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Segment Information - Schedule of Geographical Information (Detail) - TWD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Non-current assets [abstract] |  |
Total non-current assets | $ 18,925,463 | $ 18,733,638
ROC [member] |  |
Non-current assets [abstract] |  |
Total non-current assets | 18,913,501 | 18,727,979
PRC [member] |  |
Non-current assets [abstract] |  |
Total non-current assets | 117 |
Others [Member] |  |
Non-current assets [abstract] |  |
Total non-current assets | $ 11,845 | $ 5,659

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