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Profit Before Income Tax - Summary of Other Gains, Net (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Gain on remeasurement of investments accounted for using the equity method (Note 15) | $ 242,451 | $ 7,421,408 |  |
Net gains on financial assets mandatorily at FVTPL | 110,699 | 3,388,485 |  |
Gain on disposal of subsidiaries (Note 31) |  |  | $ 5,589,457 |
Net gains (losses) arising on financial instruments held for trading | (45,704) | (1,398,995) | (3,111,253) | $ 224,446
Net gains on financial assets designated as at FVTPL |  |  | 327,351 | 223,113
Foreign exchange gains (losses), net | (33,180) | (1,015,615) | 3,502,586 | 1,928,384
Impairment losses on financial assets | (17,021) | (521,010) | (50,206) | (91,886)
Others |  |  | 1,518 | (7,513)
Other gains and losses | $ 257,245 | $ 7,874,273 | $ 6,259,453 | $ 2,276,544

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