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Redeemable Preferred Stock (Detail) (USD $)
 0 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Apr. 02, 2014
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2013
Apr. 02, 2012
Jan. 31, 2012
Sep. 19, 2012
May 02, 2013
Class of Stock [Line Items]                
Conversion of Stock, Shares Converted 975,848us-gaap_ConversionOfStockSharesConverted1              
Liquidation preference per share of preferred stock   $ 50.00us-gaap_TemporaryEquityLiquidationPreferencePerShare            
Conversion price, per share   $ 20.495emms_ConversionPricePerShare            
Number of shares of Class A common stock converted for each share of Preferred Stock   2.44emms_NumberOfPreferredStockConvertedIntoCommonStock            
Redemption of preferred stock for cash at liquidation preference per share, percentage   100.00%emms_PreferredStockRedemptionPricePercentage            
Aggregate liquidation preference   $ 46,450,000us-gaap_PreferredStockLiquidationPreferenceValue $ 46,450,000us-gaap_PreferredStockLiquidationPreferenceValue          
Authorized share repurchase amount               500,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
Shares repurchased, average cost per share     $ 12.38emms_StockRepurchaseProgramSharesRepurchasedAverageCostperShare          
Gain on extinguishment of stock     300,000emms_StockRepurchaseProgramGainonExtinguishmentofStock          
Stock based compensation expense   2,813,000us-gaap_AllocatedShareBasedCompensationExpense 4,884,000us-gaap_AllocatedShareBasedCompensationExpense 2,942,000us-gaap_AllocatedShareBasedCompensationExpense        
Preferred Stock, shares purchased and retired 400,000emms_PreferredStockRepurchasedAndRetiredDuringPeriodShares              
Preferred Stock outstanding   928,991us-gaap_PreferredStockSharesOutstanding 1,337,641us-gaap_PreferredStockSharesOutstanding          
Series A preferred stock                
Class of Stock [Line Items]                
Shares repurchased   8,650emms_PurchaseOfPreferredStockShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesAPreferredStockMember		            
2012 Retention Plan                
Class of Stock [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   975,848us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_EnergyAxis
= emms_RetentionPlanMember		            
Contribution of preferred stock to trust         400,000emms_PreferredStockContributedToTrustRelatedToRetentionPlan
/ us-gaap_EnergyAxis
= emms_RetentionPlanMember		      
Distribution period         2 years      
Stock based compensation expense   $ 400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_EnergyAxis
= emms_RetentionPlanMember		 $ 2,200,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_EnergyAxis
= emms_RetentionPlanMember		 $ 700,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_EnergyAxis
= emms_RetentionPlanMember		        
Voting And Transfer Restriction Agreement                
Class of Stock [Line Items]                
Number of shares of Class A common stock converted for each share of Preferred Stock     2.44emms_NumberOfPreferredStockConvertedIntoCommonStock
/ us-gaap_EnergyAxis
= emms_VotingAndTransferRestrictionAgreementMember		          
Number of shares Entity have the ability to direct vote     400,000emms_EntityAbilityToDirectVotePreferredStockNumber
/ us-gaap_EnergyAxis
= emms_VotingAndTransferRestrictionAgreementMember		          
Right to exchange, number of convertible preferred stock     400,000us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_EnergyAxis
= emms_VotingAndTransferRestrictionAgreementMember		          
Swap and Voting Agreement                
Class of Stock [Line Items]                
Number of shares Entity have the ability to direct vote       1,484,679emms_EntityAbilityToDirectVotePreferredStockNumber
/ us-gaap_EnergyAxis
= emms_SwapAndVotingAgreementMember		        
Preferred Stock right purchased           1,871,529emms_PreferredStockRightPurchased
/ us-gaap_EnergyAxis
= emms_SwapAndVotingAgreementMember		    
Preferred Stock, weighted average price           $ 15.64emms_WeightedAveragePurchasePriceOfStockPurchased
/ us-gaap_EnergyAxis
= emms_SwapAndVotingAgreementMember		    
Preferred Stock, shares purchased and retired           386,850emms_PreferredStockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_EnergyAxis
= emms_SwapAndVotingAgreementMember		    
Percent of shares Entity have the ability to direct vote       61.00%us-gaap_VariableInterestEntityOwnershipPercentage
/ us-gaap_EnergyAxis
= emms_SwapAndVotingAgreementMember		        
Termination of Total Returns Swaps                
Class of Stock [Line Items]                
Preferred Stock right purchased             1,484,679emms_PreferredStockRightPurchased
/ us-gaap_AwardTypeAxis
= emms_TerminationOfReturnsSwapsMember