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Borrowings - Summary of Bank Loans (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Less: current portion $ 8,261,625 $ 278,732 $ 6,567,565
Noncurrent portion 27,145,003 915,823 46,547,998
Bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 31,907,496 1,076,501 49,616,222
Less: current portion 6,761,625 228,125 6,567,565
Noncurrent portion 25,145,871 848,376 43,048,657
Bank loans [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 31,908,696 1,076,541 49,623,420
Bank loans [member] | Cost [member] | Syndicated bank loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 4,761,600 160,647 9,223,500
Bank loans [member] | Cost [member] | Other loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 22,441,947 757,151 36,009,917
Bank loans [member] | Cost [member] | Mortgage loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 4,705,149 158,743 4,390,003
Bank loans [member] | Net Unamortized Debt Issue Costs [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings $ 1,200 $ 40 $ 7,198