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Operating Segments Information - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Disclosure of operating segments [line items] |  |  |  |
Operating revenue | $ 12,123,242 | $ 371,092,421 | $ 290,441,208 | $ 274,884,107
Packaging and EMS segments [member] | Customer One [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Operating revenue | $ 3,009,403 | $ 92,117,839 | $ 83,873,393 | $ 66,554,659

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