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Summary of Principal Accounting Policies - Additional Information (Detail)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2014
CNY
Dec. 31, 2014
Special Mention
Dec. 31, 2014
Substandard
Dec. 31, 2014
Doubtful
Dec. 31, 2014
Loss
May 31, 2011
Kunshan Jingzhao Equity Investment Management Co., Ltd.
USD ($)
May 31, 2011
Kunshan Jingzhao Equity Investment Management Co., Ltd.
CNY
Nov. 30, 2012
Kunshan Vantone Zhengyuan Private Equity Fund Management Co., Ltd
USD ($)
Nov. 30, 2012
Kunshan Vantone Zhengyuan Private Equity Fund Management Co., Ltd
CNY
Feb. 28, 2013
Wanjia Win-Win Assets Management Co., Ltd.
USD ($)
Feb. 28, 2013
Wanjia Win-Win Assets Management Co., Ltd.
CNY
Jul. 31, 2013
Wuhu Bona Film Investment Management Limited
USD ($)
Jul. 31, 2013
Wuhu Bona Film Investment Management Limited
CNY
Dec. 31, 2014
Short-term Loans
Dec. 31, 2014
Internet Finance Business
Dec. 31, 2014
Fund Managers
Dec. 31, 2014
Other Businesses
Dec. 31, 2012
Tianjin Gefei Asset Management Co., Ltd
Investment
Dec. 31, 2011
Tianjin Gefei Asset Management Co., Ltd
Investment
Dec. 31, 2010
Tianjin Gefei Asset Management Co., Ltd
Investment
Dec. 31, 2014
Gopher Asset Management Co., Ltd.
fund
Investment
Dec. 31, 2013
Gopher Asset Management Co., Ltd.
Investment
fund
Dec. 31, 2012
Gopher Asset Management Co., Ltd.
Investment
Dec. 31, 2014
Newly Established
Gopher Asset Management Co., Ltd.
Investment
fund
Dec. 31, 2013
Newly Established
Gopher Asset Management Co., Ltd.
Investment
fund
Dec. 31, 2012
Newly Established
Gopher Asset Management Co., Ltd.
Investment
Dec. 31, 2014
Variable Interest Entity, Primary Beneficiary
USD ($)
Dec. 31, 2013
Variable Interest Entity, Primary Beneficiary
USD ($)
Dec. 31, 2014
Variable Interest Entity, Primary Beneficiary
Credit Concentration Risk
Net Revenue
Dec. 31, 2013
Variable Interest Entity, Primary Beneficiary
Credit Concentration Risk
Net Revenue
Dec. 31, 2012
Variable Interest Entity, Primary Beneficiary
Credit Concentration Risk
Net Revenue
Dec. 31, 2014
Variable Interest Entity, Primary Beneficiary
Credit Concentration Risk
Net Income (Loss)
Dec. 31, 2013
Variable Interest Entity, Primary Beneficiary
Credit Concentration Risk
Net Income (Loss)
Dec. 31, 2012
Variable Interest Entity, Primary Beneficiary
Credit Concentration Risk
Net Income (Loss)
Dec. 31, 2014
Variable Interest Entity, Primary Beneficiary
Credit Concentration Risk
Total Assets
Dec. 31, 2013
Variable Interest Entity, Primary Beneficiary
Credit Concentration Risk
Total Assets
Dec. 31, 2014
Minimum
Dec. 31, 2012
Minimum
Tianjin Gefei Asset Management Co., Ltd
Dec. 31, 2014
Minimum
CHINA
Dec. 31, 2014
Maximum
Dec. 31, 2012
Maximum
Tianjin Gefei Asset Management Co., Ltd
Dec. 31, 2014
Maximum
Gopher Asset Management Co., Ltd.
Real Estate Funds
Dec. 31, 2013
Maximum
Gopher Asset Management Co., Ltd.
Real Estate Funds
Dec. 31, 2014
Maximum
Gopher Asset Management Co., Ltd.
Private Equity Funds Products
Dec. 31, 2013
Maximum
Gopher Asset Management Co., Ltd.
