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Long-term Debt - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2014
Nov. 30, 2013
Jun. 10, 2014
Feb. 28, 2014
May 30, 2012
Jun. 16, 2014
Dec. 28, 2012
Debt Instrument                  
Loss on termination of credit agreement $ 0us-gaap_GainsLossesOnExtinguishmentOfDebt $ (653,000)us-gaap_GainsLossesOnExtinguishmentOfDebt $ (1,455,000)us-gaap_GainsLossesOnExtinguishmentOfDebt $ (653,000)us-gaap_GainsLossesOnExtinguishmentOfDebt          
Unamortized discount on issuance of debt 6,648,000us-gaap_DebtInstrumentUnamortizedDiscount   6,648,000us-gaap_DebtInstrumentUnamortizedDiscount     1,475,000us-gaap_DebtInstrumentUnamortizedDiscount      
98.7FM Non-recourse debt                  
Debt Instrument                  
Face amount of debt             82,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= emms_A98.7FMNonrecoursedebtMember
   
Interest rate during period             4.10%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= emms_A98.7FMNonrecoursedebtMember
   
Non-recourse debt 71,567,000us-gaap_NonRecourseDebt
/ us-gaap_LongtermDebtTypeAxis
= emms_A98.7FMNonrecoursedebtMember
  71,567,000us-gaap_NonRecourseDebt
/ us-gaap_LongtermDebtTypeAxis
= emms_A98.7FMNonrecoursedebtMember
    74,942,000us-gaap_NonRecourseDebt
/ us-gaap_LongtermDebtTypeAxis
= emms_A98.7FMNonrecoursedebtMember
     
Digonex Non-recourse debt                  
Debt Instrument                  
Face amount of debt               6,200,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= emms_DigonexNonrecoursedebtMember
 
Interest rate during period               5.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= emms_DigonexNonrecoursedebtMember
 
Non-recourse debt 3,786,000us-gaap_NonRecourseDebt
/ us-gaap_LongtermDebtTypeAxis
= emms_DigonexNonrecoursedebtMember
  3,786,000us-gaap_NonRecourseDebt
/ us-gaap_LongtermDebtTypeAxis
= emms_DigonexNonrecoursedebtMember
    0us-gaap_NonRecourseDebt
/ us-gaap_LongtermDebtTypeAxis
= emms_DigonexNonrecoursedebtMember
  3,600,000us-gaap_NonRecourseDebt
/ us-gaap_LongtermDebtTypeAxis
= emms_DigonexNonrecoursedebtMember
 
Digonex Non-recourse debt | Non-recourse debt                  
Debt Instrument                  
Face amount of debt 6,200,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= emms_DigonexNonrecoursedebtMember
/ us-gaap_LongtermDebtTypeAxis
= emms_NonRecourseDebtMember
  6,200,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= emms_DigonexNonrecoursedebtMember
/ us-gaap_LongtermDebtTypeAxis
= emms_NonRecourseDebtMember
           
Two Thousand Twelve Credit Agreement                  
Debt Instrument                  
Maximum borrowing capacity                 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandTwelveCreditAgreementMember
Loss on termination of credit agreement     (1,455,000)us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandTwelveCreditAgreementMember
           
Two Thousand Twelve Credit Agreement | Term Loan                  
Debt Instrument                  
Maximum borrowing capacity                 80,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= emms_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandTwelveCreditAgreementMember
Two Thousand Twelve Credit Agreement | Revolver                  
Debt Instrument                  
Maximum borrowing capacity                 20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandTwelveCreditAgreementMember
Two Thousand Twelve Credit Agreement | Letter of Credit                  
Debt Instrument                  
Maximum borrowing capacity                 5,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandTwelveCreditAgreementMember
Two Thousand Fourteen Credit Agreement                  
Debt Instrument                  
Provision for credit facility increase         20,000,000emms_LineOfCreditFacilityBorrowingCapacityIncreaseLimit
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
Borrowings on revolving credit facility         13,000,000emms_Borrowingsonrevolvingcreditfacility
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
Percentage of principal due in quarterly installments     1.00%emms_DebtInstrumentPeriodicPaymentPercentageofPrincipalDueinQuarterlyInstallments
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
           
