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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, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about intangible assets [line items]        
Beginning balance $ 30,897,700      
Additions 1,350,908 $ 45,166 $ 537,659 $ 277,825
Amortization expense 3,576,606 119,579 2,402,450 457,666
Ending balance 29,024,392 970,391 30,897,700  
Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 36,988,694 1,236,666 5,190,328 5,174,700
Additions 1,350,908 45,166 537,659 277,825
Disposals or derecognization (2,045,396) (68,385) (99,589) (212,317)
Acquisition through business combinations 752,548 25,161 31,507,668  
Effect of foreign currency exchange differences (52,879) (1,768) 4,969 (49,880)
Ending balance 36,993,875 1,236,840 36,988,694 5,190,328
Cost [member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 37,141,035 1,241,759    
Ending balance     37,141,035  
Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance (152,341) (5,093)    
Ending balance     (152,341)  
Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 6,150,661 205,639 3,783,463 3,557,439
Amortization expense 3,576,606 119,579 2,402,450 457,666
Disposals or derecognization (2,038,462) (68,153) (99,433) (196,224)
Acquisition through business combinations 321,187 10,739 153,282  
Effect of foreign currency exchange differences (40,509) (1,355) 3,573 (35,418)
Ending balance 7,969,483 266,449 6,150,661 3,783,463
Accumulated depreciation and amortization [Member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 6,243,335 208,738    
Ending balance     6,243,335  
Accumulated depreciation and amortization [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance (92,674) (3,099)    
Ending balance     (92,674)  
Customer relationships [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 10,366,797      
Ending balance 9,333,333 312,047 10,366,797  
Customer relationships [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 11,915,636 398,383 915,636 915,636
Disposals or derecognization (915,635) (30,613)    
Acquisition through business combinations     11,000,000  
Ending balance 11,000,001 367,770 11,915,636 915,636
Customer relationships [Member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 11,915,636 398,383    
Ending balance     11,915,636  
Customer relationships [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 1,548,839 51,783 801,860 721,547
Amortization expense 1,033,464 34,553 746,979 80,313
Disposals or derecognization (915,635) (30,613)    
Ending balance 1,666,668 55,723 1,548,839 801,860
Customer relationships [Member] | Accumulated depreciation and amortization [Member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 1,548,839 51,783    
Ending balance     1,548,839  
Computer software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 1,159,682      
Ending balance 1,929,539 64,511 1,159,682  
Computer software [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 4,401,045 147,143 3,686,452 3,552,229
Additions 1,358,533 45,421 528,883 265,497
Disposals or derecognization (1,123,446) (37,561) (95,358) (83,595)
Acquisition through business combinations 19,944 667 274,868  
Effect of foreign currency exchange differences (49,198) (1,645) 6,200 (47,679)
Ending balance 4,606,878 154,025 4,401,045 3,686,452
Computer software [Member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 4,401,045 147,143    
Ending balance     4,401,045  
Computer software [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 3,241,363 108,371 2,822,121 2,608,702
Amortization expense 583,300 19,502 373,536 316,580
Disposals or derecognization (1,116,512) (37,329) (95,202) (72,481)
Acquisition through business combinations 7,765 260 137,799  
Effect of foreign currency exchange differences (38,577) (1,290) 3,109 (30,680)
Ending balance 2,677,339 89,514 3,241,363 2,822,121
Computer software [Member] | Accumulated depreciation and amortization [Member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 3,241,363 108,371    
Ending balance     3,241,363  
Patents and acquired specific technology [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 19,255,669      
Ending balance 17,718,523 592,395 19,255,669  
Patents and acquired specific technology [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 20,588,356 688,343 389,486 514,443
Disposals or derecognization     (231) (123,744)
Acquisition through business combinations 732,604 24,494 20,200,000  
Effect of foreign currency exchange differences (2,264) (76) (899) (1,213)
Ending balance 21,318,696 712,761 20,588,356 389,486
Patents and acquired specific technology [Member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 20,588,356 688,343    
Ending balance     20,588,356  
Patents and acquired specific technology [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 1,332,687 44,557 70,084 155,216
Amortization expense 1,955,703 65,386 1,263,309 43,493
Disposals or derecognization     (231) (123,743)
Acquisition through business combinations 313,422 10,479    
Effect of foreign currency exchange differences (1,639) (55) (475) (4,882)
Ending balance 3,600,173 120,367 1,332,687 70,084
Patents and acquired specific technology [Member] | Accumulated depreciation and amortization [Member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 1,332,687 44,557    
Ending balance     1,332,687  
Others [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 115,552      
Ending balance 42,997 1,438 115,552  
Others [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 83,657 2,797 198,754 192,392
Additions (7,625) (255) 8,776 12,328
Disposals or derecognization (6,315) (211) (4,000) (4,978)
Acquisition through business combinations     32,800  
Effect of foreign currency exchange differences (1,417) (47) (332) (988)
Ending balance 68,300 2,284 83,657 198,754
Others [Member] | Cost [member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 235,998 7,890    
Ending balance     235,998  
Others [Member] | Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance (152,341) (5,093)    
Ending balance     (152,341)  
Others [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 27,772 928 89,398 71,974
Amortization expense 4,139 138 18,626 17,280
Disposals or derecognization (6,315) (211) (4,000)  
Acquisition through business combinations     15,483  
Effect of foreign currency exchange differences (293) (10) 939 144
Ending balance 25,303 845 27,772 $ 89,398
Others [Member] | Accumulated depreciation and amortization [Member] | Previously stated [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 120,446 4,027    
Ending balance     120,446  
Others [Member] | Accumulated depreciation and amortization [Member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance $ (92,674) $ (3,099)    
Ending balance     $ (92,674)