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Corporate Borrowings And Capital Lease Obligations (Detail) (USD $)
0 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 15 Months Ended 0 Months Ended
Nov. 02, 2012
Jun. 28, 2011
Jul. 20, 2009
Dec. 28, 2006
Dec. 31, 2007
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Feb. 12, 2014
Jun. 30, 2014
Aug. 05, 2014
Feb. 27, 2015
Debt Instrument [Line Items]                        
Payments of Debt Issuance Costs           $ (66,000)us-gaap_PaymentsOfDebtIssuanceCosts            
Amount outstanding     2,000,000us-gaap_LineOfCredit       6,670,000us-gaap_LineOfCredit          
Remaining borrowing capacity             42,744,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity          
Interest rate 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage           2.54%us-gaap_DebtInstrumentInterestRateStatedPercentage 2.52%us-gaap_DebtInstrumentInterestRateStatedPercentage        
Commitment fee percentage 0.375%us-gaap_LineOfCreditFacilityCommitmentFeePercentage                      
Number of installment loan payments     84 months                  
Repayments of debt     32,000us-gaap_RepaymentsOfDebt                  
Sale Leaseback Transaction, Gross Proceeds, Financing Activities   7,335,000us-gaap_SaleLeasebackTransactionGrossProceedsFinancingActivities                    
Sale leaseback transaction, monthly rental payments   110,000us-gaap_SaleLeasebackTransactionMonthlyRentalPayments                    
Sale leaseback transaction, lease terms   P60M                    
Sale leaseback transaction, imputed interest rate   2.61%us-gaap_SaleLeasebackTransactionImputedInterestRate     4.90%us-gaap_SaleLeasebackTransactionImputedInterestRate              
Leveraged leases, net investment in leveraged leases disclosure, residual value of leased assets   1,328,000us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets                    
Lessee Leasing Arrangements, Operating Leases, Contract Terms, Acceleration in the Event of Default, Number of Days in Default             10 days          
Sale leaseback transaction, gross proceeds       7,000,000us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities                
Sale leaseback transaction, other payments required         50,000us-gaap_SaleLeasebackTransactionOtherPaymentsRequired              
Sale leaseback admin fee payment period             10 years          
Operating leases, rent expense             2,241,000us-gaap_LeaseAndRentalExpense 2,844,000us-gaap_LeaseAndRentalExpense        
Special assessment bond       7,000,000us-gaap_SpecialAssessmentBond                
Revolving Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity             55,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
         
Amount outstanding             0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
         
Minimum Under Loan Covenant [Member]                        
Debt Instrument [Line Items]                        
Required excess availability 9,625,000mgpi_LineOfCreditFacilityRequiredExcessAvailability
/ us-gaap_CreditFacilityAxis
= mgpi_MinimumUnderLoanCovenantMember
                     
Wells Fargo Bank [Member]                        
Debt Instrument [Line Items]                        
Line of Credit Facility, Covenant Compliance, Maximum Governance Expenses Included in Earnings Before Interest, Taxes, Depreciation and Amortization               5,500,000mgpi_LineofCreditFacilityCovenantComplianceMaximumGovernanceExpensesIncludedinEarningsBeforeInterestTaxesDepreciationandAmortization
/ us-gaap_CreditFacilityAxis
= mgpi_WellsFargoBankMember
6,000mgpi_LineofCreditFacilityCovenantComplianceMaximumGovernanceExpensesIncludedinEarningsBeforeInterestTaxesDepreciationandAmortization
/ us-gaap_CreditFacilityAxis
= mgpi_WellsFargoBankMember
     
Litigation Settlement, Expense             0us-gaap_LitigationSettlementExpense
/ us-gaap_CreditFacilityAxis
= mgpi_WellsFargoBankMember
5,465,000us-gaap_LitigationSettlementExpense
/ us-gaap_CreditFacilityAxis
= mgpi_WellsFargoBankMember
  5,465,000us-gaap_LitigationSettlementExpense
/ us-gaap_CreditFacilityAxis
= mgpi_WellsFargoBankMember
   
Amount outstanding             0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= mgpi_WellsFargoBankMember
18,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= mgpi_WellsFargoBankMember
       
Line of Credit Facility, Covenant Compliance, Fixed Charge Coverage Ratio             1.10mgpi_LineofCreditFacilityCovenantComplianceFixedChargeCoverageRatio
/ us-gaap_CreditFacilityAxis
= mgpi_WellsFargoBankMember
         
Line of Credit [Member]                        
Debt Instrument [Line Items]                        
Debt Conversion, Original Debt, Amount                     7,004,000us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Amount outstanding             6,670,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
         
Original Loan Amount [Member]                        
Debt Instrument [Line Items]                        
Amount outstanding     1,500,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= mgpi_OriginalLoanAmountMember
                 
Percentage Amount Over LIBOR [Member]                        
Debt Instrument [Line Items]                        
Interest rate 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mgpi_PercentageAmountOverLIBORMember
                     
Three Year Treasury Index [Member]                        
Debt Instrument [Line Items]                        
Interest rate     6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mgpi_ThreeYearTreasuryIndexMember
                 
Water Cooling System Sale Leaseback [Member]                        
Debt Instrument [Line Items]                        
Sale leaseback transaction, lease terms   P72M                    
Minimum [Member] | Percentage Amount Over LIBOR [Member]                        
Debt Instrument [Line Items]                        
Interest rate 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mgpi_PercentageAmountOverLIBORMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
                     
Minimum [Member] | Percentage Amount Over Federal Funds Rate [Member]                        
Debt Instrument [Line Items]                        
Interest rate 0.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mgpi_PercentageAmountOverFederalFundsRateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
                     
Maximum [Member] | Percentage Amount Over LIBOR [Member]                        
Debt Instrument [Line Items]                        
Interest rate 2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mgpi_PercentageAmountOverLIBORMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                     
Line of Credit [Member] | Payment Guarantee [Member] | Wells Fargo Bank [Member] | Subsequent Event [Member] | Restated Credit Agreement [Member] | Revolving Credit Facility [Member]                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity                       $ 80,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= mgpi_RestatedCreditAgreementMember
/ us-gaap_GuaranteeObligationsByNatureAxis
= us-gaap_PaymentGuaranteeMember
/ us-gaap_LineOfCreditFacilityAxis
= mgpi_WellsFargoBankMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Debt Instrument, Term                       5 years
Variable Interest Rate [Member]                        
Debt Instrument [Line Items]                        
Interest rate             6.76%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ mgpi_PromissoryNotePaybleTermsAxis
= mgpi_VariableInterestRateMember
6.76%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ mgpi_PromissoryNotePaybleTermsAxis
= mgpi_VariableInterestRateMember