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Borrowings - Summary of Bank Loans (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Disclosure of detailed information about borrowings [line items] |  |  |
Less: current portion | $ 8,261,625 | $ 278,732 | $ 6,567,565
Noncurrent portion | 27,145,003 | 915,823 | 46,547,998
Bank loans [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 31,907,496 | 1,076,501 | 49,616,222
Less: current portion | 6,761,625 | 228,125 | 6,567,565
Noncurrent portion | 25,145,871 | 848,376 | 43,048,657
Bank loans [member] | Cost [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 31,908,696 | 1,076,541 | 49,623,420
Bank loans [member] | Cost [member] | Syndicated bank loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 4,761,600 | 160,647 | 9,223,500
Bank loans [member] | Cost [member] | Other loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 22,441,947 | 757,151 | 36,009,917
Bank loans [member] | Cost [member] | Mortgage loans [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | 4,705,149 | 158,743 | 4,390,003
Bank loans [member] | Net Unamortized Debt Issue Costs [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term borrowings | $ 1,200 | $ 40 | $ 7,198

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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 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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