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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
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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

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