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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
	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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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

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-Publisher FASB
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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
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-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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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
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-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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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
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-Paragraph 5
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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
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