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Changes in liabilities from financing activities - Reconciliation of Liabilities Arising from Financing Activities (Detail) - TWD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance $ 9,735,691 $ 9,790,610 $ 10,612,745
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 (1,411,210) (804,608) (859,382)
Adjustment to right-of-use assets 249,030 (148,512)  
Reclassification to payable on equipment from lease liabilities   (9,000)  
Reclassification 20,000    
Amortization of loan fees 7,581 8,577 37,247
Amortization Of Interest Expense 24,638 14,349  
Ending balance 8,625,730 9,735,691 9,790,610
Long-term bank loans (include the current portion) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 9,041,645 9,789,518 9,642,021
Adjusted balance at January 1, 2019   9,789,518  
Changes in cash flow from financing activities (1,326,857) (756,450) 110,250
Amortization of loan fees 7,581 8,577 37,247
Amortization Of Interest Expense 11,196    
Ending balance 7,733,565 9,041,645 9,789,518
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)
Guarantee deposits [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 1,095 1,092 1,371
Adjusted balance at January 1, 2019   1,092  
Changes in cash flow from financing activities 575 3 (279)
Reclassification 20,000    
Ending balance 21,670 1,095 $ 1,092
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 692,951    
Effects on initial application of IFRS 16   884,275  
Adjusted balance at January 1, 2019   884,275  
Changes in cash flow from financing activities (84,928) (48,161)  
Adjustment to right-of-use assets 249,030 (148,512)  
Reclassification to payable on equipment from lease liabilities   (9,000)  
Amortization Of Interest Expense 13,442 14,349  
Ending balance $ 870,495 $ 692,951