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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, 2019 TWD ($) $ / ¥ $ / $ $ / ¥	Dec. 31, 2019 USD ($) $ / ¥ $ / $ $ / ¥	Dec. 31, 2019 JPY (¥) $ / ¥ $ / $ $ / ¥	Dec. 31, 2019 CNY (¥) $ / ¥ $ / $ $ / ¥	Dec. 31, 2018 TWD ($) $ / ¥ $ / $ $ / ¥	Dec. 31, 2018 USD ($) $ / ¥ $ / $ $ / ¥	Dec. 31, 2018 JPY (¥) $ / ¥ $ / $ $ / ¥	Dec. 31, 2018 CNY (¥) $ / ¥ $ / $ $ / ¥
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies | $	$ 9,642,833				$ 9,932,223
Exchange rate	29.91	29.91	29.91	29.91
Currency Risk [member] | US$ [member]
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies	$ 5,647,303	$ 188,369			5,229,843	$ 170,270
Liabilities denominated in foreign currencies	$ 235,853	$ 7,867			$ 559,934	$ 18,230
Currency Risk [member] | US$ [member] | Financial Liability [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate | $ / $	29.9800	29.9800	29.9800	29.9800	30.7150	30.7150	30.7150	30.7150
Currency Risk [member] | US$ [member] | Financial Asset [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate | $ / $	29.9800	29.9800	29.9800	29.9800	30.7150	30.7150	30.7150	30.7150
Currency Risk [member] | JPY [member]
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies	$ 73,642		¥ 266,819		$ 49,396		¥ 177,557
Liabilities denominated in foreign currencies	$ 285,217		¥ 1,033,394		$ 677,734		¥ 2,436,140
Currency Risk [member] | JPY [member] | Financial Liability [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate	0.2760	0.2760	0.2760	0.2760	0.2782	0.2782	0.2782	0.2782
Currency Risk [member] | JPY [member] | Financial Asset [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate	0.2760	0.2760	0.2760	0.2760	0.2782	0.2782	0.2782	0.2782
Currency Risk [member] | RMB [member]
Disclosure of detailed information about financial instruments [Line Items]
Assets denominated in foreign currencies	$ 26,678			¥ 6,197	$ 39,577			¥ 8,850
Currency Risk [member] | RMB [member] | Financial Asset [member]
Disclosure of detailed information about financial instruments [Line Items]
Exchange rate	4.3050	4.3050	4.3050	4.3050	4.4720	4.4720	4.4720	4.4720

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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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