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Trade Receivables, Net - Summary of Aging of Receivables Past Due but Not Impaired (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables $ 2,596,581 $ 79,481,359 $ 55,200,706
Past due but not impaired [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables     5,321,203
Past due but not impaired [member] | 1 to 30 days [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables     4,942,677
Past due but not impaired [member] | 1 to 3 months [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables     $ 378,526