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Available-for-sale Financial Assets - Summary of Available-for-sale Financial Assets (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of financial assets [Line Items]      
Available-for-sale financial assets $ 1,212,165 $ 40,896 $ 1,295,034
Current 89,159 3,008 266,696
Non-current 1,123,006 37,888 1,028,338
Unquoted ordinary shares [member]      
Disclosure of financial assets [Line Items]      
Available-for-sale financial assets 605,110 20,415 553,350
Quoted ordinary shares [member]      
Disclosure of financial assets [Line Items]      
Available-for-sale financial assets 279,791 9,440 146,786
Limited partnership [member]      
Disclosure of financial assets [Line Items]      
Available-for-sale financial assets 246,072 8,302 273,372
Unquoted preferred shares [member]      
Disclosure of financial assets [Line Items]      
Available-for-sale financial assets 57,367 1,935 78,068
Open-end mutual funds [member]      
Disclosure of financial assets [Line Items]      
Available-for-sale financial assets $ 23,825 $ 804 $ 243,458