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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Cash and cash equivalents [abstract]            
Cash on hand $ 6,567 $ 220 $ 7,940      
Checking accounts and demand deposits 44,565,936 1,490,001 32,329,820      
Cash equivalents 15,558,372 520,173 19,180,676      
Cash and cash equivalents,total $ 60,130,875 $ 2,010,394 $ 51,518,436 $ 1,722,449 $ 46,078,066 $ 38,392,524