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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 ($)
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%