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Related Party Transactions - Additional Information (Details) - CNY (¥) ¥ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related Party Transactions
Donations	¥ 1.2	¥ 1.2	¥ 2.7

X

- Definition

Donation Payments Made During Period

+ References

No definition available.

+ Details

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Namespace Prefix:	noah_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration