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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Financial assets at fair value through other comprehensive income [line items]        
Balance at January 1 $ 2,019,812      
Other comprehensive income for the year, net of income tax 8,632,472 $ 280,913 $ 406,016 $ 495,313
Ending balance 1,542,271 50,188 2,019,812  
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 4,190,361 136,361 2,027,902 (203,098)
Unrealized gain (loss) recognized during the year Debt instruments (16,746) (545) 63,722 (2,136)
Equity instruments (8,360) (272) (8,671) (405,020)
Share from associates and joint ventures accounted for using the equity method (2,928,173) (95,287) 3,599,703 2,655,570
Other comprehensive income for the year, net of income tax (2,953,279) (96,104) 3,654,754 2,248,414
Disposal of associates and joint ventures accounted for using the equity method       1,094
Cumulative unrealized loss of equity instruments transferred to retained earnings due to disposal 190,500 6,199 33,258 16,383
Cumulative unrealized gain transferred to retained earnings due to disposal of equity instruments in relation to associates and joint venture accounted for using the equity method (152,077) (4,949) (1,525,553) (34,891)
Ending balance $ 1,275,505 $ 41,507 $ 4,190,361 $ 2,027,902