v3.26.1
Investment Properties - Summary of Investment Properties (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
TWD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Disclosure of detailed information about investment property [line items]        
Beginning balance $ 20,055,044   $ 20,169,116  
Depreciation expenses 1,043,625 $ 33,268 1,079,259 $ 1,091,879
Ending balance 18,736,891 597,287 20,055,044 20,169,116
Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,572   35,572  
Ending balance 35,572 1,134 35,572 35,572
Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 11,600,957   11,808,566  
Ending balance 10,771,388 343,366 11,600,957 11,808,566
Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 8,418,515   8,324,978  
Ending balance 7,929,931 252,787 8,418,515 8,324,978
Cost [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 27,632,640 880,862 26,340,018 26,968,895
Additions 33,260 1,060 15,145 35,304
Disposals     (62)  
Reclassification 333,211 10,622 (88,017) (194,821)
Effects of foreign currency exchange differences (523,434) (16,686) 1,365,556 (469,360)
Ending balance 27,475,677 875,858 27,632,640 26,340,018
Cost [member] | Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,572 1,134 35,572 35,572
Ending balance 35,572 1,134 35,572 35,572
Cost [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 17,084,323 544,607 16,311,886 16,757,443
Additions 33,260 1,060 15,145 35,304
Disposals     (62)  
Reclassification 315,032 10,042 (88,176) (182,588)
Effects of foreign currency exchange differences (318,251) (10,145) 845,530 (298,273)
Ending balance 17,114,364 545,564 17,084,323 16,311,886
Cost [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 10,512,745 335,121 9,992,560 10,175,880
Reclassification 18,179 580 159 (12,233)
Effects of foreign currency exchange differences (205,183) (6,541) 520,026 (171,087)
Ending balance 10,325,741 329,160 10,512,745 9,992,560
Accumulated depreciations [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 7,577,596 241,555 6,170,902 5,239,803
Depreciation expenses 1,043,625 33,268 1,079,259 1,091,879
Disposals     (28)  
Reclassification 225,758 7,197 (9,286) (55,340)
Effects of foreign currency exchange differences (108,193) (3,449) 336,749 (105,440)
Ending balance 8,738,786 278,571 7,577,596 6,170,902
Accumulated depreciations [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 5,483,366 174,796 4,503,320 3,868,107
Depreciation expenses 723,339 23,058 748,055 766,322
Disposals     (28)  
Reclassification 216,195 6,892 (9,340) (51,031)
Effects of foreign currency exchange differences (79,924) (2,548) 241,359 (80,078)
Ending balance 6,342,976 202,198 5,483,366 4,503,320
Accumulated depreciations [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 2,094,230 66,759 1,667,582 1,371,696
Depreciation expenses 320,286 10,210 331,204 325,557
Reclassification 9,563 305 54 (4,309)
Effects of foreign currency exchange differences (28,269) (901) 95,390 (25,362)
Ending balance $ 2,395,810 $ 76,373 $ 2,094,230 $ 1,667,582