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Share-based Awards - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Employee Stock Plan, 2008 Plan
Mar. 31, 2013
Employee Stock Plan, 2008 Plan
Individual Employee
Mar. 31, 2013
Employee Stock Plan, 2008 Plan
Minimum
Mar. 31, 2013
Stock Option
Mar. 31, 2012
Stock Option
Mar. 31, 2013
Stock Option
Minimum
Mar. 31, 2013
Stock Option
Maximum
Mar. 31, 2013
Restricted Stock Units (RSUs)
Mar. 31, 2012
Restricted Stock Units (RSUs)
Mar. 31, 2013
Employee Stock Plan, 2003 Plan
Mar. 31, 2013
Employee Stock Plan, 2003 Plan
Individual Employee
Apr. 23, 2013
Restricted Stock Units 2013
Subsequent Event
Jul. 21, 2008
Restricted Stock Units 2008
Compensation Related Costs Share Based Payments Disclosure [Line Items]                              
Percentage of option price for fair value of ordinary share         100.00%                    
Ordinary shares which have been reserved for issuance     6,000,000 400,000               6,000,000 400,000 1,600,000 1,000,000
Maximum number of award as percentage of shares outstanding                       10.00%      
Shares vesting period           5 years                  
Shares expiration period           8 years                  
Weighted Average Remaining Contractual Life of Options Outstanding           4 years 6 months 7 days     8 years            
Options granted fair value               $ 3.68 $ 13.93            
Weighted average fair value per option           $ 8.71                  
Exercisable - number of shares           2,390,668                  
Exercisable - weighted average remaining contractual life           3 years 4 months 24 days                  
Exercisable - weighted average exercise price           $ 24.32                  
Fully vested total intrinsic value           21,400,000                  
Intrinsic value of option exercised           3,500,000 800,000                
Fair value of RSU's vested                   0 0        
Non-cash stock compensation expense not yet recognized 17,900,000                            
Unrecognized stock-based compensation expense, weighted average period (years) 3 years                            
Tax benefit on exercise of options $ 251,000 $ 400,000