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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]        
Intangible amortization expenses $ 1,974 $ 2,567 $ 2,556 $ 1,306