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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill impairment $ 0 $ 0  
Amortization of Intangible Assets $ 6,000,000 $ 6,200,000 $ 3,200,000