The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details

Segment Information - Geographic Information of Revenue (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Disclosure of geographical areas [Line Items]
Revenue	$ 23,011,381	$ 819,493	$ 20,337,881	$ 18,480,027
ROC [member]
Disclosure of geographical areas [Line Items]
Revenue	18,341,726		15,875,027	14,751,766
Japan [member]
Disclosure of geographical areas [Line Items]
Revenue	1,291,026		1,905,032	1,825,479
Singapore [member]
Disclosure of geographical areas [Line Items]
Revenue	1,838,394		1,333,114	1,143,661
People's Republic of China ("PRC") [member]
Disclosure of geographical areas [Line Items]
Revenue	1,105,535		789,496	163,831
Others [member]
Disclosure of geographical areas [Line Items]
Revenue	$ 434,700		$ 435,212	$ 595,290