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Earnings Per Share - Summary of Earnings and Weighted Average Number of Ordinary Shares Outstanding in Computation of Earnings Per Share (Detail)
shares in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
TWD ($)
shares
Dec. 31, 2020
TWD ($)
shares
Earnings per share [line items]        
Profit for the year attributable to owners of the Company $ 61,501,545 $ 2,001,352 $ 60,150,167 $ 26,970,580
Effect of potentially dilutive ordinary shares:        
Potential ordinary shares of the subsidiary (1,811,449) (58,947) (1,056,778) (521,073)
Earnings used in the computation of diluted earnings per share $ 59,690,096 $ 1,942,405 $ 59,093,389 $ 26,449,507
Weighted average number of ordinary shares in the computation of basic earnings per share 4,274,687 4,274,687 4,305,348 4,265,732
Effect of potentially dilutive ordinary shares:        
Employee share options 40,351 40,351 58,113 22,086
Employees' compensation 1,940 1,940 1,264 815
Employee restricted stock awards 6,445 6,445 943  
Weighted average number of ordinary shares in computation of diluted earnings per share 4,323,423 4,323,423 4,365,668 4,288,633