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Profit Before Income Tax - Summary of Operating Expenses Directly Related to Investment Properties (Detail)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Direct operating expense from investment property [abstract]      
Direct operating expenses of investment properties that generated rental income $ 41,710 $ 1,276,751 $ 465,458