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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, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans (including current portion) $ 9,549,328   $ 10,476,570
Lease liabilities 917,452 $ 1,184,183  
Lease obligations payable     18,000
Guarantee deposits 1,095   1,092
Total 10,467,875   10,495,662
Within 1 year [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans (including current portion) 914,159   927,243
Lease liabilities 36,806    
Lease obligations payable     18,000
Total 950,965   945,243
1 to 3 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans (including current portion) 1,786,842   1,814,344
Lease liabilities 60,111    
Total 1,846,953   1,814,344
3 to 5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Long-term bank loans (including current portion) 6,848,327   7,734,983
Lease liabilities 57,836    
Total 6,906,163   7,734,983
Over 5 years [member]      
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items]      
Lease liabilities 762,699    
Guarantee deposits 1,095   1,092
Total $ 763,794   $ 1,092