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Investments Accounted for Using the Equity Method - Summary of Aggregate Information of Associates that are Not Individually Material (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 associates and joint ventures [line items] |  |  |  |
Net profit (loss) | $ 895,926 | $ 27,424,309 | $ 24,497,060 | $ 22,577,861
Other comprehensive income (loss) | (27,855) | (852,632) | (4,637,933) | (7,959,259)
Total comprehensive loss | 868,071 | 26,571,677 | 19,859,127 | 14,618,602
Associates that are not individually material [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Net profit (loss) | 4,820 | 147,535 | (190,532) | (139,366)
Other comprehensive income (loss) | (20,042) | (613,471) | 59,676 | (115,650)
Total comprehensive loss | $ (15,222) | $ (465,936) | $ (130,856) | $ (255,016)

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