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Inventories Related to Real Estate Business - Summary of Inventories Related to Real Estate Business (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items]
Inventories related to real estate business	$ 328,671	$ 10,060,608	$ 9,819,516
Land and buildings held for sale [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Inventories related to real estate business	677	20,734	25,825
Construction in progress and machinery in transit [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Inventories related to real estate business	269,597	8,252,348	8,106,166
Land held for construction [member]
Disclosure of detailed information about property, plant and equipment [Line Items]
Inventories related to real estate business	$ 58,397	$ 1,787,526	$ 1,687,525