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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Balance, January 1 $ 28,176 $ 19,748
Goodwill acquired 21,424 8,428
Balance, December 31 $ 49,600 $ 28,176