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Profit Before Income Tax - Summary of Other Income (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Analysis of income and expense [abstract]        
Bank deposits $ 1,853,558 $ 56,528 $ 1,510,422 $ 646,407
Interest income from loans to related parties (Note 35) 29,960 914    
Contracts with customers     2,985 8,340
Government subsidies 846,404 25,813 940,127 797,612
Dividends income 194,812 5,941 256,160 278,381
Other income $ 2,924,734 $ 89,196 $ 2,709,694 $ 1,730,740