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Capital Management - Percentages of Liabilities to Assets Ratio Used for Monitoring Capital (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($)
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Disclosure of objectives, policies and processes for managing capital [abstract] |  |  |
Total liabilities | $ 14,364,975 | $ 511,573 | $ 14,775,302
Total assets | $ 35,080,814 | $ 1,249,317 | $ 34,305,887
Liabilities to assets ratio | 40.95% | 40.95% | 43.07%

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