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Related Party Transactions (Detail) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 03, 2013
Dec. 04, 2014
Nov. 02, 2012
Jul. 18, 2009
Jul. 20, 2009
Related Party Transaction [Line Items]              
Accounts payable to affiliate, net $ 3,333,000us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent $ 1,204,000us-gaap_AccountsPayableRelatedPartiesCurrentAndNoncurrent          
Related party expenses 34,615,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty 7,736,000us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty          
Distribution received from equity method investee 4,835,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 0us-gaap_EquityMethodInvestmentDividendsOrDistributions          
Interest rate 2.54%us-gaap_DebtInstrumentInterestRateStatedPercentage 2.52%us-gaap_DebtInstrumentInterestRateStatedPercentage     1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage    
Prior Loan [Member]              
Related Party Transaction [Line Items]              
Notes payable, related parties           1,500,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= mgpi_PriorLoanMember		  
Additional Borrowing [Member]              
Related Party Transaction [Line Items]              
Notes payable, related parties             2,000,000us-gaap_NotesPayableRelatedPartiesCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= mgpi_AdditionalBorrowingMember
Union State Bank Bank Of Atchison [Member]              
Related Party Transaction [Line Items]              
Secured debt 404,000us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= mgpi_UnionStateBankBankOfAtchisonMember		 746,000us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= mgpi_UnionStateBankBankOfAtchisonMember		          
Former Chief Executive Officer [Member]              
Related Party Transaction [Line Items]              
Accrued costs for settlement agreement   915,000us-gaap_LitigationReserve
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mgpi_FormerChiefExecutiveOfficerMember		          
Union State Bank Bank Of Atchison [Member]              
Related Party Transaction [Line Items]              
Interest rate 6.76%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= mgpi_UnionStateBankBankOfAtchisonMember		            
Settlement Agreement [Member]              
Related Party Transaction [Line Items]              
Related party expenses     3,701us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mgpi_SettlementAgreementMember		        
Due to Related Party, Reasonable Out-of-pocket Expense Reimbursement, Expense Cap Amount     1,775mgpi_DuetoRelatedPartyReasonableOutofpocketExpenseReimbursementExpenseCapAmount
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mgpi_SettlementAgreementMember		        
Reimbursement requests submitted and accrued for   1,764,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mgpi_SettlementAgreementMember		          
ICP [Member]              
Related Party Transaction [Line Items]              
Distribution received from equity method investee       $ 4,835,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= mgpi_IllinoisCornProcessingsLLCMember