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Bonds Payable - Summary of Bonds Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 56,253,554 $ 2,003,332 $ 36,522,155
Noncurrent portion 49,253,603 1,754,046 36,272,155
Less: current portion of bonds payable 6,999,951 249,286 250,000
Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 56,307,200 2,005,242 36,557,200
Cost [member] | Repayable at maturity in January 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 7,000,000 249,288 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 71,225 2,000,000
Cost [member] | Repayable at maturity in January 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,700,000 131,766 3,700,000
Cost [member] | Repayable at maturity in January 2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 4,300,000 153,134 4,300,000
Cost [member] | Repayable at maturity in April 2024 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 6,500,000 231,481 6,500,000
Cost [member] | Repayable at maturity in April 2026 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,500,000 124,644 3,500,000
Cost [member] | Repayable at maturity in April 2025 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 10,000,000 356,125  
Cost [member] | Repayable at maturity in October 2022 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 6,204,800 220,969 6,204,800
Cost [member] | Repayable at maturity in October 2024 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,102,400 110,484 3,102,400
Cost [member] | Repayable at maturity in December 2020 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 0 0 250,000
Cost [member] | Repayable at maturity in August 2023 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,000,000 106,838  
Cost [member] | Repayable at maturity in August 2025 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 5,000,000 178,063  
Cost [member] | Repayable at maturity in August 2027 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 2,000,000 71,225  
Discounts on bonds payable [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 53,646 $ 1,910 $ 35,045