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Loans Payable - Additional Information (Detail)
In Millions, unless otherwise specified
1 Months Ended 1 Months Ended
Jul. 19, 2011
Goldman Sachs Loan
USD ($)
Jul. 19, 2011
Goldman Sachs Loan
CNY
Aug. 19, 2013
ANZ Loan
USD ($)
Aug. 19, 2013
ANZ Loan
AUD
Aug. 19, 2013
ANZ Loan
CNY
Oct. 17, 2012
ANZ Loan
USD ($)
Oct. 17, 2012
ANZ Loan
AUD
Oct. 17, 2012
ANZ Loan
CNY
Aug. 13, 2013
ANZ Loan
AUD
Aug. 13, 2013
ANZ Loan
CNY
Sep. 18, 2012
ANZ Loan
AUD
Sep. 18, 2012
ANZ Loan
CNY
Jul. 29, 2013
Sumitomo Mitsui Loan
USD ($)
Jul. 29, 2013
Sumitomo Mitsui Loan
CNY
Jul. 24, 2013
Sumitomo Mitsui Loan
USD ($)
Jul. 24, 2013
Sumitomo Mitsui Loan
CNY
Debt Instrument [Line Items]                                
Unsecured loan, maturity period (in years) 2 years 2 years 2 years 2 years 2 years 2 years 2 years 2 years         2 years 2 years    
Unsecured loan borrowed $ 350.00 2,120.00 $ 200.00     $ 56.76                    
Annual interest rate 1.30% 1.30% 1.65% 1.65% 1.65% 2.75% 2.75% 2.75%         1.17% 1.17%    
Debt, maturity date Jul. 14, 2013 Jul. 14, 2013                            
Specific amount up to which borrowings can be made under the commitment of a bank loan                 235.00 1,270.00 105.00 567.56     150.00 908.06
Amount borrowed under the commitment of a bank loan       235.00 1,270.00   55.00 297.29         150.00 908.06    
Loan commitment amount cancelled             50.00