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Noah Investments Subsidiaries (Parenthetical) (Detail) (Gopher Asset Management Co., Ltd.)	Dec. 31, 2014
Gopher Asset Management Co., Ltd.
Variable Interest Entity [Line Items]
Equity Interest ownership	100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = noah_GopherAssetManagementCoLtdMember

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

+ Details

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Balance Type:	na
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- Details

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