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Profit Before Income Tax - Summary of Other Gains and Losses (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] |  |  |  |
Gain on disposal of subsidiaries (Note 29) | $ 5,589,457 | $ 188,578 |  |
Net gain (loss) arising on financial instruments held for trading | (3,111,253) | (104,968) | $ 224,446 | $ 1,657,093
Net gain on financial assets designated as at FVTPL | 327,351 | 11,044 | 223,113 | 815,742
Foreign exchange gain or loss, net | 3,502,586 | 118,171 | 1,928,384 | (713,213)
Impairment loss on financial assets | (50,206) | (1,694) | (91,886) |
Others | 1,518 | 52 | (7,513) | (10,827)
Other gains and losses | $ 6,259,453 | $ 211,183 | $ 2,276,544 | $ 1,748,795

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- Definition Gains losses on financial assets and liabilities at fair value through profit or loss classified as held for trading. + References No definition available. + Details
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- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=sect_AStatementofcashflowsforanentityotherthanafinancialinstitution&doctype=Illustrative%20Examples -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2017-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2017-03-01&anchor=para_52_a&doctype=Standard -URIDate 2017-03-09 + Details
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