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Investment Properties - Summary of Investment Properties (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of detailed information about investment property [line items]        
Beginning balance $ 12,538,083   $ 12,854,071  
Depreciation expenses 751,047 $ 27,074 562,260 $ 594,110
Ending balance 22,144,787 798,298 12,538,083 12,854,071
Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,965   35,965  
Ending balance 35,572 1,282 35,965 35,965
Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 6,480,338   6,737,798  
Ending balance 13,103,952 472,385 6,480,338 6,737,798
Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 6,021,780   6,080,308  
Ending balance 9,005,263 324,631 6,021,780 6,080,308
Cost [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 14,597,683 526,232 14,314,126 15,337,702
Additions     6,352 2,532
Disposals (5,350) (193) (1,902) (1,843)
Disposal of subsidiaries (1,377,599) (49,661)    
Reclassification 13,215,879 476,420 42,317 (511,199)
Effects of foreign currency exchange differences 23,735 856 236,790 (513,066)
Ending balance 26,454,348 953,654 14,597,683 14,314,126
Cost [member] | Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,965 1,296 35,965 35,965
Reclassification (393) (14)    
Effects of foreign currency exchange differences 0      
Ending balance 35,572 1,282 35,965 35,965
Cost [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 7,822,805 282,005 7,710,369 8,409,790
Additions     6,352 2,532
Disposals (5,350) (193) (1,902) (1,843)
Disposal of subsidiaries (1,290,187) (46,510)    
Reclassification 9,818,133 353,934 (3,884) (490,130)
Effects of foreign currency exchange differences 30,697 1,107 111,870 (209,980)
Ending balance 16,376,098 590,343 7,822,805 7,710,369
Cost [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 6,738,913 242,931 6,567,792 6,891,947
Disposal of subsidiaries (87,412) (3,151)    
Reclassification 3,398,139 122,500 46,201 (21,069)
Effects of foreign currency exchange differences (6,962) (251) 124,920 (303,086)
Ending balance 10,042,678 362,029 6,738,913 6,567,792
Accumulated depreciations [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 2,059,600 74,247 1,460,055 1,000,098
Depreciation expenses 751,047 27,074 562,260 594,110
Disposals (3,671) (132) (1,293) (1,240)
Disposal of subsidiaries (590,349) (21,282)    
Reclassification 2,093,115 75,455 9,119 (209,912)
Effects of foreign currency exchange differences (181) (6) 29,459 76,999
Ending balance 4,309,561 155,356 2,059,600 1,460,055
Accumulated depreciations [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 1,342,467 48,395 972,571 707,376
Depreciation expenses 482,625 17,398 353,048 377,536
Disposals (3,671) (132) (1,293) (1,240)
Disposal of subsidiaries (570,403) (20,563)    
Reclassification 2,014,201 72,610 (1,498) (210,455)
Effects of foreign currency exchange differences 6,927 250 19,639 99,354
Ending balance 3,272,146 117,958 1,342,467 972,571
Accumulated depreciations [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 717,133 25,852 487,484 292,722
Depreciation expenses 268,422 9,676 209,212 216,574
Disposal of subsidiaries (19,946) (719)    
Reclassification 78,914 2,845 10,617 543
Effects of foreign currency exchange differences (7,108) (256) 9,820 (22,355)
Ending balance $ 1,037,415 $ 37,398 $ 717,133 $ 487,484