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Goodwill - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]        
Impairment losses $ 0 $ 0 $ 0 $ 0