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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
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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

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