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Financial Instruments - Summary of Categories of Financial Instruments (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets designated as at FVTPL |  |  | $ 100,496
Held for trading |  |  | 5,122,571
Mandatorily at FVTPL | $ 258,035 | $ 7,898,458 |
Available-for-sale financial assets |  |  | 1,212,165
Held for trading | 1,197 | 36,655 | 677,430
Financial liabilities for hedging | 127,397 | 3,899,634 |
Measured at amortized cost (Note 2) | 9,344,520 | 286,035,732 | 139,561,999
Mandatorily at fair value through profit or loss [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Available-for-sale financial assets |  |  | 1,212,165
Loans and receivables |  |  | $ 103,973,567
Measured at amortized cost | 4,569,314 | 139,866,736 |
Financial assets at fair value through other comprehensive income, category [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Equity instruments | 18,961 | 580,399 |
Debt instruments | $ 33,222 | $ 1,016,924 |

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- Definition The amount of current financial assets measured at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading] + 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_a&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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