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Legal Proceedings - Additional Information (Detail)
$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Jul. 13, 2013
Dec. 31, 2018
MXN ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of Commitments and Contingencies [Line Items]            
Lease contract for a period 5 years          
Long term lease contract period   21 years        
Extended long term lease contract period   10 years        
Cash advances by CEMEX Colombia         $ 13.4  
Interest for advances         1.2  
Purchase of the assets related to the project in Colombian pesos       $ 264.0   $ 14.1
Impairment of assets       295.0 14.3  
Impairment loss   $ 445.0 $ 984.0 1,899.0    
Excluding MOU and the Land MOU [member]            
Disclosure of Commitments and Contingencies [Line Items]            
Impairment loss       43.0 2.3  
CI Calizas [member]            
Disclosure of Commitments and Contingencies [Line Items]            
Reduction of other accounts payable       (188.0) (9.1)  
Bottom of range [member]            
Disclosure of Commitments and Contingencies [Line Items]            
Expiration of property over the aforementioned assets   5 years        
Top of range [member]            
Disclosure of Commitments and Contingencies [Line Items]            
Expiration of property over the aforementioned assets   10 years        
VAT Payable [member]            
Disclosure of Commitments and Contingencies [Line Items]            
Accounts payable       $ 191.0   $ 9.2
Adjustments in accounts payable         $ 5.0