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Financial Risk Management and Fair Values of Financial Instruments - Summary of Movements of Level 3 (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [Line Items]    
Movement of financial instruments beginning balance $ 272,375 $ 132,846
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) (941) (670)
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gains on valuation of financial assets at fair value through other comprehensive income 122,514 140,199
Sold in the period (9,427)  
Movement of financial instruments ending balance 384,521 272,375
Debt instruments [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Movement of financial instruments beginning balance 10,368 11,038
Gains or losses recognized in profit or loss Recorded as non-operating income (expenses) (941) (670)
Sold in the period (9,427)  
Movement of financial instruments ending balance   10,368
Equity instruments [member]    
Disclosure of detailed information about financial instruments [Line Items]    
Movement of financial instruments beginning balance 262,007 121,808
Gains or losses recognized in other comprehensive gains (losses) Recorded as unrealized gains on valuation of financial assets at fair value through other comprehensive income 122,514 140,199
Movement of financial instruments ending balance $ 384,521 $ 262,007