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Available-for-sale Financial Assets (Tables)
 12 Months Ended
Dec. 31, 2017
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Summary of Available-for-sale Financial Assets
    December 31
    2016   2017
    NT$   NT$   US$ (Note 4)
             
Unquoted ordinary shares   $ 553,350     $ 605,110     $ 20,415  
Quoted ordinary shares     146,786       279,791       9,440  
Limited partnership     273,372       246,072       8,302  
Unquoted preferred shares     78,068       57,367       1,935  
Open-end mutual funds     243,458       23,825       804  
      1,295,034       1,212,165       40,896  
Current     266,696       89,159       3,008  
                         
Non-current   $ 1,028,338     $ 1,123,006     $ 37,888