Commitment fee     5000.00%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
           
Amortization of financing costs     1,000,000us-gaap_AmortizationOfFinancingCosts
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
           
Unamortized discount on issuance of debt 6,600,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
  6,600,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
  6,100,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
Two Thousand Fourteen Credit Agreement | Term Loan                  
Debt Instrument                  
Maximum borrowing capacity         185,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= emms_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
Face amount of debt         185,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= emms_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
Proceeds from issuance of debt         109,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_CreditFacilityAxis
= emms_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
Long-term debt held in escrow         76,000,000emms_DebtInstrumentLongtermDebtHeldinEscrow
/ us-gaap_CreditFacilityAxis
= emms_TermLoanMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
Two Thousand Fourteen Credit Agreement | Revolver                  
Debt Instrument                  
Maximum borrowing capacity         20,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
Two Thousand Fourteen Credit Agreement | Letter of Credit                  
Debt Instrument                  
Maximum borrowing capacity         5,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
       
First Amendment to Two Thousand Fourteen Credit Agreement                  
Debt Instrument                  
Debt covenant increased leverage ratio amount     6.00emms_DebtInstrumentDebtCovenantLeverageRatioMaximum
/ us-gaap_DebtInstrumentAxis
= emms_FirstAmendmenttoTwoThousandFourteenCreditAgreementMember
           
Debt covenant maximum severance expense excluded from consolidated EBITDA     5,000,000emms_DebtInstrumentDebtCovenantConsolidatedEarningsBeforeInterestTaxesDepreciationandAmortizationSeveranceExpenseMaximum
/ us-gaap_DebtInstrumentAxis
= emms_FirstAmendmenttoTwoThousandFourteenCreditAgreementMember
           
Debt covenant, maximum losses attributable to reformatting of radio stations included in consolidated EBITDA     2,500,000.0emms_DebtInstrumentDebtCovenantConsolidatedEarningsBeforeInterestTaxesDepreciationandAmortizationLossesAttributabletoReformattingofStationsMaximum
/ us-gaap_DebtInstrumentAxis
= emms_FirstAmendmenttoTwoThousandFourteenCreditAgreementMember
           
Prepayment fee, percentage     1.00%emms_DebtInstrumentPrepaymentFeePercentage
/ us-gaap_DebtInstrumentAxis
= emms_FirstAmendmenttoTwoThousandFourteenCreditAgreementMember
           
Increase in basis spread on variable rate     0.25%emms_DebtInstrumentIncreaseinBasisSpreadonVariableRate
/ us-gaap_DebtInstrumentAxis
= emms_FirstAmendmenttoTwoThousandFourteenCreditAgreementMember
           
Debt covenant, leverage ratio threshold for applicable margin     5.00emms_DebtInstrumentDebtCovenantLeverageRatioThreshold
/ us-gaap_DebtInstrumentAxis
= emms_FirstAmendmenttoTwoThousandFourteenCreditAgreementMember
           
Base Rate | Two Thousand Fourteen Credit Agreement                  
Debt Instrument                  
Minimum interest rate as a percentage     2.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
Basis spread on interest rate     3.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
           
London Interbank Offered Rate (LIBOR) | Two Thousand Fourteen Credit Agreement                  
Debt Instrument                  
Minimum interest rate as a percentage     1.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
Basis spread on interest rate     4.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= emms_TwoThousandFourteenCreditAgreementMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
           
WBLS-FM and WLIB-AM                  
Debt Instrument                  
Cash paid at first closing         55,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= emms_WBLSFMandWLIBAMMember
       
Cash payable at second closing         $ 76,000,000emms_ExpectedPaymenttoAcquireBusinessGross
/ us-gaap_BusinessAcquisitionAxis
= emms_WBLSFMandWLIBAMMember