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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]        
Intangible amortization expenses $ 595 $ 737 $ 1,977 $ 2,231