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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, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items]      
Inventories related to real estate business $ 13,471,645 $ 479,760 $ 11,416,726
Land and buildings held for sale [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Inventories related to real estate business 625,791 22,286 9,983
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 11,058,328 393,815 9,619,217
Land held for construction [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Inventories related to real estate business $ 1,787,526 $ 63,659 $ 1,787,526