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Leases - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2018
MXN ($)
Disclosure of operating lease by lessee [Line Items]        
Expense $ 12,250   $ 12,004 $ 9,044
Income recognized from leasing activities $ 1,748,493   $ 2,859,958 $ 2,376,820
Leased office space [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease rent payable   $ 42,523    
Leased office space [Member] | Three year operating lease agreement [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease renewal date 2018-02 2018-02    
Operating lease concluding date 2023-01 2023-01    
Leased office space [Member] | Five year operating lease agreement [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease renewal date 2020-05 2020-05    
Operating lease concluding date 2023-04 2023-04    
Leased office space [Member] | Top of Range [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease term 5 years 5 years    
Leased office space [Member] | Bottom of Range [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease term 3 years 3 years