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Financial Instruments at Fair Value Through Profit or Loss - Summary of Financial Instruments at Fair Value Through Profit or Loss (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] |  |  |
Financial assets mandatorily classified as at FVTPL | $ 5,288,996 | $ 176,830 | $ 7,898,458
Current | 4,127,566 | 137,999 | 7,262,227
Non-current | 1,161,430 | 38,831 | 636,231
Financial liabilities held for trading | 973,571 | 32,550 | 36,655
Private-placement convertible bonds [member] | Hybrid financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL |  |  | 100,496
Quoted ordinary shares [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 3,460,123 | 115,685 | 5,151,255
Open-end mutual funds [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 662,290 | 22,143 | 581,800
Forward Exchange Contract [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 104,308 | 3,487 | 32,070
Financial liabilities held for trading | 110,990 | 3,711 | 7,597
Swap contracts [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 56,561 | 1,891 | 1,557,714
Financial liabilities held for trading | 862,581 | 28,839 | 29,058
Call option [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 24,556 | 821 |
Call option [member] | Derivative financial instruments [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 24,556 | 821 |
Unquoted preferred shares [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | 377,440 | 12,619 | 275,000
Private-placement funds [member] | Non derivative financial assets [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets mandatorily classified as at FVTPL | $ 603,718 | $ 20,184 | $ 200,123

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- Definition The amount of current financial assets measured at fair value through profit or loss. [Refer: Financial assets 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 a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of current financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss, mandatorily measured at fair value] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_a&doctype=Standard -URIDate 2019-03-27 + Details
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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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- Definition The amount of non-current financial assets measured at fair value through profit or loss. [Refer: Financial assets 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 a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_a&doctype=Standard -URIDate 2019-03-27 + Details
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