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Financial Statements Schedule: Valuation and Qualifying Accounts (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Allowance for Impairment of property, plant and equipment [member]      
Disclosure of details of valuation and qualifying accounts [Line Items]      
January 1 $ 194,467 $ 183,179 $ 182,002
Additions charged to expense or deduction of revenue 9,236 12,721 4,843
Deduction/Write-offs/Reversal   (1,433) (3,666)
December 31 203,703 194,467 183,179
Allowance for Impairment of Obsolescence and Decline in Market Value of Inventories [Member]      
Disclosure of details of valuation and qualifying accounts [Line Items]      
January 1 105,630 121,586 79,815
Additions charged to expense or deduction of revenue 80,633   41,771
Deduction/Write-offs/Reversal   (15,956)  
December 31 186,263 105,630 121,586
Provision for deficiency compensation [member]      
Disclosure of details of valuation and qualifying accounts [Line Items]      
January 1 26,643 4,281 3,463
Additions charged to expense or deduction of revenue 21,495 79,827 11,898
Deduction/Write-offs/Reversal (14,574) (57,465) (11,080)
December 31 33,564 26,643 4,281
Sales for allowance [member]      
Disclosure of details of valuation and qualifying accounts [Line Items]      
January 1 37,123 9,849 9,864
Additions charged to expense or deduction of revenue 112,488 94,641 34,744
Deduction/Write-offs/Reversal (111,944) (67,367) (34,759)
December 31 $ 37,667 $ 37,123 $ 9,849