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Financial Risk Management and Fair Values of Financial Instruments - Maturity Profile of Non-derivative Financial Liabilities Based on Contracted Undiscounted Payments (Detail) - TWD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans $ 8,091,523 $ 9,549,328  
Lease liabilities 1,079,181 917,452 $ 1,184,183
Guarantee deposits 21,670 1,095  
Total 9,192,374 10,467,875  
Within 1 year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans 846,401 914,159  
Lease liabilities 145,594 36,806  
Total 991,995 950,965  
1 to 3 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans 3,558,597 1,786,842  
Lease liabilities 160,146 60,111  
Total 3,718,743 1,846,953  
3 to 5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans 2,198,717 6,848,327  
Lease liabilities 54,689 57,836  
Total 2,253,406 6,906,163  
Over 5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans 1,487,808    
Lease liabilities 718,752 762,699  
Guarantee deposits 21,670 1,095  
Total $ 2,228,230 $ 763,794