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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, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance $ 3,972,517 $ 134,026 $ 3,999,947 $ 4,171,806
Current service cost 278,412 9,393 329,838 335,655
Past service cost and gain on settlements (68,979) (2,328)    
Net interest expense (income) 53,663 1,811 58,031 75,533
Recognized in profit or loss 263,096 8,876 387,869 411,188
Return on plan assets (excluding amounts included in net interest) 52,124 1,759 54,549 12,426
Actuarial loss arising from changes in financial assumptions 56,860 1,918 156,193 309,695
Actuarial loss (gain) arising from experience adjustments (315,090) (10,631) 200,723 (243,363)
Actuarial loss (gain) arising from changes in demographic assumptions 762 26 5,716 (15,847)
Recognized in other comprehensive income (205,344) (6,928) 417,181 62,911
Contributions from the employer (484,790) (16,356) (807,232) (611,581)
Benefits paid from the Group (96,575) (3,258) (36,033) (43,088)
Exchange differences on foreign plans 120,361 4,061 10,785 8,711
Ending balance 3,569,265 120,421 3,972,517 3,999,947
Defined benefit obligation [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance 8,389,884 283,060 7,973,676 7,674,293
Current service cost 278,412 9,393 329,838 335,655
Past service cost and gain on settlements (68,979) (2,328)    
Net interest expense (income) 157,404 5,311 167,111 183,889
Recognized in profit or loss 366,837 12,376 496,949 519,544
Actuarial loss arising from changes in financial assumptions 56,860 1,918 156,193 309,695
Actuarial loss (gain) arising from experience adjustments (315,090) (10,631) 200,723 (243,363)
Actuarial loss (gain) arising from changes in demographic assumptions 762 26 5,716 (15,847)
Recognized in other comprehensive income (257,468) (8,687) 362,632 50,485
Benefits paid from the pension fund (690,830) (23,307) (308,471) (192,928)
Benefits paid from the Group (96,575) (3,258) (36,033) (43,088)
Liabilities assumed in a business combination     535  
Exchange differences on foreign plans 198,790 6,707 (99,404) (34,630)
Ending balance 7,910,638 266,891 8,389,884 7,973,676
Fair value of plan assets [member]        
Disclosure of net defined benefit liability (asset) [line items]        
Beginning balance (4,417,367) (149,034) (3,973,729) (3,502,487)
Net interest expense (income) (103,741) (3,500) (109,080) (108,356)
Recognized in profit or loss (103,741) (3,500) (109,080) (108,356)
Return on plan assets (excluding amounts included in net interest) 52,124 1,759 54,549 12,426
Recognized in other comprehensive income 52,124 1,759 54,549 12,426
Contributions from the employer (484,790) (16,356) (807,232) (611,581)
Benefits paid from the pension fund 690,830 23,307 308,471 192,928
Liabilities assumed in a business combination     (535)  
Exchange differences on foreign plans (78,429) (2,646) 110,189 43,341
Ending balance $ (4,341,373) $ (146,470) $ (4,417,367) $ (3,973,729)