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Stock-Based Compensation - Unrecognized Compensation Cost Related to Non-Vested Stock-Based Awards Granted (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Total unrecognized compensation costs $ 9,549 $ 11,206 $ 9,711