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Expenses by nature - Summary of Expenses by nature (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Analysis of income and expense [abstract]      
Raw materials and supplies used $ 3,991,490 $ 4,512,527 $ 5,518,145
Employee benefit expenses 5,836,068 6,466,303 6,757,888
Depreciation expenses 4,779,333 4,751,902 4,634,112
Others 4,926,828 4,699,586 5,053,088
Total operating costs and expenses $ 19,533,719 $ 20,430,318 $ 21,963,233