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Accounting policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2023
km
Hours
Feb. 29, 2024
Translation of amounts from Renminbi to the US Dollar [member]    
Disclosure of Summary of Significant Accounting Policies [Line items]    
Convenience translation exchange rate per US$1.00   7.1036
Bottom of range [member] | On-Road Applications Engines [member]    
Disclosure of Summary of Significant Accounting Policies [Line items]    
Warranty claim period 3 months  
Warranty mileage | km 5,000  
Bottom of range [member] | Other Applications Engines [member]    
Disclosure of Summary of Significant Accounting Policies [Line items]    
Warranty claim period 2 months  
Product warranty running hours | Hours 300  
Top of range [member] | On-Road Applications Engines [member]    
Disclosure of Summary of Significant Accounting Policies [Line items]    
Warranty claim period 36 months  
Warranty mileage | km 300,000  
Top of range [member] | Other Applications Engines [member]    
Disclosure of Summary of Significant Accounting Policies [Line items]    
Warranty claim period 60 months  
Product warranty running hours | Hours 15,000