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Deferred Rent Payable (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2011
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2012
CNY
Sep. 30, 2011
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2011
CNY
Dec. 31, 2010
USD ($)
Dec. 31, 2011
Deferred Rent Payable [Member]
USD ($)
Dec. 31, 2010
Deferred Rent Payable [Member]
USD ($)
Land use fee, per mu (in Yuan Renminbi)       60     60      
Land use fee, term     60 60   60 60      
Land use fee, increase percentage     10.00% 10.00%   10.00% 10.00%      
Land use fee, terms of price increase     5 5   5 5      
Other Deferred Cost, Amortization Expense     (13,541)   9,873          
Increase (Decrease) in Other Deferred Liability 6,760 3,335 4,472   (9,873) (13,243)   (4,049) (13,243) (4,836)
Other Liabilities, Noncurrent 54,122   54,122     58,949   43,169    
Land use fee per sm           $ 40,000