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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, 2019
TWD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
TWD ($)
shares
Dec. 31, 2017
TWD ($)
shares
Earnings per share [line items]        
Profit for the year attributable to owners of the Company $ 17,060,591 $ 570,397 $ 26,220,721 $ 22,819,119
Effect of potentially dilutive ordinary shares:        
From subsidiaries' potentially dilutive ordinary shares (385,865) (12,901) (418,295) (813,627)
From the investments in associates | $       (367,687)
From convertible bonds | $       93,781
Earnings used in the computation of diluted earnings per share $ 16,674,726 $ 557,496 $ 25,802,426 $ 21,731,586
Weighted average number of ordinary shares in the computation of basic earnings per share 4,251,964 4,251,964 4,245,247 4,080,443
Effect of potentially dilutive ordinary shares:        
From convertible bonds       62,456
From employee share options 10,232 10,232 5,103 19,934
From employees' compensation 570 570 779 21,787
Weighted average number of ordinary shares in computation of diluted earnings per share 4,262,766 4,262,766 4,251,129 4,184,620