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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance $ 6,196,840 $ 223,390 $ 4,926,396 $ 4,805,016
Current service cost 173,307 6,248 193,693 211,226
Past service cost and gain on settlements (10,284) (371) (25,891)  
Net interest expense (income) 18,740 676 38,200 54,248
Recognized in profit or loss 181,763 6,553 206,002 265,474
Return on plan assets (excluding amounts included in net interest) (42,636) (1,537) (109,616) (104,516)
Changes in financial assumptions (418,542) (15,088) 465,433 398,732
Experience adjustments 242,896 8,756 281,661 70,374
Changes in demographic assumptions 160,156 5,773 (36,627) (2,329)
Recognized in other comprehensive income (58,126) (2,096) 600,851 362,261
Contributions from the employer (542,584) (19,560) (620,433) (514,617)
Benefits paid from the pension fund 6,023 217 50,707 0
Benefits paid from the Group (80,603) (2,906) (14,520) (21,439)
Assets extinguished on settlement     11,910  
Business combinations 46,291 1,669 1,018,480 34,477
Exchange differences on foreign plans (188,008) (6,777) 17,447 (4,776)
Ending balance 5,561,596 200,490 6,196,840 4,926,396
Defined benefit obligation [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance 12,159,145 438,325 10,668,574 10,297,139
Current service cost 173,307 6,248 193,693 211,226
Past service cost and gain on settlements (10,284) (371) (25,891)  
Net interest expense (income) 78,501 2,830 119,314 151,635
Recognized in profit or loss 241,524 8,707 287,116 362,861
Return on plan assets (excluding amounts included in net interest) 0 0 0 0
Changes in financial assumptions (418,542) (15,088) 465,433 398,732
Experience adjustments 242,896 8,756 281,661 70,374
Changes in demographic assumptions 160,156 5,773 (36,627) (2,329)
Recognized in other comprehensive income (15,490) (559) 710,467 466,777
Contributions from the employer 0 0 0 0
Benefits paid from the pension fund (556,419) (20,058) (552,430) (393,897)
Benefits paid from the Group (80,603) (2,906) (14,520) (21,439)
Assets extinguished on settlement     0  
Business combinations 46,291 1,669 1,018,480 62,857
Exchange differences on foreign plans (369,588) (13,323) 41,458 (105,724)
Ending balance 11,424,860 411,855 12,159,145 10,668,574
Fair value of plan assets [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance (5,962,305) (214,935) (5,742,178) (5,492,123)
Current service cost 0 0 0 0
Past service cost and gain on settlements 0   0  
Net interest expense (income) (59,761) (2,154) (81,114) (97,387)
Recognized in profit or loss (59,761) (2,154) (81,114) (97,387)
Return on plan assets (excluding amounts included in net interest) (42,636) (1,537) (109,616) (104,516)
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 (42,636) (1,537) (109,616) (104,516)
Contributions from the employer (542,584) (19,560) (620,433) (514,617)
Benefits paid from the pension fund 562,442 20,275 603,137 393,897
Benefits paid from the Group 0 0 0 0
Assets extinguished on settlement     11,910  
Business combinations 0 0 0 (28,380)
Exchange differences on foreign plans 181,580 6,546 (24,011) 100,948
Ending balance $ (5,863,264) $ (211,365) $ (5,962,305) $ (5,742,178)