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Intangible assets excluding goodwill - Expected useful lives of intangible assets excluding goodwill (Detail)
12 Months Ended
Dec. 31, 2020
Bottom of range [member] | Brand names [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 2 years
Bottom of range [member] | Customer-related intangible assets [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 2 years
Bottom of range [member] | Technology-based intangible assets [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 3 years
Bottom of range [member] | Other intangible assets [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 1 year
Bottom of range [member] | Computer software [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 1 year
Bottom of range [member] | Product development [Member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 3 years
Top of range [member] | Brand names [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 20 years
Top of range [member] | Customer-related intangible assets [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 25 years
Top of range [member] | Technology-based intangible assets [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 20 years
Top of range [member] | Other intangible assets [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 10 years
Top of range [member] | Computer software [member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 10 years
Top of range [member] | Product development [Member]  
Intangible assets excluding goodwill [Line Items]  
Useful life measured as period of time, intangible assets other than goodwill 7 years