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Contents of Significant Accounts - Leases (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2023
USD ($)
Disclosure Of Lease By Lessee [Line Items]      
Depreciation $ 691,080 $ 701,948  
Right-of-use assets 7,000,355 7,611,991 $ 228,620
Current 514,324 537,314 16,797
Noncurrent 4,878,863 5,199,781 $ 159,336
Total 5,393,187 5,737,095  
Land [member]      
Disclosure Of Lease By Lessee [Line Items]      
Depreciation 377,593 359,007  
Right-of-use assets 5,318,986 5,714,166  
Buildings [member]      
Disclosure Of Lease By Lessee [Line Items]      
Depreciation 93,610 119,641  
Right-of-use assets 156,483 124,420  
Machinery and equipment [member]      
Disclosure Of Lease By Lessee [Line Items]      
Depreciation 203,606 206,445  
Right-of-use assets 1,506,824 1,748,244  
Transportation equipment [member]      
Disclosure Of Lease By Lessee [Line Items]      
Depreciation 13,267 12,287  
Right-of-use assets 16,356 21,485  
Other property, plant and equipment [member]      
Disclosure Of Lease By Lessee [Line Items]      
Depreciation 3,004 4,568  
Right-of-use assets $ 1,706 $ 3,676