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Investment Properties - Summary of Investment Properties (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about investment property [line items]      
Beginning balance   $ 8,119,436  
Depreciation expenses $ 12,828 392,667 $ 122,231
Ending balance 252,806 7,738,379 8,119,436
Land [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   35,965  
Ending balance 1,175 35,965 35,965
Buildings and improvements [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance   8,083,471  
Ending balance 251,631 7,702,414 8,083,471
Cost [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 275,817 8,442,750  
Additions 4,111 125,853 186,535
Disposals     (342)
Transferred from inventories related to real estate business and property, plant and equipment 487 14,891 8,150,075
Effects of foreign currency exchange differences (4,500) (137,739) 106,482
Ending balance 275,915 8,445,755 8,442,750
Cost [member] | Land [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 1,175 35,965  
Transferred from inventories related to real estate business and property, plant and equipment     35,965
Ending balance 1,175 35,965 35,965
Cost [member] | Buildings and improvements [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 274,642 8,406,785  
Additions 4,111 125,853 186,535
Disposals     (342)
Transferred from inventories related to real estate business and property, plant and equipment 487 14,891 8,114,110
Effects of foreign currency exchange differences (4,500) (137,739) 106,482
Ending balance 274,740 8,409,790 8,406,785
Accumulated depreciation, amortisation and impairment [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 10,562 323,314  
Depreciation expenses 12,828 392,667 122,231
Disposals     (161)
Transferred from inventories related to real estate business and property, plant and equipment 9 265 199,745
Effects of foreign currency exchange differences (290) (8,870) 1,499
Ending balance 23,109 707,376 323,314
Accumulated depreciation, amortisation and impairment [member] | Buildings and improvements [member]      
Disclosure of detailed information about investment property [line items]      
Beginning balance 10,562 323,314  
Depreciation expenses 12,828 392,667 122,231
Disposals     (161)
Transferred from inventories related to real estate business and property, plant and equipment 9 265 199,745
Effects of foreign currency exchange differences (290) (8,870) 1,499
Ending balance $ 23,109 $ 707,376 $ 323,314