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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, 2021
Dec. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Short-term bank loans $ 733,523  
Long-term bank loans 9,766,486 $ 8,091,523
Lease liabilities 1,047,811 1,079,181
Guarantee deposits 21,625 21,670
Total 11,569,445 9,192,374
Within 1 year [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Short-term bank loans 733,523  
Long-term bank loans 114,953 846,401
Lease liabilities 182,186 145,594
Total 1,030,662 991,995
1 to 3 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 2,817,662 3,558,597
Lease liabilities 119,748 160,146
Total 2,937,410 3,718,743
3 to 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 4,568,521 2,198,717
Lease liabilities 54,113 54,689
Total 4,622,634 2,253,406
Over 5 years [member]    
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]    
Long-term bank loans 2,265,350 1,487,808
Lease liabilities 691,764 718,752
Guarantee deposits 21,625 21,670
Total $ 2,978,739 $ 2,228,230