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Share-based Awards - Additional Information (Detail) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Employee Stock Plan, 2008 Plan
Jun. 30, 2013
Employee Stock Plan, 2008 Plan
Individual Employee
Jun. 30, 2013
Employee Stock Plan, 2008 Plan
Minimum
Jun. 30, 2013
Employee Stock Plan, 2003 Plan
Jun. 30, 2013
Employee Stock Plan, 2003 Plan
Individual Employee
Jul. 21, 2008
Restricted Stock Units 2008
Apr. 23, 2013
Restricted Stock Units And Performance Stock Units 2013
Jun. 30, 2013
Employee Stock Option
Jun. 30, 2012
Employee Stock Option
Jun. 30, 2013
Employee Stock Option
Minimum
Jun. 30, 2013
Employee Stock Option
Maximum
Jun. 30, 2013
Restricted Stock Units (RSUs)
Jun. 30, 2012
Restricted Stock Units (RSUs)
Jun. 30, 2013
Performance Share Unit (PSUs)
Minimum
Jun. 30, 2013
Performance Share Unit (PSUs)
Maximum
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 1,000,000 1,600,000                
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 18 days     8 years        
Options granted fair value                       $ 3.68 $ 13.93        
Weighted average fair value per option                   $ 8.81              
Exercisable - number of shares                   2,203,758              
Exercisable - weighted average remaining contractual life                   3 years 3 months 26 days              
Exercisable - weighted average exercise price                   $ 24.40              
Fully vested total intrinsic value                   24,300,000              
Intrinsic value of option exercised                   7,800,000 3,200,000            
Fair value of stock units vested                           1,100,000 0    
Number of shares expected to vest                                 369,020
Cumulative EPS vesting period                               2013 2015
Non-cash stock compensation expense not yet recognized 43,000,000                                
Unrecognized stock-based compensation expense, weighted average period (years) 2 years 10 months 24 days                                
Tax benefit on exercise of options $ 193,000 $ 900,000