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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |
Goodwill, beginning balance | $ 1,596,695 |
Goodwill acquired | 30,310 |
Purchase price allocation adjustments | (8,113) |
Foreign currency translation adjustments | (20,238) |
Goodwill, ending balance | 1,598,654 | $ 1,596,695
Electric Power Division [Member] |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 1,223,224 |
Goodwill acquired | 13,509 | 72,300
Purchase price allocation adjustments | 750 |
Foreign currency translation adjustments | (12,422) |
Goodwill, ending balance | 1,225,061 | 1,223,224
Oil and Gas Infrastructure Division [Member] |  |
Goodwill [Line Items] |  |
Goodwill, beginning balance | 373,471 |
Goodwill acquired | 16,801 | 94,100
Purchase price allocation adjustments | (8,863) |
Foreign currency translation adjustments | (7,816) |
Goodwill, ending balance | $ 373,593 | $ 373,471

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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