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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss $ 144,784 $ 5,219 $ (100,879) $ (341,756)
Recognized in Other Comprehensive Income (179,403) (6,467) (122,901) (3,816)
Recognized in Equity (9) 0 (1,159) 1,404
Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 5,477,373 197,455 4,707,704 5,108,357
Recognized in Profit or Loss 627,367 22,616 378,400 (466,954)
Recognized in Other Comprehensive Income (19,319) (696) 114,559 74,308
Recognized in Equity (7) 0 (999) 1,160
Exchange Differences (56,432) (2,035) (54,210) (72,379)
Acquisitions Through Business Combinations     630,135 63,212
Disposal of Subsidiary (659,972) (23,792) (298,216)  
Balance at December 31 5,369,010 193,548 5,477,373 4,707,704
Deferred tax liabilities [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 7,121,027 256,706 5,772,237 5,806,713
Recognized in Profit or Loss 482,583 17,397 479,278 (125,197)
Recognized in Other Comprehensive Income 160,084 5,771 237,460 78,124
Recognized in Equity 2 0 160 (244)
Exchange Differences 27,400 987 (30,241) (10,267)
Acquisitions Through Business Combinations     662,928 23,108
Disposal of Subsidiary (200,899) (7,242) (795)  
Balance at December 31 7,590,197 273,619 7,121,027 5,772,237
Property, plant and equipment [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 629,702 22,700 544,844 689,790
Recognized in Profit or Loss (186,443) (6,721) 4,632 (119,972)
Exchange Differences (7,178) (259) 12,435 (25,023)
Acquisitions Through Business Combinations     81,773 49
Disposal of Subsidiary (345,104) (12,441) (13,982)  
Balance at December 31 90,977 3,279 629,702 544,844
Property, plant and equipment [member] | Deferred tax liabilities [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 5,980,387 215,587 5,206,617 5,236,104
Recognized in Profit or Loss 165,628 5,971 427,465 (39,379)
Exchange Differences (42,437) (1,530) (29,248) (7,074)
Acquisitions Through Business Combinations     375,553 16,966
Disposal of Subsidiary (186,834) (6,735)    
Balance at December 31 5,916,744 213,293 5,980,387 5,206,617
Defined benefit obligation [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 1,370,455 49,404 1,078,583 1,064,824
Recognized in Profit or Loss (115,707) (4,171) (36,633) (57,746)
Recognized in Other Comprehensive Income (19,319) (696) 114,559 74,308
Exchange Differences (47,276) (1,704) 1,005 (2,803)
Acquisitions Through Business Combinations     212,941  
Balance at December 31 1,188,153 42,833 1,370,455 1,078,583
Mandatorily at fair value through profit or loss [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 112,259 4,047 259,507 211,556
Recognized in Profit or Loss 77,593 2,797 (138,045) 47,991
Exchange Differences (502) (18) (7) (40)
Acquisitions Through Business Combinations     2,085  
Disposal of Subsidiary     (11,281)  
Balance at December 31 189,350 6,826 112,259 259,507
Mandatorily at fair value through profit or loss [member] | Deferred tax liabilities [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 6,317 228 9,192 4,535
Recognized in Profit or Loss 6,274 226 (2,942) 4,706
Exchange Differences (11) (1) 67 (49)
Balance at December 31 12,580 453 6,317 9,192
Other temporary differences [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 2,407,910 86,803 1,744,949 1,838,746
Recognized in Profit or Loss 679,492 24,495 679,197 (84,377)
Recognized in Equity (7) 0 (999) 1,160
Exchange Differences 52,399 1,889 (45,169) (24,906)
Acquisitions Through Business Combinations     150,291 14,326
Disposal of Subsidiary (269,080) (9,700) (120,359)  
Balance at December 31 2,870,714 103,487 2,407,910 1,744,949
Other temporary differences [member] | Deferred tax liabilities [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 1,134,323 40,891 556,428 566,074
Recognized in Profit or Loss 310,681 11,200 54,755 (90,524)
Recognized in Other Comprehensive Income 160,084 5,771 237,460 78,124
Recognized in Equity 2 0 160 (244)
Exchange Differences 69,848 2,518 (1,060) (3,144)
Acquisitions Through Business Combinations     287,375 6,142
Disposal of Subsidiary (14,065) (507) (795)  
Balance at December 31 1,660,873 59,873 1,134,323 556,428
Temporary differences [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 4,520,326 162,954 3,627,883 3,804,916
Recognized in Profit or Loss 454,935 16,400 509,151 (214,104)
Recognized in Other Comprehensive Income (19,319) (696) 114,559 74,308
Recognized in Equity (7) 0 (999) 1,160
Exchange Differences (2,557) (92) (31,736) (52,772)
Acquisitions Through Business Combinations     447,090 14,375
Disposal of Subsidiary (614,184) (22,141) (145,622)  
Balance at December 31 4,339,194 156,425 4,520,326 3,627,883
Unused tax losses [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 527,666 19,022 542,781 672,275
Recognized in Profit or Loss 187,981 6,777 (44,651) (166,128)
Exchange Differences (31,077) (1,121) (915) (12,203)
Acquisitions Through Business Combinations     183,045 48,837
Disposal of Subsidiary (45,788) (1,651) (152,594)  
Balance at December 31 638,782 23,027 527,666 542,781
Unused tax credits [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 429,381 15,479 537,040 631,166
Recognized in Profit or Loss (15,549) (561) (86,100) (86,722)
Exchange Differences (22,798) (822) (21,559) (7,404)
Balance at December 31 $ 391,034 $ 14,096 $ 429,381 $ 537,040