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Segment Information - Summarized Financial Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 2,052,982 us-gaap_SalesRevenueServicesNet | $ 2,171,144 us-gaap_SalesRevenueServicesNet | $ 1,864,550 us-gaap_SalesRevenueServicesNet | $ 1,762,574 us-gaap_SalesRevenueServicesNet | $ 1,817,623 us-gaap_SalesRevenueServicesNet | $ 1,645,132 us-gaap_SalesRevenueServicesNet | $ 1,474,377 us-gaap_SalesRevenueServicesNet | $ 1,585,710 us-gaap_SalesRevenueServicesNet | $ 7,851,250 us-gaap_SalesRevenueServicesNet | $ 6,522,842 us-gaap_SalesRevenueServicesNet | $ 5,920,269 us-gaap_SalesRevenueServicesNet
Operating income (loss) |  |  |  |  |  |  |  |  | 475,575 us-gaap_OperatingIncomeLoss | 526,928 us-gaap_OperatingIncomeLoss | 465,122 us-gaap_OperatingIncomeLoss
Depreciation |  |  |  |  |  |  |  |  | 158,110 us-gaap_Depreciation | 134,110 us-gaap_Depreciation | 120,303 us-gaap_Depreciation
Electric Power Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 5,238,627 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember | 4,480,647 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember | 4,206,509 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember
Operating income (loss) |  |  |  |  |  |  |  |  | 458,332 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember | 521,855 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember | 520,834 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember
Depreciation |  |  |  |  |  |  |  |  | 74,723 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember | 63,407 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember | 55,205 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_ElectricPowerInfrastructureMember
Oil and Gas Infrastructure Services [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,444,558 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember | 1,869,615 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember | 1,534,713 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember
Operating income (loss) |  |  |  |  |  |  |  |  | 162,797 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember | 138,543 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember | 55,410 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember
Depreciation |  |  |  |  |  |  |  |  | 57,414 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember | 47,050 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember | 43,285 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_OilAndGasInfrastructureServicesMember
Fiber Optic Licensing and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 168,065 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember | 172,580 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember | 179,047 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember
Operating income (loss) |  |  |  |  |  |  |  |  | 54,386 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember | 55,415 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember | 61,299 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember
Depreciation |  |  |  |  |  |  |  |  | 18,495 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember | 16,786 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember | 15,173 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_FiberOpticLicensingAndOtherMember
Corporate and Non-Allocated Costs [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (199,940)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_CorporateAndNonAllocatedCostsMember | (188,885)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_CorporateAndNonAllocatedCostsMember | (172,421)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pwr_CorporateAndNonAllocatedCostsMember
Depreciation |  |  |  |  |  |  |  |  | $ 7,478 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_CorporateAndNonAllocatedCostsMember | $ 6,867 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_CorporateAndNonAllocatedCostsMember | $ 6,640 us-gaap_Depreciation / us-gaap_StatementBusinessSegmentsAxis = pwr_CorporateAndNonAllocatedCostsMember

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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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