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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, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through profit or loss $ 359,960 $ 63,488
Financial assets at fair value 744,481 325,495
Foreign partnership interests [member] | Recurring fair value measurement [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through profit or loss   10,368
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 384,521 262,007
Listed stocks [member] | Recurring fair value measurement [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through profit or loss 359,960 53,120
Level 1 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value 359,960 53,120
Level 1 [member] | Listed stocks [member] | Recurring fair value measurement [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through profit or loss 359,960 53,120
Level 3 [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value 384,521 272,375
Level 3 [member] | Foreign partnership interests [member] | Recurring fair value measurement [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Financial assets at fair value through profit or loss   10,368
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 $ 384,521 $ 262,007