XML 11 R39.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements - Additional Information (Detail)
Mar. 31, 2015
Dec. 31, 2014
May 13, 2011
Term loan      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading prices rate to calculate the fair value 98.50%cmls_FairValueLiabilitiesMeasuredOnRecurringBasisTradePriceRate
/ us-gaap_FairValueByLiabilityClassAxis
= cmls_TermLoanFacilityOneMember		 97.50%cmls_FairValueLiabilitiesMeasuredOnRecurringBasisTradePriceRate
/ us-gaap_FairValueByLiabilityClassAxis
= cmls_TermLoanFacilityOneMember		  
7.75% senior notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Trading prices rate to calculate the fair value 98.00%cmls_FairValueLiabilitiesMeasuredOnRecurringBasisTradePriceRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SeniorNotesMember		 101.25%cmls_FairValueLiabilitiesMeasuredOnRecurringBasisTradePriceRate
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_SeniorNotesMember		  
7.75% senior notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest on borrowings, per annum 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 7.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember