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Goodwill and Other Intangible Assets, net - Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Roll Forward]      
Balance, beginning of period $ 29,753 $ 29,753 $ 23,435
Acquisition 0 0  
Balance, end of period $ 29,753 $ 29,753 29,753
Clara Ehf. [Member]      
Goodwill [Roll Forward]      
Acquisition     3,161
StreamOnce, Inc. [Member]      
Goodwill [Roll Forward]      
Acquisition     $ 3,157