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Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Shares arising out of options    
Outstanding, shares arising out of options, beginning balance 5,986,845  
Granted, shares arising out of options 0  
Forfeited, shares arising out of options (25,000)  
Expired, shares arising out of options 0  
Exercised, shares arising out of options (248,316)  
Outstanding, shares arising out of options, ending balance 5,713,529 5,986,845
Vested and expected to vest thereafter, shares arising out of options [1] 5,541,849  
Vested and exercisable, shares arising out of options 3,492,030  
Weighted average grant date fair value of grants during the period $ 0  
Weighted average exercise price    
Outstanding weighted average exercise price, beginning balance 16.99  
Granted, weighted average exercise price 0  
Forfeited, weighted average exercise price 19.35  
Expired, weighted average exercise price 0  
Exercised, weighted average exercise price 16.96  
Outstanding weighted average exercise price, ending balance 16.98 $ 16.99
Vested and expected to vest thereafter, weighted average exercise price [1] 16.76  
Vested and exercisable, weighted average exercise price $ 15.34  
Weighted average remaining contractual life (years)    
Outstanding weighted average remaining contractual life (years) 5 years 6 months 5 years 9 months 18 days
Vested and expected to vest thereafter, weighted average remaining contractual life (years) [1] 5 years 6 months  
Vested and exercisable, weighted average remaining contractual life (years) 4 years 3 months 18 days  
Aggregate intrinsic value    
Exercised, aggregate intrinsic value $ 0  
Outstanding aggregate intrinsic value, ending balance 59,157  
Vested and expected to vest thereafter, aggregate intrinsic value [1] 57,790  
Vested and exercisable, aggregate intrinsic value $ 41,382  
[1] Options expected to vest reflect an estimated forfeiture rate.