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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, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Disclosure of associates and joint ventures [line items] |  |  |  |
Net profit (loss) | $ 18,268,565 | $ 610,784 | $ 27,424,309 | $ 24,497,060
Other comprehensive income (loss) | (4,370,611) | (146,126) | (852,632) | (4,637,933)
Total comprehensive income (loss) | 13,897,954 | 464,658 | 26,571,677 | 19,859,127
Associates that are not individually material [member] |  |  |  |
Disclosure of associates and joint ventures [line items] |  |  |  |
Net profit (loss) | 321,413 | 10,746 | 147,535 | (190,532)
Other comprehensive income (loss) | 1,401,453 | 46,856 | (613,471) | 59,676
Total comprehensive income (loss) | $ 1,722,866 | $ 57,602 | $ (465,936) | $ (130,856)

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