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Profit Before Income Tax - Summary of Finance Costs (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Interest on lease liabilities | $ 105,159 | $ 3,791 | $ 88,026 | $ 88,742
Interest on borrowings and bonds payable | 2,790,368 | 100,590 | 3,498,999 | 4,211,541
Total interest expense for financial liabilities measured at amortized cost | 2,895,527 | 104,381 | 3,587,025 | 4,300,283
Less: Amounts included in the cost of qualifying assets |  |  |  |
Inventories related to real estate business | (71,011) | (2,560) | (95,589) | (35,713)
Property, plant and equipment | (25,581) | (922) | (54,208) | (77,715)
Interest expense | 2,798,935 | 100,899 | 3,437,228 | 4,186,855
Other finance costs | 32,372 | 1,167 | 22,283 | 16,540
Finance costs | $ 2,831,307 | $ 102,066 | $ 3,459,511 | $ 4,203,395

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