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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, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance $ 3,584,736 $ 109,324 $ 3,784,120 $ 5,561,596
Current service cost 139,168 4,245 126,956 141,458
Past service cost and gain (loss) on settlements 274 8 1,194 (100)
Net interest expense (income) 61,559 1,877 62,108 39,048
Other termination benefit cost     7,822  
Recognized in profit or loss 201,001 6,130 198,080 180,406
Return on plan assets (excluding amounts included in net interest) (437,258) (13,335) (9,327) (324,510)
Changes in financial assumptions (46,189) (1,409) 391,077 (1,053,680)
Experience adjustments 249,911 7,622 (309,843) 217,658
Changes in demographic assumptions (16,009) (488) (6,476) (507)
Recognized in other comprehensive income (249,545) (7,610) 65,431 (1,161,039)
Contributions from the employer (646,687) (19,722) (597,870) (736,508)
Benefits paid from the pension fund 0 0 (5,402) 0
Benefits paid from the Group (124,601) (3,800) (79,659) (115,695)
Liabilities extinguished on settlement (5,270) (161) (2,830) (2,920)
Liabilities assumed in a business combination 158,053 4,820 204,975  
Exchange differences on foreign plans (48,100) (1,467) 17,891 58,280
Ending balance 2,869,587 87,514 3,584,736 3,784,120
Defined benefit obligation [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance 10,201,794 311,125 10,261,997 11,424,860
Current service cost 139,168 4,245 126,956 141,458
Past service cost and gain (loss) on settlements 274 8 1,194 (100)
Net interest expense (income) 205,562 6,269 236,102 118,489
Other termination benefit cost     7,822  
Recognized in profit or loss 345,004 10,522 372,074 259,847
Return on plan assets (excluding amounts included in net interest) 0 0 0 0
Changes in financial assumptions (46,189) (1,409) 391,077 (1,053,680)
Experience adjustments 249,911 7,622 (309,843) 217,658
Changes in demographic assumptions (16,009) (488) (6,476) (507)
Recognized in other comprehensive income 187,713 5,725 74,758 (836,529)
Contributions from the employer 0 0 0 0
Benefits paid from the pension fund (539,124) (16,442) (615,377) (571,930)
Benefits paid from the Group (124,601) (3,800) (79,659) (115,695)
Liabilities extinguished on settlement (5,836) (178) (2,830) (2,920)
Liabilities assumed in a business combination 158,053 4,820 204,975  
Exchange differences on foreign plans (99,106) (3,023) (14,144) 104,364
Ending balance 10,123,897 308,749 10,201,794 10,261,997
Fair value of plan assets [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance (6,617,058) (201,801) (6,477,877) (5,863,264)
Current service cost 0 0 0 0
Past service cost and gain (loss) on settlements 0 0 0 0
Net interest expense (income) (144,003) (4,392) (173,994) (79,441)
Other termination benefit cost     0  
Recognized in profit or loss (144,003) (4,392) (173,994) (79,441)
Return on plan assets (excluding amounts included in net interest) (437,258) (13,335) (9,327) (324,510)
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 (437,258) (13,335) (9,327) (324,510)
Contributions from the employer (646,687) (19,722) (597,870) (736,508)
Benefits paid from the pension fund 539,124 16,442 609,975 571,930
Benefits paid from the Group 0 0 0 0
Liabilities extinguished on settlement 566 17 0 0
Liabilities assumed in a business combination 0 0 0  
Exchange differences on foreign plans 51,006 1,556 32,035 (46,084)
Ending balance $ (7,254,310) $ (221,235) $ (6,617,058) $ (6,477,877)