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Loans Receivable, Net - Additional Information (Detail) | Dec. 31, 2014
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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: |