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Trade Receivables, Net - Summary of Aging of Receivables Past Due but Not Impaired (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables $ 55,200,706 $ 1,862,372 $ 51,145,557
Past due but not impaired [member]      
Disclosure of financial assets that are either past due or impaired [line items]      
Trade receivables 5,321,203 179,528 5,046,126
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 4,942,677 166,757 4,449,479
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 $ 12,771 $ 596,647