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Loans Receivable, Net - Additional Information (Detail)	Dec. 31, 2014
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan interest rate	8.00%noah_LoansReceivableInterestRate / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan interest rate	15.20%noah_LoansReceivableInterestRate / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Loans Receivable Interest Rate

+ References

No definition available.

+ Details

Name:	noah_LoansReceivableInterestRate
Namespace Prefix:	noah_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: