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Loans Receivable (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Loans receivable:    
Total loans receivable $ 7,120,523us-gaap_NotesAndLoansReceivableGrossCurrent $ 15,519,434us-gaap_NotesAndLoansReceivableGrossCurrent
Allowance for loan losses (188,054)us-gaap_AllowanceForNotesAndLoansReceivableCurrent (155,194)us-gaap_AllowanceForNotesAndLoansReceivableCurrent
Loans receivable, net 6,932,469us-gaap_NotesAndLoansReceivableNetCurrent 15,364,240us-gaap_NotesAndLoansReceivableNetCurrent
Within Credit Term Loans    
Loans receivable:    
Total loans receivable $ 7,120,523us-gaap_NotesAndLoansReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= noah_WithinCreditTermLoansMember
$ 15,519,434us-gaap_NotesAndLoansReceivableGrossCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByBillingStatusTypeAxis
= noah_WithinCreditTermLoansMember