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Income Tax - Summary of Movements of Deferred Tax Assets and Deferred Tax Liabilities (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 temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 $ (698,356) $ (23,349) $ (959,666) $ (319,625)
Recognized in Profit or Loss (341,756) (11,426) (432,442) (555,646)
Recognized in Other Comprehensive Income (3,816) (128) 126,101 (51,217)
Recognized in Equity 1,404 47 (1,099) 262
Exchange Differences (62,113) (2,076) 115,153 (33,440)
Acquisitions Through Business Combinations 40,104 1,341 550,955  
Balance at December 31 (1,064,533) (35,591) (698,356) (959,666)
Property, plant and equipment [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (4,546,314) (152,000) (3,879,066) (3,758,847)
Recognized in Profit or Loss (80,593) (2,694) (600,229) (101,576)
Exchange Differences (17,949) (600) (21,146) (18,643)
Acquisitions Through Business Combinations (16,917) (566) (45,873)  
Balance at December 31 (4,661,773) (155,860) (4,546,314) (3,879,066)
Defined benefit obligation [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 1,064,824 35,601 780,240 873,484
Recognized in Profit or Loss (57,746) (1,931) (131,687) (26,736)
Recognized in Other Comprehensive Income 74,308 2,484 126,101 (51,217)
Exchange Differences (2,803) (94) 27,884 (15,291)
Acquisitions Through Business Combinations     262,286  
Balance at December 31 1,078,583 36,060 1,064,824 780,240
Mandatorily at fair value through profit or loss [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 207,021 6,921 (104,903) (21,363)
Recognized in Profit or Loss 43,285 1,447 284,659 (86,342)
Exchange Differences 9   (137) 2,802
Acquisitions Through Business Combinations     27,402  
Balance at December 31 250,315 8,368 207,021 (104,903)
Other temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 1,272,672 42,550 1,028,409 1,079,824
Recognized in Profit or Loss 6,148 205 (26,147) (22,748)
Recognized in Other Comprehensive Income (78,124) (2,612)    
Recognized in Equity 1,404 47 (1,099) 262
Exchange Differences (21,763) (726) 74,327 (28,929)
Acquisitions Through Business Combinations 8,184 274 294,540  
Balance at December 31 1,188,521 39,738 1,272,672 1,028,409
Temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (2,001,797) (66,928) (2,175,320) (1,826,902)
Recognized in Profit or Loss (88,906) (2,973) (473,404) (237,402)
Recognized in Other Comprehensive Income (3,816) (128) 126,101 (51,217)
Recognized in Equity 1,404 47 (1,099) 262
Exchange Differences (42,506) (1,420) 80,928 (60,061)
Acquisitions Through Business Combinations (8,733) (292) 538,355  
Balance at December 31 (2,141,354) (71,694) (2,001,797) (2,175,320)
Unused tax losses [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 672,275 22,477 681,441 1,124,541
Recognized in Profit or Loss (166,128) (5,554) (50,059) (456,246)
Exchange Differences (12,203) (408) 28,293 13,146
Acquisitions Through Business Combinations 48,837 1,633 12,600  
Balance at December 31 542,781 18,148 672,275 681,441
Unused tax credits [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 631,166 21,102 534,213 382,736
Recognized in Profit or Loss (86,722) (2,899) 91,021 138,002
Exchange Differences (7,404) (248) 5,932 13,475
Balance at December 31 $ 537,040 $ 17,955 631,166 $ 534,213
Adjustments arising from initial application [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss     (97,358)  
Adjustments arising from initial application [member] | Other temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss     (97,358)  
Adjustments arising from initial application [member] | Temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss     $ (97,358)