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Significant Assets and Liabilities Denominated in Foreign Currencies - Summary of Significant Assets and Liabilities Denominated in Foreign Currencies (Detail) ¥ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018	Dec. 31, 2020 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 HKD ($)	Dec. 31, 2020 JPY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2019 JPY (¥)
US Dollar [member] | US dollar equals to New Taiwan dollar [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 121,583,265	$ 123,693,628		$ 4,269,075				$ 4,125,872
Financial liabilities	$ 126,448,786	$ 114,624,313		4,439,915				3,823,359
Exchange Rate	US$1=NT$28.48	US$1=NT$29.98	US$1=NT$30.715
Exchange Rate	US$1=NT$28.48	US$1=NT$29.98	US$1=NT$30.715
US Dollar [member] | US dollar equals to Chinese yuan [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets				1,527,381	¥ 43,499,803			1,189,539	¥ 35,662,384
Financial liabilities				1,517,568	43,220,325			1,211,472	¥ 36,319,926
Exchange Rate	US$1=RMB6.5249	US$1=RMB6.9762
Exchange Rate	US$1=RMB6.5249	US$1=RMB6.9762
US Dollar [member] | EUR equals to US dollar [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets				41,643	1,185,984
Financial liabilities				20,896	595,128
Exchange Rate	EUR1=US$0.8143
Exchange Rate	EUR1=US$0.8143
Japanese Yen [Member] | Japanese yen equals to New Taiwan dollar [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 3,742,306	$ 3,833,605					¥ 13,544,360			¥ 13,889,872
Financial liabilities		$ 4,037,478			¥ 3,773,695		13,657,967			14,628,543
Exchange Rate	JPY1=NT$0.2763	JPY1=NT$0.2760
Exchange Rate	JPY1=NT$0.2763	JPY1=NT$0.2760
Japanese Yen [Member] | Japanese yen equals to US dollar [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets				324,434			1,174,208	212,904		771,392
Financial liabilities				$ 328,424			¥ 1,188,650	$ 225,197		¥ 815,929
Exchange Rate	JPY1=US$0.0097	JPY1=US$0.0092
Exchange Rate	JPY1=US$0.0097	JPY1=US$0.0092
Hong Kong, Dollars | HK dollar equal to New Taiwan dollar [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	$ 641,912					$ 174,765
Financial liabilities	$ 69,103					$ 18,814
Exchange Rate	HKD1=NT$3.6730
Exchange Rate	HKD1=NT$3.6730

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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]

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