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Equity - Summary of Share Capital (Detail)
shares in Thousands, $ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2018
TWD ($)
shares
Dec. 31, 2017
TWD ($)
shares
Disclosure of classes of share capital [abstract]      
Numbers of shares authorized (in thousands) 5,000,000 5,000,000 10,000,000
Numbers of shares reserved (in thousands) Employee share options 400,000 400,000 800,000
Number of shares issued and fully paid (in thousands) 4,321,714 4,321,714 8,738,079
Share capital authorized $ 1,633,453 $ 50,000,000 $ 100,000,000
Share capital reserved Employee share options 130,676 4,000,000 8,000,000
Share capital issued and fully paid $ 1,411,864 $ 43,217,144 $ 87,380,787