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Goodwill and Other Intangible Assets - Summary of Changes in Goodwill (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | $ 1,966,432 |
Accumulated impairment, beginning balance | (97,832) |
Goodwill, beginning balance | 1,868,600 |
Goodwill acquired | 55,049 | $ 55,000
Purchase price allocation adjustments | 51 |
Foreign currency translation adjustments | (11,561) |
Goodwill gross, ending balance | 1,912,139 | 1,912,139
Accumulated impairment, ending balance | 0 | 0
Goodwill, ending balance | 1,912,139 | 1,912,139
Electric Power Infrastructure Services Division |  |
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | 1,272,527 |
Accumulated impairment, beginning balance | 0 |
Goodwill, beginning balance | 1,272,527 |
Goodwill acquired | 55,049 |
Purchase price allocation adjustments | 51 |
Foreign currency translation adjustments | (6,875) |
Goodwill gross, ending balance | 1,320,752 | 1,320,752
Accumulated impairment, ending balance | 0 | 0
Goodwill, ending balance | 1,320,752 | 1,320,752
Oil and Gas Infrastructure Services Division |  |
Goodwill [Roll Forward] |  |
Goodwill gross, beginning balance | 693,905 |
Accumulated impairment, beginning balance | (97,832) |
Goodwill, beginning balance | 596,073 |
Goodwill acquired | 0 |
Purchase price allocation adjustments | 0 |
Foreign currency translation adjustments | (4,686) |
Goodwill gross, ending balance | 591,387 | 591,387
Accumulated impairment, ending balance | 0 | 0
Goodwill, ending balance | $ 591,387 | $ 591,387

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