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Purchase Price Allocations (Detail) (Shanghai Yafu Investment Consulting Co., Ltd.) | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2014 Noah Ark (Shanghai) Financial Service Co., Ltd. USD ($) | Dec. 31, 2014 Noah Ark (Shanghai) Financial Service Co., Ltd. CNY | Dec. 31, 2014 Shanghai Noah Yijie Finance Technology Co., Ltd. USD ($) | Dec. 31, 2014 Shanghai Noah Yijie Finance Technology Co., Ltd. CNY | Dec. 31, 2014 Shanghai Noah Jintong Data Services Co., Ltd. USD ($) | Dec. 31, 2014 Shanghai Noah Jintong Data Services Co., Ltd. CNY | Dec. 31, 2014 Enoch Education Training Shanghai Co., Ltd. USD ($) | Dec. 31, 2014 Enoch Education Training Shanghai Co., Ltd. CNY
Business Combination Allocation of Purchase Price [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price | $ 1,934,049 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | 12,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | $ 805,854 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = noah_NoahArkShanghaiFinancialServiceCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | 5,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = noah_NoahArkShanghaiFinancialServiceCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | $ 483,512 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = noah_ShanghaiNoahYijieFinanceTechnologyCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | 3,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = noah_ShanghaiNoahYijieFinanceTechnologyCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | $ 483,512 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = noah_ShanghaiNoahJintongDataServicesCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | 3,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = noah_ShanghaiNoahJintongDataServicesCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | $ 161,171 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = noah_EnochEducationTrainingShanghaiCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember | 1,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = noah_EnochEducationTrainingShanghaiCoLtdMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = noah_ShanghaiYafuInvestmentConsultingCompanyMember

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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