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Share-based Payment Arrangements - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Dec. 27, 2019
Sep. 30, 2020
shares
Nov. 30, 2019
shares
Dec. 31, 2021
TWD ($)
shares
$ / shares
Dec. 31, 2021
USD ($)
shares
$ / shares
Dec. 31, 2020
TWD ($)
shares
$ / shares
Dec. 31, 2019
TWD ($)
shares
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Compensation cost of employee share options       $ 699,211,000 $ 25,206,000 $ 955,575,000 $ 871,699,000  
Employee restricted stock awards plan [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Stock Issued during the period ,Restricted stock award ,shares       15,000,000 15,000,000      
Par value per share | (per share)       $ 10       $ 0.36
Fair value of the employee restricted stock award       $ 92.4 $ 3.33      
Exercise price, per share | $ / shares           $ 0    
USIE option plans [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Capital surplus decreased | $           $ 1,120,111,000 981,078,000  
Retained earnings decreased | $           392,447,000    
USISH option plans [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Capital surplus decreased       $ 58,448,000   $ 1,010,219,000 $ 105,785,000 $ 2,107,000
Options granted       0 0 1,140,000 17,167,000  
Number of equity instruments other than options granted       281,000 281,000 672,000 6,156,000  
USISH option plans [member] | Share Option [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Options granted     17,167,000          
USISH option plans [member] | Bottom of range [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans     3.0          
USISH option plans [member] | Weighted average [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans     4.0          
ASE Inc. option plans [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Share option to purchase of ordinary shares       0.5 0.5      
Weighted average exercise price of share options | $ / shares             $ 69.3  
The Company Option Plans [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans       10 years 10 years      
Percentage of cash dividend per ordinary share exceeds market price       1.50% 1.50%      
Weighted average exercise price of share options | (per share)       $ 108.8 $ 3.9 $ 68.5    
USISH core employees stock ownership plan [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Options granted     6,156,000          
Share based compensation number of additional shares to be granted     6,403,000          
USISH core employees stock ownership plan [Member] | Phase One [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans 4.5 years              
USISH core employees stock ownership plan [Member] | Phase Two [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans 3.5 years              
USISH core employees stock ownership plan [Member] | Phase Three [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans 2.5 years              
USISH second share option plan [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Number of shares granted   1,140,000            
USISH second share option plan [member] | Phase One [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans   1.2 years            
USISH second share option plan [member] | Phase Two [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans   2.2 years            
USISH second share option plan [member] | Phase Three [Member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans   3.2 years            
USISH second share option plan [member] | Bottom of range [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans   2.2            
USISH second share option plan [member] | Weighted average [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans   3.2            
USISH second share option plan [member] | Top of range [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans   4.2 years            
USISH restricted share plan [member]                
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                
Valid term of share option plans   2 years            
Number of equity instruments other than options granted   425,000            
Period of lock in of ordinary shares to be issued upon satisfaction of performance conditions   1 year 3 months 18 days