Segment Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Total third-party revenues	$ 129,454,969us-gaap_Revenues	$ 95,989,067us-gaap_Revenues	$ 65,780,848us-gaap_Revenues
Total related party revenues	132,793,592us-gaap_RevenueFromRelatedParties	77,329,868us-gaap_RevenueFromRelatedParties	25,982,724us-gaap_RevenueFromRelatedParties
Total revenues	262,248,561noah_GrossRevenue	173,318,935noah_GrossRevenue	91,763,572noah_GrossRevenue
Less: business taxes and related surcharges	(14,380,469)noah_BusinessTaxAndSurcharges	(9,547,102)noah_BusinessTaxAndSurcharges	(5,068,066)noah_BusinessTaxAndSurcharges
Net revenues	247,868,092us-gaap_SalesRevenueNet	163,771,833us-gaap_SalesRevenueNet	86,695,506us-gaap_SalesRevenueNet
Operating cost and expenses:
Relationship manager compensation	(52,246,943)us-gaap_OfficersCompensation	(33,436,866)us-gaap_OfficersCompensation	(17,551,483)us-gaap_OfficersCompensation
Performance fee compensation	(3,536,240)
Other compensations	(63,826,889)us-gaap_OtherLaborRelatedExpenses	(39,606,754)us-gaap_OtherLaborRelatedExpenses	(24,823,446)us-gaap_OtherLaborRelatedExpenses
Total compensation and benefits	(119,610,072)us-gaap_LaborAndRelatedExpense	(73,043,620)us-gaap_LaborAndRelatedExpense	(42,374,929)us-gaap_LaborAndRelatedExpense
Selling expenses	(23,896,620)us-gaap_SellingExpense	(16,660,044)us-gaap_SellingExpense	(13,449,421)us-gaap_SellingExpense
General and administrative expenses	(24,611,880)us-gaap_GeneralAndAdministrativeExpense	(18,087,184)us-gaap_GeneralAndAdministrativeExpense	(8,901,330)us-gaap_GeneralAndAdministrativeExpense
Other operating expenses	(4,861,700)us-gaap_OtherExpenses	(734,300)us-gaap_OtherExpenses	(419,822)us-gaap_OtherExpenses
Government subsidies	14,792,142noah_GovernmentSubsidies	5,323,670noah_GovernmentSubsidies	4,295,029noah_GovernmentSubsidies
Total operating cost and expenses	(158,188,130)us-gaap_CostsAndExpenses	(103,201,478)us-gaap_CostsAndExpenses	(60,850,473)us-gaap_CostsAndExpenses
Income from operations	89,679,962us-gaap_OperatingIncomeLoss	60,570,355us-gaap_OperatingIncomeLoss	25,845,033us-gaap_OperatingIncomeLoss
One Time Commissions
Revenues:
Total third-party revenues	68,698,354	57,972,609	39,486,943
Total related party revenues	29,322,581	20,841,594	9,392,131
Recurring Service Fees
Revenues:
Total third-party revenues	51,892,138	32,951,345	25,321,982
Total related party revenues	90,885,669	55,508,435	16,590,593
Other Service
Revenues:
Total third-party revenues	8,864,477	5,065,113	971,923
Total related party revenues	12,585,342	979,839
Wealth Management
Revenues:
Total third-party revenues	111,653,144	91,138,933	65,521,321
Total related party revenues	85,319,728	58,088,317	22,004,151
Total revenues	196,972,872	149,227,250	87,525,472
Less: business taxes and related surcharges	(11,129,939)	(8,237,942)	(4,833,186)
Net revenues	185,842,933	140,989,308	82,692,286
Operating cost and expenses:
Relationship manager compensation	(51,843,587)	(33,362,053)	(17,551,483)
Other compensations	(34,851,929)	(31,077,968)	(22,810,897)
Total compensation and benefits	(86,695,516)	(64,440,021)	(40,362,380)
Selling expenses	(21,951,311)	(15,117,644)	(13,407,087)
General and administrative expenses	(12,117,434)	(14,037,239)	(8,385,882)
Other operating expenses	(3,836,816)	(694,460)	(414,959)
Government subsidies	10,943,240	4,997,145	4,295,029
Total operating cost and expenses	(113,657,837)	(89,292,219)	(58,275,279)
Income from operations	72,185,096	51,697,089	24,417,007
Wealth Management \| One Time Commissions
Revenues:
Total third-party revenues	68,698,354	57,760,283	39,486,943
Total related party revenues	29,322,581	20,404,683	9,392,131
Wealth Management \| Recurring Service Fees
Revenues:
Total third-party revenues	39,462,923	28,434,140	25,062,455
Total related party revenues	55,589,582	37,492,722	12,612,020
Wealth Management \| Other Service
Revenues:
Total third-party revenues	3,491,867	4,944,510	971,923
Total related party revenues	407,565	190,912
Asset Management Business
Revenues:
Total third-party revenues	15,084,936	4,850,134	259,527
Total related party revenues	47,329,945	19,241,551	3,978,573
Total revenues	62,414,881	24,091,685	4,238,100
Less: business taxes and related surcharges	(3,127,877)	(1,309,160)	(234,880)
Net revenues	59,287,004	22,782,525	4,003,220
Operating cost and expenses:
Relationship manager compensation	(38,246)	(74,813)
Performance fee compensation	(3,536,240)
Other compensations	(20,282,224)	(8,528,786)	(2,012,549)
Total compensation and benefits	(23,856,710)	(8,603,599)	(2,012,549)
Selling expenses	(1,583,422)	(1,542,400)	(42,334)
General and administrative expenses	(9,755,093)	(4,049,945)	(515,448)
Other operating expenses	(272,047)	(39,840)	(4,863)
Government subsidies	3,844,512	326,525
Total operating cost and expenses	(31,622,760)	(13,909,259)	(2,575,194)
Income from operations	27,664,244	8,873,266	1,428,026
Asset Management Business \| One Time Commissions
Revenues:
Total third-party revenues		212,326
Total related party revenues		436,911
Asset Management Business \| Recurring Service Fees
Revenues:
Total third-party revenues	12,429,215	4,517,205	259,527
Total related party revenues	35,291,220	18,015,713	3,978,573
Asset Management Business \| Other Service
Revenues:
Total third-party revenues	2,655,721	120,603
Total related party revenues	12,038,725	788,927
Internet Finance Business
Revenues:
Total third-party revenues	2,716,889
Total related party revenues	143,919
Total revenues	2,860,808
Less: business taxes and related surcharges	(122,653)
Net revenues	2,738,155
Operating cost and expenses:
Relationship manager compensation	(365,110)
Other compensations	(8,692,736)
Total compensation and benefits	(9,057,846)
Selling expenses	(361,887)
General and administrative expenses	(2,739,353)
Other operating expenses	(752,837)
Government subsidies	4,390
Total operating cost and expenses	(12,907,533)
Income from operations	(10,169,378)
Internet Finance Business \| Recurring Service Fees
Revenues:
Total related party revenues	4,867
Internet Finance Business \| Other Service
Revenues:
Total third-party revenues	2,716,889
Total related party revenues	$ 139,052

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