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Long-term debt - Additional Information (Details)
 1 Months Ended 12 Months Ended
Nov. 30, 2021
USD ($)
Jun. 30, 2020
CNY (¥)
Jun. 30, 2020
USD ($)
Apr. 30, 2019
CNY (¥)
Apr. 30, 2019
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jan. 31, 2023
CNY (¥)
Jan. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Nov. 30, 2021
CNY (¥)
Nov. 30, 2021
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Jun. 01, 2020
$ / shares
Apr. 30, 2019
USD ($)
Apr. 01, 2019
$ / shares
Debt Instrument [Line Items]                                                
Long-term debt principal amount           ¥ 95,692,000   ¥ 652,000                                
Unamortized debt issuance costs           (539,000)   (6,000)                                
Gain (loss) on repurchase of debt instrument           (38,629,000) $ (5,292,000) 292,213,000   ¥ 1,318,594,000                            
Long-Term Debt, Maturity, Year One           500,000                                    
Long-term debt, Maturity, Year two and three           96,700,000                                    
Long-term debt, Maturity, After year three           0                                    
Long-term bank loans           3,069,000,000               $ 420,500,000                    
Fair Value, Inputs, Level 2 [Member]                                                
Debt Instrument [Line Items]                                                
Long-term debt, Fair value           96,100,000                                    
April 2026 Notes [Member]                                                
Debt Instrument [Line Items]                                                
Long-term debt principal amount           ¥ 86,300   3,040,900,000                             $ 500,000,000  
Long-term debt interest rate       1.375%   1.74%               1.74%                 1.375%  
Proceeds from issuance of Long-term Debt, net of issuance cost       ¥ 3,356,100,000 $ 488,200,000                                      
Long-term debt issuance cost       ¥ 81,100,000                                     $ 11,800,000  
Unamortized debt issuance costs           ¥ 400   23,600,000                                
Interest expense debt           13,100,000 1,800,000   $ 7,400,000   $ 7,300,000                          
Debt conversion, Original debt, Amount | $                     14,000   $ 70,600,000                      
Debt instrument repurchased face amount           3,000,000,000               $ 429,300,000                    
Repayments of notes payable           3,000,000,000 429,300,000                                  
Gain (loss) on repurchase of debt instrument           (21,000,000) (3,000,000)                                  
Long-term bank loans               3,017,339,000                                
2027 Notes [Member]                                                
Debt Instrument [Line Items]                                                
Long-term debt principal amount           ¥ 700,000   700,000                         $ 800,000,000      
Long-term debt interest rate   1.25%       1.52%               1.52%             1.25%      
Proceeds from issuance of Long-term Debt, net of issuance cost   ¥ 5,594,800,000 $ 786,100,000                                          
Long-term debt issuance cost   ¥ 98,600,000                                     $ 13,900,000      
Debt instrument repurchase face amount percentage   100.00% 100.00%                                          
Unamortized debt issuance costs           ¥ 4,200   5,700                                
Interest expense debt           9,800 1,400   5,000,000   11,800,000                          
Debt conversion, Original debt, Amount | $                         $ 1,000                      
Debt instrument repurchased face amount               5,300,000,000   385,700,000         $ 745,900,000     $ 54,000,000            
Repayments of notes payable               5,300,000,000 745,900,000 352,000,000 49,300,000                          
Gain (loss) on repurchase of debt instrument               (54,000,000) (7,600,000) 29,300,000 4,100,000                          
Long-term bank loans           657,000                                    
December 2026 Notes [Member]                                                
Debt Instrument [Line Items]                                                
Long-term debt principal amount           ¥ 95,600,000   3,062,600,000               ¥ 2,600,000,000 $ 384,800,000     $ 1,600,000,000        
Long-term debt interest rate           0.80%               0.80%         0.50% 0.50%        
Proceeds from issuance of Long-term Debt, net of issuance cost $ 1,576,600,000                     ¥ 10,100,000,000                        
Long-term debt issuance cost                                     ¥ 149,600,000 $ 23,400,000        
Unamortized debt issuance costs           ¥ 500,000   26,200,000                                
Interest expense debt           22,400,000 3,100,000   3,600,000   11,000,000                          
Debt instrument repurchased face amount           3,000,000,000   104,000,000   5,200,000,000       $ 419,100,000 14,500,000     $ 768,300,000            
Repayments of notes payable             419,100,000 93,300,000 13,000,000 3,800,000,000 568,600,000                          
Gain (loss) on repurchase of debt instrument           (17,700,000) $ (2,500,000) 9,800,000 1,400,000 ¥ 1,289,500,000 $ 190,300,000                          
Long-term bank loans               3,036,428,000                                
Convertible Senior Notes Due April 2027 [Member]                                                
Debt Instrument [Line Items]                                                
Amount of covertible debt           700,000               91,400                    
Notes Payable to Banks [Member]                                                
Debt Instrument [Line Items]                                                
Long-Term Debt, Maturity, Year One           31,000,000                                    
Long-term bank loans           31,000,000               4,200,000                    
Group long term loans from bank           ¥ 3,100,000,000               $ 424,700,000                    
American Depository Shares [Member] | April 2026 Notes [Member]                                                
Debt Instrument [Line Items]                                                
Long-term debt principal amount | $                                             $ 1,000  
Convertible debt, conversion rate       40.404 40.404                                      
Convertible debt, conversion price | $ / shares                                               $ 24.75
Debt conversion, Converted instrument, Shares issued | shares                   565 565 2,854,253 2,854,253                      
American Depository Shares [Member] | 2027 Notes [Member]                                                
Debt Instrument [Line Items]                                                
Long-term debt principal amount | $                                         $ 1,000      
Convertible debt, conversion rate   24.5516 24.5516                                          
Convertible debt, conversion price | $ / shares                                           $ 40.73    
Debt conversion, Converted instrument, Shares issued | shares                       24 24                      
American Depository Shares [Member] | December 2026 Notes [Member]                                                
Debt Instrument [Line Items]                                                
Long-term debt principal amount | $                                       $ 1,000        
Convertible debt, conversion rate 10.6419                                              
Convertible debt, conversion price | $ / shares                                       $ 93.97        
Debt instrument repurchased face amount               2,600,000,000             384,800,000                  
Debt instrument repurchased amount               2,200,000,000             $ 331,200,000 ¥ 2,200,000,000 $ 331,200,000              
Gain (loss) on repurchase of debt instrument               ¥ 336,500,000 $ 49,500,000                              
Long-term debt due in more than one year [Member]                                                
Debt Instrument [Line Items]                                                
Average interest rate           2.40%               2.40%