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Business Combinations - Summary of Subsidiary Acquired (Detail) - TLJ Intertech Inc. [member] - TWD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2016
Disclosure of detailed information about business combination [Line Items] |  |  |
Principal Activity | Engaged in information software services |  |
Date of Acquisition | May 03, 2016 |  |
Proportion of Voting Equity Interests Acquired | 60.00% |  | 60.00%
Cash Consideration | $ 89,998 | $ 89,998 |

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