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Employee Benefit Plans - Summary of Plan Information Relating to Participation in Multi-Employer Pension Plans (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 71,204 us-gaap_MultiemployerPlanPeriodContributions | $ 55,054 us-gaap_MultiemployerPlanPeriodContributions | $ 63,572 us-gaap_MultiemployerPlanPeriodContributions
National Electrical Benefit Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 53-0181657-001 |  |
PPA Zone Status | Green | Green |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | 20,758 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_NationalElectricalBenefitFundMember | 17,268 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_NationalElectricalBenefitFundMember | 18,509 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_NationalElectricalBenefitFundMember
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through August 2018 |  |
Central Pension Fund of the IUOE & Participating Employers [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 36-6052390-001 |  |
PPA Zone Status | Green | Green |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | 7,847 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_CentralPensionFundOfIuoeAndParticipatingEmployersMember | 4,259 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_CentralPensionFundOfIuoeAndParticipatingEmployersMember | 6,843 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_CentralPensionFundOfIuoeAndParticipatingEmployersMember
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through June 2017 |  |
Pipeline Industry Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 73-6146433-001 |  |
PPA Zone Status | Green | Green |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | 6,280 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_PipelineIndustryPensionFundMember | 4,511 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_PipelineIndustryPensionFundMember | 7,434 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_PipelineIndustryPensionFundMember
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through June 2017 |  |
Pipeline Industry Pension Fund [Member] | Maximum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2013 |  |
Pipeline Industry Pension Fund [Member] | Minimum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2012 |  |
Laborers National Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 75-1280827-001 |  |
PPA Zone Status | Green | Green |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | 4,227 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_LaborersNationalPensionFundMember | 4,681 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_LaborersNationalPensionFundMember | 1,906 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_LaborersNationalPensionFundMember
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | April 2015 |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2013 |  |
Eighth District Electrical Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 84-6100393-001 |  |
PPA Zone Status | Green | Green |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | 2,192 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_EighthDistrictElectricalPensionFundMember | 1,790 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_EighthDistrictElectricalPensionFundMember | 4,415 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_EighthDistrictElectricalPensionFundMember
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through February 2018 |  |
Eighth District Electrical Pension Fund [Member] | Maximum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2013 |  |
Eighth District Electrical Pension Fund [Member] | Minimum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2012 |  |
Joint Pension Local Union 164 IBEW [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 22-6031199-001 |  |
PPA Zone Status | Yellow | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | 1,816 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_JointPensionLocalUnionOneSixFourIbewMember | 222 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_JointPensionLocalUnionOneSixFourIbewMember | 515 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_JointPensionLocalUnionOneSixFourIbewMember
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | May 2017 |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2013 |  |
Laborers Pension Trust Fund for Northern California [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 94-6277608-001 |  |
PPA Zone Status | Yellow | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | 1,357 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_LaborersPensionTrustFundForNorthernCaliforniaMember | 987 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_LaborersPensionTrustFundForNorthernCaliforniaMember | 21 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_LaborersPensionTrustFundForNorthernCaliforniaMember
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | June 2019 |  |
Michigan Upper Peninsula Intrl Brotherhood of Elec Workers Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 36-3020872-001 |  |
PPA Zone Status | Yellow | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | 1,307 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_MichiganUpperPeninsulaIntrlBrotherhoodOfElecWorkersPensionPlanMember | 299 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_MichiganUpperPeninsulaIntrlBrotherhoodOfElecWorkersPensionPlanMember | 518 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_MichiganUpperPeninsulaIntrlBrotherhoodOfElecWorkersPensionPlanMember
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | May 2017 |  |
Michigan Upper Peninsula Intrl Brotherhood of Elec Workers Pension Plan [Member] | Maximum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2013 |  |
Michigan Upper Peninsula Intrl Brotherhood of Elec Workers Pension Plan [Member] | Minimum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2012 |  |
Operating Engineers Local Three Two Four Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 38-1900637-001 |  |
PPA Zone Status | Red | Red |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | 1,086 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_OperatingEngineersLocalThreeTwoFourPensionFundMember | 818 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_OperatingEngineersLocalThreeTwoFourPensionFundMember | 135 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_OperatingEngineersLocalThreeTwoFourPensionFundMember
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | Varies through April 2018 |  |
OE Pension Trust Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 94-6090764-001 |  |
PPA Zone Status | Red | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | 991 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_OePensionTrustFundMember | 902 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_OePensionTrustFundMember | 768 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_OePensionTrustFundMember
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | July 2016 |  |
Alaska Teamster Employer Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 92-6003463-024 |  |
PPA Zone Status | Red | Red |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | 516 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_AlaskaTeamsterEmployerPensionPlanMember | 241 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_AlaskaTeamsterEmployerPensionPlanMember |
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | October 2017 |  |
Central States, Southeast, and Southwest Areas Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 36-6044243-001 |  |
PPA Zone Status | Red | Red |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions |  |  | 22 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember
Surcharge Imposed | Yes |  |
All Other Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 22,827 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_AllOtherPlansMember | $ 19,076 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_AllOtherPlansMember | $ 22,486 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanTypeAxis = pwr_AllOtherPlansMember

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- Definition Significant Periods Of Multiemployer Contributions Exceeding Specified Percentage + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Description of the significant collective-bargaining arrangements within the range of expiration dates for collective-bargaining arrangements requiring contributions to a multiemployer plan as well as other information to help investors understand the significance of the collective-bargaining agreements and when they expire. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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