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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

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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 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The non-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 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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