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Operating Lease Agreements - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
MXN ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
MXN ($)
Disclosure of operating lease by lessee [Line Items]        
Operating lease rent payable $ 62,948   $ 58,365 $ 66,135
Rental expense 9,044   8,837 7,205
Income recognized from leasing activities $ 2,039,697   $ 1,736,237 $ 1,244,644
Leased office space [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease rent payable   $ 42,523    
Leased office space [Member] | Five year operating lease agreement [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease renewal date 2013-02 2013-02    
Operating lease concluding date 2018-01 2018-01    
Leased office space [Member] | Three year operating lease agreement [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease renewal date 2017-05 2017-05    
Operating lease concluding date 2020-04 2020-04    
Leased office space [Member] | Bottom of Range [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease term 3 years 3 years    
Leased office space [Member] | Top of Range [Member]        
Disclosure of operating lease by lessee [Line Items]        
Operating lease term 5 years 5 years