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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Beginning balance, Goodwill Gross Carrying Amount | $ 731,272 | $ 735,323
Acquired goodwill | 471,727 |
Foreign currency translation, Gross Carrying Amount | (4,632) | (4,051)
Ending balance, Goodwill Gross Carrying Amount | 1,198,367 | 731,272
Beginning balance, Accumulated Impairment Loss | (144,276) | (144,276)
Ending balance, Accumulated Impairment Loss | (144,276) | (144,276)
Beginning balance, Goodwill Net | 586,996 | 591,047
Acquired goodwill | 471,727 |
Foreign currency translation, Net | (4,632) | (4,051)
Ending balance, Goodwill Net | $ 1,054,091 | $ 586,996

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