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Summarized Statement of Income Information for Vasconia in USD and MXN (Detail) - Grupo Vasconia S.A.B.
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
MXN ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
MXN ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
MXN ($)
Schedule of Equity Method Investments [Line Items]            
Net sales $ 167,283 $ 3,157,671 $ 149,533 $ 2,795,009 $ 178,832 $ 2,824,399
Gross profit 34,626 655,186 27,205 510,617 33,982 534,285
Income from operations 10,475 199,170 5,611 105,334 10,551 165,507
Net income $ 1,164 $ 23,983 $ 3,491 $ 68,230 $ 7,353 $ 117,194