Document and Entity Information [Abstract] Document Information [Table] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Document Registration Statement Document Annual Report Document Period End Date Document Period End Date Document Transition Report Document Shell Company Report Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Contact Personnel Name Entity Address, Address Line One Entity Address, City or Town Entity Address, Postal Zip Code City Area Code Local Phone Number Phone Fax Number Description Entity Address, Country Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Accounting Standard Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Amendment Flag Amendment Flag Document Fiscal Period Focus Document Fiscal Period Focus ICFR Auditor Attestation Flag Consolidated Balance Sheets Statement [Table] Statement [Line Items] Statement [Line Items] Assets [Abstract] Assets Assets, Current [Abstract] Current assets Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Cash and cash equivalent Cash and cash equivalents Restricted Cash and Cash Equivalents, Current Restricted cash Restricted cash Short-term Investments Short-term investments Total short-term investments Short-term investments (including short-term investments measured at fair value of RMB642,759 and nil as of December 31, 2019 and 2020, respectively) Accounts Receivable, Net, Current Accounts receivable, net Accounts receivable, net of allowance for credit losses of nil and nil as of December 31, 2019 and 2020 Due from Related Parties, Current Amounts due from related parties, net Amounts due from related parties, net of allowance for credit losses of nil and RMB4,006 as of December 31, 2019 and 2020, respectively Notes, Loans and Financing Receivable, Net, Current Loan receivables, net of allowance for credit losses of RMB5,147 and RMB5,863 as of December 31, 2019 and 2020, respectively Loans receivable, net Loan receivables, net Other Assets, Current Other current assets Total Assets, Current Current assets Total current assets The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle), excluding investment in equity method investee and investment in and advance to affiliate. Long-term Investments, Excluding Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Long-term investments (including long-term investments measured at fair value of RMB531,359 and RMB373,678, as of December 31, 2019 and 2020, respectively) Long-term investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Total Investments in affiliates Investment in affiliates Investment in subsidiaries and VIEs Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Operating Lease, Right-of-Use Asset Operating lease right-of-use assets, net Operating lease right-of-use assets, net Deferred Income Tax Assets, Net Deferred tax assets Net deferred tax assets Non-current deferred tax assets Other Assets, Noncurrent Other non-current assets Assets Total Assets Consolidated assets Liabilities and Equity [Abstract] Liabilities and Equity Liabilities and Equity Liabilities, Current [Abstract] Current liabilities Current liabilities: (including amounts of the consolidated VIEs without recourse to Noah Holdings Ltd. See Note 2(b)) The total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued Liabilities And Employee Related Liabilities, Current Accrued payroll and welfare expenses Accrued Income Taxes, Current Income tax payable Contract with Customer, Liability, Current Deferred revenue Deferred revenues Other Liabilities, Current Other current liabilities Total The amount of contingent liabilities classified as current. Contingent Liabilities Current Contingent liabilities Liabilities, Current Current liabilities Total current liabilities Deferred Income Tax Liabilities, Net Deferred tax liabilities Operating Lease, Liability, Noncurrent Operating lease liabilities, non-current Operating lease liabilities, non-current Other Liabilities, Noncurrent Other non-current liabilities Liabilities Total Liabilities Stockholders' Equity Attributable to Parent [Abstract] Shareholders' equity Shareholders' equity: Common Stock, Value, Issued Ordinary shares Treasury Stock, Value Treasury stock (nil and 544,202 ordinary shares as of December 31, 2019 and 2020, respectively) Treasury stock (nil and 544,202 ordinary shares as of December 31, 2019 and 2020, respectively)Treasury stock (nil and 544,202 ordinary shares as of December 31, 2019 and 2020, respectively) Treasury stock, value Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Retained earnings Undistributed earning Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) Stockholders' Equity Attributable to Parent Total shareholders' equity Total Noah Holdings Limited shareholders' equity Stockholders' Equity Attributable to Noncontrolling Interest Non-controlling interests Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Balance Balance Shareholders' Equity Total Shareholders' Equity Liabilities and Equity Total Liabilities and Equity Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Class A Common Class B [Member] Class B Debt Securities, Available-for-sale, Current Available for sale investments Allowance for Doubtful Accounts Receivable, Current Balance at end of the year Balance at beginning of the year Accounts receivable, allowance for doubtful accounts Amount of allowance for credit loss on receivable from related parties. Receivable, Allowance for Credit Loss, Related Parties Amounts due from related parties, allowance for credit losses Allowance for Notes, Loans and Financing Receivable, Current Allowance for credit losses Loan receivables, allowance for loan losses Investment Owned, at Fair Value Long-term investments measured at fair value