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Asset Exchange - Summary of Pro forma Information (Detail) - CBS Radio [Member]
12 Months Ended
Dec. 31, 2014
USD ($)
$ / shares
Business Acquisition [Line Items]  
Net revenue $ 112,173,985
Operating income 19,589,159
Net income $ 9,501,522
Basic net income per share | $ / shares $ 0.42
Diluted net income per share | $ / shares $ 0.41