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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, 2019
MXN ($)
Dec. 31, 2019
USD ($)
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets   $ 239,665
Trade Accounts Receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Financial assets $ 1,530,432  
Amount of credit loss $ 48,338  
Current (Not Past Due) [Member] | Trade Accounts Receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 0.70% 0.70%
Financial assets $ 1,261,238  
Amount of credit loss $ 8,867  
Credit impairment No  
1 to 30 Days Past Due [Member] | Trade Accounts Receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 5.97% 5.97%
Financial assets $ 133,533  
Amount of credit loss $ 7,978  
Credit impairment No  
31 to 60 Days Past Due [Member] | Trade Accounts Receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 13.69% 13.69%
Financial assets $ 91,640  
Amount of credit loss $ 12,546  
Credit impairment No  
61 to 90 Days Past Due [Member] | Trade Accounts Receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 18.72% 18.72%
Financial assets $ 30,832  
Amount of credit loss $ 5,773  
Credit impairment No  
More Than 90 Days Past Due [Member] | Trade Accounts Receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 37.50% 37.50%
Financial assets $ 24  
Amount of credit loss $ 9  
Credit impairment Yes  
Legal [Member] | Trade Accounts Receivables [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Weighted average loss rate 100.00% 100.00%
Financial assets $ 13,165  
Amount of credit loss $ 13,165  
Credit impairment Yes