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Income Tax - Summary of Movements of Deferred Tax Assets and Deferred Tax Liabilities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 $ (31,352) $ (959,666) $ (319,625) $ 168,966
Recognized in Profit or Loss (14,128) (432,442) (555,646) (355,439)
Recognized in Other Comprehensive Income 4,120 126,101 (51,217) 73,637
Recognized in Equity (36) (1,099) 262 (204)
Exchange Differences 3,762 115,153 (33,440) (209,524)
Acquisitions Through Business Combinations 17,999 550,955   2,939
Balance at December 31 (22,815) (698,356) (959,666) (319,625)
Property, plant and equipment [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (126,726) (3,879,066) (3,758,847) (3,504,458)
Recognized in Profit or Loss (19,609) (600,229) (101,576) (182,291)
Exchange Differences (691) (21,146) (18,643) (72,098)
Acquisitions Through Business Combinations (1,499) (45,873)    
Balance at December 31 (148,525) (4,546,314) (3,879,066) (3,758,847)
Defined benefit obligation [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 25,490 780,240 873,484 845,939
Recognized in Profit or Loss (4,302) (131,687) (26,736) (48,601)
Recognized in Other Comprehensive Income 4,120 126,101 (51,217) 73,637
Exchange Differences 911 27,884 (15,291) 2,509
Acquisitions Through Business Combinations 8,569 262,286    
Balance at December 31 34,788 1,064,824 780,240 873,484
Mandatorily at fair value through profit or loss [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (3,427) (104,903) (21,363) (232,198)
Recognized in Profit or Loss 9,300 284,659 (86,342) 212,737
Exchange Differences (4) (137) 2,802 (1,902)
Acquisitions Through Business Combinations 895 27,402    
Balance at December 31 6,764 207,021 (104,903) (21,363)
Other temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 33,597 1,028,409 1,079,824 1,384,987
Recognized in Profit or Loss (854) (26,147) (22,748) (283,179)
Recognized in Equity (36) (1,099) 262 (204)
Exchange Differences 2,428 74,327 (28,929) (21,780)
Acquisitions Through Business Combinations 9,622 294,540    
Balance at December 31 41,576 1,272,672 1,028,409 1,079,824
Temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (71,066) (2,175,320) (1,826,902) (1,505,730)
Recognized in Profit or Loss (15,465) (473,404) (237,402) (301,334)
Recognized in Other Comprehensive Income 4,120 126,101 (51,217) 73,637
Recognized in Equity (36) (1,099) 262 (204)
Exchange Differences 2,644 80,928 (60,061) (93,271)
Acquisitions Through Business Combinations 17,587 538,355    
Balance at December 31 (65,397) (2,001,797) (2,175,320) (1,826,902)
Unused tax losses [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 22,262 681,441 1,124,541 1,323,577
Recognized in Profit or Loss (1,635) (50,059) (456,246) (110,967)
Exchange Differences 924 28,293 13,146 (91,008)
Acquisitions Through Business Combinations 412 12,600   2,939
Balance at December 31 21,963 672,275 681,441 1,124,541
Unused tax credits [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 17,452 534,213 382,736 351,119
Recognized in Profit or Loss 2,973 91,021 138,002 56,862
Exchange Differences 194 5,932 13,475 (25,245)
Balance at December 31 20,619 631,166 $ 534,213 $ 382,736
Adjustments arising from initial application [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss (3,181) (97,358)    
Adjustments arising from initial application [member] | Other temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss (3,181) (97,358)    
Adjustments arising from initial application [member] | Temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Recognized in Profit or Loss $ (3,181) $ (97,358)