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Supplemental Cash Flow Information - Partial Cash Paid for Investing Activities (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Supplemental cash flow information [line items]        
Purchase of property, plant and equipment $ 5,451,431   $ 3,228,471 $ 4,918,482
Add: Beginning balance of payable to equipment suppliers 1,196,181   1,405,931 1,816,555
Less: Ending balance of payable to equipment suppliers (1,506,821)   (1,196,181) (1,405,931)
Less: Transfer from other non-current assets (96,713)   (305,791) (629,737)
Cash paid during the year 5,081,154 $ 154,961 3,073,881 $ 4,699,369
Related parties [member]        
Supplemental cash flow information [line items]        
Add: Beginning balance of payable to equipment suppliers 58,549      
Less: Ending balance of payable to equipment suppliers $ (21,473)   $ (58,549)