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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, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
USD ($)
Disclosure Of Credit Risk Exposure [Line Items]        
Financial assets       $ 498,845
Trade Accounts Receivables [Member]        
Disclosure Of Credit Risk Exposure [Line Items]        
Financial assets $ 1,412,958 $ 1,530,432 $ 1,444,037  
Amount of credit loss $ 146,952 $ 51,022 $ 48,675  
Current (Not Past Due) [Member] | Trade Accounts Receivables [Member]        
Disclosure Of Credit Risk Exposure [Line Items]        
Weighted average loss rate 0.00% 0.00% 0.00% 0.00%
Financial assets $ 1,192,643 $ 1,258,569 $ 1,304,274  
Credit impairment No No No  
1 to 30 Days Past Due [Member] | Trade Accounts Receivables [Member]        
Disclosure Of Credit Risk Exposure [Line Items]        
Weighted average loss rate 8.31% 5.97% 4.48% 8.31%
Financial assets $ 55,461 $ 133,533 $ 70,073  
Amount of credit loss $ 4,611 $ 7,978 $ 3,141  
Credit impairment No No No  
31 to 60 Days Past Due [Member] | Trade Accounts Receivables [Member]        
Disclosure Of Credit Risk Exposure [Line Items]        
Weighted average loss rate 19.14% 13.69% 17.91% 19.14%
Financial assets $ 25,223 $ 91,640 $ 25,934  
Amount of credit loss $ 4,827 $ 12,546 $ 4,645  
Credit impairment No No No  
61 to 90 Days Past Due [Member] | Trade Accounts Receivables [Member]        
Disclosure Of Credit Risk Exposure [Line Items]        
Weighted average loss rate 86.54% 47.48% 80.20% 86.54%
Financial assets $ 15,736 $ 30,832 $ 14,482  
Amount of credit loss $ 13,619 $ 14,640 $ 11,615  
Credit impairment No No No  
More Than 90 Days Past Due [Member] | Trade Accounts Receivables [Member]        
Disclosure Of Credit Risk Exposure [Line Items]        
Weighted average loss rate 100.00% 100.00% 100.00% 100.00%
Financial assets $ 109,759 $ 2,693 $ 15,494  
Amount of credit loss $ 109,759 $ 2,693 $ 15,494  
Credit impairment Yes Yes Yes  
Legal [Member] | Trade Accounts Receivables [Member]        
Disclosure Of Credit Risk Exposure [Line Items]        
Weighted average loss rate 100.00% 100.00% 100.00% 100.00%
Financial assets $ 14,136 $ 13,165 $ 13,780  
Amount of credit loss $ 14,136 $ 13,165 $ 13,780  
Credit impairment Yes Yes Yes