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v2.4.1.9

Investment (Detail) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Short-term investments |  |
Trading securities investments |  | $ 11,341,097 us-gaap_TradingSecurities
Held-to-maturity investments | 7,435,461 us-gaap_HeldToMaturitySecuritiesCurrent | 16,846,309 us-gaap_HeldToMaturitySecuritiesCurrent
Available for sale investments | 14,746,551 us-gaap_AvailableForSaleSecuritiesCurrent |
Total short-term investments | 22,182,012 us-gaap_ShortTermInvestments | 28,187,406 us-gaap_ShortTermInvestments
Long-term investments |  |
Held-to-maturity investments | 5,157,464 us-gaap_HeldToMaturitySecuritiesNoncurrent | 10,480,964 us-gaap_HeldToMaturitySecuritiesNoncurrent
Other long-term investments | 4,713,475 us-gaap_OtherLongTermInvestments | 3,197,218 us-gaap_OtherLongTermInvestments
Total long-term investments | 9,870,939 us-gaap_LongTermInvestments | 13,678,182 us-gaap_LongTermInvestments
Total investments | 32,052,951 us-gaap_Investments | 41,865,588 us-gaap_Investments
Fixed Income Products |  |
Short-term investments |  |
Trading securities investments |  | 11,341,097 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeSecuritiesMember
Held-to-maturity investments | 7,435,461 us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeSecuritiesMember | 16,846,309 us-gaap_HeldToMaturitySecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeSecuritiesMember
Available for sale investments | 14,357,845 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeSecuritiesMember |
Long-term investments |  |
Held-to-maturity investments | 483,512 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeSecuritiesMember | 10,480,964 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = us-gaap_FixedIncomeSecuritiesMember
Other Products |  |
Short-term investments |  |
Available for sale investments | 388,706 us-gaap_AvailableForSaleSecuritiesCurrent / us-gaap_InvestmentTypeAxis = noah_OtherSecuritiesMember |
Long-term investments |  |
Held-to-maturity investments | 4,673,952 us-gaap_HeldToMaturitySecuritiesNoncurrent / us-gaap_InvestmentTypeAxis = noah_OtherSecuritiesMember |
Other long-term investments | 2,224,999 us-gaap_OtherLongTermInvestments / us-gaap_InvestmentTypeAxis = noah_OtherSecuritiesMember |
Private Equity Funds Products |  |
Long-term investments |  |
Other long-term investments | $ 2,488,476 us-gaap_OtherLongTermInvestments / us-gaap_InvestmentTypeAxis = noah_PrivateEquitySecuritiesMember | $ 3,197,218 us-gaap_OtherLongTermInvestments / us-gaap_InvestmentTypeAxis = noah_PrivateEquitySecuritiesMember

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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(h)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph h -Article 7 + Details
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- Definition Other long-term investments not otherwise specified in the taxonomy, not including investments in marketable securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph f -Article 7 + Details
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