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Goodwill - Changes in the Carrying Value of Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 21, 2015
Dec. 31, 2015
Goodwill [Roll Forward]    
Goodwill, Beginning Balance   $ 77,388
Goodwill $ 4,060 4,060
Goodwill, Ending Balance   $ 81,448