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Inventories - Additional Information (Detail)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Classes of current inventories [abstract]        
Cost of inventories recognized as operating costs $ 458,345,579 $ 16,522,912 $ 398,068,260 $ 347,877,603
Write-downs of inventories $ 647,946 $ 23,358 $ 1,493,793 $ 452,134