Common Stock, Par or Stated Value Per Share Ordinary shares, par value Common Stock, Shares Authorized Ordinary shares, shares authorized Common Stock, Shares, Issued Ordinary shares, shares issued Common Stock, Shares, Outstanding Ordinary shares, shares outstanding Treasury Stock, Shares Ordinary shares, treasury stock Consolidated Statements of Operations Product and Service [Axis] Products And Services [Domain] Product and Service [Domain] One Time Commissions [Member] One Time Commissions [Member] One-time commissions Recurring Service Fees [Member] Recurring Service Fees [Member] Recurring service fees Performance Based Income Performance Based Income [Member] Performance-based income Other Services [Member] Other Services [Member] Other service fees Revenues [Abstract] Revenue: Revenues: Revenue from Contract with Customer, Including Assessed Tax Revenues Total revenues Excise and Sales Taxes Less:VAT related surcharges Revenue from Contract with Customer, Excluding Assessed Tax Net revenues Net revenues Costs and Expenses [Abstract] Operating cost and expenses Operating cost and expenses: Officers Expenses. Relationship Manager Compensation Relationship manager compensation Amount of expense for salary and wage arising from service rendered by nonofficer and officer employees. Excludes allocated cost, labor-related non-salary expense, and direct and overhead labor cost included in cost of good and service sold. Performance Fee Compensation Performance-based compensation Amount of labor-related expenses classified as other. Other Compensations Other Compensation Other compensations Labor and Related Expense Total compensation and benefits Total compensation and benefits Compensation and benefits Selling Expense Selling expenses Selling expenses General and Administrative Expense General and administrative expenses General and administrative expenses Accounts Receivable, Credit Loss Expense (Reversal) Provision for credit losses (Reversal) provision for credit losses Provisions Other Expenses Other operating expenses Government Subsidies Government Subsidies Government subsidies Costs and Expenses Total operating cost and expenses Total operating cost and expenses Total operating cost and expenses Operating Income (Loss) Loss from operations Income (loss) from operations Income from operations Nonoperating Income (Expense) [Abstract] Other income (expenses): The amount of nonoperating interest income. Interest Income, Nonoperating Interest income The amount of nonoperating interest expense. Interest Expense, Nonoperating Interest expenses Interest expenses Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities. Investment income Investment income Investment income (loss) Litigation Settlement, Expense Settlement expenses Other Nonoperating Income (Expense) Other (expenses) income Other (expense) income Nonoperating Income (Expense) Total other income (expense) Total other income (expenses) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (loss) before taxes and income from equity in affiliates, subsidiaries and VIEs Income (loss) before taxes and income from equity in affiliates Income Tax Expense (Benefit) Income tax expense Income tax benefit (expenses) Total Income (Loss) from Equity Method Investments Income from equity in subsidiaries and VIEs Income from equity in affiliates Income from equity in subsidiaries and VIEs Income (loss) from equity in affiliates Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income (loss) Net income (loss) Net income (loss) Net Income (Loss) Attributable to Noncontrolling Interest Less: net (loss) income attributable to non-controlling interests Net income (loss) attributable to non-controlling interests Net Income (Loss) Attributable to Parent Net income (loss) attributable to Noah Holding Limited shareholders Net income (loss) Net income (loss) attributable to Noah Holdings Limited shareholders Net income (loss) attributable to Noah Holdings Limited shareholders Earnings Per Share, Basic [Abstract] Net income (loss) per share: Earnings Per Share, Basic Basic Basic net income (loss) per share Earnings Per Share, Diluted Diluted Diluted net income (loss) per share Weighted Average Number Basic And Diluted, Shares Outstanding [Abstract] Weighted Average Number Basic And Diluted, Shares Outstanding [Abstract] Weighted average number of shares used in computation: Weighted Average Number of Shares Outstanding, Basic Basic Weighted average number of Class A and Class B ordinary shares outstanding-basic Weighted Average Number of Shares Outstanding, Diluted Diluted Weighted average number of Class A and Class B ordinary shares outstanding-diluted Consolidated Statements of Comprehensive Income (Loss) Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Other comprehensive income (loss)-foreign currency translation adjustments Foreign currency translation adjustments Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities excluding investment held by affiliates. Other Comprehensive Income (Loss), Securities investment Excluding Investment Held by Affiliates, Available-for-sale, Adjustment, after Tax Fair value fluctuation of available-for-sale investment, net of tax of nil (Note 5) Fair value fluctuation of available-for-sale investment, net of tax of nil (Note 5) Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities held by affiliates. Other Comprehensive Income (Loss), Securities investment held by affiliates, Available-for-sale, Adjustment, after Tax Fair value fluctuation of available-for-sale investment held by affiliates, net of tax of nil Fair value fluctuation of available-for-sale investment held by affiliates, net of tax of nil Other Comprehensive Income (Loss), Net of Tax Total other comprehensive income (loss), net of tax Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests, excluding redeemable non-controlling interest of a subsidiary. Excludes changes in equity resulting from investments by owners and distributions to owners. Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Excluding Redeemable Non-controlling Interest of Subsidiary Less: comprehensive (loss) income attributable to non-controlling interests Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) attributable to Noah Holdings Limited shareholders Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Fair value fluctuation of available-for-sale investment, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Noncontrolling Interest Fair value fluctuation of available-for-sale investment held by affiliates, net of tax Consolidated Statements of Changes in Equity Shares, Outstanding Balance (in shares) Balance (in shares) Profit or loss as represented on the statement of changes in equity. Equity Profit (Loss) Net Income Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Share-based compensation Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Vesting of restricted shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised Issuance of ordinary shares upon exercise of options (in shares) Options exercised Stock Issued During Period, Value, Stock Options Exercised Issuance of ordinary shares upon exercise of options Number of shares issue during the period for settlement. Stock Issued During Period, Shares, for Settlement Restricted share units for settlement (in shares) Value of shares issued during the period for settlement. Stock Issued During Period, Value, for Settlement Restricted share units for settlement Treasury Stock, Shares, Acquired Repurchase of ordinary shares (in shares) Treasury Stock, Value, Acquired, Cost Method Repurchase of ordinary shares Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of convertible notes, Shares Stock issued during period, shares, conversion of convertible securities Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments Conversion of convertible notes, Value Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax Other comprehensive loss-change in fair value of available-for-sale investments Change in noncontrolling interests. Change in Noncontrolling Interest Non-controlling interest capital injection Increase in Noah's capital from contribution of Non controlling interests Noncontrolling Interest, Decrease from Deconsolidation Divestment of non-controlling interests Impact of acquisition related to non-controlling interest. Impact Of Acquisition Related To Noncontrolling Interest Impact of acquisition (Note 2(b)) Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Distributions to non-controlling interests The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the disposal. Noncontrolling Interest, Decrease from Disposals Disposal of a subsidiary (Note 2(b)) Number Of Transferred Shares Number Of Transferred Shares Transfer of Class B shares to Class A shares Value of transferred shares. Value Of Transferred Shares Transfer of Class B shares to Class A shares, value Treasury Stock, Shares, Retired Retirement of treasury stock, Shares Treasury Stock, Retired, Cost Method, Amount Retirement of treasury stock, Value Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Acquisition of non-controlling interests in subsidiaries Consolidated Statements of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Cash flows from operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash (used in) provided by operating activities: Adjustments to reconcile net income (loss) to net cash provided by operating activities: Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss from disposal of property and equipment Depreciation, Depletion and Amortization, Nonproduction Depreciation expense The noncash portion of lease expense charged against earnings for the period. Noncash Lease Expenses Non-cash lease expenses Share-based Compensation Share-based compensation Amount of Share-based settlement expense Share-based settlement expense Share-based settlement expense Amount of income (loss) for proportionate share of equity method investee's income (loss), net of dividends. Income (Loss) from Equity Method Investments, Net of Dividends Income from equity in affiliates, net of dividends Income from equity in affiliates, net of dividends Gain (Loss) on Disposition of Stock in Subsidiary (Gain) loss from disposal of subsidiaries Amortization of Unearned Income for Financial Lease. Amortization of Unearned Income for Financial Lease Amortization of unearned lease income Other than Temporary Impairment Losses, Investments Impairment of long-term investments Fair Value, Option, Changes in Fair Value, Gain (Loss) Changes in investment fair value in the consolidated funds Unrealized Gain (Loss) on Investments Fair value changes of equity investments measured by fair value Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Due from Related Parties, Current Amount due from related parties Amounts due from related parties Increase (Decrease) in Other Current Assets Other current assets Increase (Decrease) in Other Noncurrent Assets Other non-current assets Increase (Decrease) in Employee Related Liabilities Accrued payroll and welfare expenses Increase (Decrease) in Income Taxes Payable Income taxes payable Increase (Decrease) in Contract with Customer, Liability Deferred revenues Increase (Decrease) in Other Current Liabilities Other current liabilities Increase (Decrease) in Other Noncurrent Liabilities Other non-current liabilities Increase (Decrease) in Due to Related Parties Amounts due to related parties