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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 | $ 3,600,000 us-gaap_OperatingLossCarryforwards |  |
Operating loss carry forwards expiration year | 2017 |  |
Operating loss carry forward, valuation allowance | 0 us-gaap_OperatingLossCarryforwardsValuationAllowance |  |
Undistributed profits that the Group has both the intent and ability to permanently reinvest | 190,700,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Unrecognized deferred tax liabilities | 16,000,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries |  |
Unrecognized tax benefit, accrued interest in current period | 774,284 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 605,820 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |
Reversal of unrecognized tax benefits previously recorded, statute of limitations |  |  | 322,378 us-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 | $ 168,464 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = noah_InterestRelatedToUncertainTaxPositionsMember | $ 168,926 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = noah_InterestRelatedToUncertainTaxPositionsMember | $ 169,389 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued / us-gaap_IncomeTaxAuthorityAxis = noah_InterestRelatedToUncertainTaxPositionsMember

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- Definition Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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