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Summary of Preliminary Purchase Price Allocation (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Aug. 01, 2014
Business Acquisition [Line Items]          
Goodwill $ 1,252,694us-gaap_Goodwill $ 1,253,823us-gaap_Goodwill $ 1,253,823us-gaap_Goodwill $ 1,256,741us-gaap_Goodwill  
Wise Brother Media Inc          
Business Acquisition [Line Items]          
Property and equipment         50us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember
Deferred income taxes         100us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember
Other intangible assets         5,025us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember
Goodwill         475us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember
Current liabilities         (75)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember
Other liabilities         (75)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember
Total purchase price         $ 5,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember