Supplemental Condensed Consolidating Financial Information (Condensed Consolidating Statements of Cash Flows) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 11,769us-gaap_NetIncomeLoss	$ 176,083us-gaap_NetIncomeLoss	$ (32,729)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	115,275	116,951	143,303
Amortization of debt issuance costs/discounts	9,493	9,919	10,130
Provision for doubtful accounts	4,302us-gaap_ProvisionForDoubtfulAccounts	3,349us-gaap_ProvisionForDoubtfulAccounts	3,694us-gaap_ProvisionForDoubtfulAccounts
(Gain) loss on sale of assets or stations	(1,342)	(3,685)	2,277
Gain on exchange of assets or stations	0cmls_GainsOnExchangeOfAssetsOrStations	(108,158)cmls_GainsOnExchangeOfAssetsOrStations	(62,967)cmls_GainsOnExchangeOfAssetsOrStations
Impairment of intangible assets	0	0	127,141
Fair value adjustment of derivative instruments	21us-gaap_UnrealizedGainLossOnDerivatives	(1,829)us-gaap_UnrealizedGainLossOnDerivatives	320us-gaap_UnrealizedGainLossOnDerivatives
Deferred income taxes	6,902us-gaap_DeferredIncomeTaxExpenseBenefit	(76,378)us-gaap_DeferredIncomeTaxExpenseBenefit	(18,227)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense	17,638us-gaap_ShareBasedCompensation	10,804us-gaap_ShareBasedCompensation	11,893us-gaap_ShareBasedCompensation
Loss on early extinguishment of debt	0cmls_LossOnEarlyExtinguishmentOfDebt	34,934cmls_LossOnEarlyExtinguishmentOfDebt	2,432cmls_LossOnEarlyExtinguishmentOfDebt
Earnings from consolidated subsidiaries	0	0	0
Changes in assets and liabilities	(27,262)	(40,849)	(7,777)
Net cash provided by operating activities	136,796	121,141	179,490
Cash flows from investing activities:
Proceeds from sale of assets or stations	15,843	0	1,897
Restricted cash	(3,909)	(225)	(2,067)
Proceeds from exchange of assets or stations	0	241,519	114,918
Acquisitions less cash acquired	(8,500)	(322,838)	(9,998)
Capital expenditures	(19,006)	(11,081)	(6,607)
Net cash (used in) provided by investing activities	(15,572)	(92,625)	98,143
Cash flows from financing activities:
Intercompany transactions, net	0	0	0
Repayment of borrowings under term loans and revolving credit facilities	(156,125)us-gaap_RepaymentsOfLongTermDebt	(2,111,688)us-gaap_RepaymentsOfLongTermDebt	(174,313)us-gaap_RepaymentsOfLongTermDebt
Proceeds from borrowings under term loans and revolving credit facilities	10,000	2,027,308	21,000
Tax withholding payments on behalf of employees	(1,332)	(337)	(1,952)
Preferred stock dividends	0	(9,395)	(15,017)
Proceeds from exercise of warrants	113us-gaap_ProceedsFromIssuanceOfWarrants	93us-gaap_ProceedsFromIssuanceOfWarrants	142us-gaap_ProceedsFromIssuanceOfWarrants
Proceeds from exercise of options	620	818	0
Redemption of preferred stock	0	(150,391)	(49,233)
Proceeds from issuance of common stock	0cmls_ProceedsFromSaleOfEquitySecurities	94,300cmls_ProceedsFromSaleOfEquitySecurities	0cmls_ProceedsFromSaleOfEquitySecurities
Proceeds from issuance of preferred stock	0	77,241	0
Deferred financing costs	(21)us-gaap_PaymentsOfFinancingCosts	(7,182)us-gaap_PaymentsOfFinancingCosts	(802)us-gaap_PaymentsOfFinancingCosts
Financing costs paid in connection with issuance of common stock	0	(4,541)	0
Net cash used in financing activities	(146,745)	(83,774)	(220,175)
(Decrease) increase in cash and cash equivalents	(25,521)	(55,258)	57,458
Cash and cash equivalents at beginning of period	32,792	88,050	30,592
Cash and cash equivalents at end of period	7,271	32,792	88,050
Cumulus Media Inc. (Parent Guarantor)
Cash flows from operating activities:
Net income (loss)	11,769	176,083	(32,729)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	0	0	2,671
Amortization of debt issuance costs/discounts	0	0	0
Provision for doubtful accounts	0	0	0
(Gain) loss on sale of assets or stations	0	0	0
Gain on exchange of assets or stations		0	0
Impairment of intangible assets			0
Fair value adjustment of derivative instruments	0	0	332
Deferred income taxes	(3,739)	0	0
Stock-based compensation expense	0	0	11,893
Loss on early extinguishment of debt		0	0
Earnings from consolidated subsidiaries	(17,379)	(183,142)	(28,407)
Changes in assets and liabilities	0	0	(80,084)
Net cash provided by operating activities	(9,349)	(7,059)	(126,324)
Cash flows from investing activities:
Proceeds from sale of assets or stations	0		1,897
Restricted cash	0	0	(2,067)
Proceeds from exchange of assets or stations		0	0
Acquisitions less cash acquired	0	0	0
Capital expenditures	0	0	(722)
