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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, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 $ (319,625) $ (10,784) $ 168,966 $ 332,401
Recognized in Profit or Loss (555,646) (18,746) (355,439) (115,062)
Recognized in Other Comprehensive Income (51,217) (1,728) 73,637 11,002
Recognized in Equity 262 9 (204) (33)
Exchange Differences (33,440) (1,129) (209,524) (59,342)
Acquisitions through business combinations     2,939  
Balance at December 31 (959,666) (32,378) (319,625) 168,966
Property, plant and equipment [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (3,758,847) (126,817) (3,504,458) (2,431,855)
Recognized in Profit or Loss (101,576) (3,427) (182,291) (1,083,273)
Exchange Differences (18,643) (629) (72,098) 10,670
Balance at December 31 (3,879,066) (130,873) (3,758,847) (3,504,458)
Defined benefit obligation [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 873,484 29,470 845,939 796,642
Recognized in Profit or Loss (26,736) (902) (48,601) 20,398
Recognized in Other Comprehensive Income (51,217) (1,728) 73,637 11,002
Exchange Differences (15,291) (516) 2,509 17,897
Balance at December 31 780,240 26,324 873,484 845,939
FVTPL financial instruments [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (21,363) (721) (232,198) (170,059)
Recognized in Profit or Loss (86,342) (2,913) 212,737 (62,152)
Exchange Differences 2,802 94 (1,902) 13
Balance at December 31 (104,903) (3,540) (21,363) (232,198)
Other temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 1,079,824 36,431 1,384,987 1,166,297
Recognized in Profit or Loss (22,748) (767) (283,179) 229,799
Recognized in Equity 262 9 (204) (33)
Exchange Differences (28,929) (976) (21,780) (11,076)
Balance at December 31 1,028,409 34,697 1,079,824 1,384,987
Temporary differences [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 (1,826,902) (61,637) (1,505,730) (638,975)
Recognized in Profit or Loss (237,402) (8,009) (301,334) (895,228)
Recognized in Other Comprehensive Income (51,217) (1,728) 73,637 11,002
Recognized in Equity 262 9 (204) (33)
Exchange Differences (60,061) (2,027) (93,271) 17,504
Balance at December 31 (2,175,320) (73,392) (1,826,902) (1,505,730)
Unused tax losses [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 1,124,541 37,940 1,323,577 519,898
Recognized in Profit or Loss (456,246) (15,393) (110,967) 812,217
Exchange Differences 13,146 444 (91,008) (8,538)
Acquisitions through business combinations     2,939  
Balance at December 31 681,441 22,991 1,124,541 1,323,577
Unused tax credits [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1 382,736 12,913 351,119 452,331
Recognized in Profit or Loss 138,002 4,656 56,862 (32,904)
Exchange Differences 13,475 454 (25,245) (68,308)
Balance at December 31 $ 534,213 $ 18,023 $ 382,736 351,119
Others [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Balance at January 1       (853)
Recognized in Profit or Loss       $ 853