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Summary of Principal Accounting Policies - Additional Information (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Jan. 01, 2019
Apr. 30, 2018
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2018
CNY (¥)
Significant Accounting Policies [Line Items]                
Consolidated assets     ¥ 10,889,789   ¥ 9,399,586   $ 1,708,847  
Cash and cash equivalent     3,404,603   5,005,211 ¥ 4,387,345 534,257  
Shareholders' Equity     8,141,641   7,277,371 7,874,960 1,277,603 ¥ 6,175,377
Non-controlling interests     100,866   91,860   $ 15,829  
Net income (loss) attributable to non-controlling interests     (8,050) $ (1,263) 1,703 34,608    
Accounts receivable, allowance for doubtful accounts     ¥ 458   ¥ 0      
Account receivable balance due     1 year 1 year 1 year      
Deferred revenue recognized     ¥ 67,800   ¥ 91,700 133,500    
Revenue, Practical Expedient, Financing Component [true false]     true true        
Revenue, Practical Expedient, Initial Application and Transition, Nondisclosure of Transaction Price Allocation to Remaining Performance Obligation [true false]     true true        
Government subsidies     ¥ 115,939 $ 18,193 113,356 89,278    
Foreign currency exchange rate, translation     6.3726       6.3726  
Operating lease right-of-use assets, net     ¥ 223,652   274,154   $ 35,096  
Operating lease liability     222,244   280,856   34,875  
Retained earnings     5,187,323   3,989,767   814,005  
Gain (Loss) on Sale of Loans and Leases     0          
Decrease in Noah's equity by acquiring equity interests from non-controlling interests for cash considerations     178,800          
Revenues     4,326,600 $ 678,938 3,324,712 3,413,176    
Retained Earnings                
Significant Accounting Policies [Line Items]                
Shareholders' Equity     ¥ 5,187,323   3,989,767 4,734,992   ¥ 3,946,107
ASU 2016-02                
Significant Accounting Policies [Line Items]                
Lease, Practical Expedients, Package [true false] true              
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     11.40% 11.40%        
Consolidated Fund                
Significant Accounting Policies [Line Items]                
Cash and cash equivalent     ¥ 24,806   8,335      
Variable Interest Entity, Primary Beneficiary                
Significant Accounting Policies [Line Items]                
Consolidated assets     3,332,970   2,653,128   523,017  
Cash and cash equivalent     1,181,479   839,534   185,400  
Operating lease right-of-use assets, net     15,031   19,010   $ 2,359  
Revenues     1,514,458 $ 237,651 984,744 872,066    
Operating cost and expenses     867,215 $ 136,085 ¥ 524,913 ¥ 565,203    
Variable Interest Entity, Primary Beneficiary | Asset Pledged as Collateral [Member]                
Significant Accounting Policies [Line Items]                
Consolidated assets     ¥ 0          
Variable Interest Entity, Primary Beneficiary | Credit Concentration Risk | Net Revenue                
Significant Accounting Policies [Line Items]                
Percentage of net revenue     35.10% 35.10% 29.60% 25.60%    
Variable Interest Entity, Primary Beneficiary | Credit Concentration Risk | Net Income (Loss)                
Significant Accounting Policies [Line Items]                
Percentage of net income     36.20% 36.20% 47.20% 33.50%    
Variable Interest Entity, Primary Beneficiary | Credit Concentration Risk | Total Assets                
Significant Accounting Policies [Line Items]                
Percentage of total assets     30.60% 30.60% 28.20%      
Variable Interest Entity, Primary Beneficiary | 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]                
Revenues     0   ¥ 0 ¥ 50,670    
Operating cost and expenses     ¥ 0   ¥ 141,702 ¥ 184,712    
Minimum                
Significant Accounting Policies [Line Items]                
Ownership percentage in affiliate to represent influence     20.00% 20.00%