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Debt - Additional Information (Detail) (USD $)
6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jan. 31, 2012
Jan. 31, 2012
Convertible Debt
Jun. 30, 2012
Convertible Debt
Jun. 30, 2012
Convertible Debt
Jun. 30, 2012
Convertible Debt
Proceeds
Jun. 30, 2012
Convertible Debt
Debt Offering
Jun. 30, 2012
Convertible Debt
Debt Offering
Jun. 30, 2012
Convertible Debt
American Depository Shares
Jan. 31, 2012
3.5% exchangeable senior notes due 2032
Finance
Jan. 09, 2012
3.5% exchangeable senior notes due 2032
Finance
Jul. 31, 2012
3.5% exchangeable senior notes due 2032
Finance
Interest Expense
Debt Disclosure [Line Items]                          
Convertible senior notes, principal amount       $ 150,000,000                  
Convertible senior notes, stated interest rate       3.50%               3.50%  
Convertible senior notes, due date       2032                  
Convertible senior notes, net proceeds 144,316,000     144,316,000             144,316,000    
Convertible senior notes, exchange rate of ADS per $1,000 principal amount of notes                   113.4752      
Convertible senior notes, total ADS into which the debt is exchangeable                   17,021,280      
Convertible senior notes, payment start date       Jul. 15, 2012                  
Convertible senior notes, maturity date       Jan. 15, 2032             Jan. 15, 2032    
Value of shares in excess of principal amount of Notes based on closing price 96,100,000                        
Additional interest rate on notes per annum         0.50% 0.50%              
Convertible senior notes, repurchase price at option of the issuer     100.00%                    
Proceeds allocated to conversion option           23,800,000              
Fair value of the liability component       150,000,000 126,200,000 126,200,000              
Note, estimated remaining life           24 months              
Effective interest rate           13.50%              
Unamortized debt discount         3,800,000 3,800,000 18,800,000            
Debt discount amortization period           24 months              
Convertible senior notes, carrying amount net of unamortized discount         127,400,000 127,400,000              
Convertible senior notes, interest expense         4,500,000 8,500,000              
Interest expense, contractual coupon interest accrual         2,700,000 5,000,000              
Interest expense, amortization of discount         1,300,000 2,500,000   500,000 1,000,000        
Accrued interest on convertible note         2,700,000 2,700,000              
Interest payment on notes                           $ 2,700,000