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Income Tax - Summary of Current Tax Assets and Liabilities (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | ---
Current tax assets |  |  |
Tax refund receivable | $ 1,648 | $ 50,456 | $ 28,458
Prepaid income tax | 15,479 | 473,807 | 232,084
Current tax assets | 17,127 | 524,263 | 260,542
Current tax liabilities |  |  |
Income tax payable | $ 221,533 | $ 6,781,136 | $ 7,619,328

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