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Subsequent Events - Additional Information (Detail) (Subsequent Event, USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
	Mar. 31, 2015	Feb. 28, 2015
Shanghai Noah Yijie Finance Technology Co., Ltd. | SCC Venture V Holdco I, Ltd.
Subsequent Event [Line Items]
Percentage of equity shares	9.80%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_BusinessAcquisitionAxis = noah_ShanghaiNoahYijieFinanceTechnologyCoLtdMember / dei_LegalEntityAxis = noah_SccVentureHoldcoLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Purchase consideration	$ 5.0us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = noah_ShanghaiNoahYijieFinanceTechnologyCoLtdMember / dei_LegalEntityAxis = noah_SccVentureHoldcoLimitedMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Convertible notes
Subsequent Event [Line Items]
Debt instrument, face amount		$ 80us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Debt instrument, interest rate		3.50%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Debt instrument, maturity period		February 2020
Debt instrument, initial conversion price		$ 23.03us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleDebtMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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Debt Instrument Maturity Month Year

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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