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Amounts Due from Related Parties (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Related Party Transaction [Line Items] |  |
Amounts due from related parties | $ 31,085,548 us-gaap_DueFromRelatedParties | $ 8,924,824 us-gaap_DueFromRelatedParties
Wanjia Win-Win Assets Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 8,330,419 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_WanjiaWinwinInvestmentManagementLimitedMember | 3,005,600 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_WanjiaWinwinInvestmentManagementLimitedMember
Wuhu Gopher Asset Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 3,731,866 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_WuhuGopherAssetManagementCompanyLimitedMember | 856,879 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_WuhuGopherAssetManagementCompanyLimitedMember
Gopher Capital GP |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 3,535,483 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherCapitalGroupMember | 738,725 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherCapitalGroupMember
Kunshan Jingzhao Equity Investment Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 3,264,336 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_KunshanJingzhaoEquityInvestmentManagementLimitedMember | 2,704,988 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_KunshanJingzhaoEquityInvestmentManagementLimitedMember
Shanghai Gopher Languang Investment Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 2,244,540 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiGopherLanguangInvestmentManagementCompanyLimitedMember | 729,933 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiGopherLanguangInvestmentManagementCompanyLimitedMember
Gopher Asset Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 1,494,061 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherAssetManagementCoLtdMember |
Hangzhou Vanke Investment Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 1,054,369 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_HangzhouVankeInvestmentManagementCompanyLimitedMember | 778,562 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_HangzhouVankeInvestmentManagementCompanyLimitedMember
Gopher Nuobao Asset Management Company Limited |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 174,865 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_GopherNuobaoAssetManagementCompanyLimitedMember |
Chongqing Gopher Longxin Equity Investment Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 1,057 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ChongqingGopherLongxinEquityInvestmentManagementCompanyLimitedMember | 1,082 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ChongqingGopherLongxinEquityInvestmentManagementCompanyLimitedMember
Shanghai Nuobang Asset Management Company Limited |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 280 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiNuobangAssetManagementCompanyLimitedMember |
Yiwu Xinguang Equity Investment Fund Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | 7,254,174 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_YiwuXinguangEquityInvestmentFundmanagementMember |
Tianjin Gopher Asset Management Co., Ltd. |  |
Related Party Transaction [Line Items] |  |
Amounts due from related parties | $ 98 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_TianjinGopherAssetManagementCoLtdMember | $ 109,055 us-gaap_DueFromRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_TianjinGopherAssetManagementCoLtdMember

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