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Principal accounting policies - Additional Information (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2025
$ / shares
Mar. 31, 2025
Sep. 30, 2024
$ / shares
Mar. 31, 2024
$ / shares
Dec. 31, 2025
CNY (¥)
item
$ / ¥
shares
Dec. 31, 2025
USD ($)
item
shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2023
CNY (¥)
shares
Significant Accounting Policies                
Rate of translations of amounts from RMB into US$ | $ / ¥         6.9931      
Equity method investment, other than temporary impairment         ¥ 0   ¥ 0 ¥ 0
Impairment loss of investments         43,698   166,127 210,813
Indefinitely lived intangible assets net         ¥ 0   0  
Number of reporting units | item         2 2    
Impairment of goodwill         ¥ 0   0 0
Impairment of long-lived assets         ¥ 0   0 0
Noble member status duration         1 month 1 month    
Advertising revenues contract term         3 months 3 months    
Period over which payments are due         3 months 3 months    
Deferred revenue, revenue recognized         ¥ 265,628   412,257 446,881
Revenue expected to be recognized from remaining performance obligations         259,991      
Employee social security and welfare benefits         136,623   142,272 194,779
Allocated share-based compensation expense         73,592 $ 10,523 64,520 78,265
Interest and penalties recognized associated with uncertain tax positions         0   0 0
Unrecognized uncertain tax positions         ¥ 0   0  
Minimum percentage appropriation to general reserve fund required         10.00%      
Reserve level threshold for mandatory appropriation requirement (as a percent)         50.00% 50.00%    
Appropriations for the general reserve funds and statutory surplus fund         ¥ 0   0 0
Fair value changes         ¥ 120,027   ¥ 145,458 ¥ 35,811
Special cash dividend declared Q1 2024                
Significant Accounting Policies                
Dividends Payable, Date Declared       Mar. 19, 2024        
Dividends Payable, Date of Record       May 10, 2024        
Special cash dividend declared Q3 2024                
Significant Accounting Policies                
Dividends Payable, Date Declared     Aug. 13, 2024          
Dividends Payable, Date of Record     Oct. 09, 2024          
Dividends declared for the years 2025                
Significant Accounting Policies                
Dividends Payable, Date Declared   Mar. 18, 2025            
Dividends Payable, Date of Record Jun. 17, 2025              
Dividends declared for the years 2026                
Significant Accounting Policies                
Dividends Payable, Date Declared   Mar. 18, 2025            
Maximum                
Significant Accounting Policies                
Noble member status duration         24 months 24 months    
Ordinary Shares | Special cash dividend declared Q1 2024                
Significant Accounting Policies                
Special cash dividend declared (in USD per share) | $ / shares       $ 0.66        
Ordinary Shares | Special cash dividend declared Q3 2024                
Significant Accounting Policies                
Special cash dividend declared (in USD per share) | $ / shares     $ 1.08          
Ordinary Shares | Dividends declared for the years 2025                
Significant Accounting Policies                
Cash dividend per ordinary share | $ / shares $ 1.47              
American Depository Shares | Special cash dividend declared Q1 2024                
Significant Accounting Policies                
Special cash dividend declared (in USD per share) | $ / shares       $ 0.66        
American Depository Shares | Special cash dividend declared Q3 2024                
Significant Accounting Policies                
Special cash dividend declared (in USD per share) | $ / shares     $ 1.08          
American Depository Shares | Dividends declared for the years 2025                
Significant Accounting Policies                
Cash dividend per ordinary share | $ / shares $ 1.47              
Performance Shares                
Significant Accounting Policies                
Share-based compensation arrangement by share-based payment award, other than options granted | shares         0 0 0 0
Allocated share-based compensation expense         ¥ 0   ¥ 0 ¥ 0
Research and development expenses                
Significant Accounting Policies                
Capitalized costs         0   0 0
Severance costs         23,458   25,857 34,000
Allocated share-based compensation expense         22,772 $ 3,256 27,269 40,679
Sales and marketing expenses                
Significant Accounting Policies                
Advertising and market promotion expenses         229,478   233,149 348,235
Allocated share-based compensation expense         ¥ 1,141 $ 163 ¥ 1,147 ¥ 2,842