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

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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