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Financial Risk and Fair Value Disclosures - Assets and Liabilities Not Recorded at Fair Value on a Recurring Basis But for Which Fair Value is Disclosed (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of fair value measurement of liabilities [line items]    
Bonds payables (current portion included) $ 30,051,568 $ 38,359,352
Long-term loans (current portion included) 36,476,909 22,883,344
Not measured at fair value in statement of financial position but for which fair value is disclosed [member]    
Disclosure of fair value measurement of liabilities [line items]    
Bonds payables (current portion included) 30,020,005 38,367,168
Long-term loans (current portion included) 36,476,909 22,883,344
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 1 [member]    
Disclosure of fair value measurement of liabilities [line items]    
Bonds payables (current portion included) 24,409,952 32,827,211
Long-term loans (current portion included) 0 0
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 2 [member]    
Disclosure of fair value measurement of liabilities [line items]    
Bonds payables (current portion included) 5,610,053 5,539,957
Long-term loans (current portion included) 36,476,909 22,883,344
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] | Level 3 [member]    
Disclosure of fair value measurement of liabilities [line items]    
Bonds payables (current portion included) 0 0
Long-term loans (current portion included) $ 0 $ 0