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Amounts in Noah Investment and its Subsidiaries Included in Consolidated Financial Statements (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Variable Interest Entity [Line Items]        
Cash and cash equivalents $ 282,081,829us-gaap_CashAndCashEquivalentsAtCarryingValue $ 196,113,315us-gaap_CashAndCashEquivalentsAtCarryingValue $ 119,561,152us-gaap_CashAndCashEquivalentsAtCarryingValue $ 136,859,336us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 161,171us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 165,188us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue    
Short-term investments 22,182,012us-gaap_ShortTermInvestments 28,187,406us-gaap_ShortTermInvestments    
Accounts receivable, net of allowance for doubtful accounts 10,970,775us-gaap_AccountsReceivableNetCurrent 8,472,013us-gaap_AccountsReceivableNetCurrent    
Amounts due from related parties 31,085,548us-gaap_DueFromRelatedPartiesCurrent 8,924,824us-gaap_DueFromRelatedPartiesCurrent    
Deferred tax assets 3,522,054us-gaap_DeferredTaxAssetsNetCurrent 784,063us-gaap_DeferredTaxAssetsNetCurrent    
Other current assets 9,430,135us-gaap_OtherAssetsCurrent 4,695,947us-gaap_OtherAssetsCurrent    
Long-term investments 9,870,939us-gaap_LongTermInvestments 13,678,182us-gaap_LongTermInvestments    
Investment in affiliates 35,817,261us-gaap_EquityMethodInvestments 14,742,364us-gaap_EquityMethodInvestments    
Property and equipment, net 14,852,566us-gaap_PropertyPlantAndEquipmentNet 9,412,313us-gaap_PropertyPlantAndEquipmentNet    
Other non-current assets 1,930,814us-gaap_OtherAssetsNoncurrent 1,220,033us-gaap_OtherAssetsNoncurrent    
Total assets 431,100,062us-gaap_Assets 303,254,657us-gaap_Assets    
Accrued payroll and welfare expenses 51,649,188noah_AccruedLiabilitiesAndEmployeeRelatedLiabilitiesCurrent 29,495,181noah_AccruedLiabilitiesAndEmployeeRelatedLiabilitiesCurrent    
Income tax payable 8,936,390us-gaap_AccruedIncomeTaxesCurrent 2,559,614us-gaap_AccruedIncomeTaxesCurrent    
Deferred revenue 15,747,984us-gaap_DeferredRevenueCurrent 15,530,968us-gaap_DeferredRevenueCurrent    
Other current liabilities 27,259,639us-gaap_OtherLiabilitiesCurrent 15,227,247us-gaap_OtherLiabilitiesCurrent    
Non-current uncertain tax position liabilities 1,793,459us-gaap_LiabilityForUncertainTaxPositionsNoncurrent 1,650,399us-gaap_LiabilityForUncertainTaxPositionsNoncurrent    
Total liabilities 118,449,478us-gaap_Liabilities 68,059,704us-gaap_Liabilities    
Revenue:        
Third-party revenues 129,454,969us-gaap_Revenues 95,989,067us-gaap_Revenues 65,780,848us-gaap_Revenues  
Related party revenues 132,793,592us-gaap_RevenueFromRelatedParties 77,329,868us-gaap_RevenueFromRelatedParties 25,982,724us-gaap_RevenueFromRelatedParties  
Total revenues 262,248,561noah_GrossRevenue 173,318,935noah_GrossRevenue 91,763,572noah_GrossRevenue  
Less: business taxes and related surcharges (14,380,469)noah_BusinessTaxAndSurcharges (9,547,102)noah_BusinessTaxAndSurcharges (5,068,066)noah_BusinessTaxAndSurcharges  
Net revenues 247,868,092us-gaap_SalesRevenueNet 163,771,833us-gaap_SalesRevenueNet 86,695,506us-gaap_SalesRevenueNet  
Other income 7,863,620us-gaap_NonoperatingIncomeExpense 7,539,142us-gaap_NonoperatingIncomeExpense 5,426,421us-gaap_NonoperatingIncomeExpense  
Net income 72,406,504us-gaap_NetIncomeLoss 51,435,171us-gaap_NetIncomeLoss 22,826,454us-gaap_NetIncomeLoss  
Cash flows provided by operating activities 95,135,759us-gaap_NetCashProvidedByUsedInOperatingActivities 93,969,758us-gaap_NetCashProvidedByUsedInOperatingActivities 29,953,666us-gaap_NetCashProvidedByUsedInOperatingActivities  
Cash flows used in investing activities (14,798,221)us-gaap_NetCashProvidedByUsedInInvestingActivities (17,141,870)us-gaap_NetCashProvidedByUsedInInvestingActivities (34,565,150)us-gaap_NetCashProvidedByUsedInInvestingActivities  
Cash flows provided by financing activities 9,729,099us-gaap_NetCashProvidedByUsedInFinancingActivities (3,103,229)us-gaap_NetCashProvidedByUsedInFinancingActivities (13,791,999)us-gaap_NetCashProvidedByUsedInFinancingActivities  
One Time Commissions        
Revenue:        
Third-party revenues 68,698,354us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
57,972,609us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
39,486,943us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
 
Related party revenues 29,322,581us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
20,841,594us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
9,392,131us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
 
Recurring Service Fees        
Revenue:        
Third-party revenues 51,892,138us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
32,951,345us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
25,321,982us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
 
Related party revenues 90,885,669us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
55,508,435us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
16,590,593us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
 
Other Service        
Revenue:        
Third-party revenues 8,864,477us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
5,065,113us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
971,923us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
 
Related party revenues 12,585,342us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
979,839us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
   
