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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
TWD ($)
Dec. 31, 2014
TWD ($)
Cash and cash equivalents [abstract]            
Cash on hand $ 8,404 $ 284 $ 6,856      
Checking accounts and demand deposits 39,697,319 1,339,316 28,823,763      
Cash equivalents 6,372,343 214,991 9,561,905      
Cash and cash equivalents,total $ 46,078,066 $ 1,554,591 $ 38,392,524 $ 1,295,294 $ 55,251,181 $ 51,694,410