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Commitments and Contingencies - Summary of Guarantees Received from Financial Institutions (Detail) - Dec. 31, 2017
zł in Thousands, $ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
PLN (zł)
Disclosure of detailed information about borrowings [Line Items]      
Limit ₩ 681,280 $ 69,141 zł 23,000
Performance guarantee [Member] | Seoul Guarantee Insurance and others [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit 116,787 1,275  
Guarantee for import letters of credit [Member] | Industrial Bank of Korea and others [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit | $   5,980  
Guarantee for payment in foreign currency [Member] | KEB Hana Bank and others [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit   54,072 zł 23,000
Guarantee for advances received [Member] | Export-Import Bank of Korea [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit | $   7,414  
Comprehensive credit line [Member] | KEB Hana Bank and others [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit 55,000    
Bid guarantee [Member] | KEB Hana Bank [member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit | $   $ 400  
Bid guarantee [Member] | Korea Software Financial Cooperative [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit 96,911    
Performance guarantee/Warrant guarantee [Member] | Korea Software Financial Cooperative [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit 302,062    
Guarantee for advances received/Others [Member] | Korea Software Financial Cooperative and others [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit 99,228    
Warrant guarantee [Member] | Seoul Guarantee Insurance [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit 2,962    
Guarantees for licensing [Member] | Seoul Guarantee Insurance [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit 4,077    
Guarantees for public sale [Member] | Seoul Guarantee Insurance [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit 50    
Guarantees for deposits [Member] | Seoul Guarantee Insurance and others [Member]      
Disclosure of detailed information about borrowings [Line Items]      
Limit ₩ 4,203