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Organization and Principal Activities - Additional Information (Parenthetical) (Detail) (Tianjin Gopher Asset Management Co., Ltd.) | Dec. 31, 2014
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Tianjin Gopher Asset Management Co., Ltd. |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |
Equity interest sold to Gopher Asset | 100.00%noah_EquityMethodInvestmentOwnershipPercentageSold / dei_LegalEntityAxis = noah_TianjinGopherAssetManagementCoLtdMember

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- Definition Equity Method Investment, Ownership Percentage Sold + References No definition available. + Details
Name: | noah_EquityMethodInvestmentOwnershipPercentageSold
Namespace Prefix: | noah_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration