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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, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Government subsidy | $ 14,242 | $ 435,950 | $ 341,844 | $ 332,758
Interest income | 15,231 | 466,211 | 306,871 | 230,067
Dividends income | 6,220 | 190,397 | 59,039 | 26,411
Other income | $ 35,693 | $ 1,092,558 | $ 707,754 | $ 589,236

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