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Financial Risk Management and Fair Values of Financial Instruments - Maturity Profile of Non-derivative Financial Liabilities Based on Contracted Undiscounted Payments (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Short-term bank loans $ 341,018  
Long-term bank loans 14,316,256 $ 15,580,584
Lease liabilities 1,299,468 1,257,694
Guarantee deposits 21,186 21,235
Total 15,977,928 16,859,513
Within 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Short-term bank loans 341,018  
Long-term bank loans 3,525,490 2,469,744
Lease liabilities 253,805 267,759
Total 4,120,313 2,737,503
1 to 3 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 6,678,601 7,506,844
Lease liabilities 149,308 250,104
Total 6,827,909 7,756,948
3 to 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 3,061,642 4,273,199
Lease liabilities 71,714 57,856
Total 3,133,356 4,331,055
Over 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 1,050,523 1,330,797
Lease liabilities 824,641 681,975
Guarantee deposits 21,186 21,235
Total $ 1,896,350 $ 2,034,007