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Bonds Payable - Summary of Bonds 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] |  |  |
Bonds payable | $ 52,267,337 | $ 1,884,187 | $ 56,253,554
Noncurrent portion | 42,364,627 | 1,527,204 | 49,253,603
Less: current portion of bonds payable | 9,902,710 | 356,983 | 6,999,951
Cost [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 52,692,581 | 1,899,517 | 56,307,200
Cost [member] | Repayable at maturity in January 2021 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 0 | 0 | 7,000,000
Cost [member] | Repayable at maturity in January 2023 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 2,000,000 | 72,098 | 2,000,000
Cost [member] | Repayable at maturity in January 2022 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 3,700,000 | 133,381 | 3,700,000
Cost [member] | Repayable at maturity in January 2024 [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 4,300,000 | 155,011 | 4,300,000
Cost [member] | Repayable at maturity in April 2024 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 6,500,000 | 234,319 | 6,500,000
Cost [member] | Repayable at maturity in April 2026 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 3,500,000 | 126,172 | 3,500,000
Cost [member] | Repayable at maturity in April 2025 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 10,000,000 | 360,490 | 10,000,000
Cost [member] | Repayable at maturity in October 2022 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 6,204,800 | 223,677 | 6,204,800
Cost [member] | Repayable at maturity in October 2024 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 3,102,400 | 111,839 | 3,102,400
Cost [member] | Repayable at maturity in August 2023 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 3,000,000 | 108,147 | 3,000,000
Cost [member] | Repayable at maturity in August 2025 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 5,000,000 | 180,245 | 5,000,000
Cost [member] | Repayable at maturity in August 2027 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 2,000,000 | 72,098 | 2,000,000
Cost [member] | Repayable at Maturity in March 2027 [Member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | 3,385,381 | 122,040 |
Discounts on bonds payable [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Bonds payable | $ 425,244 | $ 15,330 | $ 53,646

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