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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]      
Impairment charges $ 0 $ 0 $ 0
Amortization of intangible assets $ 6,764,000 $ 4,945,000 $ 2,139,000