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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Affiliate
Nov. 07, 2014
Jan. 02, 2014
Apr. 25, 2014
Sep. 13, 2013
Supply Commitment [Line Items]          
Industry fee to be credited in equal annual installments $ 75.0cmls_IndustryFeeCredit        
Industry fee refund for fees previously paid 70.5cmls_IndustryFeeRefundForFeesPreviouslyPaid        
Number of radio stations 8,500cmls_NumberOfRadioStations        
Country Weekly Acquisition          
Supply Commitment [Line Items]          
Number sellers   1cmls_LongtermPurchaseCommitmentNumberofSellerstoCollaborateonProductionPublicationandDistribution
/ us-gaap_BusinessAcquisitionAxis
= cmls_CountryWeeklyAcquisitionMember		      
Fee for collaboration on the production, publication and distribution of Country Weekly   1.0us-gaap_LongTermPurchaseCommitmentAmount
/ us-gaap_BusinessAcquisitionAxis
= cmls_CountryWeeklyAcquisitionMember		      
Duration of agreement   6 years      
Exit Plan | Contract Termination | Accounts Payable and Accrued Expenses          
Supply Commitment [Line Items]          
Current restructuring liabilities 0.4us-gaap_RestructuringReserveCurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_AccountsPayableAndAccruedLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
/ us-gaap_RestructuringPlanAxis
= cmls_ExitPlanMember		        
Exit Plan | Contract Termination | Non-current liabilities          
Supply Commitment [Line Items]          
Noncurrent restructuring liabilities 4.1us-gaap_RestructuringReserveNoncurrent
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
/ us-gaap_RestructuringPlanAxis
= cmls_ExitPlanMember		        
Merlin Media LLC          
Supply Commitment [Line Items]          
Monthly management fees, first year     0.3cmls_MonthlyManagementFeeExpenseDuringFirstYearUnderAgreement
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember		    
Monthly management fees, second year     0.4cmls_MonthlyManagementFeeExpenseDuringSecondYearUnderAgreement
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember		    
Monthly management fees, third year     0.5cmls_MonthlyManagementFeeExpenseDuringThirdYearUnderAgreement
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember		    
Monthly management fees, fourth year     0.6cmls_MonthlyManagementFeeExpenseDuringFourthYearUnderAgreement
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember		    
Merlin Media LLC | Put Option          
Supply Commitment [Line Items]          
Number of radio stations     2cmls_NumberOfRadioStations
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_PutOptionMember		    
Amount under option agreement to settle management fees     71.0cmls_OptionIndexedtoIssuersEquityAggregateStrikePrice
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_PutOptionMember		 14.8cmls_OptionIndexedtoIssuersEquityAggregateStrikePrice
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_PutOptionMember		  
Period after commencement date to settle management fees     4 years 2 years  
Period to exercise option     10 days 10 days  
Merlin Media LLC | Call Option          
Supply Commitment [Line Items]          
Period after commencement date to settle management fees       18 months  
Merlin Media LLC | Call Option | Maximum          
Supply Commitment [Line Items]          
Amount under option agreement to settle management fees     70.0cmls_OptionIndexedtoIssuersEquityAggregateStrikePrice
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 14.8cmls_OptionIndexedtoIssuersEquityAggregateStrikePrice
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Merlin Media LLC | Call Option | Minimum          
Supply Commitment [Line Items]          
Amount under option agreement to settle management fees     50.0cmls_OptionIndexedtoIssuersEquityAggregateStrikePrice
/ us-gaap_CounterpartyNameAxis
= cmls_MerlinMediaLLCMember
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Universal Media Access, LLC          
Supply Commitment [Line Items]          
Number of radio stations       1cmls_NumberOfRadioStations
/ us-gaap_CounterpartyNameAxis
= cmls_UniversalMediaAccessLLCMember		  
Fixed fee under LMA       1.4us-gaap_ManagementFeesBaseRevenue
/ us-gaap_CounterpartyNameAxis
= cmls_UniversalMediaAccessLLCMember		  
Term under LMA       2 years  
Strategic Promotional Partnership and Ad Sales Arrangement          
Supply Commitment [Line Items]          
Amount of promotion         75.0cmls_OtherCommitmentsPromotionalCommitments
/ us-gaap_OtherCommitmentsAxis
= cmls_StrategicPromotionalPartnershipandAdSalesArrangementMember
Promotion period         5 years
Percentage ownership of fully diluted shares of Pulser equity         15.00%cmls_PercentageEquityReceivedinExchangeforPromotionalCommitments
/ us-gaap_OtherCommitmentsAxis
= cmls_StrategicPromotionalPartnershipandAdSalesArrangementMember
Arbitron          
Supply Commitment [Line Items]          
Remaining aggregate obligation under the agreements with Arbitron $ 135.1cmls_AggregateObligationsOutstanding
/ us-gaap_SupplyCommitmentAxis
= cmls_ArbitronMember