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Long-term Bank Loans - Summary of Long-term Bank Loans (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [Line Items]      
Bank loans $ 13,758,581 $ 14,911,719  
Less: Unamortized interest on government granted bank loans (31,612) (60,592)  
Less: Current portion (3,326,042) (2,263,718) $ (101,435)
Syndicated bank loans, excluding current portion 10,432,539 12,648,001 $ 318,162
Long-term bank loans [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Unused credit lines of long-term bank loans $ 7,863,170 $ 7,232,770  
Gross carrying amount [member] | Minimum [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Interest rate range 1.325% 1.20% 1.325%
Gross carrying amount [member] | Maximum [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Interest rate range 1.875% 1.75% 1.875%
Gross carrying amount [member] | Government granted bank loans [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Bank loans $ 13,790,193 $ 14,972,311