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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Apr. 01, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 41,466,000 $ 23,546,000 $ 23,546,000
Goodwill impairment $ 0 $ 0  
Weighted average useful life of intangible assets acquired 13 years 13 years