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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss $ (260,466) $ (8,476) $ 144,784 $ (100,879)
Recognized in Other Comprehensive Income 161,609 5,259 (179,403) (122,901)
Recognized in Equity 0 0 (9) (1,159)
Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 5,369,010 174,715 5,477,373 4,707,704
Recognized in Profit or Loss 940,256 30,597 627,367 378,400
Recognized in Other Comprehensive Income (208,482) (6,784) (19,319) 114,559
Recognized in Equity     (7) (999)
Exchange Differences 240,988 7,843 (56,432) (54,210)
Acquisitions Through Business Combinations       630,135
Disposal of Subsidiary     (659,972) (298,216)
Balance at December 31 6,341,772 206,371 5,369,010 5,477,373
Deferred tax liabilities [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 7,590,197 246,996 7,121,027 5,772,237
Recognized in Profit or Loss 1,200,722 39,073 482,583 479,278
Recognized in Other Comprehensive Income (370,091) (12,043) 160,084 237,460
Recognized in Equity     2 160
Exchange Differences 164,304 5,347 27,400 (30,241)
Acquisitions Through Business Combinations       662,928
Disposal of Subsidiary     (200,899) (795)
Balance at December 31 8,585,132 279,373 7,590,197 7,121,027
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 90,977 2,960 629,702 544,844
Recognized in Profit or Loss 40,498 1,318 (186,443) 4,632
Exchange Differences 16,953 552 (7,178) 12,435
Acquisitions Through Business Combinations       81,773
Disposal of Subsidiary     (345,104) (13,982)
Balance at December 31 148,428 4,830 90,977 629,702
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 5,916,744 192,540 5,980,387 5,206,617
Recognized in Profit or Loss 63,813 2,076 165,628 427,465
Exchange Differences 57,701 1,878 (42,437) (29,248)
Acquisitions Through Business Combinations       375,553
Disposal of Subsidiary     (186,834)  
Balance at December 31 6,038,258 196,494 5,916,744 5,980,387
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 1,188,153 38,664 1,370,455 1,078,583
Recognized in Profit or Loss (123,878) (4,031) (115,707) (36,633)
Recognized in Other Comprehensive Income (208,482) (6,784) (19,319) 114,559
Exchange Differences 6,641 216 (47,276) 1,005
Acquisitions Through Business Combinations       212,941
Balance at December 31 862,434 28,065 1,188,153 1,370,455
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 1 189,350 6,162 112,259 259,507
Recognized in Profit or Loss 18,192 592 77,593 (138,045)
Exchange Differences 252 8 (502) (7)
Acquisitions Through Business Combinations       2,085
Disposal of Subsidiary       (11,281)
Balance at December 31 207,794 6,762 189,350 112,259
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 12,580 409 6,317 9,192
Recognized in Profit or Loss 519,142 16,894 6,274 (2,942)
Exchange Differences 89 3 (11) 67
Balance at December 31 531,811 17,306 12,580 6,317
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 2,870,714 93,417 2,407,910 1,744,949
Recognized in Profit or Loss 718,909 23,394 679,492 679,197
Recognized in Equity     (7) (999)
Exchange Differences 179,881 5,854 52,399 (45,169)
Acquisitions Through Business Combinations       150,291
Disposal of Subsidiary     (269,080) (120,359)
Balance at December 31 3,769,504 122,665 2,870,714 2,407,910
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 1,660,873 54,047 1,134,323 556,428
Recognized in Profit or Loss 617,767 20,103 310,681 54,755
Recognized in Other Comprehensive Income (370,091) (12,043) 160,084 237,460
Recognized in Equity     2 160
Exchange Differences 106,514 3,466 69,848 (1,060)
Acquisitions Through Business Combinations       287,375
Disposal of Subsidiary     (14,065) (795)
Balance at December 31 2,015,063 65,573 1,660,873 1,134,323
Temporary differences [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 4,339,194 141,203 4,520,326 3,627,883
Recognized in Profit or Loss 653,721 21,273 454,935 509,151
Recognized in Other Comprehensive Income (208,482) (6,784) (19,319) 114,559
Recognized in Equity     (7) (999)
Exchange Differences 203,727 6,630 (2,557) (31,736)
Acquisitions Through Business Combinations       447,090
Disposal of Subsidiary     (614,184) (145,622)
Balance at December 31 4,988,160 162,322 4,339,194 4,520,326
Unused tax losses [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 638,782 20,787 527,666 542,781
Recognized in Profit or Loss (166,121) (5,406) 187,981 (44,651)
Exchange Differences 22,824 743 (31,077) (915)
Acquisitions Through Business Combinations       183,045
Disposal of Subsidiary     (45,788) (152,594)
Balance at December 31 495,485 16,124 638,782 527,666
Unused tax credits [member] | Deferred tax assets [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 391,034 12,725 429,381 537,040
Recognized in Profit or Loss 452,656 14,730 (15,549) (86,100)
Exchange Differences 14,437 470 (22,798) (21,559)
Balance at December 31 $ 858,127 $ 27,925 $ 391,034 $ 429,381