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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, 2021
TWD ($)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
TWD ($)
shares
Dec. 31, 2019
TWD ($)
shares
Earnings per share [line items]        
Profit for the year attributable to owners of the Company $ 60,150,167 $ 2,168,353 $ 26,970,580 $ 17,060,591
Effect of potentially dilutive ordinary shares:        
Potential ordinary shares of the subsidiary (1,056,778) (38,096) (521,073) (385,865)
Earnings used in the computation of diluted earnings per share $ 59,093,389 $ 2,130,257 $ 26,449,507 $ 16,674,726
Weighted average number of ordinary shares in the computation of basic earnings per share 4,305,348 4,305,348 4,265,732 4,251,964
Effect of potentially dilutive ordinary shares:        
Employee share options 58,113 58,113 22,086 10,232
Employees' compensation 1,264 1,264 815 570
Employee restricted stock awards 943 943    
Weighted average number of ordinary shares in computation of diluted earnings per share 4,365,668 4,365,668 4,288,633 4,262,766