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Summary of Subsidiaries (Detail)
 12 Months Ended
Dec. 31, 2012
Shanghai Noah Rongyao Investment Consulting Co., Ltd
  
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]  
Date of Incorporation Aug. 24, 2007
Place of Incorporation PRC
Percentage of Ownership 100.00%
Shanghai Noah Financial Services Co., Ltd
  
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]  
Date of Incorporation Apr. 18, 2008 [1]
Place of Incorporation PRC [1]
Percentage of Ownership 100.00% [1]
Noah Private Wealth Management Hong Kong Limited
  
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]  
Date of Incorporation Jan. 03, 2011
Place of Incorporation Hong Kong
Percentage of Ownership 100.00%
Shanghai Rongyao Information Technology Co., Ltd
  
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]  
Date of Incorporation Mar. 02, 2011
Place of Incorporation PRC
Percentage of Ownership 100.00%
Kunshan Noah Xingguan Investment Management Co., Ltd
  
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]  
Date of Incorporation Aug. 12, 2011
Place of Incorporation PRC
Percentage of Ownership 100.00%
Noah Holdings Hong Kong Limited
  
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]  
Date of Incorporation Sep. 01, 2011
Place of Incorporation Hong Kong
Percentage of Ownership 100.00%
[1] In August 2012, Shanghai Noah Yuanzheng Investment Consulting Co., Ltd. was renamed as Shanghai Noah Financial Service Co., Ltd., after it obtained the regulatory approval to authorize its business scope to include providing investment advisory wealth management and related financial services.