Summarized Balance Sheet Information for Vasconia in USD and MXN (Detail) - Grupo Vasconia S.A.B. MXN in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 MXN	Dec. 31, 2015 USD ($)	Dec. 31, 2015 MXN
Schedule of Equity Method Investments [Line Items]
Current assets	$ 81,509	MXN 1,687,396	$ 100,482	MXN 1,745,922
Non-current assets	83,890	1,736,681	87,118	1,513,724
Current liabilities	31,303	648,028	38,983	677,355
Non-current liabilities	$ 49,408	MXN 1,022,842	$ 56,339	MXN 978,910