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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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 (6,322) (5,788)
Trade names, Net Carrying Amount 21,657 22,191
Goodwill and Trade name, Net Carrying Amount $ 160,961 $ 161,495