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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, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of detailed information about property, plant and equipment [Line Items]      
Inventories related to real estate business $ 9,819,516 $ 331,293 $ 24,187,515
Land and buildings held for sale [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Inventories related to real estate business 25,825 871 263,526
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 8,106,166 273,488 22,236,464
Land held for construction [member]      
Disclosure of detailed information about property, plant and equipment [Line Items]      
Inventories related to real estate business $ 1,687,525 $ 56,934 $ 1,687,525