Net cash (used in) provided by investing activities	0	0	(892)
Cash flows from financing activities:
Intercompany transactions, net	(3,188)	(70,524)	263,963
Repayment of borrowings under term loans and revolving credit facilities	0	0	0
Proceeds from borrowings under term loans and revolving credit facilities	0	0	0
Tax withholding payments on behalf of employees	0	(337)	(1,952)
Preferred stock dividends		(9,395)	(15,017)
Proceeds from exercise of warrants	113	93	142
Proceeds from exercise of options	620	818
Redemption of preferred stock		(150,391)	(49,233)
Proceeds from issuance of common stock		94,300
Proceeds from issuance of preferred stock		77,241
Deferred financing costs	0	0	(802)
Financing costs paid in connection with issuance of common stock		(4,541)
Net cash used in financing activities	(2,455)	(62,736)	197,101
(Decrease) increase in cash and cash equivalents	(11,804)	(69,795)	69,885
Cash and cash equivalents at beginning of period	11,804	81,599	11,714
Cash and cash equivalents at end of period	0	11,804	81,599
Cumulus Media Holdings Inc. (Subsidiary Issuer)
Cash flows from operating activities:
Net income (loss)	17,379	183,142	28,407
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,619	1,913	0
Amortization of debt issuance costs/discounts	9,302	9,905	10,130
Provision for doubtful accounts	0	0	0
(Gain) loss on sale of assets or stations	0	0	0
Gain on exchange of assets or stations		0	0
Impairment of intangible assets			0
Fair value adjustment of derivative instruments	21	23	0
Deferred income taxes	(81,993)	0	0
Stock-based compensation expense	17,638	10,804	0
Loss on early extinguishment of debt		34,934	2,432
Earnings from consolidated subsidiaries	(148,874)	(339,604)	(226,875)
Changes in assets and liabilities	349,463	46,572	3,075
Net cash provided by operating activities	164,555	(52,311)	(182,831)
Cash flows from investing activities:
Proceeds from sale of assets or stations	0		0
Restricted cash	(3,909)	(225)	0
Proceeds from exchange of assets or stations		0	0
Acquisitions less cash acquired	0	0	0
Capital expenditures	(1,000)	(495)	0
Net cash (used in) provided by investing activities	(4,909)	(720)	0
Cash flows from financing activities:
Intercompany transactions, net	(50,909)	189,671	336,144
Repayment of borrowings under term loans and revolving credit facilities	(121,125)	(2,111,688)	(174,313)
Proceeds from borrowings under term loans and revolving credit facilities	0	2,002,308	21,000
Tax withholding payments on behalf of employees	(1,332)	0	0
Preferred stock dividends		0	0
Proceeds from exercise of warrants	0	0	0
Proceeds from exercise of options	0	0
Redemption of preferred stock		0	0
Proceeds from issuance of common stock		0
Proceeds from issuance of preferred stock		0
Deferred financing costs	0	(6,272)	0
Financing costs paid in connection with issuance of common stock		0
Net cash used in financing activities	(173,366)	74,019	182,831
(Decrease) increase in cash and cash equivalents	(13,720)	20,988	0
Cash and cash equivalents at beginning of period	20,988	0	0
Cash and cash equivalents at end of period	7,268	20,988	0
Subsidiary Guarantors
Cash flows from operating activities:
Net income (loss)	148,874	339,604	226,875
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	113,656	115,038	140,632
Amortization of debt issuance costs/discounts	0	0	0
Provision for doubtful accounts	4,302	3,349	3,694
(Gain) loss on sale of assets or stations	(1,342)	(3,685)	2,277
Gain on exchange of assets or stations		(108,158)	(37,990)
Impairment of intangible assets			127,141
Fair value adjustment of derivative instruments	0	(1,852)	(12)
Deferred income taxes	93,576	(77,551)	(28,681)
Stock-based compensation expense	0	0	0
Loss on early extinguishment of debt		0	0
Earnings from consolidated subsidiaries	1,414	1,394	(20,315)
Changes in assets and liabilities	(368,911)	(329,635)	87,256
Net cash provided by operating activities	(8,431)	(61,496)	500,877
Cash flows from investing activities:
Proceeds from sale of assets or stations	15,843		0
Restricted cash	0	0	0
Proceeds from exchange of assets or stations		241,519	114,918
Acquisitions less cash acquired	(8,500)	(322,838)	(9,998)
Capital expenditures	(18,006)	(10,586)	(5,885)
Net cash (used in) provided by investing activities	(10,663)	(91,905)	99,035
Cash flows from financing activities:
Intercompany transactions, net	19,097	146,950	(612,339)
Repayment of borrowings under term loans and revolving credit facilities	0	0	0
