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Profit Before Income Tax - Additional Information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2019
TWD ($)
Apr. 30, 2019
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Analysis of income and expense [Line Items]          
Percentage of employees' compensation     0.20% 0.20% 0.20%
Percentage of remuneration to directors     0.40% 0.40% 0.15%
Gain recognized from remeasuring fair value of equity interest before business combination $ 243,057 $ 8,126,000      
Difference Between Employee Compensation Benefits And Director Remuneration Adjusted In Net Profit     $ 3 $ 100  
Siliconware Precision Industries Co., Ltd. [member]          
Analysis of income and expense [Line Items]          
Gain recognized from remeasuring fair value of equity interest before business combination         $ 7,421,408
Bottom of range [member]          
Analysis of income and expense [Line Items]          
Percentage of employees' compensation     0.01% 0.01%  
Top of range [member]          
Analysis of income and expense [Line Items]          
Percentage of employees' compensation     1.00% 1.00%  
Percentage of remuneration to directors     0.75% 0.75%