Variable Interest Entity, Primary Beneficiary        
Variable Interest Entity [Line Items]        
Cash and cash equivalents 76,252,171us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
45,443,856us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Restricted cash 161,171us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
165,188us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Short-term investments 6,248,761us-gaap_ShortTermInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
13,872,921us-gaap_ShortTermInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Accounts receivable, net of allowance for doubtful accounts 3,775,420us-gaap_AccountsReceivableNetCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
1,784,726us-gaap_AccountsReceivableNetCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Amounts due from related parties 12,988,022us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
3,532,343us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Deferred tax assets 1,841,876us-gaap_DeferredTaxAssetsNetCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
604,377us-gaap_DeferredTaxAssetsNetCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Other current assets 1,438,158us-gaap_OtherAssetsCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
1,195,057us-gaap_OtherAssetsCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Long-term investments 483,512us-gaap_LongTermInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
6,302,362us-gaap_LongTermInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Investment in affiliates 39,662,915us-gaap_EquityMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
18,893,396us-gaap_EquityMethodInvestments
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Property and equipment, net 3,627,715us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
1,109,738us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Other non-current assets 182,262us-gaap_OtherAssetsNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
299,378us-gaap_OtherAssetsNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Total assets 146,661,983us-gaap_Assets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
93,203,342us-gaap_Assets
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Accrued payroll and welfare expenses 11,059,108noah_AccruedLiabilitiesAndEmployeeRelatedLiabilitiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
3,078,297noah_AccruedLiabilitiesAndEmployeeRelatedLiabilitiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Income tax payable 4,518,462us-gaap_AccruedIncomeTaxesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
2,167,268us-gaap_AccruedIncomeTaxesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Amounts due to the Group's subsidiaries 27,289,801us-gaap_DueToAffiliateCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
34,660,524us-gaap_DueToAffiliateCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Deferred revenue 6,105,780us-gaap_DeferredRevenueCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
8,377,979us-gaap_DeferredRevenueCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Other current liabilities 4,475,798us-gaap_OtherLiabilitiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
961,140us-gaap_OtherLiabilitiesCurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Non-current uncertain tax position liabilities 1,019,175us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
1,044,580us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Total liabilities 54,468,124us-gaap_Liabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
50,289,788us-gaap_Liabilities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Revenue:        
Third-party revenues 35,188,916us-gaap_Revenues
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
11,731,295us-gaap_Revenues
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
2,190,467us-gaap_Revenues
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Related party revenues 62,130,226us-gaap_RevenueFromRelatedParties
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
24,978,882us-gaap_RevenueFromRelatedParties
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
5,459,969us-gaap_RevenueFromRelatedParties
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Total revenues 97,319,142noah_GrossRevenue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
36,710,177noah_GrossRevenue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
7,650,436noah_GrossRevenue
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Less: business taxes and related surcharges (5,457,850)noah_BusinessTaxAndSurcharges
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
(2,043,086)noah_BusinessTaxAndSurcharges
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
(416,525)noah_BusinessTaxAndSurcharges
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Net revenues 91,861,292us-gaap_SalesRevenueNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
34,667,091us-gaap_SalesRevenueNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
7,233,911us-gaap_SalesRevenueNet
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Operating cost and expenses (29,655,461)us-gaap_OperatingCostsAndExpenses
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
(13,836,442)us-gaap_OperatingCostsAndExpenses
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
(6,409,491)us-gaap_OperatingCostsAndExpenses
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Other income 1,930,322us-gaap_NonoperatingIncomeExpense
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
2,503,612us-gaap_NonoperatingIncomeExpense
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
200,319us-gaap_NonoperatingIncomeExpense
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Net income 50,387,400us-gaap_NetIncomeLoss
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
19,250,180us-gaap_NetIncomeLoss
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
1,168,218us-gaap_NetIncomeLoss
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Cash flows provided by operating activities 39,849,513us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[2] 40,988,172us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[2] 29,624,846us-gaap_NetCashProvidedByUsedInOperatingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1],[2]  
Cash flows used in investing activities (8,659,151)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
(15,809,672)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
(21,368,983)us-gaap_NetCashProvidedByUsedInInvestingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Cash flows provided by financing activities 220,017us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
6,265,618us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
2,178,103us-gaap_NetCashProvidedByUsedInFinancingActivities
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Variable Interest Entity, Primary Beneficiary | One Time Commissions        
Revenue:        
Third-party revenues 13,072,826us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
1,171,253us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
31,859us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Related party revenues 3,485,958us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
465,360us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
331,712us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OneTimeCommissionsMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Variable Interest Entity, Primary Beneficiary | Recurring Service Fees        
Revenue:        
Third-party revenues 18,163,030us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
6,070,762us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
1,200,863us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Related party revenues 46,376,791us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
23,597,359us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
5,128,257us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_RecurringServiceFeesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Variable Interest Entity, Primary Beneficiary | Other Service        
Revenue:        
Third-party revenues 3,953,060us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
4,489,280us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
957,745us-gaap_Revenues
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
Related party revenues 12,267,477us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
916,163us-gaap_RevenueFromRelatedParties
/ us-gaap_IncomeStatementLocationAxis
= noah_OtherServicesMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
   
Variable Interest Entity, Primary Beneficiary | Noah Holdings Limited        
Revenue:        
Net income $ 47,379,799us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= noah_NoahHoldingsLimitedMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
$ 17,644,412us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= noah_NoahHoldingsLimitedMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
$ 1,086,355us-gaap_NetIncomeLoss
/ dei_LegalEntityAxis
= noah_NoahHoldingsLimitedMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
[1]  
[1] Tianjin Gopher's result of operations and cash flows are included in the presentation starting from March 2012.
[2] Cash flows provided by operating activities in 2013 and 2014 include amounts due to the Group's subsidiaries of $34,660,524 and $27,289,801.