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Fair Value Measurement of Assets and Liabilities - Fair Value of Financial Assets and Liabilities Measured at Amortized Cost (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Carrying Value [Member]
   
Assets    
Assets $ 165,542,669 $ 162,634,066
Liabilities    
Liabilities 198,394,514 167,447,637
Carrying Value [Member] | Accounts and Funds Payable [Member]
   
Liabilities    
Liabilities 145,838,048 125,449,275
Carrying Value [Member] | Salaries and Social Security Payable [Member]
   
Liabilities    
Liabilities 15,571,049 14,994,186
Carrying Value [Member] | Tax Payable [Member]
   
Liabilities    
Liabilities 15,371,128 19,210,568
Carrying Value [Member] | Dividends Payable [Member]
   
Liabilities    
Liabilities 6,313,869 4,812,396
Carrying Value [Member] | Other Liabilities [Member]
   
Liabilities    
Liabilities 15,300,420 2,981,212
Carrying Value [Member] | Time Deposits [Member]
   
Assets    
Assets 61,725,464 87,379,121
Carrying Value [Member] | Accounts and Credit Cards Receivable [Member]
   
Assets    
Assets 82,942,389 55,653,528
Carrying Value [Member] | Prepaid Expenses and Other Assets [Member]
   
Assets    
Assets 20,874,816 19,601,417
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Assets    
Assets 165,542,669 162,634,066
Liabilities    
Liabilities 198,394,514 167,447,637
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Accounts and Funds Payable [Member]
   
Liabilities    
Liabilities 145,838,048 125,449,275
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Salaries and Social Security Payable [Member]
   
Liabilities    
Liabilities 15,571,049 14,994,186
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Tax Payable [Member]
   
Liabilities    
Liabilities 15,371,128 19,210,568
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Dividends Payable [Member]
   
Liabilities    
Liabilities 6,313,869 4,812,396
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Liabilities [Member]
   
Liabilities    
Liabilities 15,300,420 2,981,212
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Time Deposits [Member]
   
Assets    
Assets 61,725,464 87,379,121
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Accounts and Credit Cards Receivable [Member]
   
Assets    
Assets 82,942,389 55,653,528
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Assets [Member]
   
Assets    
Assets $ 20,874,816 $ 19,601,417