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Contents of Significant Accounts - Defined Benefit Plan Recognized on the Consolidated Balance Sheets (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Disclosure Of Defined Benefit Plans [Abstract]      
Present value of the defined benefit obligation $ (4,665,498)   $ (5,106,623)
Fair value of plan assets 2,460,413   2,237,221
Funded status (2,205,085)   (2,869,402)
Net defined benefit liabilities, noncurrent recognized on the consolidated balance sheets $ (2,205,085) $ (72,014) $ (2,869,402)