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Borrowings - Summary of Bank Loans (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of detailed information about borrowings [line items]      
Less: current portion $ 352,141 $ 10,779,034 $ 8,261,625
Noncurrent portion 4,152,868 127,119,295 27,145,003
Bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 4,403,760 134,799,097 33,407,496
Less: current portion 352,141 10,779,034 8,261,625
Noncurrent portion 4,051,619 124,020,063 25,145,871
Bank loans [member] | Cost [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 4,407,944 134,927,180 33,408,696
Bank loans [member] | Cost [member] | Syndicated bank loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 1,796,798 55,000,000 4,761,600
Bank loans [member] | Cost [member] | Other loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 2,467,604 75,533,354 23,941,947
Bank loans [member] | Cost [member] | Mortgage loans [Member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings 143,542 4,393,826 4,705,149
Bank loans [member] | Net Unamortized Debt Issue Costs [member]      
Disclosure of detailed information about borrowings [line items]      
Long-term borrowings $ 4,184 $ 128,083 $ 1,200