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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
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 55,054 | $ 63,572 | $ 45,202
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 | 17,268 | 18,509 | 9,704
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through May 2017 |  |
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 | 4,681 | 1,906 | 1,903
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | May 2014 |  |
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 | 4,511 | 7,434 | 101
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through May 2014 |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2012 |  |
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 | 4,259 | 6,843 | 4,439
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | May 2014 |  |
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 | 1,790 | 4,415 | 3,533
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Varies through August 2016 |  |
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 | 2012 |  |
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 | 2011 |  |
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 | 818 | 135 |
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | Varies through April 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 | 222 | 515 | 2,887
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | May 2014 |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2011 |  |
NECA-IBEW Pension Trust [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 51-6029903-001 |  |
PPA Zone Status | Green | Green |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions | 7 | 19 | 6,707
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | May 2014 |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2011 |  |
IBEW Local 246 Pension Plan [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Employer Identification Number | 34-6582842-001 |  |
PPA Zone Status | Yellow | Yellow |
Subject to Financial Improvement/ Rehabilitation Plan | No |  |
Contributions |  | 130 | 1,977
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | October 2012 |  |
IBEW Local 246 Pension Plan [Member] | Maximum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2012 |  |
IBEW Local 246 Pension Plan [Member] | Minimum [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Plan years in which Quanta contributions were five percent or more of total plan contributions | 2011 |  |
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 | 540
Surcharge Imposed | Yes |  |
All Other Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 21,498 | $ 23,644 | $ 13,411

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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=14450570&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=14450570&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=14450570&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=14450570&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=14450570&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=14450570&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=14450570&loc=SL14450657-114947 + Details
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