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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 735,323 | $ 727,999
Sale of business, Gross Carrying Amount |  | (3,115)
Foreign currency translation, Gross Carrying Amount | (3,186) | 10,439
Ending balance, Goodwill Gross Carrying Amount | 732,137 | 735,323
Beginning balance, Accumulated Impairment Loss | (144,276) | (139,414)
Impairment loss, Accumulated Impairment Loss |  | (4,862)
Foreign currency translation, Accumulated Impairment Loss | 0 | 0
Ending balance, Accumulated Impairment Loss | (144,276) | (144,276)
Beginning balance, Goodwill Net | 591,047 | 588,585
Sale of business, Net |  | (3,115)
Impairment loss, Net |  | (4,862)
Foreign currency translation, Net | (3,186) | 10,439
Ending balance, Goodwill Net | $ 587,861 | $ 591,047

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