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Executive Share-based Compensation - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
MXN ($)
shares
Dec. 31, 2017
COP ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2016
COP ($)
Dec. 31, 2015
MXN ($)
Dec. 31, 2015
COP ($)
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items]            
Share-based compensation expense $ 817,000,000   $ 742,000,000   $ 655,000,000  
Commitment payments in cash $ 0   $ 0      
CEMEX Latam Holdings, S.A [member]            
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items]            
Share-based compensation program service period 4 years 4 years        
Share-based compensation shares issued 172,981 172,981 271,461 271,461 242,618 242,618
Share-based compensation shares expected to be issued | shares 798,552          
Weighted average price per granted shares   $ 13,077   $ 13,423   $ 14,291
CPO [Member]            
Disclosure of Terms and Conditions of Share-based Payment Arrangement [Line Items]            
Share-based compensation program service period 4 years 4 years        
Share-based compensation annual grant percentage 25.00% 25.00%        
Share-based compensation shares issued 53,200,000 53,200,000 53,900,000 53,900,000 49,200,000 49,200,000
Share-based compensation shares expected to be issued | shares 79,000,000          
Weighted average price per granted shares $ 14.28   $ 13.79   $ 13.34