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Machinery, Equipment and Improvements on Leased Buildings - Additional Information (Detail) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Property Plant And Equipment [Abstract]      
Machinery, equipment and improvements on leased buildings $ 0 $ 0 $ 381,427