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Inventories Related to Real Estate Business (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Inventories Related to Real Estate Business
    December 31
    2017   2018
    NT$   NT$   US$ (Note 4)
             
Land and buildings held for sale   $ 25,825     $ 20,734     $ 677  
Construction in progress     8,106,166       8,252,348       269,597  
Land held for construction     1,687,525       1,787,526       58,397  
    $ 9,819,516     $ 10,060,608     $ 328,671