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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Goodwill [Line Items] |  |
Goodwill gross, beginning balance | $ 1,592,551 |
Goodwill, beginning balance | 1,552,658 |
Goodwill acquired | 26,116 | $ 51,641
Purchase price allocation adjustments | (214) |
Foreign currency translation adjustments | 16,995 |
Goodwill gross, ending balance | 1,635,740 | 1,592,551
Accumulated impairment | (40,185) | (39,893)
Goodwill, ending balance | 1,595,555 | 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 | 5,829 |
Foreign currency translation adjustments | 10,702 |
Goodwill gross, ending balance | 1,242,776 | 1,226,245
Goodwill, ending balance | 1,242,776 | 1,226,245
Oil and Gas Infrastructure Division [Member] |  |
Goodwill [Line Items] |  |
Goodwill gross, beginning balance | 366,306 |
Goodwill, beginning balance | 326,413 |
Goodwill acquired | 20,287 |
Purchase price allocation adjustments | (214) |
Foreign currency translation adjustments | 6,293 |
Goodwill gross, ending balance | 392,964 | 366,306
Accumulated impairment | (40,185) | (39,893)
Goodwill, ending balance | $ 352,779 | $ 326,413

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