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Retirement Benefit Plans - Summary of Movements in Net Defined Benefit Liability (Asset) (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance $ 4,926,396 $ 175,442 $ 4,805,016 $ 3,569,265
Current service cost 193,693 6,898 211,226 224,126
Past service cost and gain on settlements (25,891) (922)    
Net interest expense (income) 38,200 1,360 54,248 56,070
Recognized in profit or loss 206,002 7,336 265,474 280,196
Return on plan assets (excluding amounts included in net interest) (109,616) (3,904) (104,516) (16,589)
Changes in financial assumptions 465,433 16,575 398,732 (8,643)
Experience adjustments 281,661 10,031 70,374 302,499
Changes in demographic assumptions (36,627) (1,304) (2,329) 8,190
Changes in other assumptions       22,723
Recognized in other comprehensive income 594,778 21,181 365,262 308,180
Contributions from the employer (620,433) (22,095) (514,617) (364,237)
Benefits paid from the pension fund 50,707 1,806 0 0
Benefits paid from the Group (14,520) (517) (21,439) (295,953)
Assets extinguished on settlement 11,910 424    
Business combinations 1,018,480 36,270 34,477 1,312,281
Exchange differences on foreign plans 17,447 621 (4,776) (4,716)
Ending balance 6,196,840 220,685 4,926,396 4,805,016
Defined benefit obligation [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance 10,668,574 379,935 10,297,139 7,910,638
Current service cost 193,693 6,898 211,226 224,126
Past service cost and gain on settlements (25,891) (922)    
Net interest expense (income) 119,314 4,249 151,635 178,779
Recognized in profit or loss 287,116 10,225 362,861 402,905
Return on plan assets (excluding amounts included in net interest) 0 0 0 0
Changes in financial assumptions 465,433 16,575 398,732 (8,643)
Experience adjustments 281,661 10,031 70,374 302,499
Changes in demographic assumptions (36,627) (1,304) (2,329) 8,190
Changes in other assumptions       22,723
Recognized in other comprehensive income 710,467 25,302 466,777 324,769
Contributions from the employer 0 0 0 0
Benefits paid from the pension fund (552,430) (19,673) (393,897) (541,989)
Benefits paid from the Group (14,520) (517) (21,439) (295,953)
Assets extinguished on settlement 0 0    
Business combinations 1,018,480 36,270 62,857 2,522,805
Exchange differences on foreign plans 41,458 1,476 (105,724) (26,036)
Ending balance 12,159,145 433,018 10,668,574 10,297,139
Fair value of plan assets [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance (5,742,178) (204,493) (5,492,123) (4,341,373)
Current service cost 0 0 0 0
Past service cost and gain on settlements 0      
Net interest expense (income) (81,114) (2,889) (97,387) (122,709)
Recognized in profit or loss (81,114) (2,889) (97,387) (122,709)
Return on plan assets (excluding amounts included in net interest) (109,616) (3,904) (104,516) (16,589)
Changes in financial assumptions 0 0 0 0
Experience adjustments 0 0 0 0
Changes in demographic assumptions 0 0 0 0
Changes in other assumptions       0
Recognized in other comprehensive income (109,616) (3,904) (104,516) (16,589)
Contributions from the employer (620,433) (22,095) (514,617) (364,237)
Benefits paid from the pension fund 603,137 21,479 393,897 541,989
Benefits paid from the Group 0 0 0 0
Assets extinguished on settlement 11,910 424    
Business combinations 0 0 (28,380) (1,210,524)
Exchange differences on foreign plans (24,011) (855) 100,948 21,320
Ending balance $ (5,962,305) $ (212,333) $ (5,742,178) $ (5,492,123)