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Commitments and Contingencies - Summary of Guarantees Received from Financial Institutions (Detail) - Dec. 31, 2020
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Disclosure of detailed information about borrowings [line items]    
Guarantees limit ₩ 1,205,141 $ 72,045
Performance guarantee [member] | Seoul Guarantee Insurance and others [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 208,386  
Performance guarantee [member] | Korea Development Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit | $   8,569
Performance guarantee [member] | Seoul guarantee insurance [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 9,690  
Guarantee for import letters of credit [member] | Industrial Bank of Korea and others [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit | $   5,000
Guarantee for payment in foreign currency [member] | KEB Hana Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit | $   40,840
Comprehensive credit line [member] | KEB Hana Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 41,100 8,700
Bid guarantee [member] | KEB Hana Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit | $   400
Bid guarantee [member] | Korea Software Financial Cooperative and others [Member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 80,246  
Performance guarantee/Warrant guarantee [member] | Korea Software Financial Cooperative and others [Member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 393,019  
Guarantee for advance payments/others [member] | Korea Software Financial Cooperative and others [Member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 388,656  
Guarantees for licensing [member] | Seoul guarantee insurance [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 7,748  
Warranty guarantee [member] | Seoul guarantee insurance [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 1,305  
Merchant business guarantee insurance [member] | Seoul guarantee insurance [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 237  
Guarantee for payment in won currency [Member] | Shinhan Bank and others [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit 70,962  
Refund guarantee for advances received [Member] | Korea Development Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit | $   $ 8,536
Guarantees for depositions [Member] | Seoul guarantee insurance [member]    
Disclosure of detailed information about borrowings [line items]    
Guarantees limit ₩ 3,792