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Stockholders' Equity - Detail of Cemex's Perpetual Debentures, Excluding Perpetual Debentures Held by Subsidiaries (Detail)
 12 Months Ended
Dec. 31, 2017
USD ($)
Anniversaries
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
C10-EUR Capital (SPV) Ltd [Member]        
Disclosure of Perpetual Debentures [Line Items]        
Issuance date 2007-05      
Nominal amount | €   € 64,000,000   € 64,000,000
Repurchase option 10      
Interest rate 4.79% 4.79%    
LIBOR [Member] | C8 Capital (SPV) Ltd [Member]        
Disclosure of Perpetual Debentures [Line Items]        
Issuance date 2007-02      
Nominal amount | $ $ 135,000,000   $ 135,000,000  
Repurchase option 8      
Interest rate 4.40% 4.40%    
LIBOR [Member] | C5 Capital (SPV) Ltd [Member]        
Disclosure of Perpetual Debentures [Line Items]        
Issuance date 2006-12      
Nominal amount | $ $ 61,000,000   61,000,000  
Repurchase option 5      
Interest rate 4.277% 4.277%    
LIBOR [Member] | C10 Capital (SPV) Ltd [Member]        
Disclosure of Perpetual Debentures [Line Items]        
Issuance date 2006-12      
Nominal amount | $ $ 175,000,000   $ 175,000,000  
Repurchase option 10      
Interest rate 4.71% 4.71%