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Goodwill and Other Intangibles - Summary of the Activity in the Companys Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Balance at beginning of year $ 23,546  
Acquisitions 17,920 $ 23,546
Balance at end of year $ 41,466 $ 23,546