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Supplementary Cash Flow Information - Reconciliation of Liabilities Arising from Financing Activities (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance $ 9,790,610 $ 10,612,745 $ 10,751,409
Effects on initial application of IFRS 16 884,275    
Adjusted balance at January 1, 2019 10,674,885    
Changes in cash flow from financing activities (804,608) (859,382) (155,379)
Adjustment to right-of-use assets (148,512)    
Reclassification to payable on equipment from lease liabilities (9,000)    
Amortization Loan Fees 8,577 37,247 16,715
Amortization Of Interest Expense 14,349    
Ending balance 9,735,691 9,790,610 10,612,745
Long-term bank loans (include the current portion) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 9,789,518 9,642,021 10,750,005
Adjusted balance at January 1, 2019 9,789,518    
Changes in cash flow from financing activities (756,450) 110,250 (1,124,699)
Amortization Loan Fees 8,577 37,247 16,715
Ending balance 9,041,645 9,789,518 9,642,021
Short-term bank loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance   969,353  
Changes in cash flow from financing activities   (969,353) 969,353
Ending balance     969,353
Guarantee deposits [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 1,092 1,371 1,404
Adjusted balance at January 1, 2019 1,092    
Changes in cash flow from financing activities 3 (279) (33)
Ending balance 1,095 $ 1,092 $ 1,371
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Effects on initial application of IFRS 16 884,275    
Adjusted balance at January 1, 2019 884,275    
Changes in cash flow from financing activities (48,161)    
Adjustment to right-of-use assets (148,512)    
Reclassification to payable on equipment from lease liabilities (9,000)    
Amortization Of Interest Expense 14,349    
Ending balance $ 692,951