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Profit Before Income Tax - Summary of Other Income (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Analysis of income and expense [abstract]        
Government subsidy $ 803,049 $ 28,599 $ 624,351 $ 435,950
Interest income 520,783 18,546 549,681 466,211
Dividends income 150,715 5,367 185,061 190,397
Other income $ 1,474,547 $ 52,512 $ 1,359,093 $ 1,092,558