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Notes Payable - Additional Information (Detail)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Unsecured Senior Notes Due Two Thousand Seventeen
Nov. 28, 2012
Unsecured Senior Notes Due Two Thousand Seventeen
USD ($)
Dec. 31, 2013
Unsecured Senior Notes Due Two Thousand Twenty Two
Nov. 28, 2012
Unsecured Senior Notes Due Two Thousand Twenty Two
USD ($)
Dec. 31, 2013
Unsecured Senior Notes Due Twenty Eighteen
Nov. 28, 2012
Unsecured Senior Notes Due Twenty Eighteen
USD ($)
Dec. 31, 2013
Unsecured Senior Notes
USD ($)
Dec. 31, 2013
Unsecured Senior Notes
CNY
Dec. 31, 2012
Unsecured Senior Notes
CNY
Nov. 28, 2012
Unsecured Senior Notes
Tranche
Debt Instrument [Line Items]                    
Number of tranches issued and sold                   2
Debt face amount   $ 750,000,000   $ 750,000,000   $ 1,000,000,000        
Debt, maturity date Nov. 28, 2017   Nov. 28, 2022   Aug. 06, 2018          
Interest rate 2.25%   3.50%   3.25%          
Net proceeds from issuance of debt             1,000,000,000 6,070,000,000 9,300,000,000  
Discount on debt issued             3,380,000 20,470,000    
Debt issuance cost             $ 13,190,000 79,850,000    
Effective interest rate 2.36%   3.59%   3.39%