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Leases Obligations - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
MXN ($)
Disclosure Of Leases Obligations [Line Items]  
Lease agreements, average discount interest rate 8.38%
Interest on liability for lease $ 3,733
Bottom of Range [Member]  
Disclosure Of Leases Obligations [Line Items]  
Average lease term 3 years
Top of Range [Member]  
Disclosure Of Leases Obligations [Line Items]  
Average lease term 5 years