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Notes Payable - Additional Information (Detail)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Unsecured Senior Notes
USD ($)
Dec. 31, 2012
Unsecured Senior Notes
CNY
Nov. 28, 2012
Unsecured Senior Notes
USD ($)
Tranche
Nov. 28, 2012
Unsecured Senior Notes
CNY
Dec. 31, 2012
Senior Unsecured Notes Due TwoThousand Seventeen
Nov. 28, 2012
Senior Unsecured Notes Due TwoThousand Seventeen
USD ($)
Dec. 31, 2012
Senior Unsecured Notes Due Two Thousand Twenty Two
Nov. 28, 2012
Senior Unsecured Notes Due Two Thousand Twenty Two
USD ($)
Debt Instrument [Line Items]                
Number of tranches issued and sold     2 2        
Debt face amount           $ 750,000,000   $ 750,000,000
Debt, maturity date         Nov. 28, 2017   Nov. 28, 2022  
Interest rate         2.25%   3.50%  
Net proceeds from issuance of debt 1,490,000,000 9,300,000,000            
Discount on debt issued     1,670,000 10,370,000        
Debt issuance cost $ 8,060,000 50,190,000            
Effective interest rate         2.36%   3.59%