Financial Assets and Liabilities and Non-Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets:	$ 17,774		$ 17,339
Financial liabilities:	(181)		(181)
Equity interest in Pulser Media
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets:	17,774	[1]	17,339	[1]
Contingent Consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities:	(181)	[2]	(181)	[2]
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets:	17,774		17,339
Financial liabilities:	(181)		(181)
Significant Unobservable Inputs (Level 3) | Equity interest in Pulser Media
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets:	17,774	[1]	17,339	[1]
Significant Unobservable Inputs (Level 3) | Contingent Consideration
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial liabilities:	$ (181)	[2]	$ (181)	[2]

[1] On September 13, 2013, the Company and Pulser Media Inc. (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 a 15% equity interest in Pulser, with the opportunity to earn additional equity, see Note 11, "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 March 31, 2015 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 Wise Brothers Acquisition and the Company's 2013 asset exchange with Family Stations, Inc. (the "WFME Asset Exchange").