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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, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of detailed information about intangible assets [line items]        
Beginning balance $ 17,820,133      
Amortization expense 3,820,014 $ 116,499 $ 3,906,483 $ 3,931,079
Ending balance 15,692,350 478,571 17,820,133  
Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 40,457,546 1,233,838 40,825,968 40,205,066
Additions 1,670,252 50,938 527,786 491,868
Disposals or derecognition (335,661) (10,237) (936,920) (50,313)
Acquisition through business combinations 39,828 1,215    
Effect of foreign currency exchange differences 123,671 3,772 40,712 179,347
Ending balance 41,955,636 1,279,526 40,457,546 40,825,968
Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 22,637,413 690,376 19,648,260 15,641,359
Amortization expense 3,820,014 116,499 3,906,483 3,931,079
Impairment losses recognized       715
Disposals or derecognition (328,214) (10,009) (923,567) (40,009)
Acquisition through business combinations 38,515 1,175    
Effect of foreign currency exchange differences 95,558 2,914 6,237 115,116
Ending balance 26,263,286 800,955 22,637,413 19,648,260
Customer relationships [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 5,949,623      
Ending balance 4,904,110 149,561 5,949,623  
Customer relationships [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 11,762,561 358,724 11,736,181 11,704,605
Disposals or derecognition     0 0
Effect of foreign currency exchange differences 2,951 90 26,380 31,576
Ending balance 11,765,512 358,814 11,762,561 11,736,181
Customer relationships [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 5,812,938 177,278 4,761,816 3,713,649
Amortization expense 1,048,694 31,982 1,047,282 1,043,852
Disposals or derecognition     0 0
Effect of foreign currency exchange differences (230) (7) 3,840 4,315
Ending balance 6,861,402 209,253 5,812,938 4,761,816
Computer software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 1,878,509      
Ending balance 2,612,829 79,684 1,878,509  
Computer software [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 7,260,393 221,421 7,616,109 7,051,694
Additions 1,597,759 48,727 537,261 459,954
Disposals or derecognition (325,476) (9,926) (905,947) (37,442)
Acquisition through business combinations 39,828 1,215    
Effect of foreign currency exchange differences 121,122 3,694 12,970 141,903
Ending balance 8,693,626 265,131 7,260,393 7,616,109
Computer software [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 5,381,884 164,132 5,305,294 4,271,971
Amortization expense 886,727 27,042 970,413 957,708
Impairment losses recognized       715
Disposals or derecognition (319,368) (9,739) (894,767) (31,456)
Acquisition through business combinations 38,515 1,175    
Effect of foreign currency exchange differences 93,039 2,837 944 106,356
Ending balance 6,080,797 185,447 5,381,884 5,305,294
Patents and acquired specific technology [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 9,948,539      
Ending balance 8,069,574 246,098 9,948,539  
Patents and acquired specific technology [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 21,317,895 650,134 21,317,352 21,315,241
Additions     1,350 500
Disposals or derecognition (8,846) (270)    
Effect of foreign currency exchange differences 2,451 75 (807) 1,611
Ending balance 21,311,500 649,939 21,317,895 21,317,352
Patents and acquired specific technology [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 11,369,356 346,733 9,488,185 7,584,837
Amortization expense 1,878,965 57,303 1,881,980 1,901,835
Disposals or derecognition (8,846) (270) 0  
Effect of foreign currency exchange differences 2,451 75 (809) 1,513
Ending balance 13,241,926 403,841 11,369,356 9,488,185
Others [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 43,462      
Ending balance 105,837 3,228 43,462  
Others [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 116,697 3,559 156,326 133,526
Additions 72,493 2,211 (10,825) 31,414
Disposals or derecognition (1,339) (41) (30,973) (12,871)
Effect of foreign currency exchange differences (2,853) (87) 2,169 4,257
Ending balance 184,998 5,642 116,697 156,326
Others [Member] | Accumulated depreciation and impairment [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 73,235 2,233 92,965 70,902
Amortization expense 5,628 172 6,808 27,684
Disposals or derecognition     (28,800) (8,553)
Effect of foreign currency exchange differences 298 9 2,262 2,932
Ending balance $ 79,161 $ 2,414 $ 73,235 $ 92,965