entity | Dec. 31, 2014 Segment Entity | Dec. 31, 2013 Entity | Dec. 31, 2012 Entity
Organization And Description Of Business [Line Items] |  |  |  |
Number of reportable segments |  | 3 us-gaap_NumberOfReportableSegments |  |
Fiber Optic Licensing Terms, Minimum in years |  | 5 years | 5 years |
Fiber Optic Licensing Terms, Maximum in years |  | 25 years | 25 years |
Number of business acquisitions | 4 us-gaap_NumberOfBusinessesAcquired | 9 us-gaap_NumberOfBusinessesAcquired | 6 us-gaap_NumberOfBusinessesAcquired | 4 us-gaap_NumberOfBusinessesAcquired
Proceeds from sale of subsidiary |  |  |  | $ 265.0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
Electric Power Infrastructure Services Business [Member] | Canada [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions | 1 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA | 4 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA |  |
Electric Power Infrastructure Services Business [Member] | Australia [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions |  | 1 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_AU |  |
Electric Power Infrastructure Services Business [Member] | United States [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions | 2 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US | 1 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US |  |
Electric Power Infrastructure Services Business [Member] | Us Canada Australia [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions |  |  | 3 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = pwr_UsCanadaAustraliaMember |
Oil and Gas Infrastructure Services Business [Member] | Canada [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions |  | 2 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_CA |  |
Oil and Gas Infrastructure Services Business [Member] | United States [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions | 1 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US | 1 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = country_US |  |
Oil and Gas Infrastructure Services Business [Member] | Us Canada Australia [Member] |  |  |  |
Organization And Description Of Business [Line Items] |  |  |  |
Number of business acquisitions |  |  | 3 us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesBusinessMember / us-gaap_StatementGeographicalAxis = pwr_UsCanadaAustraliaMember |

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- Definition Maximum licensing terms. + References No definition available. + Details
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- Definition Minimum licensing terms. + References No definition available. + Details
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- Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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Balance Type: | na
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- 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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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Details
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- Details
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