Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended
	Jan. 03, 2013 Bulgaria Radio Network (Radio)	May 31, 2013 98.7 FM [Member] Collaborative Arrangement [Member]	May 31, 2012 98.7 FM [Member] Collaborative Arrangement [Member]	Aug. 23, 2012 KXOS-FM (Radio)	May 31, 2012 KXOS-FM (Radio) Collaborative Arrangement [Member]	Oct. 31, 2012 Emmis Interactive Inc. (Radio)	Oct. 31, 2012 Sampler Publications	Feb. 25, 2013 Slovakia Radio Network (Radio)
Summary Of Significant Accounting Policies [Line Items]
Selling cash price of land, towers and other equipment	$ 1.7			$ 85.5			$ 8.7	$ 21.2
Gain (loss) on sale of business	(1.3)			32.8		(0.7)	0.7	14.8
Transaction expenses and tax obligations							0.2
Repayment of term loans under credit agreement							8.5
Annual license fees received		$ 2.6	$ 0.9		$ 1.8