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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, 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

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