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Debt - Additional Information (Detail) (USD $)
 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
Jan. 31, 2012
Jan. 31, 2012
Convertible Debt
Sep. 30, 2012
Convertible Debt
Sep. 30, 2012
Convertible Debt
Sep. 30, 2012
Convertible Debt
Proceeds
Sep. 30, 2012
Convertible Debt
Debt Offering
Sep. 30, 2012
Convertible Debt
Debt Offering
Sep. 30, 2012
Convertible Debt
American Depository Shares
Jul. 31, 2012
3.5% exchangeable senior notes due 2032
Finance
Jan. 31, 2012
3.5% exchangeable senior notes due 2032
Finance
Jan. 09, 2012
3.5% exchangeable senior notes due 2032
Finance
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   144,300,000               144,300,000  
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 64,100,000                      
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       3,200,000 3,200,000 16,000,000            
Debt discount amortization period         24 months              
Convertible senior notes, carrying amount net of unamortized discount       130,800,000 130,800,000              
Convertible senior notes, interest expense       4,700,000 13,200,000              
Interest expense, contractual coupon interest accrual       2,800,000 7,800,000              
Interest expense, amortization of discount       1,300,000 3,800,000   600,000 1,600,000        
Accrued interest on convertible note       1,100,000 1,100,000              
Interest payment on notes $ 2,713,000                 $ 2,700,000