Contents of Significant Accounts - Summary of Balances of Contract Assets and Contract Liabilities (Detail) $ in Thousands, $ in Thousands |
Dec. 31, 2025
TWD ($)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
TWD ($)
|
Jan. 01, 2024
TWD ($)
|
|---|---|---|---|---|
| Disclosure of balances of contract assets and contract liabilities [line items] | ||||
| Contract assets, current | $ 705,398 | $ 625,713 | $ 739,528 | |
| Contract liabilities, current | 2,580,789 | $ 82,269 | 2,200,561 | 3,250,712 |
| Contract liabilities, non-current | 1,787,375 | $ 56,977 | 459,620 | 430,640 |
| Contract liabilities | 4,368,164 | 2,660,181 | 3,681,352 | |
| Sales of Goods and Services [member] | ||||
| Disclosure of balances of contract assets and contract liabilities [line items] | ||||
| Contract assets, current | 1,107,419 | 1,043,680 | 1,132,477 | |
| Contract liabilities | 4,368,164 | 2,660,181 | 3,681,352 | |
| Loss allowance [member] | ||||
| Disclosure of balances of contract assets and contract liabilities [line items] | ||||
| Contract assets, current | $ (402,021) | $ (417,967) | $ (392,949) |