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Borrowings - Summary of Bank Loans (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |
Less: current portion | $ 5,112,768 | $ 170,938 | $ 10,779,034
Noncurrent portion | 135,965,830 | 4,545,832 | 127,119,295
Bank loans [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 130,085,354 | 4,349,226 | 134,799,097
Less: current portion | 5,017,970 | 167,769 | 10,779,034
Noncurrent portion | 125,067,384 | 4,181,457 | 124,020,063
Bank loans [member] | Cost [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 130,095,646 | 4,349,570 | 134,927,180
Bank loans [member] | Cost [member] | Syndicated bank loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 20,000,000 | 668,673 | 55,000,000
Bank loans [member] | Cost [member] | Other loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 105,214,824 | 3,517,714 | 75,533,354
Bank loans [member] | Cost [member] | Mortgage loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 4,880,822 | 163,183 | 4,393,826
Bank loans [member] | Net Unamortized Debt Issue Costs [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | $ 10,292 | $ 344 | $ 128,083

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- Definition The current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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