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Revenue by Type of Service (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net revenues $ 86,695,506 $ 72,163,326 $ 37,863,559
One Time Commissions
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net revenues 46,193,749 49,624,166 29,248,348
Recurring Services Fees
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net revenues 39,584,531 22,539,160 8,615,211
Mutual fund service fee
     
Segment Reporting, Revenue Reconciling Item [Line Items]      
Net revenues $ 917,226