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Trade Receivables, Net - Summary of Aging of Receivables Based on Past Due Date (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of financial assets [Line Items]      
Trade receivables $ 2,596,581 $ 79,481,359 $ 55,200,706
Cost [member]      
Disclosure of financial assets [Line Items]      
Trade receivables $ 2,601,658 $ 79,636,748 55,265,607
Cost [member] | Not past due [member]      
Disclosure of financial assets [Line Items]      
Trade receivables     49,599,512
Cost [member] | Less than 1 month [member]      
Disclosure of financial assets [Line Items]      
Trade receivables     4,986,491
Cost [member] | 1 to 3 months [member]      
Disclosure of financial assets [Line Items]      
Trade receivables     562,200
Cost [member] | More than 91 days [member]      
Disclosure of financial assets [Line Items]      
Trade receivables     $ 117,404