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Related Party Transactions (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Donations	$ 2.4noah_DonationPaymentsMadeDuringPeriod
Shanghai Yafu Investment Consulting Co., Ltd.
Related Party Transaction [Line Items]
Ownership percentage	10.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember
Shanghai Yafu Investment Consulting Co., Ltd. | Subsidiaries
Related Party Transaction [Line Items]
Number of businesses acquired	4us-gaap_NumberOfBusinessesAcquired / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember

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- Definition

Donation Payments Made During Period

+ References

No definition available.

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- 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

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The number of businesses acquired by the entity during the period.

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