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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, 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) |  |

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