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Income tax expense - Additional Information (Details)
¥ in Thousands, ₩ in Millions
12 Months Ended
Dec. 31, 2023
KRW (₩)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
Dec. 31, 2018
Dec. 31, 2023
CNY (¥)
Income tax          
Statutory tax rate (as a percent) 25.00% 25.00% 25.00%    
High and New Technology Enterprise | Shenzhen Wuxin Technology Co., Ltd. [Member]          
Income tax          
Preferential tax rate 15.00%        
Cayman Islands          
Income tax          
Withholding tax | ¥         ¥ 0
Hong Kong          
Income tax          
Statutory tax rate (as a percent) 16.50%        
Withholding income tax on dividends distributed two 5.00%        
Hong Kong | Minimum [Member]          
Income tax          
Withholding income tax on dividends distributed two 10.00%        
Hong Kong | Maximum [Member]          
Income tax          
Withholding income tax on dividends distributed two 15.00%        
PRC          
Income tax          
Statutory tax rate (as a percent) 25.00%        
Additional tax deduction on qualified research and development expenses (as a percent) 75.00% 75.00%   50.00%  
Additional tax deduction on qualified research and development expenses in certain qualified manufacture industry (as a percent) 100.00%        
Withholding income tax on dividends distributed one 10.00%        
Percentage of share in FIE for withholding tax at a rate of no more than five percent 25.00%        
Undistributed earnings and reserves for distribution | ¥   ¥ 3,153,855     2,832,451
Withholding income tax for undistributed earnings of subsidiaries | ¥   0     0
Unrecognized tax liabilities | ¥   ¥ 315,386     ¥ 283,245
Shenzhen          
Income tax          
Preferential tax rate 15.00%        
Korea          
Income tax          
Withholding income tax on dividends distributed one 20.00%        
Korea | First Korean won (KRW) 200 million          
Income tax          
Statutory tax rate (as a percent) 9.00%        
Assessable income for taxable rate ₩ 200        
Korea | Taxable income over KRW200 million up to KRW20 billion          
Income tax          
Statutory tax rate (as a percent) 19.00%        
Korea | Taxable income over KRW20 billion up to KRW300 billion          
Income tax          
Statutory tax rate (as a percent) 21.00%        
Korea | Taxable income over KRW300 billion          
Income tax          
Statutory tax rate (as a percent) 24.00%        
Korea | Minimum [Member]          
Income tax          
Local income tax rate, percentage 0.90%        
Korea | Minimum [Member] | Taxable income over KRW200 million up to KRW20 billion          
Income tax          
Assessable income for taxable rate ₩ 20,000        
Korea | Minimum [Member] | Taxable income over KRW20 billion up to KRW300 billion          
Income tax          
Assessable income for taxable rate ₩ 20,000        
Korea | Maximum [Member]          
Income tax          
Local income tax rate, percentage 2.40%        
Korea | Maximum [Member] | Taxable income over KRW200 million up to KRW20 billion          
Income tax          
Assessable income for taxable rate ₩ 200        
Korea | Maximum [Member] | Taxable income over KRW20 billion up to KRW300 billion          
Income tax          
Assessable income for taxable rate ₩ 300,000        
Indonesia          
Income tax          
Statutory tax rate (as a percent) 0.50%