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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
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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

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