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Expenses by nature - Summary of Expenses by nature (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Analysis of income and expense [abstract]      
Raw materials and supplies used $ 4,512,527 $ 5,518,145 $ 4,708,493
Employee benefit expenses 6,466,303 6,757,888 6,010,227
Depreciation expenses 4,751,902 4,634,112 4,175,519
Others 4,699,586 5,053,088 4,686,218
Total operating costs and expenses $ 20,430,318 $ 21,963,233 $ 19,580,457