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Amounts in Noah Investment and its Subsidiaries Included in Consolidated Financial Statements (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]    
Increase in amounts due to the Group's subsidiaries $ 27,289,801us-gaap_IncreaseDecreaseInDueToAffiliatesCurrent $ 34,660,524us-gaap_IncreaseDecreaseInDueToAffiliatesCurrent