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

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- Definition The increase (decrease) in current obligations (due within one year or one operating cycle) owed to an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration