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Financial Risk Management and Fair Values of Financial Instruments - Information on Assets and Liabilities Denominated in Foreign Currencies whose Values would be Materially Affected by Exchange Rate Fluctuations (Detail) ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) $ / JPY $ / USD $ / CNY | Dec. 31, 2021 USD ($) $ / JPY $ / USD $ / CNY | Dec. 31, 2021 JPY (¥) $ / JPY $ / USD $ / CNY | Dec. 31, 2021 CNY (¥) $ / JPY $ / USD $ / CNY | Dec. 31, 2020 TWD ($) $ / JPY $ / CNY $ / USD | Dec. 31, 2020 USD ($) $ / JPY $ / CNY $ / USD | Dec. 31, 2020 JPY (¥) $ / JPY $ / CNY $ / USD | Dec. 31, 2020 CNY (¥) $ / JPY $ / CNY $ / USD
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Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Assets denominated in foreign currencies | $ | $ 13,170,873 |  |  |  | $ 10,131,324 |  |  |
Exchange rate | 27.74 | 27.74 | 27.74 | 27.74 |  |  |  |
Currency Risk [member] | US$ [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Assets denominated in foreign currencies | $ 5,207,798 | $ 188,143 |  |  | 5,007,923 | $ 175,840 |  |
Liabilities denominated in foreign currencies | $ 1,468,203 | $ 53,042 |  |  | $ 752,157 | $ 26,410 |  |
Currency Risk [member] | US$ [member] | Financial Liability [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Exchange rate | $ / USD | 27.6800 | 27.6800 | 27.6800 | 27.6800 | 28.4800 | 28.4800 | 28.4800 | 28.4800
Currency Risk [member] | US$ [member] | Financial Asset [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Exchange rate | $ / USD | 27.6800 | 27.6800 | 27.6800 | 27.6800 | 28.4800 | 28.4800 | 28.4800 | 28.4800
Currency Risk [member] | JPY [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Assets denominated in foreign currencies | $ 34,036 |  | ¥ 141,523 |  | $ 38,029 |  | ¥ 137,635 |
Liabilities denominated in foreign currencies | $ 262,005 |  | ¥ 1,089,668 |  | $ 425,016 |  | ¥ 1,538,241 |
Currency Risk [member] | JPY [member] | Financial Liability [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Exchange rate | 0.2405 | 0.2405 | 0.2405 | 0.2405 | 0.2763 | 0.2763 | 0.2763 | 0.2763
Currency Risk [member] | JPY [member] | Financial Asset [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Exchange rate | 0.2405 | 0.2405 | 0.2405 | 0.2405 | 0.2763 | 0.2763 | 0.2763 | 0.2763
Currency Risk [member] | RMB [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Assets denominated in foreign currencies | $ 21,477 |  |  | ¥ 4,944 | $ 29,930 |  |  | ¥ 6,838
Currency Risk [member] | RMB [member] | Financial Asset [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Exchange rate | $ / CNY | 4.3440 | 4.3440 | 4.3440 | 4.3440 | 4.3770 | 4.3770 | 4.3770 | 4.3770
Other Risks [Member] | JPY [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Assets denominated in foreign currencies | $ 384,521 |  | ¥ 1,598,839 |  | $ 262,007 |  | ¥ 948,270 |
Other Risks [Member] | JPY [member] | Financial Asset [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Exchange rate | 0.2405 | 0.2405 | 0.2405 | 0.2405 | 0.2763 | 0.2763 | 0.2763 | 0.2763
Other Risks [Member] | RMB [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Assets denominated in foreign currencies | $ 3,596,012 |  |  | ¥ 827,811 | $ 3,020,908 |  |  | ¥ 690,178
Other Risks [Member] | RMB [member] | Financial Asset [member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Exchange rate | $ / CNY | 4.3440 | 4.3440 | 4.3440 | 4.3440 | 4.3770 | 4.3770 | 4.3770 | 4.3770

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
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