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Equity Method Investments (Detail) - The Company’s Investment in Joint Ventures (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Intestments In joint ventures $ 12,373us-gaap_EquityMethodInvestments $ 7,123us-gaap_EquityMethodInvestments
ICP (30% interest) [Member]    
Schedule of Equity Method Investments [Line Items]    
Intestments In joint ventures 11,924us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= mgpi_IllinoisCornProcessingsLLCMember		 6,653us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= mgpi_IllinoisCornProcessingsLLCMember
DMI (50% interest) [Member]    
Schedule of Equity Method Investments [Line Items]    
Intestments In joint ventures $ 449us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= mgpi_DMIngredientsGmbHMember		 $ 470us-gaap_EquityMethodInvestments
/ dei_LegalEntityAxis
= mgpi_DMIngredientsGmbHMember