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Related Party Transactions (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Related Party Transaction [Line Items] |  |
Donations | $ 2.4 noah_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 | 4 us-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. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 + Details
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- Details
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- Details
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Balance Type: |
Period Type: |