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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, 2023
Dec. 31, 2022
Disclosure of fair value measurement of liabilities [line items]    
Bonds payables (current portion included) $ 38,359,352 $ 28,184,687
Long-term loans (current portion included) 22,883,344 19,279,342
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) 38,367,168 28,346,985
Long-term loans (current portion included) 22,883,344 19,279,342
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) 32,827,211 22,916,330
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) 5,539,957 5,430,655
Long-term loans (current portion included) 22,883,344 19,279,342
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