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Taxation - Reconciliation Between Statutory Enterprise Income Tax Rate and Effective Tax Rate (Parenthetical) (Details)
¥ in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Income Taxes [Line Items]            
Current income tax expense   ¥ 831,675   ¥ 594,149 ¥ 352,036  
Deferred tax assets, valuation allowance   6,756   4,429 6,662 ¥ 6,785
Income tax expense applicable to China operations   ¥ 435,418 $ 68,327 ¥ 90,629 ¥ 411,959  
Preferential tax rate       2.40%    
Changes in valuation allowance   0.10% 0.10% (0.30%)    
Maximum            
Income Taxes [Line Items]            
Changes in valuation allowance         0.10%  
PRC            
Income Taxes [Line Items]            
Preferential tax rate 10.00%          
PRC | Revision of Prior Period Correction            
Income Taxes [Line Items]            
Income tax expense applicable to China operations ¥ 16,200