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Subsequent Events - Additional Information (Detail)	1 Months Ended					1 Months Ended
	Feb. 28, 2012 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Mar. 22, 2013 Corporate Joint Venture Zhejiang Vanke Noah Assets Management Company Limited USD ($)	Mar. 22, 2013 Corporate Joint Venture Zhejiang Vanke Noah Assets Management Company Limited CNY	Feb. 28, 2013 Dividend Declared USD ($)	Feb. 28, 2013 Dividend Declared American Depositary Share USD ($)
Subsequent Event [Line Items]
First annual cash dividend declared	$ 0.28					$ 0.28	$ 0.14
First annual cash dividend declared, payable date						2013-04
First annual cash dividend declared, record date						Mar. 20, 2013
Percentage of Ownership				51.00%	51.00%
Equity interest investments		$ 6,055,343	$ 2,434,689	$ 4,100,000	25,500,000

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 32

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Topic 210

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