Components of Change in Fair Value (Detail) (USD $) In Thousands, unless otherwise specified				6 Months Ended
	Jun. 30, 2014 Contingent Consideration	Jun. 30, 2014 Fair Value, Measurements, Recurring	Dec. 31, 2013 Fair Value, Measurements, Recurring	Jun. 30, 2014 Fair Value, Measurements, Recurring Contingent Consideration		Jun. 30, 2014 Equity interest in Pulser Media Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value balance at January 1, 2014		$ 5,513	$ 144			$ 122	[1]
Add: Additions to equity interest in Pulser						5,390
Fair value balance at June 30, 2014		5,513	144			5,512	[1]
Fair value balance at January 1, 2014	(31)	(31)	(31)	(31)	[2]
Add: Mark to market fair value adjustment				0
Fair value balance at June 30, 2014	$ (31)	$ (31)	$ (31)	$ (31)	[2]

[1] On September 13, 2013, the Company and Pulser Media (the parent company of Rdio) ("Pulser"), entered into a five year strategic promotional partnership and sales arrangement (the "Rdio Agreement"). In exchange for $75 million of promotional commitments over five years, Cumulus will receive 15% of the current fully-diluted equity of Pulser, with the opportunity to earn additional equity, see Note 13 "Commitments and Contingencies". The fair value of the equity interest in Pulser was determined using inputs that are supported by little or no market activity (a Level 3 measurement). At June 30, 2014 the fair value of the equity interest in Pulser approximated its cost basis and the Company determined that the investment was not impaired.

[2] The fair value of the contingent consideration was determined using inputs that are supported by little or no market activity (a Level 3 measurement). Contingent consideration represents the fair value of the additional cash consideration potentially payable as part of the WFME Asset Exchange. See Note 2 “Acquisitions and Dispositions”.