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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, 2024
TWD ($)
shares
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
TWD ($)
shares
Dec. 31, 2022
TWD ($)
shares
Earnings per share [line items]        
Profit for the year attributable to owners of the Company $ 32,378,936 $ 987,464 $ 35,457,908 $ 61,501,545
Effect of potentially dilutive ordinary shares:        
Potential ordinary shares of the subsidiary (747,333) (22,791) (494,272) (1,811,449)
Earnings used in the computation of diluted earnings per share $ 31,631,603 $ 964,673 $ 34,963,636 $ 59,690,096
Weighted average number of ordinary shares in the computation of basic earnings per share 4,318,991 4,318,991 4,295,871 4,274,687
Effect of potentially dilutive ordinary shares:        
Employee share options 70,534 70,534 42,045 40,351
Employees' compensation 623 623 924 1,940
Employee restricted stock awards 1,865 1,865 8,830 6,445
Weighted average number of ordinary shares in the computation of diluted earnings per share 4,392,013 4,392,013 4,347,670 4,323,423