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Income Taxes - Movements of Valuation Allowance of Deferred Tax Assets (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Movements of valuation allowance of deferred tax assets |  |  |  |
Balance at beginning of the year | ¥ 60,628 |  | ¥ 56,653 |
Provided | 20,275 |  | 24,196 | ¥ 56,653
Addition due to acquisition | 193,826 |  |  |
Write off | (2,916) |  | (20,221) | (15,651)
Balance at end of the year | ¥ 271,813 | $ 42,653 | ¥ 60,628 | ¥ 56,653

X
- Definition Amount of deferred tax assets due to asset acquisition for which it is more likely than not that a tax benefit will not be realized. + References No definition available. + Details
Name: | noah_DeferredTaxAssetsValuationAllowanceAdditionDueToAssetAcquisition
Namespace Prefix: | noah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | noah_DeferredTaxAssetsValuationAllowanceRollForward
Namespace Prefix: | noah_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents amount of addition in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | noah_ValuationAllowanceDeferredTaxAssetAdditionsAmount
Namespace Prefix: | noah_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition It represents amount of write off in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | noah_ValuationAllowanceDeferredTaxAssetWriteOffAmount
Namespace Prefix: | noah_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant