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Investment Properties - Summary of Investment Properties (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of detailed information about investment property [line items]        
Beginning balance $ 20,169,116   $ 21,729,092  
Depreciation expenses 1,079,259 $ 32,914 1,091,879 $ 1,107,014
Ending balance 20,055,044 611,621 20,169,116 21,729,092
Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,572   35,572  
Ending balance 35,572 1,085 35,572 35,572
Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 11,808,566   12,889,336  
Ending balance 11,600,957 353,796 11,808,566 12,889,336
Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 8,324,978   8,804,184  
Ending balance 8,418,515 256,740 8,324,978 8,804,184
Cost [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 26,340,018 803,295 26,968,895 26,454,348
Additions 15,145 462 35,304 114,786
Disposals (62) (2)   (9,770)
Reclassification (88,017) (2,684) (194,821) 28,844
Effects of foreign currency exchange differences 1,365,556 41,645 (469,360) 380,687
Ending balance 27,632,640 842,716 26,340,018 26,968,895
Cost [member] | Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,572 1,085 35,572 35,572
Ending balance 35,572 1,085 35,572 35,572
Cost [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 16,311,886 497,466 16,757,443 16,376,098
Additions 15,145 462 35,304 114,786
Disposals (62) (2)   (9,770)
Reclassification (88,176) (2,689) (182,588) 39,158
Effects of foreign currency exchange differences 845,530 25,786 (298,273) 237,171
Ending balance 17,084,323 521,023 16,311,886 16,757,443
Cost [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 9,992,560 304,744 10,175,880 10,042,678
Reclassification 159 5 (12,233) (10,314)
Effects of foreign currency exchange differences 520,026 15,859 (171,087) 143,516
Ending balance 10,512,745 320,608 9,992,560 10,175,880
Accumulated depreciations [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 6,170,902 188,194 5,239,803 4,309,561
Depreciation expenses 1,079,259 32,914 1,091,879 1,107,014
Disposals (28) (1)   (8,354)
Reclassification (9,286) (282) (55,340) (210,817)
Effects of foreign currency exchange differences 336,749 10,270 (105,440) 42,399
Ending balance 7,577,596 231,095 6,170,902 5,239,803
Accumulated depreciations [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 4,503,320 137,338 3,868,107 3,272,146
Depreciation expenses 748,055 22,813 766,322 779,431
Disposals (28) (1)   (8,354)
Reclassification (9,340) (284) (51,031) (198,631)
Effects of foreign currency exchange differences 241,359 7,361 (80,078) 23,515
Ending balance 5,483,366 167,227 4,503,320 3,868,107
Accumulated depreciations [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 1,667,582 50,856 1,371,696 1,037,415
Depreciation expenses 331,204 10,101 325,557 327,583
Reclassification 54 2 (4,309) (12,186)
Effects of foreign currency exchange differences 95,390 2,909 (25,362) 18,884
Ending balance $ 2,094,230 $ 63,868 $ 1,667,582 $ 1,371,696