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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, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Government subsidy | $ 341,844 | $ 11,533 | $ 332,758 | $ 176,721
Interest income | 306,871 | 10,353 | 230,067 | 242,084
Dividends income | 59,039 | 1,992 | 26,411 | 396,973
Other income | $ 707,754 | $ 23,878 | $ 589,236 | $ 815,778

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