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Investment Properties - Summary of Investment Properties (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about investment property [line items]        
Beginning balance $ 7,738,379   $ 8,119,436  
Depreciation expenses 594,110 $ 19,863 392,667 $ 122,231
Ending balance 12,854,071 429,758 7,738,379 8,119,436
Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,965   35,965  
Ending balance 35,965 1,202 35,965 35,965
Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 7,702,414   8,083,471  
Ending balance 6,737,798 225,269 7,702,414 8,083,471
Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Ending balance 6,080,308 203,287    
Cost [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 15,337,702 512,795 8,442,750  
Additions 2,532 85 125,853 186,535
Disposals (1,843) (62)   (342)
Reclassification (511,199) (17,091) 14,891 8,150,075
Effects of foreign currency exchange differences (513,066) (17,153) (137,739) 106,482
Ending balance 14,314,126 478,574 15,337,702 8,442,750
Cost [member] | Previously stated [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 8,445,755 282,372    
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 6,891,947 230,423    
Ending balance     6,891,947  
Cost [member] | Land [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,965 1,202 35,965  
Reclassification       35,965
Ending balance 35,965 1,202 35,965 35,965
Cost [member] | Land [member] | Previously stated [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 35,965 1,202    
Ending balance     35,965  
Cost [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 8,409,790 281,170 8,406,785  
Additions 2,532 85 125,853 186,535
Disposals (1,843) (62)   (342)
Reclassification (490,130) (16,387) 14,891 8,114,110
Effects of foreign currency exchange differences (209,980) (7,020) (137,739) 106,482
Ending balance 7,710,369 257,786 8,409,790 8,406,785
Cost [member] | Buildings and improvements [member] | Previously stated [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 8,409,790 281,170    
Ending balance     8,409,790  
Cost [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 6,891,947 230,423    
Reclassification (21,069) (704)    
Effects of foreign currency exchange differences (303,086) (10,133)    
Ending balance 6,567,792 219,586 6,891,947  
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 6,891,947 230,423    
Ending balance     6,891,947  
Accumulated depreciation, amortisation and impairment [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 1,000,098 33,437 323,314  
Depreciation expenses 594,110 19,863 392,667 122,231
Disposals (1,240) (41)   (161)
Reclassification (209,912) (7,018) 265 199,745
Effects of foreign currency exchange differences 76,999 2,575 (8,870) 1,499
Ending balance 1,460,055 48,816 1,000,098 323,314
Accumulated depreciation, amortisation and impairment [member] | Previously stated [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 707,376 23,650    
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 292,722 9,787    
Ending balance     292,722  
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 707,376 23,650 323,314  
Depreciation expenses 377,536 12,622 392,667 122,231
Disposals (1,240) (41)   (161)
Reclassification (210,455) (7,036) 265 199,745
Effects of foreign currency exchange differences 99,354 3,322 (8,870) 1,499
Ending balance 972,571 32,517 707,376 $ 323,314
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 23,650    
Ending balance     707,376  
Accumulated depreciation, amortisation and impairment [member] | Right-of-use assets [member]        
Disclosure of detailed information about investment property [line items]        
Beginning balance 292,722 9,787    
Depreciation expenses 216,574 7,241    
Reclassification 543 18    
Effects of foreign currency exchange differences (22,355) (747)    
Ending balance 487,484 16,299 292,722  
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 $ 9,787    
Ending balance     $ 292,722