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Capital Management - Percentages of Liabilities to Assets Ratio Used for Monitoring Capital (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($)
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Disclosure of objectives, policies and processes for managing capital [abstract] |  |  |
Total liabilities | $ 18,380,369 | $ 662,595 | $ 14,364,975
Total assets | $ 42,522,584 | $ 1,532,898 | $ 35,080,814
Liabilities to assets ratio | 43.22% | 43.22% | 40.95%

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