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Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Income tax rate	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Operating loss carry forward	$ 3,600,000us-gaap_OperatingLossCarryforwards
Operating loss carry forwards expiration year	2017
Operating loss carry forward, valuation allowance	0us-gaap_OperatingLossCarryforwardsValuationAllowance
Undistributed profits that the Group has both the intent and ability to permanently reinvest	190,700,000us-gaap_UndistributedEarningsOfForeignSubsidiaries
Unrecognized deferred tax liabilities	16,000,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries
Unrecognized tax benefit, accrued interest in current period	774,284us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	605,820us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
Reversal of unrecognized tax benefits previously recorded, statute of limitations			322,378us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Minimum
Income Taxes [Line Items]
Withholding income tax rate	5.00%noah_DividendWithholdingTaxRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Income Taxes [Line Items]
Withholding income tax rate	10.00%noah_DividendWithholdingTaxRate / us-gaap_RangeAxis = us-gaap_MaximumMember
If the underpayment of taxes is due to computational errors made by the taxpayer or withholding agent
Income Taxes [Line Items]
Unrecognized tax benefit, statute of limitations	3 years
If underpayment of tax liability exceeding RMB0.1 million
Income Taxes [Line Items]
Unrecognized tax benefit, statute of limitations	5 years
In the case of a related party transaction
Income Taxes [Line Items]
Unrecognized tax benefit, statute of limitations	10 years
State Administration of Taxation, People's Republic of China
Income Taxes [Line Items]
Income tax rate	25.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_StateAdministrationOfTaxationChinaMember
Inland Revenue, Hong Kong
Income Taxes [Line Items]
Income tax rate	16.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations / us-gaap_IncomeTaxAuthorityNameAxis = us-gaap_InlandRevenueHongKongMember
Interest Related To Uncertain Tax Positions
Income Taxes [Line Items]
Unrecognized tax benefit, accrued interest in current period	$ 168,464us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = noah_InterestRelatedToUncertainTaxPositionsMember	$ 168,926us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = noah_InterestRelatedToUncertainTaxPositionsMember	$ 169,389us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = noah_InterestRelatedToUncertainTaxPositionsMember

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Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries.

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