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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
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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

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