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Employee Benefit Plans - Summary of Plan Information Relating to Participation in Multiemployer Pension Plans (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 85,235 | $ 77,015 | $ 71,204
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 | $ 22,912 | $ 21,200 | 20,758
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through March 2020 |  |
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 | $ 6,954 | $ 6,087 | 6,280
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | 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 | 2015 |  |
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 | 2014 |  |
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 | $ 5,668 | $ 5,677 | 7,847
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through June 2017 |  |
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 | $ 3,805 | $ 2,603 | 1,357
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | June 2019 |  |
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 | $ 3,089 | $ 2,544 | 2,192
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through November 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 | 2015 |  |
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 | 2014 |  |
Alaska Electrical Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 92-6005171-001 |  |
PPA Zone Status | Green | Green |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | $ 2,701 | $ 639 | 68
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through March 2017 |  |
IBEW Local 456 Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 22-6238995-001 |  |
PPA Zone Status | Green | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | $ 2,298 | $ 886 | 810
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through December 2017 |  |
Plumbers and Pipefitters National Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 52-6152779-001 |  |
PPA Zone Status | Yellow | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | $ 1,666 | $ 850 | 197
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | June 2017 |  |
OE Pension Trust Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 94-6090764-001 |  |
PPA Zone Status | Red | Red |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | $ 1,508 | $ 1,264 | 991
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | Varies through June 2020 |  |
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 | $ 1,358 | $ 7,671 | 4,227
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through June 2017 |  |
Laborers National Pension Fund [Member] | Maximum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2015 |  |
Laborers National Pension Fund [Member] | Minimum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2014 |  |
Operating Engineers Local 324 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 | $ 1,291 | $ 1,231 | 1,086
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | Varies through April 2018 |  |
Alaska Laborers -Employers Retirement Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 91-6028298-001 |  |
PPA Zone Status | Yellow | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | $ 1,216 | $ 181 |
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | January 2017 |  |
Local 697 IBEW and Electrical Industry Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 51-6133048-001 |  |
PPA Zone Status | Green | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | $ 1,207 | $ 1,066 | 200
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | May 2018 |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2015 |  |
Laborers District Council of W PA Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 25-6135576-001 |  |
PPA Zone Status | Red | Red |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | $ 876 | $ 21 |
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | June 2017 |  |
Midwest Operating Engineers Pension Trust Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 36-6140097-001 |  |
PPA Zone Status | Yellow | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | Implemented |  |
Contributions | $ 793 | $ 3,294 | 497
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | Varies through June 2017 |  |
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 | $ 659 | $ 513 | 516
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | January 2017 |  |
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 | $ 33 | $ 513 | 1,816
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 | 2014 |  |
Michigan Upper Peninsula Intrl Brotherhood of Elec Workers Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 36-3020872-001 |  |
PPA Zone Status | Green | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions |  | $ 300 | 1,307
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | N/A |  |
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 | 2015 |  |
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 | 2014 |  |
All Other Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 27,201 | $ 20,475 | $ 21,055
Local Union No. 9 IBEW and Outside Contractors Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2015 |  |
Alaska Plumbing and Pipefitting Industry Pension Fund [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2015 |  |
Teamsters National Pipe Line Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2015 |  |

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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=65877416&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=65877416&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=65877416&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=65877416&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=65877416&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=65877416&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=65877416&loc=SL14450657-114947 + Details
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