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Investment Properties - Summary of Investment Properties (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Disclosure of detailed information about investment property [line items]          
Beginning balance $ 12,854,071   $ 7,738,379    
Depreciation expenses 562,260 $ 20,023 594,110   $ 392,667
Ending balance 12,538,083 446,513 12,854,071   7,738,379
Land [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 35,965   35,965    
Ending balance 35,965 1,281 35,965   35,965
Buildings and improvements [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 6,737,798   7,702,414    
Ending balance 6,480,338 230,781 6,737,798   7,702,414
Right-of-use assets [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 6,080,308        
Ending balance 6,021,780 214,451 6,080,308    
Cost [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 14,314,126 509,763 14,314,126   8,442,750
Additions 6,352 226 2,532   125,853
Disposals (1,902) (68) (1,843)    
Reclassification 42,317 1,507 (511,199)   14,891
Effects of foreign currency exchange differences 236,790 8,433 (513,066)   (137,739)
Ending balance 14,597,683 519,861 14,314,126 $ 509,763 14,314,126
Cost [member] | Previously stated [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance     8,445,755    
Ending balance         8,445,755
Cost [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance       15,337,702  
Ending balance          
Cost [member] | Land [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 35,965 1,281     35,965
Ending balance 35,965 1,281 35,965 1,281  
Cost [member] | Land [member] | Previously stated [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance     35,965    
Ending balance         35,965
Cost [member] | Land [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance       35,965  
Ending balance          
Cost [member] | Buildings and improvements [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 7,710,369 274,586 7,710,369   8,406,785
Additions 6,352 226 2,532   125,853
Disposals (1,902) (68) (1,843)    
Reclassification (3,884) (138) (490,130)   14,891
Effects of foreign currency exchange differences 111,870 3,984 (209,980)   (137,739)
Ending balance 7,822,805 278,590 7,710,369 274,586 7,710,369
Cost [member] | Buildings and improvements [member] | Previously stated [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance     8,409,790    
Ending balance         8,409,790
Cost [member] | Buildings and improvements [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance       8,409,790  
Ending balance          
Cost [member] | Right-of-use assets [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 6,567,792 233,896 6,567,792    
Reclassification 46,201 1,645 (21,069)    
Effects of foreign currency exchange differences 124,920 4,449 (303,086)    
Ending balance 6,738,913 239,990 6,567,792 233,896 6,567,792
Cost [member] | Right-of-use assets [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance       6,891,947  
Ending balance          
Accumulated depreciation, amortisation and impairment [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 1,460,055 51,996 1,460,055   323,314
Depreciation expenses 562,260 20,023 594,110   392,667
Disposals (1,293) (46) (1,240)    
Reclassification 9,119 325 (209,912)   265
Effects of foreign currency exchange differences 29,459 1,050 76,999   (8,870)
Ending balance 2,059,600 73,348 1,460,055 51,996 1,460,055
Accumulated depreciation, amortisation and impairment [member] | Previously stated [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance     707,376    
Ending balance         707,376
Accumulated depreciation, amortisation and impairment [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance       1,000,098  
Ending balance          
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 972,571 34,636 972,571   323,314
Depreciation expenses 353,048 12,573 377,536   392,667
Disposals (1,293) (46) (1,240)    
Reclassification (1,498) (53) (210,455)   265
Effects of foreign currency exchange differences 19,639 699 99,354   (8,870)
Ending balance 1,342,467 47,809 972,571 34,636 972,571
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member] | Previously stated [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance     707,376    
Ending balance         707,376
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance       707,376  
Ending balance          
Accumulated depreciation, amortisation and impairment [member] | Right-of-use assets [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance 487,484 17,360 487,484    
Depreciation expenses 209,212 7,450 216,574    
Reclassification 10,617 378 543    
Effects of foreign currency exchange differences 9,820 351 (22,355)    
Ending balance $ 717,133 $ 25,539 $ 487,484 17,360 $ 487,484
Accumulated depreciation, amortisation and impairment [member] | Right-of-use assets [member] | Increase (decrease) due to changes in accounting policy required by IFRSs [member]          
Disclosure of detailed information about investment property [line items]          
Beginning balance       $ 292,722  
Ending balance