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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill $ 139,304 $ 139,304
Trade names, Gross Carrying Amount 27,979 27,979
Goodwill and Trade name, Gross Carrying Amount 167,283 167,283
Accumulated Amortization (6,856) (6,322)
Trade names, Net Carrying Amount 21,123 21,657
Goodwill and Trade name, Net Carrying Amount $ 160,427 $ 160,961