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Equity - Summary of Unrealized Gain (Loss) on Financial Assets at FVTOCI (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Financial assets at fair value through other comprehensive income [line items]        
Balance at January 1 $ 1,741,134      
Ending balance 2,019,812 $ 72,812 $ 1,741,134  
Unrealized gain (loss) on financial assets at fair value through other comprehensive income [member]        
Financial assets at fair value through other comprehensive income [line items]        
Balance at January 1 2,027,902 73,104 (203,098) $ (1,015,107)
Debt instruments 63,722 2,297 (2,136) (2,052)
Equity instruments (8,671) (313) (405,020) (283,472)
Share from associates and joint venture accounted for using the equity method 3,599,703 129,766 2,655,570 1,501,689
Disposal of associates and joint venture accounted for using the equity method     1,094  
Cumulative unrealized loss of equity instruments transferred to retained earnings due to disposal 33,258 1,199 16,383  
Cumulative unrealized loss transferred to retained earnings due to disposal of equity instruments in relation to associates and joint venture accounted for using the equity method (1,525,553) (54,995) (34,891) (404,156)
Ending balance $ 4,190,361 $ 151,058 $ 2,027,902 $ (203,098)