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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, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 $ (1,064,533) $ (37,910) $ (698,356) $ (959,666)
Recognized in Profit or Loss (100,879) (3,592) (341,756) (432,442)
Recognized in Other Comprehensive Income (122,901) (4,377) (3,816) 126,101
Recognized in Equity (1,159) (41) 1,404 (1,099)
Exchange Differences (20,950) (747) (62,113) 115,153
Acquisitions Through Business Combinations 533,982 19,016 40,104 550,955
Disposal of Subsidiary (297,421) (10,592)    
Balance at December 31 (1,073,860) (38,243) (1,064,533) (698,356)
Property, plant and equipment [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (4,661,773) (166,018) (4,546,314) (3,879,066)
Recognized in Profit or Loss (422,833) (15,058) (80,593) (600,229)
Exchange Differences 43,364 1,544 (17,949) (21,146)
Acquisitions Through Business Combinations 21,875 779 (16,917) (45,873)
Disposal of Subsidiary (13,982) (498)    
Balance at December 31 (5,033,349) (179,251) (4,661,773) (4,546,314)
Defined benefit obligation [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 1,078,583 38,411 1,064,824 780,240
Recognized in Profit or Loss (36,633) (1,305) (57,746) (131,687)
Recognized in Other Comprehensive Income 114,559 4,080 74,308 126,101
Exchange Differences 1,005 36 (2,803) 27,884
Acquisitions Through Business Combinations 212,941 7,583   262,286
Balance at December 31 1,370,455 48,805 1,078,583 1,064,824
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 1 250,315 8,914 207,021 (104,903)
Recognized in Profit or Loss (135,103) (4,811) 43,285 284,659
Exchange Differences (74) (3) 9 (137)
Acquisitions Through Business Combinations 2,085 74   27,402
Disposal of Subsidiary (11,281) (402)    
Balance at December 31 105,942 3,772 250,315 207,021
Other temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 1,188,521 42,328 1,272,672 1,028,409
Recognized in Profit or Loss 624,442 22,238 6,148 (26,147)
Recognized in Other Comprehensive Income (237,460) (8,457) (78,124)  
Recognized in Equity (1,159) (41) 1,404 (1,099)
Exchange Differences (42,771) (1,523) (21,763) 74,327
Acquisitions Through Business Combinations 114,036 4,061 8,184 294,540
Disposal of Subsidiary (119,564) (4,258)    
Balance at December 31 1,526,045 54,348 1,188,521 1,272,672
Temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (2,144,354) (76,365) (2,001,797) (2,175,320)
Recognized in Profit or Loss 29,873 1,064 (88,906) (473,404)
Recognized in Other Comprehensive Income (122,901) (4,377) (3,816) 126,101
Recognized in Equity (1,159) (41) 1,404 (1,099)
Exchange Differences 1,524 54 (42,506) 80,928
Acquisitions Through Business Combinations 350,937 12,497 (8,733) 538,355
Disposal of Subsidiary (144,827) (5,158)    
Balance at December 31 (2,030,907) (72,326) (2,144,354) (2,001,797)
Unused tax losses [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 542,781 19,330 672,275 681,441
Recognized in Profit or Loss (44,651) (1,590) (166,128) (50,059)
Exchange Differences (915) (33) (12,203) 28,293
Acquisitions Through Business Combinations 183,045 6,519 48,837 12,600
Disposal of Subsidiary (152,594) (5,434)    
Balance at December 31 527,666 18,792 542,781 672,275
Unused tax credits [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 537,040 19,125 631,166 534,213
Recognized in Profit or Loss (86,100) (3,066) (86,722) 91,021
Exchange Differences (21,559) (768) (7,404) 5,932
Balance at December 31 429,381 $ 15,291 $ 537,040 631,166
Adjustments arising from initial application [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss $ (100,878)     (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)