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Land, furniture and equipment - Net: Right-of-use assets of leasing assets (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
MXN ($)
Jan. 01, 2019
Disclosure of quantitative information about right-of-use assets [line items]      
Weighted average interest rates of the lessee applied to lease liabilities     9.04%
Current lease liabilities   $ 20,422  
Corporate offices      
Disclosure of quantitative information about right-of-use assets [line items]      
Lease term of contract 5 years 5 years  
Amount of monthly operating lease payments $ 23,194 $ 437  
Number of months rent for security deposit 2 months 2 months  
Commercial vehicles      
Disclosure of quantitative information about right-of-use assets [line items]      
Lease term of contract 48 months 48 months  
Percentage of default monthly interest rate in th event of nonpayment of lease payment 3.00% 3.00%