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Distribution of Profits - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 09, 2013 | Feb. 25, 2013 | Apr. 15, 2012 | Feb. 28, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Workers' Compensation Insurance and Reserves [Line Items] |  |  |  |  |  |
Profit after taxation transferred to general reserve fund |  |  |  |  | 10.00%noah_RequiredPercentageOfEntitysAfterTaxProfitsToAllocateToStatutoryCommonReserve |
Maximum profit after taxation transferred to general reserve fund |  |  |  |  | 50.00%noah_MaximumRequirementOfEachOfEntitysSubsidiariesAfterTaxProfitsToBeAllocatedToGeneralReserveFundAsPercentageOfEachSubsidiariesRegisteredCapital |
General reserve fund of PRC subsidiaries |  |  |  |  | $ 15,893,941 noah_LegalReserves | $ 8,638,712 noah_LegalReserves
Restricted share capital of PRC subsidiaries |  |  |  |  | 105,571,519 us-gaap_EquityRestrictions | 86,907,832 us-gaap_EquityRestrictions
Restricted net assets |  |  |  |  | 121,465,460 us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries | 95,546,544 us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
Cash dividend declared |  | $ 0.28 us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.28 us-gaap_CommonStockDividendsPerShareDeclared |  |
Number of american depositary shares in each ordinary share |  | 2 noah_NumberOfAmericanDepositarySharesInEachOrdinaryShare |  | 2 noah_NumberOfAmericanDepositarySharesInEachOrdinaryShare |  |
Dividend distribution | 7,700,000 us-gaap_PaymentsOfDividendsCommonStock |  | 7,900,000 us-gaap_PaymentsOfDividendsCommonStock |  |  |
Dividend, date of record |  | Mar. 20, 2013 |  | Mar. 20, 2012 |  |
American Depositary Shares |  |  |  |  |  |
Workers' Compensation Insurance and Reserves [Line Items] |  |  |  |  |  |
Cash dividend declared |  | $ 0.14 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = noah_AmericanDepositarySharesMember |  | $ 0.14 us-gaap_CommonStockDividendsPerShareDeclared / us-gaap_StatementClassOfStockAxis = noah_AmericanDepositarySharesMember |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |
Workers' Compensation Insurance and Reserves [Line Items] |  |  |  |  |  |
Restricted net assets |  |  |  |  | $ 49,330,429 us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | $ 21,254,726 us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember

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