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Investment Properties - Summary of Investment Properties (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of detailed information about investment property [line items]        
Beginning balance $ 22,144,787   $ 12,538,083  
Depreciation expenses 1,107,014 $ 36,024 751,047 $ 562,260
Ending balance 21,729,092 707,097 22,144,787 12,538,083
Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,572   35,965  
Ending balance 35,572 1,158 35,572 35,965
Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 13,103,952   6,480,338  
Ending balance 12,889,336 419,438 13,103,952 6,480,338
Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 9,005,263   6,021,780  
Ending balance 8,804,184 286,501 9,005,263 6,021,780
Cost [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 26,454,348 860,865 14,597,683 14,314,126
Additions 114,786 3,735   6,352
Disposals (9,770) (318) (5,350) (1,902)
Disposal of subsidiaries     (1,377,599)  
Reclassification 28,844 938 13,215,879 42,317
Effects of foreign currency exchange differences 380,687 12,388 23,735 236,790
Ending balance 26,968,895 877,608 26,454,348 14,597,683
Cost [member] | Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,572 1,158 35,965 35,965
Reclassification 0 0 (393)  
Effects of foreign currency exchange differences 0      
Ending balance 35,572 1,158 35,572 35,965
Cost [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 16,376,098 532,903 7,822,805 7,710,369
Additions 114,786 3,735   6,352
Disposals (9,770) (318) (5,350) (1,902)
Disposal of subsidiaries     (1,290,187)  
Reclassification 39,158 1,274 9,818,133 (3,884)
Effects of foreign currency exchange differences 237,171 7,718 30,697 111,870
Ending balance 16,757,443 545,312 16,376,098 7,822,805
Cost [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 10,042,678 326,804 6,738,913 6,567,792
Disposal of subsidiaries     (87,412)  
Reclassification (10,314) (336) 3,398,139 46,201
Effects of foreign currency exchange differences 143,516 4,670 (6,962) 124,920
Ending balance 10,175,880 331,138 10,042,678 6,738,913
Accumulated depreciations [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 4,309,561 140,240 2,059,600 1,460,055
Depreciation expenses 1,107,014 36,024 751,047 562,260
Disposals (8,354) (272) (3,671) (1,293)
Disposal of subsidiaries     (590,349)  
Reclassification (210,817) (6,861) 2,093,115 9,119
Effects of foreign currency exchange differences 42,399 1,380 (181) 29,459
Ending balance 5,239,803 170,511 4,309,561 2,059,600
Accumulated depreciations [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 3,272,146 106,481 1,342,467 972,571
Depreciation expenses 779,431 25,364 482,625 353,048
Disposals (8,354) (272) (3,671) (1,293)
Disposal of subsidiaries     (570,403)  
Reclassification (198,631) (6,464) 2,014,201 (1,498)
Effects of foreign currency exchange differences 23,515 765 6,927 19,639
Ending balance 3,868,107 125,874 3,272,146 1,342,467
Accumulated depreciations [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 1,037,415 33,759 717,133 487,484
Depreciation expenses 327,583 10,660 268,422 209,212
Disposal of subsidiaries     (19,946)  
Reclassification (12,186) (397) 78,914 10,617
Effects of foreign currency exchange differences 18,884 615 (7,108) 9,820
Ending balance $ 1,371,696 $ 44,637 $ 1,037,415 $ 717,133