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Deferred Revenues Related to Recurring Management Fee Received in Advance from Related Parties (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | $ 13,426,881 us-gaap_DeferredRevenue | $ 9,187,091 us-gaap_DeferredRevenue
Shanghai Gopher Languang Investment Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 5,189,571 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiGopherLanguangInvestmentManagementCompanyLimitedMember | 292,272 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiGopherLanguangInvestmentManagementCompanyLimitedMember
Wuhu Gopher Investment Management Company Limited |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 2,881,465 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_WuhuGopherInvestmentManagementCompanyLimitedMember | 924,018 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_WuhuGopherInvestmentManagementCompanyLimitedMember
Wanjia Win-Win Assets Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 2,624,558 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_WanjiaWinwinAssetsManagementCompanyLimitedMember | 1,774,667 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_WanjiaWinwinAssetsManagementCompanyLimitedMember
Gopher Asset Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 671,541 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherAssetManagementCoLtdMember | 1,100,107 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherAssetManagementCoLtdMember
Hangzhou Vanke Investment Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 559,587 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_HangzhouVankeInvestmentManagementCompanyLimitedMember | 2,130,255 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_HangzhouVankeInvestmentManagementCompanyLimitedMember
Kunshan Jingzhao Equity Investment Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 643,641 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_KunshanJingzhaoEquityInvestmentManagementLimitedMember | 201,902 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_KunshanJingzhaoEquityInvestmentManagementLimitedMember
Gopher Nuobao Asset Management Company Limited |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 383,320 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherNuobaoAssetManagementCompanyLimitedMember |
Chongqing Gopher Longxin Equity Investment Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 337,917 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ChongqingGopherLongxinEquityInvestmentManagementCompanyLimitedMember | 236,586 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ChongqingGopherLongxinEquityInvestmentManagementCompanyLimitedMember
Gopher Capital GP |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties | 135,281 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherCapitalGroupMember | 576,937 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherCapitalGroupMember
Sequoia Capital Investment Management Tianjin Company Limited |  |
Related Party Transaction [Line Items] |  |
Deferred revenue from related parties |  | $ 1,950,347 us-gaap_DeferredRevenue / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_SequoiaCapitalInvestmentManagementTianjinCompanyLimitedMember

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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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