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Borrowings - Summary of Bills Payable (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($)
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | $ 8,498,647 | $ 306,368 | $ 4,998,502
Unamortized Discounts [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 1,353 | 49 | 1,498
Longterm Bills Payable [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 8,500,000 | 306,417 | 5,000,000
Ta Ching Bills Finance Corporation [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 2,500,000 | 90,123 | 1,000,000
Mega Bills Finance Corporation [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 2,000,000 | 72,098 | 2,000,000
China Bills Finance Corporation [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | 2,500,000 | 90,123 | $ 2,000,000
International Bills Finance Corporation [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Long-term bills payable | $ 1,500,000 | $ 54,073 |

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