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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

X

- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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