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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |  |  |
Goodwill, beginning balance |  | $ 1,596,695 | $ 1,445,927 |
Goodwill acquired |  | 51,860 | 174,485 |
Purchase price allocation adjustments |  | (8,117) |  |
Goodwill impaired | $ (39,800) | (39,826) |  |
Foreign currency translation adjustments |  | (47,954) | (23,717) |
Goodwill | 1,592,551 | 1,592,551 |  |
Accumulated impairment | (39,893) | (39,893) |  |
Goodwill, ending balance | 1,552,658 | 1,552,658 | 1,596,695 | $ 1,445,927
Electric Power Division [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, beginning balance |  | 1,223,224 | 1,168,084 |
Goodwill acquired |  | 31,224 | 71,517 | 112,500
Purchase price allocation adjustments |  | 750 |  |
Foreign currency translation adjustments |  | (28,953) | (16,377) |
Goodwill | 1,226,245 | 1,226,245 |  |
Goodwill, ending balance | 1,226,245 | 1,226,245 | 1,223,224 | 1,168,084
Oil and Gas Infrastructure Division [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, beginning balance |  | 373,471 | 277,843 |
Goodwill acquired |  | 20,636 | 102,968 | 143,300
Purchase price allocation adjustments |  | (8,867) |  |
Goodwill impaired |  | (39,826) |  |
Foreign currency translation adjustments |  | (19,001) | (7,340) |
Goodwill | 366,306 | 366,306 |  |
Accumulated impairment | (39,893) | (39,893) |  |
Goodwill, ending balance | $ 326,413 | $ 326,413 | $ 373,471 | $ 277,843

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