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Borrowings - Summary of Bank Loans (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] |  |  |
Less: current portion | $ 352,141 | $ 10,779,034 | $ 8,261,625
Noncurrent portion | 4,152,868 | 127,119,295 | 27,145,003
Bank loans [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 4,403,760 | 134,799,097 | 33,407,496
Less: current portion | 352,141 | 10,779,034 | 8,261,625
Noncurrent portion | 4,051,619 | 124,020,063 | 25,145,871
Bank loans [member] | Cost [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 4,407,944 | 134,927,180 | 33,408,696
Bank loans [member] | Cost [member] | Syndicated bank loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 1,796,798 | 55,000,000 | 4,761,600
Bank loans [member] | Cost [member] | Other loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 2,467,604 | 75,533,354 | 23,941,947
Bank loans [member] | Cost [member] | Mortgage loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 143,542 | 4,393,826 | 4,705,149
Bank loans [member] | Net Unamortized Debt Issue Costs [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | $ 4,184 | $ 128,083 | $ 1,200

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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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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