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Derivative Financial Instruments - Additional Information (Detail)
$ in Millions
 12 Months Ended
Feb. 14, 2020
MXN ($)
Feb. 13, 2020
MXN ($)
Feb. 27, 2019
MXN ($)
Feb. 26, 2019
MXN ($)
May 04, 2017
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Dec. 31, 2020
USD ($)
Jun. 25, 2020
MXN ($)
Mar. 02, 2020
MXN ($)
May 02, 2017
MXN ($)
Feb. 29, 2016
USD ($)
Jan. 31, 2016
MXN ($)
Jan. 31, 2016
USD ($)
Feb. 28, 2015
MXN ($)
Disclosure of detailed information about financial instruments [Line Items]                                
Issuance of debt securities           $ 17,000,000,000 $ 12,000,000,000 $ 9,000,000,000                
Description of derivative instruments variable interest rate basis   Interest will be payable every 28 days at a variable rate of TIIE-28 plus 17 basis points                            
Derivative financial instrument basis points   17.00%                            
Unsecured credit agreement $ 2,200,000 $ 3,000,000             $ 191.0 $ 4,200,000            
Description of loan agreement maturity date           with monthly interest payments, for a term of 5 years                    
Gain (loss) on derivative financial instruments           $ 43,778,000 $ 149,770,000 29,642,000                
Amount recognized as derivative in other comprehensive income               $ 0                
Capitalization interest rate one           1.75% 1.75% 1.75% 1.75%              
Amount recognized as application of coverage in finance and interest income           $ 6,376,000 $ 19,275,000 $ 9,919,000                
Gain (loss) on sale of derivatives           29,100,000 97,449,000 $ 115,938,000                
Interest rate swaps [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Amount recognized as derivative finance income (cost)           51,032,000 559,000                  
Cash flow hedge [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Reserve for loss of the fair value           $ 471,107,000 $ 172,094,000                  
TIIE Rate [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Interest rate     8.03% 8.0315%             6.33% 7.21%        
TIIE 28 [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Capitalization interest rate one           5.75% 5.75% 5.75% 5.75%              
Amount recognized as application of coverage in finance and interest income           $ 2,750,000 $ 22,305,000 $ 22,856,000                
TIIE Rate Plus 49 Basis Point [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Description of derivative instruments variable interest rate basis           debt securities were placed at a 28-day TIIE variable rate plus 49 basis points                    
Debt instrument interest rate         7.21%                      
TIIE Rate Plus 49 Basis Point [Member] | Interest rate swaps [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Gain (loss) on sale of derivatives           $ 963,000 17,300,000 $ 11,517,000                
Amount recognized as derivative finance income (cost)           $ 21,934,000                    
TIIE Rate Plus 44 Basis Point [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Description of derivative instruments variable interest rate basis           debt securities were placed at a 28-day TIIE variable rate plus 44 basis points                    
Debt instrument interest rate       8.0315%                        
TIIE Rate Plus 44 Basis Point [Member] | Interest rate swaps [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Gain (loss) on sale of derivatives             6,450,000                  
TIIE Variable Rate Plus 45 Basis Point [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Description of derivative instruments variable interest rate basis           debt securities were placed at a 28-day TIIE variable rate plus 45 basis points                    
Debt instrument interest rate     8.03%                          
TIIE Variable Rate Plus 45 Basis Point [Member] | Interest rate swaps [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Amount recognized as derivative finance income (cost)             6,828,000                  
TIIE Variable Rate Plus 45 Basis Point [Member] | Cash flow hedge [Member] | Interest rate swaps [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Amount recognized as derivative finance income (cost)           $ 67,027,000 $ 725,000                  
TIIE Rate Plus 17 Basis Point [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Description of derivative instruments variable interest rate basis           debt securities certificates were placed at a 28-day TIIE variable rate plus 17 basis points                    
Debt instrument interest rate       6.332%                        
TIIE Rate Plus 17 Basis Point [Member] | Interest rate swaps [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Gain (loss) on sale of derivatives           $ 5,567,000                    
Amount recognized as derivative finance income (cost)           $ 24,513,000                    
Scotiabank [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Unsecured credit agreement                             $ 95.5  
Scotiabank [Member] | TIIE 28 [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Capitalization interest rate one             5.75% 5.75%                
BBVA [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Unsecured credit agreement                         $ 95.5      
Nova Scotiabank And BBVA [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Borrowings interest rate basis           Libor 1M plus 99 and 105 basis points                    
Debt securities [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Debt securities, value     $ 3,000,000,000 $ 2,300,000,000             $ 3,000,000,000 $ 1,500,000,000        
Floor [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Collar category interest rate 4.05%                              
Floor [Member] | Nova Scotiabank And BBVA [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Collar category interest rate           0.42%                    
CAP I [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Collar category interest rate 5.75%                              
CAP I [Member] | Nova Scotiabank And BBVA [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Collar category interest rate           1.75%                    
CAP [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Collar category interest rate 6.75%                              
CAP [Member] | Nova Scotiabank And BBVA [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Collar category interest rate           2.75%                    
Tranche One [Member] | Unsecured Debt Securities G A P 15 [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Issuance of debt securities                               $ 1,100,000,000
Tranche Two [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Description of derivative instruments variable interest rate basis           Generates interest at a variable rate of TIIE-28 plus 24 basis points with a term of 5 years                    
Derivative financial instrument basis points           0.24%     0.24%              
Description on period of derivative financial instruments variable interest rate           Term of 5 years                    
Tranche Two [Member] | Unsecured Debt Securities G A P 15 [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Issuance of debt securities                           $ 1,100,000,000    
Unsecured Debt Securities G A P 15 [Member] | Debt securities [Member]                                
Disclosure of detailed information about financial instruments [Line Items]                                
Issuance of debt securities       $ 2,200,000,000