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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about intangible assets [line items]        
Beginning balance $ 24,563,707      
Amortization expense 3,931,079 $ 127,923 $ 4,054,120 $ 3,733,377
Ending balance 21,177,708 689,154 24,563,707  
Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 40,205,066 1,308,333 40,355,771 36,993,875
Additions 491,868 16,005 1,233,019 982,655
Disposals or derecognition (50,313) (1,637) (324,321) (70,007)
Disposal of subsidiaries     (801,642) (38,125)
Acquisition through business combinations     622 2,567,342
Effect of foreign currency exchange differences 179,347 5,837 (258,383) (79,969)
Ending balance 40,825,968 1,328,538 40,205,066 40,355,771
Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 15,641,359 508,994 12,644,000 7,969,483
Amortization expense 3,931,079 127,923 4,054,120 3,733,377
Impairment losses recognized 715 23    
Disposals or derecognition (40,009) (1,302) (310,285) (52,389)
Disposal of subsidiaries     (634,693) (10,688)
Acquisition through business combinations     222 1,026,187
Effect of foreign currency exchange differences 115,116 3,746 (112,005) (21,970)
Ending balance 19,648,260 639,384 15,641,359 12,644,000
Customer relationships [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 7,990,956      
Ending balance 6,974,365 226,956 7,990,956  
Customer relationships [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 11,704,605 380,885 11,890,283 11,000,001
Disposals or derecognition 0 0 (102,637) 0
Acquisition through business combinations       885,565
Effect of foreign currency exchange differences 31,576 1,028 (83,041) 4,717
Ending balance 11,736,181 381,913 11,704,605 11,890,283
Customer relationships [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 3,713,649 120,848 2,769,983 1,666,668
Amortization expense 1,043,852 33,968 1,049,759 1,000,000
Impairment losses recognized 0 0    
Disposals or derecognition 0 0 (102,637) 0
Acquisition through business combinations       102,768
Effect of foreign currency exchange differences 4,315 141 (3,456) 547
Ending balance 4,761,816 154,957 3,713,649 2,769,983
Computer software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 2,779,723      
Ending balance 2,310,815 75,197 2,779,723  
Computer software [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 7,051,694 229,473 6,966,449 4,606,878
Additions 459,954 14,967 1,193,060 951,439
Disposals or derecognition (37,442) (1,218) (150,670) (55,413)
Disposal of subsidiaries     (789,998) (38,125)
Acquisition through business combinations     622 1,567,508
Effect of foreign currency exchange differences 141,903 4,617 (167,769) (65,838)
Ending balance 7,616,109 247,839 7,051,694 6,966,449
Computer software [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 4,271,971 139,017 4,170,576 2,677,339
Amortization expense 957,708 31,165 971,190 729,330
Impairment losses recognized 715 23    
Disposals or derecognition (31,456) (1,024) (139,907) (47,345)
Disposal of subsidiaries     (626,338) (10,688)
Acquisition through business combinations     222 843,746
Effect of foreign currency exchange differences 106,356 3,461 (103,772) (21,806)
Ending balance 5,305,294 172,642 4,271,971 4,170,576
Patents and acquired specific technology [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 13,730,404      
Ending balance 11,829,167 384,939 13,730,404  
Patents and acquired specific technology [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 21,315,241 693,630 21,319,179 21,318,696
Additions 500 16 2,000 171
Disposals or derecognition 0 0   0
Disposal of subsidiaries     (5,401)  
Effect of foreign currency exchange differences 1,611 53 (537) 312
Ending balance 21,317,352 693,699 21,315,241 21,319,179
Patents and acquired specific technology [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 7,584,837 246,822 5,598,966 3,600,173
Amortization expense 1,901,835 61,889 1,991,641 1,998,554
Impairment losses recognized 0 0    
Disposals or derecognition 0 0   0
Disposal of subsidiaries     (5,288)  
Effect of foreign currency exchange differences 1,513 49 (482) 239
Ending balance 9,488,185 308,760 7,584,837 5,598,966
Others [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 62,624      
Ending balance 63,361 2,062 62,624  
Others [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 133,526 4,345 179,860 68,300
Additions 31,414 1,022 37,959 31,045
Disposals or derecognition (12,871) (419) (71,014) (14,594)
Disposal of subsidiaries     (6,243)  
Acquisition through business combinations       114,269
Effect of foreign currency exchange differences 4,257 139 (7,036) (19,160)
Ending balance 156,326 5,087 133,526 179,860
Others [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 70,902 2,307 104,475 25,303
Amortization expense 27,684 901 41,530 5,493
Impairment losses recognized 0 0    
Disposals or derecognition (8,553) (278) (67,741) (5,044)
Disposal of subsidiaries     (3,067)  
Acquisition through business combinations       79,673
Effect of foreign currency exchange differences 2,932 95 (4,295) (950)
Ending balance $ 92,965 $ 3,025 $ 70,902 $ 104,475