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Profit Before Income Tax - Summary of Finance Costs (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Total interest expense for financial liabilities measured at amortized cost | $ 2,016,298 | $ 68,026 | $ 2,510,197 | $ 2,514,208
Less: Amounts included in the cost of qualifying assets |  |  |  |
Inventories related to real estate business | (190,137) | (6,415) | (238,469) | (197,287)
Property, plant and equipment | (51,262) | (1,729) | (54,191) | (48,135)
Investment property | (13) |  |  |
Interest expense | 1,774,886 | 59,882 | 2,217,537 | 2,268,786
Other finance costs | 24,608 | 830 | 43,538 | 43,357
Finance costs | $ 1,799,494 | $ 60,712 | $ 2,261,075 | $ 2,312,143

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- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2017-01-01 -Paragraph 26 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=23&date=2017-03-01&anchor=para_26_a&doctype=Standard -URIDate 2017-03-09 + Details
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