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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, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance $ 4,805,016 $ 160,650 $ 3,569,265 $ 3,972,517
Current service cost 211,226 7,062 224,126 278,412
Past service cost and gain on settlements       (68,979)
Net interest expense (income) 54,248 1,814 56,070 53,663
Recognized in profit or loss 265,474 8,876 280,196 263,096
Return on plan assets (excluding amounts included in net interest) (104,516) (3,494) (16,589) 52,124
Actuarial loss (gain) arising from changes in financial assumptions 398,732 13,331 (8,643) 56,860
Actuarial loss (gain) arising from experience adjustments 70,374 2,353 302,499 (315,090)
Actuarial loss arising from changes in demographic assumptions (2,329) (78) 8,190 762
Actuarial loss arising from changes in other assumptions     22,723  
Recognized in other comprehensive income 365,262 12,212 308,180 (205,344)
Contributions from the employer (514,617) (17,206) (364,237) (484,790)
Benefits paid from the pension fund 0   0 0
Benefits paid from the Group (21,439) (717) (295,953) (96,575)
Business combinations 34,477 1,152 1,312,281  
Exchange differences on foreign plans (4,776) (160) (4,716) 120,361
Ending balance 4,926,396 164,707 4,805,016 3,569,265
Defined benefit obligation [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance 10,297,139 344,271 7,910,638 8,389,884
Current service cost 211,226 7,062 224,126 278,412
Past service cost and gain on settlements       (68,979)
Net interest expense (income) 151,635 5,070 178,779 157,404
Recognized in profit or loss 362,861 12,132 402,905 366,837
Return on plan assets (excluding amounts included in net interest) 0   0 0
Actuarial loss (gain) arising from changes in financial assumptions 398,732 13,331 (8,643) 56,860
Actuarial loss (gain) arising from experience adjustments 70,374 2,353 302,499 (315,090)
Actuarial loss arising from changes in demographic assumptions (2,329) (78) 8,190 762
Actuarial loss arising from changes in other assumptions     22,723  
Recognized in other comprehensive income 466,777 15,606 324,769 (257,468)
Contributions from the employer 0   0 0
Benefits paid from the pension fund (393,897) (13,169) (541,989) (690,830)
Benefits paid from the Group (21,439) (717) (295,953) (96,575)
Business combinations 62,857 2,101 2,522,805  
Exchange differences on foreign plans (105,724) (3,535) (26,036) 198,790
Ending balance 10,668,574 356,689 10,297,139 7,910,638
Fair value of plan assets [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance (5,492,123) (183,621) (4,341,373) (4,417,367)
Current service cost 0   0 0
Past service cost and gain on settlements       0
Net interest expense (income) (97,387) (3,256) (122,709) (103,741)
Recognized in profit or loss (97,387) (3,256) (122,709) (103,741)
Return on plan assets (excluding amounts included in net interest) (104,516) (3,494) (16,589) 52,124
Actuarial loss (gain) arising from changes in financial assumptions 0   0 0
Actuarial loss (gain) arising from experience adjustments 0   0 0
Actuarial loss arising from changes in demographic assumptions 0   0 0
Actuarial loss arising from changes in other assumptions     0  
Recognized in other comprehensive income (104,516) (3,494) (16,589) 52,124
Contributions from the employer (514,617) (17,206) (364,237) (484,790)
Benefits paid from the pension fund 393,897 13,169 541,989 690,830
Benefits paid from the Group 0   0 0
Business combinations (28,380) (949) (1,210,524)  
Exchange differences on foreign plans 100,948 3,375 21,320 (78,429)
Ending balance $ (5,742,178) $ (191,982) $ (5,492,123) $ (4,341,373)