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Asset Exchange - Summary of Discontinued Operations (Detail)	12 Months Ended
	Dec. 31, 2014 USD ($)
Discontinued Operations and Disposal Groups [Abstract]
Net revenue	$ 42,621,758
Station operating expenses	27,732,682
Employee termination expenses	62,500
Depreciation and amortization	374,002
Gain on exchange of radio stations	(54,306,974)
Other (income) expense, net	330,416
Income from discontinued operations before income taxes	68,429,132
Income tax expense	29,395,750
Income from discontinued operations	$ 39,033,382

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