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Financial Risk Management and Fair Values of Financial Instruments - Summary of Natures of Assets and Liabilities (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value $ 132,846 $ 185,828
Foreign partnership interest [member] | Recurring fair value measurement [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through profit or loss 11,038 11,471
Foreign unlisted stocks [member] | Recurring fair value measurement [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through other comprehensive income 121,808 174,357
Level 3 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value 132,846 185,828
Level 3 [member] | Foreign partnership interest [member] | Recurring fair value measurement [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through profit or loss 11,038 11,471
Level 3 [member] | Foreign unlisted stocks [member] | Recurring fair value measurement [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through other comprehensive income $ 121,808 $ 174,357