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Profit Before Income Tax - Summary of Other Operating Income and Expenses, Net (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]        
Rental income $ 702,916 $ 21,437 $ 692,010 $ 656,745
Gain on disposal of property, plant and equipment 208,980 6,373 161,761 113,356
Royalty income 275,289 8,396 674,859 638,867
Impairment loss on non-financial assets (Notes 15 and 19) (133,880) (4,083) (146,570) (327,569)
Others 119,287 3,638 (60,290) (67,071)
Other operating income and expenses, net $ 1,172,592 $ 35,761 $ 1,321,770 $ 1,014,328