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Bonds Payable - Summary of Bonds Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 554,915 $ 16,985,936 $ 23,142,780
Less: current portion     6,161,197
Noncurrent portion 554,915 16,985,936 16,981,583
Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 555,374 17,000,000 23,185,600
Cost [member] | Repayable at maturity in January 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 228,683 7,000,000 7,000,000
Cost [member] | Repayable at maturity in January 2023 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 65,338 2,000,000 2,000,000
Cost [member] | Repayable at maturity in January 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 120,876 3,700,000 3,700,000
Cost [member] | Repayable at maturity in January 2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 140,477 4,300,000 4,300,000
Cost [member] | US$200,000 thousand [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable     6,185,600
Discounts on bonds payable [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 459 $ 14,064 $ 42,820