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Bonds Payable - Summary of Bonds Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 52,267,337 $ 1,884,187 $ 56,253,554
Noncurrent portion 42,364,627 1,527,204 49,253,603
Less: current portion of bonds payable 9,902,710 356,983 6,999,951
Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 52,692,581 1,899,517 56,307,200
Cost [member] | Repayable at maturity in January 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 0 0 7,000,000
Cost [member] | Repayable at maturity in January 2023 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 2,000,000 72,098 2,000,000
Cost [member] | Repayable at maturity in January 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,700,000 133,381 3,700,000
Cost [member] | Repayable at maturity in January 2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 4,300,000 155,011 4,300,000
Cost [member] | Repayable at maturity in April 2024 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 6,500,000 234,319 6,500,000
Cost [member] | Repayable at maturity in April 2026 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,500,000 126,172 3,500,000
Cost [member] | Repayable at maturity in April 2025 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 10,000,000 360,490 10,000,000
Cost [member] | Repayable at maturity in October 2022 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 6,204,800 223,677 6,204,800
Cost [member] | Repayable at maturity in October 2024 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,102,400 111,839 3,102,400
Cost [member] | Repayable at maturity in August 2023 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,000,000 108,147 3,000,000
Cost [member] | Repayable at maturity in August 2025 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 5,000,000 180,245 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 72,098 2,000,000
Cost [member] | Repayable at Maturity in March 2027 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,385,381 122,040  
Discounts on bonds payable [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 425,244 $ 15,330 $ 53,646