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Summary of Subsidiaries (Detail) | 12 Months Ended
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Dec. 31, 2014
Shanghai Noah Rongyao Investment Consulting Co., Ltd. |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Aug. 24, 2007 |
Place of Incorporation | PRC |
Percentage of Ownership | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_ShanghaiNoahRongyaoInvestmentConsultingCompanyLimitedMember |
Shanghai Noah Financial Services Co., Ltd. |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Apr. 18, 2008 | [1]
Place of Incorporation | PRC | [1]
Percentage of Ownership | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_ShanghaiNoahFinancialServicesCompanyLimitedMember | [1]
Tianjin Noah Wealth Management Consulting Co., Ltd. |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Dec. 26, 2008 |
Place of Incorporation | PRC |
Percentage of Ownership | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_TianjinNoahWealthManagementConsultingCoLtdMember |
Kunshan Noah Xingguan Investment Management Co., Ltd. |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Aug. 12, 2011 |
Place of Incorporation | PRC |
Percentage of Ownership | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_KunshanNoahXingguanInvestmentManagementCompanyLimitedMember |
Noah Holdings (Hong Kong) Limited |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Sep. 01, 2011 |
Place of Incorporation | Hong Kong |
Percentage of Ownership | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_NoahHoldingsHongKongLimitedMember |
Shanghai Rongyao Information Technology Co., Ltd. |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Mar. 02, 2012 |
Place of Incorporation | PRC |
Percentage of Ownership | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_ShanghaiRongyaoInformationTechnologyCompanyLimitedMember |
Noah Financial Express (Wuhu) Microfinance Co., Ltd. |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Aug. 13, 2013 |
Place of Incorporation | PRC |
Percentage of Ownership | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_NoahFinancialExpressWuhuMicrofinanceCoLtdMember |
Noah Commercial Factoring Co., Ltd. |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Apr. 01, 2014 |
Place of Incorporation | PRC |
Percentage of Ownership | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_NoahCommercialFactoringCoLtdMember |
Shanghai Noah Yijie Finance Technology Co., Ltd |  |
Subsidiary of Limited Liability Company or Limited Partnership [Line Items] |  |
Date of Incorporation | Mar. 17, 2014 |
Place of Incorporation | PRC |
Percentage of Ownership | 90.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = noah_ShanghaiNoahYijieFinanceTechnologyCompanyLimitedMember |
[1] | In August 2012, Shanghai Noah Yuanzheng Investment Consulting Co., Ltd. was renamed as Shanghai Noah Financial Service Co., Ltd., after it obtained the regulatory approval to authorize its business scope to include providing investment advisory, wealth management and related financial services.

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