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Subsequent event - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Apr. 19, 2023
Feb. 28, 2023
Dec. 31, 2022
Disclosure of non-adjusting events after reporting period [line items]      
Consideration paid     $ 993.0
Major ordinary share transactions [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Consideration paid   $ 268.0  
Share per price   $ 8.68  
Major ordinary share transactions [member] | AMTD Assets Group [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Consideration transferred, acquisition-date fair value   $ 500.0  
Percentage of equity transferred   100.00%  
Class A Ordinary Shares [Member] | Major ordinary share transactions [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Newly issued ordinary shares 90,000,000    
Proceeds from issuing shares $ 93.6    
Class B Ordinary Shares [Member] | Major ordinary share transactions [member]      
Disclosure of non-adjusting events after reporting period [line items]      
Newly issued ordinary shares   30,875,576