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Share-Based Compensation - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 06, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of options granted	$ 27.87us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 39.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Options exercised	128,457us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	153,014us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	75,694us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Option exercise price	$ 26.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	$ 13.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Unrecognized compensation expense related to unvested share options	$ 5,452,347us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Unrecognized compensation expense, period for recognition	3 years 3 months 15 days
Restricted shares granted	83,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Converted to restricted shares	$ 37.03noah_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedWeightedAverageExercisePrice
Conversion of Options to restricted shares | After Modification
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exercise price	$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_StockOptionOtherModificationMember / us-gaap_StatementScenarioAxis = noah_AfterModificationMember
Conversion of Options to restricted shares | Before Modification
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exercise price	$ 9.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_StockOptionOtherModificationMember / us-gaap_StatementScenarioAxis = noah_BeforeModificationMember
Stock Options | Modification of Exercise Price | After Modification
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exercise price	$ 12.12us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = noah_AfterModificationMember
Stock Options | Modification of Exercise Price | After Modification | American Depositary Share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exercise price	$ 6.06us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementClassOfStockAxis = noah_AmericanDepositaryShareMember / us-gaap_StatementScenarioAxis = noah_AfterModificationMember
Stock Options | Modification of Exercise Price | Before Modification
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exercise price	$ 19.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = noah_BeforeModificationMember
Nonvested Stock Option | Modification of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost related to plan modified	700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = noah_NonvestedStockOptionMember
Vested Stock Options | Modification of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost related to plan modified	200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = noah_VestedStockOptionsMember
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, period for recognition	1 year 11 months 9 days
Total fair value of non-vested restricted shares	3,543,512us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	2,702,791us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	2,144,851us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Unrecognized compensation expense related to non-vested restricted shares	4,526,236us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock | Modification of Exercise Price
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost related to plan modified	200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember			300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Unrecognized compensation expense, period for recognition	2 years			2 years
Restricted shares granted	150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock | Modification of Exercise Price | Independent Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares granted				19,375us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_TitleOfIndividualAxis = noah_IndependentDirectorsMember
Restricted Stock | Modification of Exercise Price | After Modification
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exercise price	$ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementScenarioAxis = noah_AfterModificationMember
Converted to restricted shares				$ 0noah_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementScenarioAxis = noah_AfterModificationMember
Restricted Stock | Modification of Exercise Price | Before Modification
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option exercise price	$ 5.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementScenarioAxis = noah_BeforeModificationMember
Converted to restricted shares				$ 37.03noah_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementScenarioAxis = noah_BeforeModificationMember
Restricted Stock | Conversion of Options to restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental compensation cost related to plan modified	$ 2,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / noah_AmendmentAxis = noah_StockOptionOtherModificationMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Stock Incentive Plan 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares that may be issued as a percentage of outstanding stock	8.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum / us-gaap_PlanNameAxis = noah_StockIncentivePlanTwentyZeroEightMember
Stock Incentive Plan 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares that may be issued as a percentage of outstanding stock	10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum / us-gaap_PlanNameAxis = noah_StockIncentivePlanTwentyTenMember
Maximum number of shares that may be issued	2,315,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = noah_StockIncentivePlanTwentyTenMember
Stock Incentive Plan 2010 | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plans, term	10 years
Vesting period for remaining the 75% of options granted	36 months
Stock Incentive Plan 2010 | Stock Options | First anniversary of the grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive vesting ratably over the following 36 months	25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = noah_StockIncentivePlanTwentyTenMember / us-gaap_VestingAxis = noah_FirstAnniversaryOfGrantDateMember
Stock Incentive Plan 2010 | Stock Options | Vesting ratably over the following 36 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive vesting ratably over the following 36 months	75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = noah_StockIncentivePlanTwentyTenMember / us-gaap_VestingAxis = noah_OverThreeYearsMember

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Share Based Compensation Arrangement By Share Based Payment Award Award Term

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Number of share options (or share units) exercised during the current period.

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