Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 12,299	$ 15,137	$ 284	$ 5,868
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization			51,035	57,952
Amortization of debt issuance costs/discounts	2,400	2,300	4,712	4,654
Provision for doubtful accounts			2,417	1,828
Loss (gain) on sale of assets or stations			735	(898)
Impairment charges - equity interest in Pulser Media Inc.	1,056	0	1,056	0
Fair value adjustment of derivative instruments			0	21
Deferred income taxes			2,847	3,155
Stock-based compensation expense			7,743	8,245
(Earnings) loss from consolidated subsidiaries			0	0
Changes in assets and liabilities			(35,105)	(39,320)
Net cash provided by operating activities			35,724	41,505
Cash flows from investing activities:
Proceeds from sale of assets or stations			3,055	14,069
Restricted cash			1,634	(240)
Capital expenditures			(14,860)	(11,248)
Net cash (used in) provided by investing activities			(10,171)	2,581
Cash flows from financing activities:
Intercompany transactions, net			0	0
Repayment of borrowings under term loans and revolving credit facilities			0	(66,125)
Proceeds from borrowings under term loans and revolving credit facilities			0	10,000
Tax withholding payments on behalf of employees			(93)	(1,320)
Proceeds from exercise of warrants			3	103
Proceeds from exercise of options			0	602
Deferred financing costs			0	(21)
Net cash used in financing activities			(90)	(56,761)
Increase (decrease) in cash and cash equivalents			25,463	(12,675)
Cash and cash equivalents at beginning of period			7,271	32,792
Cash and cash equivalents at end of period	32,734	20,117	32,734	20,117
Cumulus Media Inc. (Parent Guarantor)
Cash flows from operating activities:
Net income	12,299	15,137	284	5,868
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization			0	0
Amortization of debt issuance costs/discounts			0	0
Provision for doubtful accounts			0	0
Loss (gain) on sale of assets or stations			0	0
Impairment charges - equity interest in Pulser Media Inc.	0		0
Fair value adjustment of derivative instruments				0
Deferred income taxes			(1,734)	(1,741)
Stock-based compensation expense			0	0
(Earnings) loss from consolidated subsidiaries			(2,917)	(9,108)
Changes in assets and liabilities			0	0
Net cash provided by operating activities			(4,367)	(4,981)
Cash flows from investing activities:
Proceeds from sale of assets or stations			0	0
Restricted cash			0	0
Capital expenditures			0	0
Net cash (used in) provided by investing activities			0	0
Cash flows from financing activities:
Intercompany transactions, net			4,364	(7,528)
Repayment of borrowings under term loans and revolving credit facilities				0
Proceeds from borrowings under term loans and revolving credit facilities				0
Tax withholding payments on behalf of employees			0	0
Proceeds from exercise of warrants			3	103
Proceeds from exercise of options				602
Deferred financing costs				0
Net cash used in financing activities			4,367	(6,823)
Increase (decrease) in cash and cash equivalents			0	(11,804)
Cash and cash equivalents at beginning of period			0	11,804
Cash and cash equivalents at end of period	0	0	0	0
Cumulus Media Holdings Inc. (Subsidiary Issuer)
Cash flows from operating activities:
Net income	13,616	16,744	2,917	9,108
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization			616	917
Amortization of debt issuance costs/discounts			4,617	4,558
Provision for doubtful accounts			0	0
Loss (gain) on sale of assets or stations			0	0
Impairment charges - equity interest in Pulser Media Inc.	0		0
Fair value adjustment of derivative instruments				21
Deferred income taxes			(50,894)	(37,314)
Stock-based compensation expense			7,743	8,245
(Earnings) loss from consolidated subsidiaries			(43,774)	(78,523)
Changes in assets and liabilities			152,329	168,519
Net cash provided by operating activities			73,554	75,531
Cash flows from investing activities:
Proceeds from sale of assets or stations			0	0
Restricted cash			1,634	(240)
Capital expenditures			(1,516)	(86)
Net cash (used in) provided by investing activities			118	(326)
Cash flows from financing activities:
Intercompany transactions, net			(48,113)	(43,775)
Repayment of borrowings under term loans and revolving credit facilities				(31,125)
Proceeds from borrowings under term loans and revolving credit facilities				0
Tax withholding payments on behalf of employees			(93)	(1,320)
Proceeds from exercise of warrants			0	0
Proceeds from exercise of options				0
Deferred financing costs				(21)
