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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, 2017
TWD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
TWD ($)
shares
Dec. 31, 2015
TWD ($)
shares
Earnings per share [abstract]        
Profit for the year attributable to owners of the Company $ 22,819,119 $ 769,876 $ 21,324,423 $ 19,732,148
Effect of potentially dilutive ordinary shares:        
Employee share options issued by subsidiaries (813,627) (27,450) (374,359)  
Investments in associates (367,687) (12,405) (494,388) (210,126)
Convertible bonds 93,781 3,164 (1,165,506) 901,187
Earnings used in the computation of diluted earnings per share $ 21,731,586 $ 733,185 $ 19,290,170 $ 20,423,209
Weighted average number of ordinary shares in computation of basic earnings per share 8,160,887 8,160,887 7,662,870 7,652,773
Effect of potentially dilutive ordinary shares:        
Convertible bonds 124,911 124,911 515,295 455,671
Employee share options 39,868 39,868 59,218 86,994
Employees' compensation 43,574 43,574 46,746 54,626
Weighted average number of ordinary shares in computation of diluted earnings per share 8,369,240 8,369,240 8,284,129 8,250,064