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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

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- Definition The amount of current bonds issued and the current portion of non-current bonds issued. [Refer: Bonds issued] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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