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Contents of Significant Accounts - Earnings Per Share (Detail)
$ / shares in Units, $ / shares in Units, shares in Thousands, $ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
TWD ($)
$ / shares
shares
Dec. 31, 2022
TWD ($)
$ / shares
shares
Earnings per share-basic        
Net income attributable to the parent company $ 48,779,300 $ 1,487,627 $ 59,688,950 $ 89,478,805
Weighted-average number of ordinary shares for basic earnings per share (thousand shares) 12,173,188 12,173,188 12,137,954 12,095,312
Earnings per share-basic (NTD) | (per share) $ 4.01 $ 0.12 $ 4.92 $ 7.4
Earnings per share-diluted        
Net income attributable to the parent company $ 48,779,300 $ 1,487,627 $ 59,688,950 $ 89,478,805
Weighted-average number of ordinary shares for basic earnings per share (thousand shares) 12,173,188 12,173,188 12,137,954 12,095,312
Effect of dilution        
Restricted stocks for employees 69,881 69,881 114,974 156,098
Employees' compensation 122,400 122,400 129,196 238,242
Weighted-average number of ordinary shares after dilution (thousand shares) 12,365,469 12,365,469 12,382,124 12,489,652
Earnings per share-diluted (NTD) | (per share) $ 3.94 $ 0.12 $ 4.82 $ 7.16