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Profit Before Income Tax - Summary of Other Income (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
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