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Contents of Significant Accounts - Summary of Information about Provisions of Liabilities (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Onerous Contracts [member]  
Disclosure of other provisions [line items]  
Balance as of January 1, 2023 $ 469,779
Arising during the period 40,154
Unused provision reversed (450,968)
Discount rate adjustment and unwinding of discount from the passage of time 0
Exchange effect (1,165)
Balance as of December 31, 2023 57,800
Decommissioning Liabilities [member]  
Disclosure of other provisions [line items]  
Balance as of January 1, 2023 366,863
Arising during the period 191,360
Unused provision reversed 0
Discount rate adjustment and unwinding of discount from the passage of time 47,880
Exchange effect (3,670)
Balance as of December 31, 2023 $ 602,433