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Goodwill - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Percentage of cash flows growth rate beyond five-year period | 2.00% | 2.00% | 2.00% | 2.00%
Impairment loss on goodwill | $ 425,117 | $ 14,343 |  |
Bottom of range [member] |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate applied to cash flow projections | 8.97% | 8.97% | 9.09% | 8.67%
Top of range [member] |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Discount rate applied to cash flow projections | 11.29% | 11.29% | 10.49% | 10.71%

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- Definition The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_iv&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d_v&doctype=Appendix&seq=2 -URIDate 2017-03-09 + Details
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