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Bonds Payable - Summary of Bonds Payable (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 23,142,780 $ 780,796 $ 36,999,903
Less: current portion 6,161,197 207,868 9,658,346
Noncurrent portion 16,981,583 572,928 27,341,557
Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 23,185,600 782,240 37,760,600
Cost [member] | Repayable at maturity in January 2021 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 7,000,000 236,168 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 67,476 2,000,000
Cost [member] | Repayable at maturity in January 2022 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 3,700,000 124,831  
Cost [member] | Repayable at maturity in January 2024 [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 4,300,000 145,074  
Cost [member] | US$400,000 thousand [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable     12,900,000
Cost [member] | US$200,000 thousand [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable 6,185,600 208,691 6,185,600
Cost [member] | Secured Overseas Bonds One [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable     9,675,000
Discounts on bonds payable [member]      
Disclosure of detailed information about borrowings [line items]      
Bonds payable $ 42,820 $ 1,444 $ 760,697