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Equity - Summary of Share Capital (Detail) shares in Thousands, $ in Thousands, $ in Thousands | Dec. 31, 2017 TWD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 TWD ($) shares
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Disclosure of classes of share capital [abstract] |  |  |
Numbers of shares authorized (in thousands) | 10,000,000 | 10,000,000 | 10,000,000
Numbers of shares reserved (in thousands) Employee share options | 800,000 | 800,000 | 800,000
Number of shares issued and fully paid (in thousands) | 8,738,079 | 8,738,079 | 7,946,184
Share capital authorized | $ 100,000,000 | $ 3,373,819 | $ 100,000,000
Share capital reserved Employee share options | 8,000,000 | 269,906 | 8,000,000
Share capital issued | $ 87,380,787 | $ 2,948,070 | $ 79,568,040

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