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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |
Goodwill gross, beginning balance | $ 1,592,551 |
Accumulated impairment, beginning balance | (39,893) |
Goodwill, beginning balance | 1,552,658 |
Goodwill acquired | 44,610 | $ 51,935
Purchase price allocation adjustments | 79 |
Foreign currency translation adjustments | 14,891 |
Goodwill gross, ending balance | 1,652,793 | 1,592,551
Accumulated impairment, ending balance | (40,555) | (39,893)
Goodwill, ending balance | 1,612,238 | 1,552,658
Electric Power Division [Member] |  |
Goodwill [Line Items] |  |
Goodwill gross, beginning balance | 1,226,245 |
Goodwill, beginning balance | 1,226,245 |
Goodwill acquired | 24,074 |
Purchase price allocation adjustments | 293 |
Foreign currency translation adjustments | 9,073 |
Goodwill gross, ending balance | 1,259,685 | 1,226,245
Goodwill, ending balance | 1,259,685 | 1,226,245
Oil and Gas Infrastructure Division [Member] |  |
Goodwill [Line Items] |  |
Goodwill gross, beginning balance | 366,306 |
Accumulated impairment, beginning balance | (39,893) |
Goodwill, beginning balance | 326,413 |
Goodwill acquired | 20,536 |
Purchase price allocation adjustments | (214) |
Foreign currency translation adjustments | 5,818 |
Goodwill gross, ending balance | 393,108 | 366,306
Accumulated impairment, ending balance | (40,555) | (39,893)
Goodwill, ending balance | $ 352,553 | $ 326,413

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