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Bonds Payable - Summary of Bonds Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 36,522,155 $ 1,221,068 $ 16,985,936
Noncurrent portion 36,272,155 1,212,710 16,985,936
Less: current portion of bonds payable 250,000 8,358 0
Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 36,557,200 1,222,240 17,000,000
Cost [member] | Repayable at maturity in January 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 7,000,000 234,035 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 66,867 2,000,000
Cost [member] | Repayable at maturity in January 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,700,000 123,704 3,700,000
Cost [member] | Repayable at maturity in January 2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 4,300,000 143,765 4,300,000
Cost [member] | Repayable at maturity in April 2024 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 6,500,000 217,319 0
Cost [member] | Repayable at maturity in April 2026 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,500,000 117,018 0
Cost [member] | Repayable at maturity in October 2022 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 6,204,800 207,449 0
Cost [member] | Repayable at maturity in October 2024 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,102,400 103,725 0
Cost [member] | Repayable at maturity in December 2020 [Member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 250,000 8,358 0
Discounts on bonds payable [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 35,045 $ 1,172 $ 14,064