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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, 2018
USD ($)
shares
Dec. 31, 2018
TWD ($)
shares
Dec. 31, 2017
TWD ($)
shares
Dec. 31, 2016
TWD ($)
shares
Earnings per share [line items]        
Profit for the year attributable to owners of the Company $ 856,606 $ 26,220,721 $ 22,819,119 $ 21,324,423
Effect of potentially dilutive ordinary shares:        
From subsidiaries (13,665) (418,295) (813,627) (374,359)
From the investments in associates | $     (367,687) (494,388)
From convertible bonds | $     93,781 (1,165,506)
Earnings used in the computation of diluted earnings per share $ 842,941 $ 25,802,426 $ 21,731,586 $ 19,290,170
Weighted average number of ordinary shares in the computation of basic earnings per share 4,245,247 4,245,247 4,080,443 3,831,435
Effect of potentially dilutive ordinary shares:        
From convertible bonds     62,456 257,648
From employee share options 5,103 5,103 19,934 29,609
From employees' compensation 779 779 21,787 23,373
Weighted average number of ordinary shares in computation of diluted earnings per share 4,251,129 4,251,129 4,184,620 4,142,065
Before Retrospectively Adjusted [member]        
Effect of potentially dilutive ordinary shares:        
Weighted average number of ordinary shares in the computation of basic earnings per share     8,160,887 7,662,870
Effect of potentially dilutive ordinary shares:        
From convertible bonds     124,911 515,295
From employee share options     39,868 59,218
From employees' compensation     43,574 46,746
Weighted average number of ordinary shares in computation of diluted earnings per share     8,369,240 8,284,129