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Summary of Principal Accounting Policies - Additional Information (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Apr. 30, 2018
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 30, 2022
Significant Accounting Policies [Line Items]              
Consolidated assets   ¥ 11,798,135   ¥ 10,889,789   $ 1,710,568  
Cash and cash equivalents   ¥ 4,403,915   ¥ 3,404,603 ¥ 5,005,211 638,508  
Account receivable balance due   1 year 1 year 1 year      
Deferred revenue recognized   ¥ 54,800   ¥ 67,800 91,700    
Revenue, Practical Expedient, Financing Component [true false]   true true        
Government subsidies   ¥ 129,521 $ 18,779 115,939 113,356    
Foreign currency exchange rate, translation             6.8972
Operating lease right-of-use assets, net   168,192   223,652   24,386  
Gain (Loss) on Sale of Loans and Leases   0          
Fair value gain   105,856          
Decrease in Noah's equity by acquiring equity interests from non-controlling interests for cash considerations       178,800      
Total revenues   ¥ 3,128,877 $ 453,644 ¥ 4,326,600 3,324,712    
Mainland China              
Significant Accounting Policies [Line Items]              
VAT rate one (as a percent) 3.00%            
VAT rate two (as a percent) 6.00%            
VAT rate three (as a percent) 9.00%            
VAT rate four (as a percent) 13.00%            
Primary VAT rate applicable to VIEs 6.00%            
Investments Member | Product Concentration Risk | Net Revenue              
Significant Accounting Policies [Line Items]              
Concentration risk percentage   11.10% 11.10% 11.40%      
Consolidated Fund              
Significant Accounting Policies [Line Items]              
Cash and cash equivalents   ¥ 11,455   ¥ 24,806      
Variable Interest Entity, Primary Beneficiary [Member]              
Significant Accounting Policies [Line Items]              
Consolidated assets   3,587,320   3,332,970   520,113  
Cash and cash equivalents   1,566,729   1,181,479   227,154  
Operating lease right-of-use assets, net   13,598   15,031   $ 1,972  
Total revenues   1,289,672 $ 186,984 1,514,458 984,744    
Operating cost and expenses   586,993 $ 85,106 ¥ 867,215 ¥ 524,913    
Variable Interest Entity, Primary Beneficiary [Member] | Asset Pledged as Collateral [Member]              
Significant Accounting Policies [Line Items]              
Consolidated assets   ¥ 0          
Variable Interest Entity, Primary Beneficiary [Member] | Credit Concentration Risk | Net Revenue              
Significant Accounting Policies [Line Items]              
Percentage of net revenue   41.40% 41.40% 35.10% 29.60%    
Variable Interest Entity, Primary Beneficiary [Member] | Credit Concentration Risk | Net Income (Loss)              
Significant Accounting Policies [Line Items]              
Percentage of net income   66.40% 66.40% 36.20% 47.20%    
Variable Interest Entity, Primary Beneficiary [Member] | Credit Concentration Risk | Total Assets              
Significant Accounting Policies [Line Items]              
Percentage of total assets   30.40% 30.40% 30.60%      
Variable Interest Entity, Primary Beneficiary [Member] | Investments Member              
Significant Accounting Policies [Line Items]              
Assets, deconsolidation   ¥ 757,800          
Liabilities, deconsolidation   108,600          
Non-controlling interests, deconsolidation   649,200          
Intragroup transactions              
Significant Accounting Policies [Line Items]              
Total revenues   64,419   ¥ 38,399 ¥ 43,101    
Operating cost and expenses   ¥ 264,376   ¥ 186,962 ¥ 141,702    
Minimum              
Significant Accounting Policies [Line Items]              
Ownership percentage in affiliate to represent influence   20.00% 20.00%