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Concentrations (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Concentration Risk [Line Items]    
Concentration risk, number of suppliers   10mgpi_ConcentrationRiskNumberofSuppliers
Number of employees 268dei_EntityNumberOfEmployees 268dei_EntityNumberOfEmployees
Atchison Plant [Member]    
Concentration Risk [Line Items]    
Number of employees 95dei_EntityNumberOfEmployees
/ us-gaap_CollectiveBargainingArrangementAxis
= mgpi_AtchisonPlantMember		  
Indiana Plant [Member]    
Concentration Risk [Line Items]    
Number of employees 48dei_EntityNumberOfEmployees
/ us-gaap_CollectiveBargainingArrangementAxis
= mgpi_IndianaPlantMember		  
Number Of Employees [Member]    
Concentration Risk [Line Items]    
Number of employees   145dei_EntityNumberOfEmployees
/ us-gaap_CollectiveBargainingArrangementAxis
= mgpi_NumberOfEmployeesMember
Ten Largest Customers [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage 46.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= mgpi_TenLargestCustomersMember		 44.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= mgpi_TenLargestCustomersMember
Customer Concentration Risk [Member]    
Concentration Risk [Line Items]    
Concentration risk, number of customers 10mgpi_ConcentrationRiskNumberofCustomers
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember		  
Grain Supplier [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage 35.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= mgpi_GrainSupplierMember		 50.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= mgpi_GrainSupplierMember
Concentration risk, number of suppliers 1mgpi_ConcentrationRiskNumberofSuppliers
/ us-gaap_ConcentrationRiskByTypeAxis
= mgpi_GrainSupplierMember		 1mgpi_ConcentrationRiskNumberofSuppliers
/ us-gaap_ConcentrationRiskByTypeAxis
= mgpi_GrainSupplierMember
Ten Largest Suppliers [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage 70.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= mgpi_TenLargestSuppliersMember		 77.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= mgpi_TenLargestSuppliersMember
Net Sales [Member]    
Concentration Risk [Line Items]    
Concentration risk, percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueGoodsNetMember