Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended				3 Months Ended		6 Months Ended
	Aug. 23, 2012 KXOS-FM (Radio)	Aug. 31, 2012 KXOS-FM (Radio) Collaborative Arrangement [Member]	Aug. 31, 2012 KXOS-FM (Radio) Collaborative Arrangement [Member]	Oct. 31, 2012 Emmis Interactive Inc. (Radio)	Oct. 01, 2012 Sampler Publications	Feb. 25, 2013 Slovakia Radio Network (Radio)	Jan. 03, 2013 Bulgaria Radio Network (Radio)	Aug. 31, 2013 98.7 FM [Member] Collaborative Arrangement [Member]	Aug. 31, 2012 98.7 FM [Member] Collaborative Arrangement [Member]	Aug. 31, 2013 98.7 FM [Member] Collaborative Arrangement [Member]	Aug. 31, 2012 98.7 FM [Member] Collaborative Arrangement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Selling cash price of land, towers and other equipment	$ 85.5				$ 8.7	$ 21.2	$ 1.7
Gain (loss) on sale of business	32.8			(0.7)	0.7	14.8	(1.3)
Transaction expenses and tax obligations					0.2
Repayment of term loans under credit agreement					8.5
Annual license fees received		$ 1.6	$ 3.3					$ 2.6	$ 2.6	$ 5.2	$ 3.4