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Profit Before Income Tax - Summary of Other Income (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Government subsidy | $ 624,351 | $ 20,874 | $ 435,950 | $ 341,844
Interest income | 549,681 | 18,378 | 466,211 | 306,871
Dividends income | 185,061 | 6,187 | 190,397 | 59,039
Other income | $ 1,359,093 | $ 45,439 | $ 1,092,558 | $ 707,754

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