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Investment in associate - Schedule of Investment in Associate (Detail) - MXN ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Significant Investments In Associates [Abstract]      
Initial investment     $ 105,936
Share of profit (loss) of associate $ 2,855 $ (11,728) (13,704)
Beginning Balance 21,636 92,232  
Reimbursements 2016   (58,868)  
Ending Balance 11,016 $ 21,636 $ 92,232
Adjustment to the investment SCL $ (13,475)