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Fair Value Measurement - Additional Information (Details) ¥ in Millions	12 Months Ended
	Dec. 31, 2019 CNY (¥) item	Dec. 31, 2018 CNY (¥) item
Fair Value Measurement
Number of consolidated investment funds | item	2	2
Equity investments without readily determinable fair value | ¥	¥ 312,916	¥ 279,349

X

- Definition

Consolidated Investment Funds

+ References

No definition available.

+ Details

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Namespace Prefix:	noah_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

+ Details

Name:	us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration