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Profit Before Income Tax - Additional Information (Detail)
$ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
Analysis of income and expense [Line Items]          
Percentage of employees' compensation   8.25% 8.25% 8.25% 8.25%
Percentage of remuneration to directors   0.75% 0.75% 0.75% 0.75%
Difference between paid and recognized value of employees' compensation and remuneration to directors   $ 42,634 $ 1,438 $ 44,200  
Bottom of range [member]          
Analysis of income and expense [Line Items]          
Percentage of employees' compensation 5.25%        
Top of range [member]          
Analysis of income and expense [Line Items]          
Percentage of employees' compensation 8.25%