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Financial Risk Management - Summary of Exposure to Credit Risk and Expected Credit Losses for Accounts Receivable (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
MXN ($)
Dec. 31, 2018
USD ($)
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets   $ 197,215
Trade receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 1,444,037  
Amount of credit loss $ 33,195  
Current (Not Past Due) [Member] | Trade receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 0.54% 0.54%
Financial assets $ 1,319,676  
Amount of credit loss $ 7,126  
Credit impaired No  
1 to 30 Days Past Due [Member] | Trade receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 4.48% 4.48%
Financial assets $ 70,073  
Amount of credit loss $ 3,141  
Credit impaired No  
31 to 60 Days Past Due [Member] | Trade receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 17.91% 17.91%
Financial assets $ 25,934  
Amount of credit loss $ 4,645  
Credit impaired No  
61 to 90 Days Past Due [Member] | Trade receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 31.00% 31.00%
Financial assets $ 14,482  
Amount of credit loss $ 4,489  
Credit impaired No  
More Than 90 Days Past Due [Member] | Trade receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 15.10% 15.10%
Financial assets $ 92  
Amount of credit loss $ 14  
Credit impaired Yes  
Legal [Member] | Trade receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 100.00% 100.00%
Financial assets $ 13,780  
Amount of credit loss $ 13,780  
Credit impaired Yes