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Property and Equipment, Net (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Leasehold improvements	$ 9,027,914us-gaap_LeaseholdImprovementsGross	$ 6,284,893us-gaap_LeaseholdImprovementsGross
Furniture, fixtures and equipment	6,756,800us-gaap_FurnitureAndFixturesGross	4,217,114us-gaap_FurnitureAndFixturesGross
Motor vehicles	1,168,695us-gaap_PropertyPlantAndEquipmentOther	1,053,463us-gaap_PropertyPlantAndEquipmentOther
Software	4,344,738us-gaap_CapitalizedComputerSoftwareGross	2,593,932us-gaap_CapitalizedComputerSoftwareGross
Property, Plant and Equipment, Gross, Total	21,298,147us-gaap_PropertyPlantAndEquipmentGross	14,149,402us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation	(8,107,758)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	(5,409,226)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property Plant And Equipment Net Excluding Construction In Progress, Total	13,190,389noah_PropertyPlantAndEquipmentNetExcludingConstructionInProgress	8,740,176noah_PropertyPlantAndEquipmentNetExcludingConstructionInProgress
Construction in progress	1,662,177us-gaap_ConstructionInProgressGross	672,137us-gaap_ConstructionInProgressGross
Property and equipment, net	$ 14,852,566us-gaap_PropertyPlantAndEquipmentNet	$ 9,412,313us-gaap_PropertyPlantAndEquipmentNet

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Property Plant And Equipment Net Excluding Construction In Progress

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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