Private Equity Funds Products
Dec. 31, 2014
Maximum
CHINA
Significant Accounting Policies [Line Items]                                                                                                  
Interest-free loans extended to VIE founders $ 3,600,000us-gaap_LoansAndLeasesReceivableRelatedParties     27,000,000us-gaap_LoansAndLeasesReceivableRelatedParties                                                                                          
Interest-free loans agreements expiry date 2023-12                                                                                                
Concentration risk, percentage                                                               37.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 21.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 8.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 67.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= noah_NetIncomeLossMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 36.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= noah_NetIncomeLossMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 5.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= noah_NetIncomeLossMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 34.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AssetsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 30.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AssetsTotalMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		                    
Ownership percentage in affiliate to represent influence                                                                               20.00%noah_OwnershipInterestInVotingRightsOfInvesteeRequiredForSignificantInfluenceMinimum
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                  
Number of private equity funds the company invested                                         1noah_NumberOfPrivateEquityFundInvested
/ dei_LegalEntityAxis
= noah_TianjinGefeiAssetManagementCompanyLimitedMember		 6noah_NumberOfPrivateEquityFundInvested
/ dei_LegalEntityAxis
= noah_TianjinGefeiAssetManagementCompanyLimitedMember		 4noah_NumberOfPrivateEquityFundInvested
/ dei_LegalEntityAxis
= noah_TianjinGefeiAssetManagementCompanyLimitedMember		 16noah_NumberOfPrivateEquityFundInvested
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 3noah_NumberOfPrivateEquityFundInvested
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 2noah_NumberOfPrivateEquityFundInvested
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		                                              
Equity Interest ownership                 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_KunshanJingzhaoEquityInvestmentManagementLimitedMember		 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_KunshanJingzhaoEquityInvestmentManagementLimitedMember		 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_KunshanVantoneZhengyuanPrivateEquityFundManagementLimitedMember		 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_KunshanVantoneZhengyuanPrivateEquityFundManagementLimitedMember		 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_WanjiaWinwinInvestmentManagementLimitedMember		 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_WanjiaWinwinInvestmentManagementLimitedMember		 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_WuhuBonaFilmAndTelevisionCciCapitalLtdMember		 15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_WuhuBonaFilmAndTelevisionCciCapitalLtdMember		               100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		                                 0.60%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= noah_TianjinGefeiAssetManagementCompanyLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		     4.80%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= noah_TianjinGefeiAssetManagementCompanyLimitedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 1.70%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 2.30%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= us-gaap_RealEstateFundsMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 5.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_InvestmentTypeAxis
= us-gaap_PrivateEquityFundsMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Number of real estate funds the company invested                                               14us-gaap_NumberOfRealEstateProperties
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 75us-gaap_NumberOfRealEstateProperties
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 38us-gaap_NumberOfRealEstateProperties
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 14us-gaap_NumberOfRealEstateProperties
/ noah_InvestmentFundStructuresAxis
= noah_NewlyEstablishedMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 75us-gaap_NumberOfRealEstateProperties
/ noah_InvestmentFundStructuresAxis
= noah_NewlyEstablishedMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 38us-gaap_NumberOfRealEstateProperties
/ noah_InvestmentFundStructuresAxis
= noah_NewlyEstablishedMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		                                        
Number of secondary market equity funds the company invested                                               15noah_NumberOfSecondaryMarketEquityFunds
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 2noah_NumberOfSecondaryMarketEquityFunds
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		                                                
Number of fixed income funds the company invested                                                     12noah_NumberOfFixedIncomeFunds
/ noah_InvestmentFundStructuresAxis
= noah_NewlyEstablishedMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		 8noah_NumberOfFixedIncomeFunds
/ noah_InvestmentFundStructuresAxis
= noah_NewlyEstablishedMember
/ dei_LegalEntityAxis
= noah_GopherAssetManagementCoLtdMember		                                          
Capital Injected in to a joint venture                 600,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_KunshanJingzhaoEquityInvestmentManagementLimitedMember		 4,000,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_KunshanJingzhaoEquityInvestmentManagementLimitedMember		 600,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_KunshanVantoneZhengyuanPrivateEquityFundManagementLimitedMember		 3,800,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_KunshanVantoneZhengyuanPrivateEquityFundManagementLimitedMember		 3,500,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_WanjiaWinwinInvestmentManagementLimitedMember		 21,000,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_WanjiaWinwinInvestmentManagementLimitedMember		 100,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_WuhuBonaFilmAndTelevisionCciCapitalLtdMember		 800,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= noah_WuhuBonaFilmAndTelevisionCciCapitalLtdMember		                                                                  
Income (loss) from equity in affiliates 2,200,504us-gaap_IncomeLossFromEquityMethodInvestments 1,191,833us-gaap_IncomeLossFromEquityMethodInvestments 617,361us-gaap_IncomeLossFromEquityMethodInvestments                                                                                            
Investments in affiliates 35,817,261us-gaap_EquityMethodInvestments 14,742,364us-gaap_EquityMethodInvestments                                                       39,662,915us-gaap_EquityMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		 18,893,396us-gaap_EquityMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember		                                    
Capitalized software development costs, amortization period                                                                               2 years     4 years            
Non-controlling interests 14,028,321us-gaap_MinorityInterest 10,769,789us-gaap_MinorityInterest                                                                                              
Net income attributable to non-controlling interests 2,806,078us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 1,602,867us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 82,712us-gaap_NetIncomeLossAttributableToNoncontrollingInterest                                                                                            
Multiple element arrangements, revenue allocation If the estimated selling price for recurring services increased (or decreased) by 1%, the revenue allocated to this revenue element would increase (decrease) by 0.1% to 0.7%.                                                                                                
Other service fees as percentage of total net revenue                                 0.63%noah_ServiceFeesAsPercentageOfTotalAnnualRevenue
/ us-gaap_InvestmentTypeAxis
= noah_ShortTermLoansMember		 0.48%noah_ServiceFeesAsPercentageOfTotalAnnualRevenue
/ us-gaap_InvestmentTypeAxis
= noah_InternetFinanceBusinessMember		 6.20%noah_ServiceFeesAsPercentageOfTotalAnnualRevenue
/ us-gaap_InvestmentTypeAxis
= noah_FundManagersMember		 0.87%noah_ServiceFeesAsPercentageOfTotalAnnualRevenue
/ us-gaap_InvestmentTypeAxis
= noah_OtherBusinessesMember		                                                          
Business tax and related surcharges                                                                                   5.35%noah_BusinessTaxAndSurchargesRate
/ us-gaap_IncomeTaxAuthorityAxis
= country_CN
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		             5.70%noah_BusinessTaxAndSurchargesRate
/ us-gaap_IncomeTaxAuthorityAxis
= country_CN
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Government subsidies $ 14,792,142noah_GovernmentSubsidies $ 5,323,670noah_GovernmentSubsidies $ 4,295,029noah_GovernmentSubsidies                                                                                            
General reserve percentage of total loan receivable balance                                                                               1.00%noah_PercentageOfGeneralReserve
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		                  
Loan loss provision rate         2.00%noah_AllowanceForLoanLossesPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 25.00%noah_AllowanceForLoanLossesPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 50.00%noah_AllowanceForLoanLossesPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 100.00%noah_AllowanceForLoanLossesPercentage
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_UnlikelyToBeCollectedFinancingReceivableMember