Net cash used in financing activities			(48,206)	(76,241)
Increase (decrease) in cash and cash equivalents			25,466	(1,036)
Cash and cash equivalents at beginning of period			7,268	20,988
Cash and cash equivalents at end of period	32,734	19,952	32,734	19,952
Subsidiary Guarantors
Cash flows from operating activities:
Net income	36,360	52,076	43,774	78,523
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization			50,419	57,035
Amortization of debt issuance costs/discounts			0	0
Provision for doubtful accounts			2,417	1,828
Loss (gain) on sale of assets or stations			735	(898)
Impairment charges - equity interest in Pulser Media Inc.	1,056		1,056
Fair value adjustment of derivative instruments				0
Deferred income taxes			39,865	42,669
Stock-based compensation expense			0	0
(Earnings) loss from consolidated subsidiaries			16,766	853
Changes in assets and liabilities			(188,495)	(199,055)
Net cash provided by operating activities			(33,463)	(19,045)
Cash flows from investing activities:
Proceeds from sale of assets or stations			3,055	14,069
Restricted cash			0	0
Capital expenditures			(13,344)	(11,162)
Net cash (used in) provided by investing activities			(10,289)	2,907
Cash flows from financing activities:
Intercompany transactions, net			43,749	16,303
Repayment of borrowings under term loans and revolving credit facilities				0
Proceeds from borrowings under term loans and revolving credit facilities				0
Tax withholding payments on behalf of employees			0	0
Proceeds from exercise of warrants			0	0
Proceeds from exercise of options				0
Deferred financing costs				0
Net cash used in financing activities			43,749	16,303
Increase (decrease) in cash and cash equivalents			(3)	165
Cash and cash equivalents at beginning of period			3	0
Cash and cash equivalents at end of period	0	165	0	165
Subsidiary Non-guarantors
Cash flows from operating activities:
Net income	(8,053)	(372)	(16,766)	(853)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization			0	0
Amortization of debt issuance costs/discounts			95	96
Provision for doubtful accounts			0	0
Loss (gain) on sale of assets or stations			0	0
Impairment charges - equity interest in Pulser Media Inc.	0		0
Fair value adjustment of derivative instruments				0
Deferred income taxes			15,610	(459)
Stock-based compensation expense			0	0
(Earnings) loss from consolidated subsidiaries			0	0
Changes in assets and liabilities			1,061	(8,784)
Net cash provided by operating activities			0	(10,000)
Cash flows from investing activities:
Proceeds from sale of assets or stations			0	0
Restricted cash			0	0
Capital expenditures			0	0
Net cash (used in) provided by investing activities			0	0
Cash flows from financing activities:
Intercompany transactions, net			0	35,000
Repayment of borrowings under term loans and revolving credit facilities				(35,000)
Proceeds from borrowings under term loans and revolving credit facilities				10,000
Tax withholding payments on behalf of employees			0	0
Proceeds from exercise of warrants			0	0
Proceeds from exercise of options				0
Deferred financing costs				0
Net cash used in financing activities			0	10,000
Increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	0	0	0	0
Eliminations
Cash flows from operating activities:
Net income	(41,923)	(68,448)	(29,925)	(86,778)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation and amortization			0	0
Amortization of debt issuance costs/discounts			0	0
Provision for doubtful accounts			0	0
Loss (gain) on sale of assets or stations			0	0
Impairment charges - equity interest in Pulser Media Inc.	0		0
Fair value adjustment of derivative instruments				0
Deferred income taxes			0	0
Stock-based compensation expense			0	0
(Earnings) loss from consolidated subsidiaries			29,925	86,778
Changes in assets and liabilities			0	0
Net cash provided by operating activities			0	0
Cash flows from investing activities:
Proceeds from sale of assets or stations			0	0
Restricted cash			0	0
Capital expenditures			0	0
Net cash (used in) provided by investing activities			0	0
Cash flows from financing activities:
Intercompany transactions, net			0	0
Repayment of borrowings under term loans and revolving credit facilities				0
Proceeds from borrowings under term loans and revolving credit facilities				0
Tax withholding payments on behalf of employees			0	0
Proceeds from exercise of warrants			0	0
Proceeds from exercise of options				0
Deferred financing costs				0
Net cash used in financing activities			0	0
Increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0	$ 0