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Segment Information - Geographic Information of Revenue (Detail) $ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)
Disclosure of geographical areas [Line Items]
Revenue	$ 20,337,881	$ 679,969	$ 18,480,027	$ 17,940,855
ROC [member]
Disclosure of geographical areas [Line Items]
Revenue	15,875,027		14,751,766	13,152,419
Japan [member]
Disclosure of geographical areas [Line Items]
Revenue	1,905,032		1,825,479	2,257,296
Singapore [member]
Disclosure of geographical areas [Line Items]
Revenue	1,333,114		1,143,661	1,798,585
People's Republic of China ("PRC") [member]
Disclosure of geographical areas [Line Items]
Revenue	789,496		163,831	162,579
Others [member]
Disclosure of geographical areas [Line Items]
Revenue	$ 435,212		$ 595,290	$ 569,976

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Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: 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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