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Accounting policies - Summary Of Policies Applied To The Group's Intangible Assets - (Detail)
 12 Months Ended
Dec. 31, 2023
Trademarks [member]  
Disclosure of detailed information about intangible assets [line items]  
Description of useful life, intangible assets other than goodwill Indefinite
Amortisation method, intangible assets other than goodwill No amortization
Description Of Intangible Asset Recognition Acquired
Technology know how [member]  
Disclosure of detailed information about intangible assets [line items]  
Amortisation method, intangible assets other than goodwill Amortized on a straight-line basis over the period of the technology know-how
Description Of Intangible Asset Recognition Internally generated
Technology know how [member] | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 6 years
Technology know how [member] | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Useful life measured as period of time, intangible assets other than goodwill 10 years
Development costs [member]  
Disclosure of detailed information about intangible assets [line items]  
Description Of Intangible Asset Recognition Internally generated