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Summarized Statement of Income Information for Vasconia in USD and MXN (Parenthetical) (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2014
USD ($)
Grupo Vasconia S.A.B.  
Schedule of Equity Method Investments [Line Items]  
Equity method investment, proportionate share of adjustments for net income $ 0.3