XML 28 R87.htm IDEA: XBRL DOCUMENT v2.4.0.8
Summary of Options Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Shares arising out of options    
Outstanding, shares arising out of options, beginning balance 12,413,298  
Granted, shares arising out of options 3,483,000  
Forfeited, shares arising out of options (63,056)  
Expired, shares arising out of options (67,978)  
Exercised, shares arising out of options (3,784,851)  
Outstanding, shares arising out of options, ending balance 11,980,413 12,413,298
Vested and expected to vest thereafter, shares arising out of options 11,596,240 [1]  
Vested and exercisable, shares arising out of options 7,547,192  
Weighted average grant date fair value of grants during the year $ 19.35  
Weighted average exercise price    
Outstanding weighted average exercise price, beginning balance $ 9.29  
Granted, weighted average exercise price $ 19.35  
Forfeited, weighted average exercise price $ 10.47  
Expired, weighted average exercise price $ 13.79  
Exercised, weighted average exercise price $ 8.76  
Outstanding weighted average exercise price, ending balance $ 12.35 $ 9.29
Vested and expected to vest thereafter, weighted average exercise price $ 12.07 [1]  
Vested and exercisable, weighted average exercise price $ 9.27  
Weighted average remaining contractual life (years)    
Outstanding weighted average remaining contractual life (years) 5 years 3 months 26 days 4 years 2 months 12 days
Vested and expected to vest thereafter, weighted average remaining contractual life (years) 5 years 3 months 26 days [1]  
Vested and Exercisable, weighted average remaining contractual life (years) 3 years 2 months 27 days  
Aggregate intrinsic value    
Exercised, aggregate intrinsic value $ 38,149  
Outstanding aggregate intrinsic value, ending balance 80,652  
Vested and expected to vest thereafter, aggregate intrinsic value 80,471 [1]  
Vested and Exercisable, aggregate intrinsic value $ 72,524  
[1] Options expected to vest reflect an estimated forfeiture rate.