XML 64 R27.htm IDEA: XBRL DOCUMENT v2.4.1.9
Acquisitions and Dispositions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Nov. 07, 2014
Aug. 01, 2014
Country Weekly Acquisition    
Business Acquisition [Line Items]    
Total purchase price $ 3.0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= cmls_CountryWeeklyAcquisitionMember
 
Wise Brother Media Inc    
Business Acquisition [Line Items]    
Total purchase price   $ 5.5us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= cmls_WiseBrotherMediaIncMember