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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, 2015	Dec. 31, 2014	Dec. 31, 2013
Multiemployer Plans [Line Items]
Contributions	$ 77,015	$ 71,204	$ 55,054
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	$ 21,200	$ 20,758	17,268
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Varies through September 2019
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	$ 7,671	$ 4,227	4,681
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	2014
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	2013
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	$ 6,087	$ 6,280	4,511
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	2014
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	2013
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	$ 5,677	$ 7,847	4,259
Surcharge Imposed	No
Expiration Date of Collective Bargaining Agreement	Varies through 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	$ 3,294	$ 497	217
Surcharge Imposed	Yes
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	$ 2,603	$ 1,357	987
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	$ 2,544	$ 2,192	1,790
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	2014
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	2013
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	$ 1,264	$ 991	902
Surcharge Imposed	Yes
Expiration Date of Collective Bargaining Agreement	June 2016
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	$ 1,231	$ 1,086	818
Surcharge Imposed	Yes
Expiration Date of Collective Bargaining Agreement	Varies through June 2017
Local 697 IBEW and Electrical Industry Pension Fund [Member]
Multiemployer Plans [Line Items]
Employer Identification Number	51-6133048-001
PPA Zone Status	Yellow	Yellow
Subject to Financial Improvement/ Rehabilitation Plan	Implemented
Contributions	$ 1,066	$ 200
Surcharge Imposed	Yes
Expiration Date of Collective Bargaining Agreement	May 2018
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	$ 513	$ 1,816	222
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
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	$ 513	$ 516	241
Surcharge Imposed	Yes
Expiration Date of Collective Bargaining Agreement	June 2017
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	$ 300	$ 1,307	299
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	2014
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	2013
All Other Plans [Member]
Multiemployer Plans [Line Items]
Contributions	$ 23,052	$ 22,130	$ 18,859

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Significant Periods Of Multiemployer Contributions Exceeding Specified Percentage

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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=49170332&loc=SL14450702-114947

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 715
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-URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450691-114947

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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
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=49170332&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
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=49170332&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
-SubTopic 80
-Section 50
-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
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450657-114947

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