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Equity Method Investments (Detail) - The Company's Investment in Joint Ventures (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]    
Equity Method Investments $ 13,673us-gaap_EquityMethodInvestments $ 12,373us-gaap_EquityMethodInvestments
ICP [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investments 13,252us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mgpi_IllinoisCornProcessingsLLCMember		 11,924us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mgpi_IllinoisCornProcessingsLLCMember
DMI [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investments $ 421us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mgpi_DMIMember		 $ 449us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mgpi_DMIMember