Proceeds from borrowings under term loans and revolving credit facilities	0	0	0
Tax withholding payments on behalf of employees	0	0	0
Preferred stock dividends		0	0
Proceeds from exercise of warrants	0	0	0
Proceeds from exercise of options	0	0
Redemption of preferred stock		0
Proceeds from issuance of common stock		0
Proceeds from issuance of preferred stock		0
Deferred financing costs	0	0	0
Financing costs paid in connection with issuance of common stock		0
Net cash used in financing activities	19,097	146,950	(612,339)
(Decrease) increase in cash and cash equivalents	3	(6,451)	(12,427)
Cash and cash equivalents at beginning of period	0	6,451	18,878
Cash and cash equivalents at end of period	3	0	6,451
Subsidiary Non- guarantors
Cash flows from operating activities:
Net income (loss)	(1,414)	(1,394)	20,315
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	0	0	0
Amortization of debt issuance costs/discounts	191	14	0
Provision for doubtful accounts	0	0	0
(Gain) loss on sale of assets or stations	0	0	0
Gain on exchange of assets or stations		0	(24,977)
Impairment of intangible assets			0
Fair value adjustment of derivative instruments	0	0	0
Deferred income taxes	(942)	1,173	10,454
Stock-based compensation expense	0	0	0
Loss on early extinguishment of debt		0	0
Earnings from consolidated subsidiaries	0	0	0
Changes in assets and liabilities	(7,814)	242,214	(18,024)
Net cash provided by operating activities	(9,979)	242,007	(12,232)
Cash flows from investing activities:
Proceeds from sale of assets or stations	0		0
Restricted cash	0	0	0
Proceeds from exchange of assets or stations		0	0
Acquisitions less cash acquired	0	0	0
Capital expenditures	0	0	0
Net cash (used in) provided by investing activities	0	0	0
Cash flows from financing activities:
Intercompany transactions, net	35,000	(266,097)	12,232
Repayment of borrowings under term loans and revolving credit facilities	(35,000)	0	0
Proceeds from borrowings under term loans and revolving credit facilities	10,000	25,000	0
Tax withholding payments on behalf of employees	0	0	0
Preferred stock dividends		0	0
Proceeds from exercise of warrants	0	0	0
Proceeds from exercise of options	0	0
Redemption of preferred stock		0
Proceeds from issuance of common stock		0
Proceeds from issuance of preferred stock		0
Deferred financing costs	(21)	(910)	0
Financing costs paid in connection with issuance of common stock		0
Net cash used in financing activities	9,979	(242,007)	12,232
(Decrease) increase in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	0	0	0
Eliminations
Cash flows from operating activities:
Net income (loss)	(164,839)	(521,352)	(275,597)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	0	0	0
Amortization of debt issuance costs/discounts	0	0	0
Provision for doubtful accounts	0	0	0
(Gain) loss on sale of assets or stations	0	0	0
Gain on exchange of assets or stations		0	0
Impairment of intangible assets			0
Fair value adjustment of derivative instruments	0	0	0
Deferred income taxes	0	0	0
Stock-based compensation expense	0	0	0
Loss on early extinguishment of debt		0	0
Earnings from consolidated subsidiaries	164,839	521,352	275,597
Changes in assets and liabilities	0	0	0
Net cash provided by operating activities	0	0	0
Cash flows from investing activities:
Proceeds from sale of assets or stations	0		0
Restricted cash	0	0	0
Proceeds from exchange of assets or stations		0	0
Acquisitions less cash acquired	0	0	0
Capital expenditures	0	0	0
Net cash (used in) provided by investing activities	0	0	0
Cash flows from financing activities:
Intercompany transactions, net	0	0	0
Repayment of borrowings under term loans and revolving credit facilities	0	0	0
Proceeds from borrowings under term loans and revolving credit facilities	0	0	0
Tax withholding payments on behalf of employees	0	0	0
Preferred stock dividends		0	0
Proceeds from exercise of warrants	0	0	0
Proceeds from exercise of options	0	0
Redemption of preferred stock		0
Proceeds from issuance of common stock		0
Proceeds from issuance of preferred stock		0
Deferred financing costs	0	0	0
Financing costs paid in connection with issuance of common stock		0
Net cash used in financing activities	0	0	0
(Decrease) increase in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of period	0	0	0
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0

Depreciation and amortization including discontinued operations.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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