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Investments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Investment income | $ 6,312,498 us-gaap_InvestmentIncomeInterest | $ 3,302,545 us-gaap_InvestmentIncomeInterest | $ 2,451,731 us-gaap_InvestmentIncomeInterest
Held-to-maturity investments, long-term | 5,157,464 us-gaap_HeldToMaturitySecuritiesNoncurrent | 10,480,964 us-gaap_HeldToMaturitySecuritiesNoncurrent |
Other comprehensive income-change in fair value of available-for-sale investments | 832,372 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax |  |
Other comprehensive income-realized gains reclassified from other comprehensive income to "investment income" | 410,048 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax |  |
Other comprehensive income-net unrealized gains on the available-for-sale investments | 422,324 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |
Amortized cost of the available-for-sale investments | 14,324,227 us-gaap_AvailableForSaleSecuritiesAmortizedCost |  |
Held-to-maturity investments |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Investment income | 2,027,454 us-gaap_InvestmentIncomeInterest / invest_InvestmentAxis = us-gaap_HeldtomaturitySecuritiesMember | 2,510,647 us-gaap_InvestmentIncomeInterest / invest_InvestmentAxis = us-gaap_HeldtomaturitySecuritiesMember | 3,044,856 us-gaap_InvestmentIncomeInterest / invest_InvestmentAxis = us-gaap_HeldtomaturitySecuritiesMember
Interest receivable | 862,001 us-gaap_InterestReceivable / invest_InvestmentAxis = us-gaap_HeldtomaturitySecuritiesMember | 856,068 us-gaap_InterestReceivable / invest_InvestmentAxis = us-gaap_HeldtomaturitySecuritiesMember | 539,586 us-gaap_InterestReceivable / invest_InvestmentAxis = us-gaap_HeldtomaturitySecuritiesMember
Held-to-maturity investments | Debt Securities of Certain Real Estate Funds |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity securities |  | 7,100,203 us-gaap_HeldToMaturitySecurities / invest_InvestmentAxis = us-gaap_HeldtomaturitySecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_DebtSecuritiesMember | 11,917,947 us-gaap_HeldToMaturitySecurities / invest_InvestmentAxis = us-gaap_HeldtomaturitySecuritiesMember / us-gaap_InvestmentTypeAxis = us-gaap_DebtSecuritiesMember
Held-to-maturity securities, 2016 |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity investments, long-term | 2,095,220 us-gaap_HeldToMaturitySecuritiesNoncurrent / invest_InvestmentAxis = noah_HeldToMaturitySecuritiesTwoThousandAndSixteenMember |  |
Held-to-maturity securities, 2017 |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity investments, long-term | 1,450,536 us-gaap_HeldToMaturitySecuritiesNoncurrent / invest_InvestmentAxis = noah_HeldToMaturitySecuritiesTwoThousandAndSeventeenMember |  |
Held-to-maturity securities, 2019 |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Held-to-maturity investments, long-term | 1,611,708 us-gaap_HeldToMaturitySecuritiesNoncurrent / invest_InvestmentAxis = noah_HeldToMaturitySecuritiesTwoThousandAndNineteenMember |  |
Trading Securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Investment income | 1,390,200 us-gaap_InvestmentIncomeInterest / invest_InvestmentAxis = us-gaap_TradingAccountAssetsMember | 1,413,810 us-gaap_InvestmentIncomeInterest / invest_InvestmentAxis = us-gaap_TradingAccountAssetsMember |
PPDAI Group Inc. | Series B Preferred Stock |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Payment to acquire investment | $ 2,224,999 us-gaap_PaymentsToAcquireInvestments / invest_InvestmentAxis = noah_InvestmentOneMember / us-gaap_InvestmentTypeAxis = us-gaap_SeriesBPreferredStockMember |  |
Percentage of investee's issued share capital | 2.62%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / invest_InvestmentAxis = noah_InvestmentOneMember / us-gaap_InvestmentTypeAxis = us-gaap_SeriesBPreferredStockMember |  |

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: 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) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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