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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of fair value measurement of assets [line items]        
Beginning Balance $ 584,152,644      
Net increase in trade receivables (27,957,812) $ (1,007,852) $ (9,396,304) $ 995,839
Exercise of call option (2,727,915) (98,339) (1,934,530) (1,149,227)
Ending Balance 673,265,899 24,270,582 584,152,644  
Available-for-sale [member] | Level 3 of fair value hierarchy [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 4,265,531 153,767 4,806,179 2,072,446
Recognized in profit or loss 131,276 4,732 (17,941) 3,431
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) 193,448 6,974 (151,992) (218,173)
Recognized in other comprehensive income (effects of foreign currency exchange) (84,122) (3,033) (31,017) (20,063)
Net increase in trade receivables 18,210,321 656,464 6,005,816 3,171,205
Trade receivables factoring (purchases) (12,744,272) (459,418) (7,409,093) (1,141,515)
Purchases 491,292 17,711 1,152,402 951,513
Disposals (122,666) (4,422) (450,625) (12,665)
Exercise of call option     (25,988)  
Reclassify (29,758) (1,073)    
Acquisition through business combinations     387,790  
Ending Balance 10,311,050 371,702 4,265,531 4,806,179
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | Adjusted [Member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 4,265,531      
Ending Balance     4,265,531  
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 1,897,984 68,421 1,005,714 475,123
Recognized in profit or loss 131,276 4,732 (17,941) 3,431
Recognized in other comprehensive income (effects of foreign currency exchange) (79,614) (2,870) (15,455) (14,368)
Purchases 459,046 16,548 893,234 541,528
Disposals (107,793) (3,886) (329,370)  
Exercise of call option     (25,988)  
Acquisition through business combinations     387,790  
Ending Balance 2,300,899 82,945 1,897,984 1,005,714
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL equity instrument [member] | Adjusted [Member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 1,897,984      
Ending Balance     1,897,984  
Available-for-sale [member] | Level 3 of fair value hierarchy [member] | FVTPL debt instrument [member]        
Disclosure of fair value measurement of assets [line items]        
Beginning Balance 0 0 0  
Net increase in trade receivables 3,269,782 117,872 370,110  
Trade receivables factoring (purchases) (3,269,782) (117,872) (370,110)  
Ending Balance 0 0 0 0
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 728,398 26,257 755,903 580,399
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) 129,726 4,677 (149,856) (216,121)
Recognized in other comprehensive income (effects of foreign currency exchange) (4,508) (163) (15,562) (5,695)
Purchases 32,246 1,163 259,168 409,985
Disposals (14,873) (536) (121,255) (12,665)
Reclassify (29,758) (1,073)    
Ending Balance 841,231 30,325 728,398 755,903
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 1,639,149 59,089 3,044,562 1,016,924
Recognized in other comprehensive income (included in unrealized losses on financial assets at FVTOCI) 63,722 2,297 (2,136) (2,052)
Net increase in trade receivables 14,940,539 538,592 5,635,706 3,171,205
Trade receivables factoring (purchases) (9,474,490) (341,546) (7,038,983) (1,141,515)
Ending Balance $ 7,168,920 $ 258,432 $ 1,639,149 $ 3,044,562