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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, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of detailed information about intangible assets [line items]        
Beginning balance   $ 1,406,865    
Additions $ 17,565 537,659 $ 277,825 $ 675,144
Amortization expense 78,486 2,402,450 457,666 508,823
Ending balance 1,009,399 30,897,700 1,406,865  
Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 169,563 5,190,328 5,174,700 4,601,416
Additions 17,565 537,659 277,825 675,144
Disposals or derecognization (3,254) (99,589) (212,317) (122,946)
Reclassification       786
Acquisition through business combinations 1,029,326 31,507,668   105,509
Effect of foreign currency exchange differences 162 4,969 (49,880) (85,209)
Ending balance 1,213,362 37,141,035 5,190,328 5,174,700
Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 123,603 3,783,463 3,557,439 3,219,323
Amortization expense 78,485 2,402,450 457,666 508,823
Disposals or derecognization (3,249) (99,433) (196,224) (101,174)
Reclassification       786
Acquisition through business combinations 5,008 153,282   506
Effect of foreign currency exchange differences 116 3,573 (35,418) (70,825)
Ending balance 203,963 6,243,335 3,783,463 3,557,439
Customer relationships [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance   113,776    
Ending balance 338,673 10,366,797 113,776  
Customer relationships [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 29,913 915,636 915,636 915,636
Disposals or derecognization       (41,099)
Acquisition through business combinations 359,359 11,000,000   41,099
Ending balance 389,272 11,915,636 915,636 915,636
Customer relationships [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 26,196 801,860 721,547 641,234
Amortization expense 24,403 746,979 80,313 121,412
Disposals or derecognization       (41,099)
Ending balance 50,599 1,548,839 801,860 721,547
Computer software [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance   864,331    
Ending balance 37,886 1,159,682 864,331  
Computer software [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 120,433 3,686,452 3,552,229 3,338,360
Additions 17,278 528,883 265,497 372,188
Disposals or derecognization (3,115) (95,358) (83,595) (80,537)
Acquisition through business combinations 8,980 274,868    
Effect of foreign currency exchange differences 202 6,200 (47,679) (77,782)
Ending balance 143,778 4,401,045 3,686,452 3,552,229
Computer software [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 92,196 2,822,121 2,608,702 2,385,038
Amortization expense 12,203 373,536 316,580 345,836
Disposals or derecognization (3,110) (95,202) (72,481) (58,765)
Acquisition through business combinations 4,502 137,799    
Effect of foreign currency exchange differences 101 3,109 (30,680) (63,407)
Ending balance 105,892 3,241,363 2,822,121 2,608,702
Patents and acquired specific technology [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance   319,402    
Ending balance 629,065 19,255,669 319,402  
Patents and acquired specific technology [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 12,724 389,486 514,443 154,082
Additions       301,351
Disposals or derecognization (8) (231) (123,744) (1,310)
Reclassification       786
Acquisition through business combinations 659,915 20,200,000   64,380
Effect of foreign currency exchange differences (29) (899) (1,213) (4,846)
Ending balance 672,602 20,588,356 389,486 514,443
Patents and acquired specific technology [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 2,290 70,084 155,216 138,386
Amortization expense 41,271 1,263,309 43,493 24,154
Disposals or derecognization (8) (231) (123,743) (1,310)
Reclassification       786
Acquisition through business combinations       483
Effect of foreign currency exchange differences (16) (475) (4,882) (7,283)
Ending balance 43,537 1,332,687 70,084 155,216
Others [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance   109,356    
Ending balance 3,775 115,552 109,356  
Others [Member] | Cost [member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 6,493 198,754 192,392 193,338
Additions 287 8,776 12,328 1,605
Disposals or derecognization (131) (4,000) (4,978)  
Acquisition through business combinations 1,072 32,800   30
Effect of foreign currency exchange differences (11) (332) (988) (2,581)
Ending balance 7,710 235,998 198,754 192,392
Others [Member] | Accumulated depreciation and amortization [Member]        
Disclosure of detailed information about intangible assets [line items]        
Beginning balance 2,921 89,398 71,974 54,665
Amortization expense 608 18,626 17,280 17,421
Disposals or derecognization (131) (4,000)    
Acquisition through business combinations 506 15,483   23
Effect of foreign currency exchange differences 31 939 144 (135)
Ending balance $ 3,935 $ 120,446 $ 89,398 $ 71,974