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Related Party Transactions - Summary of Detailed Information About Additional Information of Transactions With Related Parties (Detail) - HKD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties [line items]      
Revenue from rendering of services, related party transactions $ 9,020,655 $ 105,448,459 $ 128,419,020
Interest income from immediate holding company 75,991,943 116,028,045 101,159,079
Consideration received for disposal of investments to a related party controlled by a director of the Company     972,215,580
Consideration received for settlement of derivatives contracts with a related party controlled by a director of the Company     618,682,641
AMTD Digital [Member]      
Disclosure of transactions between related parties [line items]      
Acquisition of AMTD Digital from immediate holding company and fellow subsidiaries 5,793,768,692    
Immediate holding company [Member]      
Disclosure of transactions between related parties [line items]      
Staff costs 31,986,661 22,081,545 20,156,843
Premises cost 11,507,635 13,964,993 14,010,263
Total of recharge from immediate holding company 43,494,296 36,046,538 34,167,106
Treasury shares repurchased from immediate holding company 2,500,000,000 5,000,000,000  
Former Fellow Subsidiary [Member]      
Disclosure of transactions between related parties [line items]      
Revenue from rendering of services, related party transactions   104,300,690  
Related Party [Member]      
Disclosure of transactions between related parties [line items]      
Net changes in fair value on derivative financial asset entered into with a related party controlled by a director of the Company     321,797,949
Financial Advisory Service [Member] | Fellow Subsidiaries [Member]      
Disclosure of transactions between related parties [line items]      
Revenue from rendering of services, related party transactions 20,655 1,147,769 30,233,187
Financial Advisory Service [Member] | Related Company [Member]      
Disclosure of transactions between related parties [line items]      
Revenue from rendering of services, related party transactions 9,000,000   98,185,833
Management Fee Income [Member] | Immediate holding company [Member]      
Disclosure of transactions between related parties [line items]      
Management fee paid to immediate holding company 137,500 150,000 150,000
Investment Advisory Fee [Member] | Fellow Subsidiaries [Member]      
Disclosure of transactions between related parties [line items]      
Services received, related party transactions 165,000 180,000 180,000
Insurance Commission [Member] | Immediate holding company [Member]      
Disclosure of transactions between related parties [line items]      
Services received, related party transactions 31,531    
Insurance Commission [Member] | Fellow Subsidiaries [Member]      
Disclosure of transactions between related parties [line items]      
Services received, related party transactions 1,662 58,228 105,251
Acquisition of Investment [Member] | Immediate holding company [Member]      
Disclosure of transactions between related parties [line items]      
Acquisition of investments from immediate holding company   163,180,000 556,161,528
Acquisition of Investment [Member] | Fellow Subsidiaries [Member]      
Disclosure of transactions between related parties [line items]      
Acquisition of investments from a fellow subsidiary   11,545,800 148,671,602
Administrative Service Fees [Member] | Immediate holding company [Member]      
Disclosure of transactions between related parties [line items]      
Administrative service fee paid to immediate holding company 29,500,000 24,000,000 24,000,000
Interest income [Member] | Immediate holding company [Member]      
Disclosure of transactions between related parties [line items]      
Interest income from immediate holding company 75,991,943 116,028,045 $ 101,159,079
Disposal of Investments [Member] | Former Fellow Subsidiary [Member]      
Disclosure of transactions between related parties [line items]      
Disposal of an investment to a related company   196,036,584  
Stock Loan Interest Income [Member] | Former Fellow Subsidiary [Member]      
Disclosure of transactions between related parties [line items]      
Stock lending interest income from a former fellow subsidiary   34,740  
Perpetual Securities Redeemed [Member] | Fellow Subsidiaries [Member]      
Disclosure of transactions between related parties [line items]      
Perpetual securities redeemed from a related company   4,648,331  
Perpetual Securities Redeemed [Member] | Former Fellow Subsidiary [Member]      
Disclosure of transactions between related parties [line items]      
Perpetual securities redeemed from a related company   $ 35,719,218  
Digital Solutions and Other Services Income [Member] | Immediate holding company [Member]      
Disclosure of transactions between related parties [line items]      
Services received, related party transactions 12,466,667    
Fashion and luxury media advertising and marketing services [Member] | Immediate holding company [Member]      
Disclosure of transactions between related parties [line items]      
Revenue from rendering of services, related party transactions $ 22,616,160