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Goodwill and Intangible Assets - Schedule of Change in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning of year $ 27,095 $ 21,720
Acquired goodwill   5,121
Impairment 0 0
Other adjustments 0 0
End of period $ 27,095 $ 26,841