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Other Intangible Assets - Summary of Carrying Amounts of Each Class of Other Intangible Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about intangible assets [line items]        
Beginning balance $ 27,711,771      
Additions 1,069,866 $ 38,568 $ 982,655 $ 1,350,908
Amortization expense 4,054,120 146,147 3,733,377 3,576,606
Ending balance 24,563,707 885,498 27,711,771  
Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 40,355,771 1,454,787 36,993,875 36,988,694
Additions 1,233,019 44,449 982,655 1,350,908
Disposals or derecognization (324,321) (11,692) (70,007) (2,045,396)
Disposal of subsidiaries (801,642) (28,899) (38,125)  
Acquisition through business combinations 622 23 2,567,342 752,548
Effect of foreign currency exchange differences (258,383) (9,315) (79,969) (52,879)
Ending balance 40,205,066 1,449,353 40,355,771 36,993,875
Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 12,644,000 455,803 7,969,483 6,150,661
Amortization expense 4,054,120 146,147 3,733,377 3,576,606
Disposals or derecognization (310,285) (11,185) (52,389) (2,038,462)
Disposal of subsidiaries (634,693) (22,880) (10,688)  
Acquisition through business combinations 222 8 1,026,187 321,187
Effect of foreign currency exchange differences (112,005) (4,038) (21,970) (40,509)
Ending balance 15,641,359 563,855 12,644,000 7,969,483
Customer relationships [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 9,120,300      
Ending balance 7,990,956 288,066 9,120,300  
Customer relationships [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 11,890,283 428,633 11,000,001 11,915,636
Disposals or derecognization (102,637) (3,700)   (915,635)
Acquisition through business combinations     885,565  
Effect of foreign currency exchange differences (83,041) (2,994) 4,717  
Ending balance 11,704,605 421,939 11,890,283 11,000,001
Customer relationships [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 2,769,983 99,855 1,666,668 1,548,839
Amortization expense 1,049,759 37,843 1,000,000 1,033,464
Disposals or derecognization (102,637) (3,700)   (915,635)
Acquisition through business combinations     102,768  
Effect of foreign currency exchange differences (3,456) (125) 547  
Ending balance 3,713,649 133,873 2,769,983 1,666,668
Computer software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 2,795,873      
Ending balance 2,779,723 100,206 2,795,873  
Computer software [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 6,966,449 251,134 4,606,878 4,401,045
Additions 1,193,060 43,009 951,439 1,358,533
Disposals or derecognization (150,670) (5,432) (55,413) (1,123,446)
Disposal of subsidiaries (789,998) (28,479) (38,125)  
Acquisition through business combinations 622 23 1,567,508 19,944
Effect of foreign currency exchange differences (167,769) (6,048) (65,838) (49,198)
Ending balance 7,051,694 254,207 6,966,449 4,606,878
Computer software [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 4,170,576 150,345 2,677,339 3,241,363
Amortization expense 971,190 35,010 729,330 583,300
Disposals or derecognization (139,907) (5,043) (47,345) (1,116,512)
Disposal of subsidiaries (626,338) (22,579) (10,688)  
Acquisition through business combinations 222 8 843,746 7,765
Effect of foreign currency exchange differences (103,772) (3,741) (21,806) (38,577)
Ending balance 4,271,971 154,000 4,170,576 2,677,339
Patents and acquired specific technology [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 15,720,213      
Ending balance 13,730,404 494,968 15,720,213  
Patents and acquired specific technology [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 21,319,179 768,536 21,318,696 20,588,356
Additions 2,000 72 171  
Disposal of subsidiaries (5,401) (195)    
Acquisition through business combinations       732,604
Effect of foreign currency exchange differences (537) (19) 312 (2,264)
Ending balance 21,315,241 768,394 21,319,179 21,318,696
Patents and acquired specific technology [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 5,598,966 201,837 3,600,173 1,332,687
Amortization expense 1,991,641 71,797 1,998,554 1,955,703
Disposal of subsidiaries (5,288) (191)    
Acquisition through business combinations       313,422
Effect of foreign currency exchange differences (482) (17) 239 (1,639)
Ending balance 7,584,837 273,426 5,598,966 3,600,173
Others [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 75,385      
Ending balance 62,624 2,258 75,385  
Others [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 179,860 6,484 68,300 83,657
Additions 37,959 1,368 31,045 7,625
Disposals or derecognization (71,014) (2,560) (14,594) (6,315)
Disposal of subsidiaries (6,243) (225)    
Acquisition through business combinations     114,269  
Effect of foreign currency exchange differences (7,036) (254) (19,160) (1,417)
Ending balance 133,526 4,813 179,860 68,300
Others [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 104,475 3,766 25,303 27,772
Amortization expense 41,530 1,497 5,493 4,139
Disposals or derecognization (67,741) (2,442) (5,044) (6,315)
Disposal of subsidiaries (3,067) (110)    
Acquisition through business combinations     79,673  
Effect of foreign currency exchange differences (4,295) (155) (950) (293)
Ending balance $ 70,902 $ 2,556 $ 104,475 $ 25,303