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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, 2020 TWD ($) $ / JPY $ / USD $ / CNY	Dec. 31, 2020 USD ($) $ / JPY $ / USD $ / CNY	Dec. 31, 2020 JPY (¥) $ / JPY $ / USD $ / CNY	Dec. 31, 2020 CNY (¥) $ / JPY $ / USD $ / CNY	Dec. 31, 2019 TWD ($) $ / JPY $ / USD $ / CNY	Dec. 31, 2019 USD ($) $ / JPY $ / USD $ / CNY	Dec. 31, 2019 JPY (¥) $ / JPY $ / USD $ / CNY	Dec. 31, 2019 CNY (¥) $ / JPY $ / USD $ / CNY
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies | $	$ 10,131,324				$ 9,642,833
Exchange rate	28.08	28.08	28.08	28.08
Currency Risk [member] | US$ [member]
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies	$ 5,007,923	$ 175,840			5,647,303	$ 188,369
Liabilities denominated in foreign currencies	$ 752,157	$ 26,410			$ 235,853	$ 7,867
Currency Risk [member] | US$ [member] | Financial Liability [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate | $ / USD	28.4800	28.4800	28.4800	28.4800	29.9800	29.9800	29.9800	29.9800
Currency Risk [member] | US$ [member] | Financial Asset [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate | $ / USD	28.4800	28.4800	28.4800	28.4800	29.9800	29.9800	29.9800	29.9800
Currency Risk [member] | JPY [member]
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies	$ 38,029		¥ 137,635		$ 73,642		¥ 266,819
Liabilities denominated in foreign currencies	$ 425,016		¥ 1,538,241		$ 285,217		¥ 1,033,394
Currency Risk [member] | JPY [member] | Financial Liability [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate | $ / JPY	0.2763	0.2763	0.2763	0.2763	0.2760	0.2760	0.2760	0.2760
Currency Risk [member] | JPY [member] | Financial Asset [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate | $ / JPY	0.2763	0.2763	0.2763	0.2763	0.2760	0.2760	0.2760	0.2760
Currency Risk [member] | RMB [member]
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies	$ 29,930			¥ 6,838	$ 26,678			¥ 6,197
Currency Risk [member] | RMB [member] | Financial Asset [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate | $ / CNY	4.3770	4.3770	4.3770	4.3770	4.3050	4.3050	4.3050	4.3050
Other Risks [Member] | JPY [member]
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies	$ 262,007		¥ 948,270		$ 121,808		¥ 441,334
Other Risks [Member] | JPY [member] | Financial Asset [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate	0.2763	0.2763	0.2763	0.2763	0.2760	0.2760	0.2760	0.2760
Other Risks [Member] | RMB [member]
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies	$ 3,020,908			¥ 690,178	$ 3,143,117	$ 730,108
Other Risks [Member] | RMB [member] | Financial Asset [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate | $ / CNY	4.3770	4.3770	4.3770	4.3770	4.3050	4.3050	4.3050	4.3050

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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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