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Business Combinations - Additional Information (Detail) - TWD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | May 31, 2016
Disclosure of subsidiaries [Line Items] |  |  |
Decrease in retained earnings due to retrospective adjustments | $ (28,880) |  |
Increase in non-controlling interests due to retrospective adjustments | 16,583 |  |
TLJ Intertech Inc. [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Percentage of shareholdings acquired by subsidiary |  | 60.00% | 60.00%
Total consideration was paid to key management personnel and related parties | $ 89,998 | $ 89,998 |
TLJ Intertech Inc. [member] | Related parties [member] |  |  |
Disclosure of subsidiaries [Line Items] |  |  |
Total consideration was paid to key management personnel and related parties |  |  | $ 41,739

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