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Financial Instruments - Summary of Categories of Financial Instruments (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Mandatorily at FVTPL | $ 5,288,996 | $ 176,830 | $ 7,898,458
Trade receivables, net | 78,948,473 | 2,639,534 | 79,481,359
Held for trading | 973,571 | 32,550 | 36,655
Financial liabilities for hedging | 3,233,301 | 108,101 | 3,899,634
Measured at amortized cost (Note 2) | 310,187,110 | 10,370,681 | 286,035,732
Mandatorily at fair value through profit or loss [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Measured at amortized cost | 139,668,804 | 4,669,636 | 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 | 755,903 | 25,272 | 580,399
Debt instruments | 1,014,872 | 33,931 | $ 1,016,924
Trade receivables, net | $ 2,029,690 | $ 67,860 |

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- Definition The amount of current financial liabilities at fair value through profit or loss that meet the definition of held for trading. [Refer: Current financial liabilities at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_e&doctype=Standard -URIDate 2019-03-27 + Details
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