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Inventories Related to Real Estate Business - Additional Information (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 TWD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2020 TWD ($)
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Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |  |
Inventories related to real estate business expected to be recovered longer than twelve months | $ 5,412,114 | $ 195,102 |  |  | $ 13,471,645
Land Held For Construction [member] | Construction in progress [member] |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [Line Items] |  |  |  |  |
Inventories related to real estate business expected to be recovered longer than twelve months |  |  | $ 9,722,579 | $ 350,490 |

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