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Acquisitions of Subsidiaries - Additional Information (Detail)
$ / shares in Units, € in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Feb. 06, 2023
USD ($)
Jan. 01, 2023
USD ($)
Apr. 20, 2022
USD ($)
Jan. 01, 2022
USD ($)
Aug. 31, 2022
$ / shares
shares
Feb. 28, 2022
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2023
EUR (€)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Business Acquisition [Line Items]                    
Stock issued during period value purchase of assets             $ 3,154      
Revenues             130,914   $ 175,171 $ 179,815
Net income (loss) attributable to parent             153,383   160,466 $ 157,180
Business combination, bargain purchase, gain recognized, amount             4,469   4,848  
Payments to acquire businesses, gross                 62,800  
Capital Reserve [Member]                    
Business Acquisition [Line Items]                    
Stock issued during period value purchase of assets             275,154      
Treasury Stock, Common [Member]                    
Business Acquisition [Line Items]                    
Stock issued during period value purchase of assets             $ (268,000)      
Amtd Assets [Member]                    
Business Acquisition [Line Items]                    
Business acquisition percentage of voting interests acquired         96.10%   100.00%      
Business combination, separately recognized transactions, additional disclosures, acquisition costs             $ 0      
Payments to acquire businesses, gross             0      
Amtd Assets [Member] | Capital Reserve [Member]                    
Business Acquisition [Line Items]                    
Stock issued during period value purchase of assets $ 275,154                  
Amtd Assets [Member] | Treasury Stock, Common [Member]                    
Business Acquisition [Line Items]                    
Payments for repurchase of equity             268,000      
Amtd Assets [Member] | Common Class B [Member]                    
Business Acquisition [Line Items]                    
Business acquisition equity interests issued or issuable number of shares issued | shares         30,875,576          
Business acquisition share price | $ / shares         $ 8.68          
Lofficiel [Member]                    
Business Acquisition [Line Items]                    
Business acquisition percentage of voting interests acquired     100.00%              
Revenues                 4,700  
Net income (loss) attributable to parent                 2,700  
Business combination, bargain purchase, gain recognized, amount             4,848      
Business combination, acquired receivable, fair value             1,855      
Business combination, acquired receivables, gross contractual amount             $ 2,492      
Business combination, separately recognized transactions, additional disclosures, acquisition costs                 0  
Payments to acquire businesses, gross     $ 62,800           62,800  
Business combination consideration transferred                 62,800  
Lofficiel [Member] | AMTD Idea Group [Member]                    
Business Acquisition [Line Items]                    
Revenues       $ 177,000            
Net income (loss) attributable to parent       $ 159,000            
The Art Newspaper SA [Member]                    
Business Acquisition [Line Items]                    
Business acquisition equity interests issued or issuable number of shares issued | shares             8,688,525 8,688,525    
Net income (loss) attributable to parent             $ 45      
Business combination, bargain purchase, gain recognized, amount             4,469      
Business combination, acquired receivables, gross contractual amount             975      
Business combination, separately recognized transactions, additional disclosures, acquisition costs             0   $ 0  
Payments to acquire businesses, gross             2,540 € 2,888,888    
Revenue from business combination             2,000      
Business combination consideration transferred             $ 16,831      
The Art Newspaper SA [Member] | AMTD Idea Group [Member]                    
Business Acquisition [Line Items]                    
Revenues   $ 135,000                
Net income (loss) attributable to parent   $ 152,400                
The Art Newspaper SA [Member] | AMTD Digital [Member]                    
Business Acquisition [Line Items]                    
Business acquisition percentage of voting interests acquired           82.70%        
Business acquisition equity interests issued or issuable number of shares issued | shares             380,065 380,065    
Fair value, investments, entities that calculate net asset value per share, percent equity securities           14.40%        
Business acquisition share price | $ / shares           $ 8.38        
Business combination, consideration transferred, equity interests issued and issuable           $ 993,000        
The Art Newspaper SA [Member] | AMTD Digital [Member] | Capital Reserve [Member]                    
Business Acquisition [Line Items]                    
Stock issued during period value purchase of assets           $ 774,197