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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
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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The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

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