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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, 2017 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |  |
Goodwill gross, beginning balance |  |  | $ 1,642,902 | $ 1,592,551
Accumulated impairment, beginning balance |  |  | (39,733) | (39,893)
Goodwill net, beginning balance |  |  | 1,603,169 | 1,552,658
Goodwill acquired |  |  | 302,408 | 45,186
Purchase price allocation adjustments |  |  | (1,278) | 15
Goodwill impairments | $ (57,000) | $ (39,800) | (57,011) |
Foreign currency translation adjustments |  |  | 21,312 | 5,310
Goodwill gross, ending balance | 1,966,432 | 1,592,551 | 1,966,432 | 1,642,902
Accumulated impairment, ending balance | (97,832) | (39,893) | (97,832) | (39,733)
Goodwill net, ending balance | 1,868,600 | 1,552,658 | 1,868,600 | 1,603,169
Electric Power Infrastructure Services Division |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill gross, beginning balance |  |  | 1,253,979 | 1,226,245
Accumulated impairment, beginning balance |  |  | 0 | 0
Goodwill net, beginning balance |  |  | 1,253,979 | 1,226,245
Goodwill acquired |  |  | 5,866 | 24,168
Purchase price allocation adjustments |  |  | (619) | 229
Goodwill impairments |  |  | 0 |
Foreign currency translation adjustments |  |  | 13,301 | 3,337
Goodwill gross, ending balance | 1,272,527 | 1,226,245 | 1,272,527 | 1,253,979
Accumulated impairment, ending balance | 0 | 0 | 0 | 0
Goodwill net, ending balance | 1,272,527 | 1,226,245 | 1,272,527 | 1,253,979
Oil and Gas Infrastructure Services Division |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill gross, beginning balance |  |  | 388,923 | 366,306
Accumulated impairment, beginning balance |  |  | (39,733) | (39,893)
Goodwill net, beginning balance |  |  | 349,190 | 326,413
Goodwill acquired |  |  | 296,542 | 21,018
Purchase price allocation adjustments |  |  | (659) | (214)
Goodwill impairments |  |  | (57,011) |
Foreign currency translation adjustments |  |  | 8,011 | 1,973
Goodwill gross, ending balance | 693,905 | 366,306 | 693,905 | 388,923
Accumulated impairment, ending balance | (97,832) | (39,893) | (97,832) | (39,733)
Goodwill net, ending balance | $ 596,073 | $ 326,413 | $ 596,073 | $ 349,190

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