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Trade Receivables, Net - Summary of Aging of Receivables Based on Past Due Date (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of financial assets [Line Items]      
Trade receivables $ 55,200,706 $ 1,862,372 $ 51,145,557
Cost [member]      
Disclosure of financial assets [Line Items]      
Trade receivables 55,265,607 1,864,562 51,199,266
Cost [member] | Not past due [member]      
Disclosure of financial assets [Line Items]      
Trade receivables 49,599,512 1,673,398 45,959,876
Cost [member] | Less than 1 month [member]      
Disclosure of financial assets [Line Items]      
Trade receivables 4,986,491 168,235 4,467,435
Cost [member] | 1 to 3 months [member]      
Disclosure of financial assets [Line Items]      
Trade receivables 562,200 18,968 700,122
Cost [member] | More than 91 days [member]      
Disclosure of financial assets [Line Items]      
Trade receivables $ 117,404 $ 3,961 $ 71,833