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Stock-Based Compensation - Summary of Stock Option Awards (Detail) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options, Outstanding, Balance (shares) 3,220,147  
Options, Granted (shares) 0  
Options, Exercised (shares) (2,578)  
Options, Forfeited (shares) (144,418)  
Options, Outstanding, Balance (shares) 3,073,151 3,220,147
Options exercisable at June30, 2016 (shares) 2,704,617  
Weighted Average Exercise Price, Outstanding, Balance (in dollars per share) $ 13.12  
Weighted Average Exercise Price, Granted (in dollars per share) 0.00  
Weighted Average Exercise Price, Exercised (in dollars per share) 6.88  
Weighted Average Exercise Price, Forfeited (in dollars per share) 12.33  
Weighted Average Exercise Price, Outstanding, Balance (in dollars per share) 13.16 $ 13.12
Weighted Average Exercise Price, Options exercisable at June 30, 2016 (in dollars per share) $ 12.96  
Weighted Average Remaining Contractual Life, Outstanding 4 years 9 months 1 day 5 years 2 months 12 days
Weighted Average Remaining Contractual Life, Options exercisable at June 30, 2016 4 years 6 months 1 day  
Aggregate Intrinsic Value, Outstanding, Balance $ 2,109 $ 3,081
Aggregate Intrinsic Value, Outstanding, Options exercisable at June 30, 2016 $ 2,109