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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]      
Accumulated goodwill impairment losses $ 0    
Amortization of intangible assets $ 831,000 $ 891,000 $ 2,171,000