Description of Business, Interim Financial Data and Basis of Presentation: (Policies)	6 Months Ended
	Jun. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Cumulus Media Inc. (and its consolidated subsidiaries, except as the context may otherwise require, “Cumulus,” “Cumulus Media,” “we,” “us,” “our,” or the “Company”) is a Delaware corporation, organized in 2002, and successor by merger to an Illinois corporation with the same name that had been organized in 1997.
Interim Financial Data	Interim Financial Data The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements of the Company and the notes related thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014. The accompanying unaudited condensed consolidated financial statements include the condensed consolidated accounts of Cumulus and its wholly-owned subsidiaries, with all intercompany balances and transactions eliminated in consolidation. The December 31, 2014 condensed balance sheet data was derived from audited financial statements. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting only of normal, recurring adjustments) necessary for a fair presentation of our results of operations for, and financial condition as of the end of, the interim periods have been made. The results of operations for the three and six months ended June 30, 2015, the cash flows for the six months ended June 30, 2015 and the Company’s financial condition as of June 30, 2015, are not necessarily indicative of the results of operations or cash flows that can be expected for, or the Company’s financial condition that can be expected as of the end of, any other interim period or for the fiscal year ending December 31, 2015.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures of contingent assets and liabilities. On an on-going basis, the Company evaluates its estimates, including significant estimates related to bad debts, intangible assets, income taxes, stock-based compensation, contingencies, litigation, and, if applicable, purchase price allocation. The Company bases its estimates on historical experience and on various assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual amounts and results may differ materially from these estimates.
Assets Held for Sale	Assets Held for Sale During the six months ended June 30, 2015, the Company entered into an agreement to sell certain land to a third party. The closing of the transaction is subject to various closing conditions, including a due diligence period. The land has been classified as held for sale in the unaudited condensed consolidated balance sheet at June 30, 2015. During the year ended December 31, 2014, the Company entered into an agreement to sell certain land and buildings to a third party of which the Company expects to close in the next twelve months. The identified assets have been classified as held for sale in the unaudited condensed consolidated balance sheets at June 30, 2015 and December 31, 2014. The estimated fair value of the land and buildings for both sales are in excess of the carrying value.
Adoption of New Accounting Standards and Recent Accounting Standards Updates	Adoption of New Accounting Standards ASU 2014-08. In April 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2014-08. Under this ASU, only disposals that represent a strategic shift that has (or will have) a major effect on the entity’s results and operations would qualify as discontinued operations. This ASU (1) expands the disclosure requirements for disposals that meet the definition of a discontinued operation, (2) requires entities to disclose information about disposals of individually significant components, (3) defines “discontinued operations” similarly to how it is defined under International Financial Reporting Standards 5, and (4) requires entities to expand their disclosures about discontinued operations to include more information about assets, liabilities, income and expenses. In addition, this ASU also requires entities to disclose the pre-tax income attributable to a disposal of “an individually significant component of an entity that does not qualify for discontinued operations presentation in the financial statements.” The Company adopted this guidance effective January 1, 2015. The adoption of this guidance did not have an impact on the consolidated financial statements. Recent Accounting Standards Updates ASU 2014-09. In May 2014, the FASB issued ASU 2014-09. The amended guidance under this ASU outlines a single comprehensive revenue model for entities to use in accounting for revenue arising from contracts with customers. The guidance supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the single comprehensive revenue model is that “an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.” Entities have the option of using either a full retrospective or modified approach to adopt the guidance. This ASU was originally intended to be effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2016. In July 2015, the FASB voted to approve a one-year deferral of the effective date of this ASU. Transition to the new guidance may be done using either a full or modified retrospective method. The Company is currently assessing the expected impact that this ASU will have on the consolidated financial statements. ASU 2014-15. In August 2014, the FASB issued ASU 2014-15. The amendments in this update provide guidance in GAAP about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related footnote disclosures. Management’s evaluation should be based on relevant conditions and events that are known and reasonably knowable at the date that the financial statements are issued. In doing so, the amendments should reduce diversity in the timing and content of footnote disclosures. The amendments in this ASU are effective for public and nonpublic entities for annual periods ending after December 15, 2016, and interim periods thereafter. Early adoption is permitted. The adoption of this guidance is not expected to have an impact on the consolidated financial statements. ASU 2015-01. In January 2015, the FASB issued ASU 2015-01. The amendments in this ASU eliminate the concept of an extraordinary item from GAAP. As a result, an entity will no longer be required to segregate extraordinary items from the results of ordinary operations, to separately present an extraordinary item on its income statement, net of tax, after income from continuing operations or to disclose income taxes and earnings-per-share data applicable to an extraordinary item. However, the ASU will still retain the presentation and disclosure guidance for items that are unusual in nature and occur infrequently. The ASU will be effective for fiscal years beginning after December 15, 2015 and subsequent interim periods. Early adoption is permitted. The adoption of this guidance is not expected to have an impact on the consolidated financial statements. ASU 2015-02. In February 2015, the FASB issued ASU 2015-02. The amendments in this ASU provide modifications to the evaluation of variable interest entities that may impact consolidation of reporting entities. The ASU will be effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2015. Early adoption is permitted. The Company is currently assessing the expected impact, if any, that this ASU will have on the consolidated financial statements. ASU 2015-03. In April 2015, the FASB issued ASU 2015-03. The amendments in this ASU requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of long-term debt, consistent with debt discounts or premiums. Presently, debt issuance costs are reported as an asset. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. The ASU will be effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. Early adoption is permitted. The new guidance would be applied retrospectively to all prior reporting periods presented. The Company is currently assessing the expected impact, if any, that this ASU will have on the consolidated financial statements. ASU 2015-05. In April 2015, the FASB issued ASU 2015-05. The amendments in this ASU provide guidance about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, the entity should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the entity should account for the arrangement as a service contract. The new guidance does not change an entity’s accounting for service contracts. This ASU will be effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2015. Early adoption is permitted. The Company is currently assessing the expected impact, if any, that this ASU will have on the consolidated financial statements. ASU 2015-10. In June 2015, the FASB issued ASU 2015-10. The amendments in this ASU are intended to clarify the FASB Accounting Standards Codification (the "ASC"); correct unintended application of guidance; eliminate inconsistencies; and to improve the ASC’s presentation of guidance. This ASU will be effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have an impact on the consolidated financial statements.
Fair Value Measurement	The three levels of the fair value hierarchy to be applied to financial instruments when determining fair value are described below: Level 1 — Valuations based on quoted prices in active markets for identical assets or liabilities that the entity has the ability to access; Level 2 — Valuations based on quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable data for substantially the full term of the assets or liabilities; and Level 3 — Valuations based on inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. The Company’s financial assets and liabilities are measured at fair value on a recurring basis and non-financial assets and liabilities are measured at fair value on a non-recurring basis.