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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance $ 8,625,730 $ 9,735,691 $ 9,790,610
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 2,094,370 (1,411,210) (804,608)
Adjustment to right-of-use assets 255,179 249,030 (148,512)
Reclassification to payable on equipment from lease liabilities     (9,000)
Reclassification   20,000  
Amortization Of Interest Expense 35,067 24,638 14,349
Amortization of loan fees 7,646 7,581 8,577
Ending balance 11,017,992 8,625,730 9,735,691
Long-term bank loans (include the current portion) [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 7,733,565 9,041,645 9,789,518
Adjusted balance at January 1, 2019     9,789,518
Changes in cash flow from financing activities 1,652,332 (1,326,857) (756,450)
Amortization Of Interest Expense 19,822 11,196  
Amortization of loan fees 7,646 7,581 8,577
Ending balance 9,413,365 7,733,565 9,041,645
Short-term bank loans [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Changes in cash flow from financing activities 731,751    
Ending balance 731,751    
Guarantee deposits [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 21,670 1,095 1,092
Adjusted balance at January 1, 2019     1,092
Changes in cash flow from financing activities (45) 575 3
Reclassification   20,000  
Ending balance 21,625 21,670 1,095
Lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 870,495 692,951  
Effects on initial application of IFRS 16     884,275
Adjusted balance at January 1, 2019     884,275
Changes in cash flow from financing activities (289,668) (84,928) (48,161)
Adjustment to right-of-use assets 255,179 249,030 (148,512)
Reclassification to payable on equipment from lease liabilities     (9,000)
Amortization Of Interest Expense 15,245 13,442 14,349
Ending balance $ 851,251 $ 870,495 $ 692,951