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Financial Instruments - Summary of Financial Assets Measured at Level 3 Fair Value (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 fair value measurement of assets [line items]        
Beginning Balance $ 667,392,735      
Net increase (decrease) in trade receivables (14,331,791) $ (437,078) $ 15,868,810 $ 754,156
Ending Balance 741,060,069 22,600,186 667,392,735  
Available-for-sale [member] | Level 3 of fair value hierarchy [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 9,906,607 302,123 9,565,566 10,311,050
Recognized in profit or loss (343,820) (10,486) (83,352) 100,739
Recognized in other comprehensive income (Included in unrealized losses on financial assets at FVTOCI) (26,543) (810) 199,107 (383,608)
Recognized in other comprehensive income (Effects of foreign currency exchange) 476,406 14,529 6,658 200,973
Net increase (decrease) in trade receivables 2,062,310 62,894 6,012,850 3,655,963
Trade receivables factored (1,167,287) (35,599) (5,778,078) (4,345,711)
Transfers to Level 1 (53,360) (1,627)    
Purchases 12,691,798 387,063 883,774 372,341
Disposals (324,813) (9,905) (870,346) (346,181)
Ending Balance 23,221,298 708,182 9,906,607 9,565,566
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | Disposal of subsidiaries [member]        
Disclosure of fair value measurement of assets [line items]        
Disposals     (29,572)  
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL equity instrument [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 2,543,975 77,584 2,666,264 2,300,899
Recognized in profit or loss (352,120) (10,739) (83,239) 100,134
Recognized in other comprehensive income (Effects of foreign currency exchange) 137,556 4,195 5,053 195,415
Purchases 177,813 5,423 637,767 338,016
Disposals (140,358) (4,280) (681,870) (268,200)
Ending Balance 2,366,866 72,183 2,543,975 2,666,264
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL debt instrument [member]        
Disclosure of fair value measurement of assets [line items]        
Recognized in profit or loss       605
Net increase (decrease) in trade receivables 1,167,287 35,599 5,778,078 4,330,075
Trade receivables factored (1,167,287) (35,599) (5,778,078) (4,330,075)
Purchases       14,325
Disposals       (14,930)
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL hybrid instruments [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 61,410 1,873    
Recognized in profit or loss 8,300 253 (113)  
Recognized in other comprehensive income (Effects of foreign currency exchange) 2,270 69    
Purchases 363,225 11,077 61,523  
Ending Balance 435,205 13,272 61,410  
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI equity instruments [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 620,831 18,933 436,876 841,231
Recognized in other comprehensive income (Included in unrealized losses on financial assets at FVTOCI) (9,397) (287) 215,914 (366,862)
Recognized in other comprehensive income (Effects of foreign currency exchange) 336,580 10,265 1,605 5,558
Transfers to Level 1 (53,360) (1,627)    
Purchases 12,150,760 370,563 184,484 20,000
Disposals (184,455) (5,625) (188,476) (63,051)
Ending Balance 12,860,959 392,222 620,831 436,876
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI equity instruments [member] | Disposal of subsidiaries [member]        
Disclosure of fair value measurement of assets [line items]        
Disposals     (29,572)  
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVOCI debt instruments [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 6,680,391 203,733 6,462,426 7,168,920
Recognized in other comprehensive income (Included in unrealized losses on financial assets at FVTOCI) (17,146) (523) (16,807) (16,746)
Net increase (decrease) in trade receivables 895,023 27,295 234,772 (674,112)
Trade receivables factored       (15,636)
Ending Balance $ 7,558,268 $ 230,505 $ 6,680,391 $ 6,462,426