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Share-Based Compensation - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended
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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 | $ 27.87 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 39.64 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |  |
Options exercised | 128,457 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 153,014 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 75,694 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |
Option exercise price | $ 26.21 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 13.23 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |
Unrecognized compensation expense related to unvested share options | $ 5,452,347 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions |  |  |
Unrecognized compensation expense, period for recognition | 3 years 3 months 15 days |  |  |
Restricted shares granted | 83,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod |  |  |
Converted to restricted shares | $ 37.03 noah_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsConvertedWeightedAverageExercisePrice |  |  |
Conversion of Options to restricted shares | After Modification |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Option exercise price | $ 0 us-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 | $ 9.52 us-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 | $ 12.12 us-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 | $ 6.06 us-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 | $ 19.81 us-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 | 700,000 us-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 | 200,000 us-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 | 3,543,512 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 2,702,791 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 2,144,851 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Unrecognized compensation expense related to non-vested restricted shares | 4,526,236 us-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 | 200,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  | 300,000 us-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 | 150,000 us-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 |  |  |  | 19,375 us-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 | $ 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementScenarioAxis = noah_AfterModificationMember |  |  |
Converted to restricted shares |  |  |  | $ 0 noah_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 | $ 5.58 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / noah_AmendmentAxis = noah_ModificationOfExercisePriceMember / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementScenarioAxis = noah_BeforeModificationMember |  |  |
Converted to restricted shares |  |  |  | $ 37.03 noah_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 | $ 2,200,000 us-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 | 2,315,000 us-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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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Converted Weighted Average Exercise Price + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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