XML 111 R114.htm IDEA: XBRL DOCUMENT v3.20.1
Lease Arrangements - Summary of Right-of-Use Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2019
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts $ 9,792,221       $ 327,390
Additions to right-of-use assets 824,268 $ 27,558      
Depreciation charge for right-of-use assets 1,055,458 35,288 $ 0 $ 0  
Land [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 7,036,887       235,269
Depreciation charge for right-of-use assets 215,301 7,198      
Buildings and improvements [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 2,121,797       70,939
Depreciation charge for right-of-use assets 307,708 10,288      
Machinery and equipment [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 588,443       19,674
Depreciation charge for right-of-use assets 507,443 16,966      
Other equipment [member]          
Disclosure of quantitative information about right-of-use assets [line items]          
Carrying amounts 45,094       $ 1,508
Depreciation charge for right-of-use assets $ 25,006 $ 836