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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Intangible Assets, Net (Excluding Goodwill) [Abstract]        
Amortization of intangible assets $ 8,094 $ 8,650 $ 23,730 $ 25,674