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Retirement Benefit Plans - Summary of Movements in Net Defined Benefit Liability (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 net defined benefit liability (asset) [line items]        
Beginning balance $ 5,561,596 $ 180,983 $ 6,196,840 $ 4,926,396
Current service cost 141,458 4,603 173,307 193,693
Past service cost and gain on settlements (100) (3) (10,284) (25,891)
Net interest expense (income) 39,048 1,271 18,740 38,200
Recognized in profit or loss 180,406 5,871 181,763 206,002
Return on plan assets (excluding amounts included in net interest) (324,510) (10,560) (42,636) (109,616)
Changes in financial assumptions (1,053,680) (34,288) (418,542) 465,433
Experience adjustments 217,658 7,083 242,896 281,661
Changes in demographic assumptions (507) (17) 160,156 (36,627)
Recognized in other comprehensive income (1,161,039) (37,782) (58,126) 600,851
Contributions from the employer (736,508) (23,967) (542,584) (620,433)
Benefits paid from the pension fund 0 0 6,023 50,707
Benefits paid from the Group (115,695) (3,765) (80,603) (14,520)
Assets extinguished on settlement (2,920) (95)   11,910
Business combinations     46,291 1,018,480
Exchange differences on foreign plans 58,280 1,896 (188,008) 17,447
Ending balance 3,784,120 123,141 5,561,596 6,196,840
Defined benefit obligation [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance 11,424,860 371,782 12,159,145 10,668,574
Current service cost 141,458 4,603 173,307 193,693
Past service cost and gain on settlements (100) (3) (10,284) (25,891)
Net interest expense (income) 118,489 3,856 78,501 119,314
Recognized in profit or loss 259,847 8,456 241,524 287,116
Return on plan assets (excluding amounts included in net interest) 0 0 0 0
Changes in financial assumptions (1,053,680) (34,288) (418,542) 465,433
Experience adjustments 217,658 7,083 242,896 281,661
Changes in demographic assumptions (507) (17) 160,156 (36,627)
Recognized in other comprehensive income (836,529) (27,222) (15,490) 710,467
Contributions from the employer   0 0 0
Benefits paid from the pension fund (571,930) (18,611) (556,419) (552,430)
Benefits paid from the Group (115,695) (3,765) (80,603) (14,520)
Assets extinguished on settlement (2,920) (95)   0
Business combinations     46,291 1,018,480
Exchange differences on foreign plans 104,364 3,396 (369,588) 41,458
Ending balance 10,261,997 333,941 11,424,860 12,159,145
Fair value of plan assets [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance (5,863,264) (190,799) (5,962,305) (5,742,178)
Current service cost 0 0 0 0
Past service cost and gain on settlements 0   0 0
Net interest expense (income) (79,441) (2,585) (59,761) (81,114)
Recognized in profit or loss (79,441) (2,585) (59,761) (81,114)
Return on plan assets (excluding amounts included in net interest) (324,510) (10,560) (42,636) (109,616)
Changes in financial assumptions 0 0 0 0
Experience adjustments 0 0 0 0
Changes in demographic assumptions 0 0 0 0
Recognized in other comprehensive income (324,510) (10,560) (42,636) (109,616)
Contributions from the employer (736,508) (23,967) (542,584) (620,433)
Benefits paid from the pension fund 571,930 18,611 562,442 603,137
Benefits paid from the Group 0 0 0 0
Assets extinguished on settlement 0 0   11,910
Business combinations     0 0
Exchange differences on foreign plans (46,084) (1,500) 181,580 (24,011)
Ending balance $ (6,477,877) $ (210,800) $ (5,863,264) $ (5,962,305)