v3.26.1
Bonds Payable - Summary of Bonds Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2025
TWD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 14,967,630 $ 477,132 $ 32,976,164
Less: current portion of bonds payable 3,499,748 111,564 14,997,976
Noncurrent portion 11,467,882 365,568 17,978,188
Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 14,637,581 466,611 32,717,010
Cost [member] | Repayable at maturity in April 2026 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,500,000 111,572 3,500,000
Cost [member] | Repayable at maturity in April 2025 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable     10,000,000
Cost [member] | Repayable at maturity in August 2025 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable     5,000,000
Cost [member] | Repayable at maturity in August 2027 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 2,000,000 63,755 2,000,000
Cost [member] | Repayable at maturity in March 2027 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 9,137,581 291,284 12,217,010
Premiums on bonds payable [member]      
Disclosure of detailed information about borrowings [line items]      
Add: premiums on bonds payable $ 330,049 $ 10,521 $ 259,154