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Expenses by nature - Summary of Expenses by nature (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Analysis of income and expense [abstract]      
Raw materials and supplies used $ 4,580,706 $ 3,991,490 $ 4,512,527
Employee benefit expenses 6,450,534 5,836,068 6,466,303
Depreciation expenses 4,856,186 4,779,333 4,751,902
Others 5,634,438 4,926,828 4,699,586
Total operating costs and expenses $ 21,521,864 $ 19,533,719 $ 20,430,318