Supplemental Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheets) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current assets:        
Cash and cash equivalents $ 31,657 $ 7,271 $ 32,792 $ 88,050
Restricted cash 7,981 10,055    
Accounts receivable, less allowance for doubtful accounts of $4,923 and $6,004 in 2015 and 2014, respectively 243,428 248,308    
Trade receivable 4,146 2,455    
Assets held for sale 45,157 15,007    
Prepaid expenses and other current assets 26,906 87,730    
Total current assets 359,275 370,826    
Property and equipment, net 169,437 221,497    
Broadcast licenses 1,578,066 1,596,715    
Other intangible assets, net 174,530 243,640 315,490  
Goodwill 703,354 1,253,823 1,256,741  
Investment in consolidated subsidiaries 0 0    
Intercompany receivables 0 0    
Other assets 40,125 58,940    
Total assets 3,024,787 3,745,441    
Current liabilities:        
Accounts payable and accrued expenses 118,396 151,658    
Trade payable 4,374 3,964    
Total current liabilities 122,770 155,622    
Long-term debt, excluding 7.75% senior notes and secured loan 1,815,300 1,875,127    
7.75% senior notes 610,000 610,000    
Other liabilities 44,804 55,121    
Intercompany payables 0 0    
Deferred income taxes 415,881 507,991    
Total liabilities 3,008,755 3,203,861    
Stockholders' equity (deficit):        
Treasury stock, at cost, 22,445,945 and 22,619,554 shares at 2015 and 2014, respectively (229,310) (231,588)    
Additional paid-in-capital 1,619,622 1,600,963    
Accumulated (deficit) equity (1,376,844) (830,350)    
Total stockholders’ equity 16,032 541,580 512,740 246,633
Total liabilities and stockholders’ equity 3,024,787 3,745,441    
Class A Common Stock        
Stockholders' equity (deficit):        
Common stock 2,558 2,549    
Class C Common Stock        
Stockholders' equity (deficit):        
Common stock 6 6    
Eliminations        
Current assets:        
Cash and cash equivalents 0 0 0 0
Restricted cash 0 0    
Accounts receivable, less allowance for doubtful accounts of $4,923 and $6,004 in 2015 and 2014, respectively 0 0    
Trade receivable 0 0    
Assets held for sale 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets 0 0    
Property and equipment, net 0 0    
Broadcast licenses 0 0    
Other intangible assets, net 0 0    
Goodwill 0 0    
Investment in consolidated subsidiaries (4,973,650) (5,878,914)    
Intercompany receivables (1,745,901) (1,549,303)    
Other assets (106,035) 0    
Total assets (6,825,586) (7,428,217)    
Current liabilities:        
Accounts payable and accrued expenses 0 0    
Trade payable 0 0    
Total current liabilities 0 0    
Long-term debt, excluding 7.75% senior notes and secured loan 0 0    
7.75% senior notes 0 0    
Other liabilities 0 0    
Intercompany payables (1,745,901) (1,549,303)    
Deferred income taxes (106,035) 0    
Total liabilities (1,851,936) (1,549,303)    
Stockholders' equity (deficit):        
Treasury stock, at cost, 22,445,945 and 22,619,554 shares at 2015 and 2014, respectively 0 0    
Additional paid-in-capital (6,542,818) (6,480,603)    
Accumulated (deficit) equity 1,569,168 601,689    
Total stockholders’ equity (4,973,650) (5,878,914)    
Total liabilities and stockholders’ equity (6,825,586) (7,428,217)    
Eliminations | Class A Common Stock        
Stockholders' equity (deficit):        
Common stock 0 0    
Eliminations | Class C Common Stock        
Stockholders' equity (deficit):        
Common stock 0 0    
Cumulus Media Inc. (Parent Guarantor)        
Current assets:        
Cash and cash equivalents 0 0 11,804 81,599
Restricted cash 0 0    
Accounts receivable, less allowance for doubtful accounts of $4,923 and $6,004 in 2015 and 2014, respectively 0 0    
Trade receivable 0 0    
Assets held for sale 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets 0 0    
Property and equipment, net 0 0    
Broadcast licenses 0 0    
Other intangible assets, net 0 0    
Goodwill 0 0    
Investment in consolidated subsidiaries 110,550 627,363    
Intercompany receivables 0 0    
Other assets 0 0    
Total assets 110,550 627,363    
Current liabilities:        
Accounts payable and accrued expenses 0 0    
Trade payable 0 0    
Total current liabilities 0 0    
Long-term debt, excluding 7.75% senior notes and secured loan 0 0    
7.75% senior notes 0 0    
Other liabilities 0 0    
Intercompany payables 94,518 85,783    
Deferred income taxes 0 0    
Total liabilities 94,518 85,783    
Stockholders' equity (deficit):        
Treasury stock, at cost, 22,445,945 and 22,619,554 shares at 2015 and 2014, respectively (229,310) (231,588)    
Additional paid-in-capital 1,619,622 1,600,963    
Accumulated (deficit) equity (1,376,844) (830,350)    
Total stockholders’ equity 16,032 541,580    
Total liabilities and stockholders’ equity 110,550 627,363    
Cumulus Media Inc. (Parent Guarantor) | Class A Common Stock        
Stockholders' equity (deficit):        
Common stock 2,558 2,549    
Cumulus Media Inc. (Parent Guarantor) | Class C Common Stock        
Stockholders' equity (deficit):        
Common stock 6 6    
Cumulus Media Holdings Inc. (Subsidiary Issuer)        
Current assets:        
Cash and cash equivalents 31,657 7,268 20,988 0
Restricted cash 7,981 10,055    
Accounts receivable, less allowance for doubtful accounts of $4,923 and $6,004 in 2015 and 2014, respectively 0 0    
Trade receivable 0 0    
Assets held for sale 0 0    
Prepaid expenses and other current assets 6,375 66,020    
Total current assets 46,013 83,343    
Property and equipment, net 3,685 2,653    
Broadcast licenses 0 0    
Other intangible assets, net 0 0    
Goodwill 0 0    
Investment in consolidated subsidiaries 3,806,950 4,154,147    
Intercompany receivables 95,072 86,527    
Other assets 27,491 32,776    
Total assets 3,979,211 4,359,446    
Current liabilities:        
Accounts payable and accrued expenses 31,997 30,322    
Trade payable 0 0    
Total current liabilities 31,997 30,322    
Long-term debt, excluding 7.75% senior notes and secured loan 1,815,300 1,875,127    
7.75% senior notes 610,000 610,000    
Other liabilities 3,963 2,166    
Intercompany payables 1,407,401 1,214,468    
Deferred income taxes 0 0    
Total liabilities 3,868,661 3,732,083    
Stockholders' equity (deficit):        
Treasury stock, at cost, 22,445,945 and 22,619,554 shares at 2015 and 2014, respectively 0 0    
Additional paid-in-capital 268,673 244,233    
Accumulated (deficit) equity (158,123) 383,130    
Total stockholders’ equity 110,550 627,363    
Total liabilities and stockholders’ equity 3,979,211 4,359,446    
Cumulus Media Holdings Inc. (Subsidiary Issuer) | Class A Common Stock        
Stockholders' equity (deficit):        
Common stock 0 0    
Cumulus Media Holdings Inc. (Subsidiary Issuer) | Class C Common Stock        
Stockholders' equity (deficit):        
Common stock 0 0    
Subsidiary Guarantors        
Current assets:        
Cash and cash equivalents 0 3 0 6,451
Restricted cash 0 0    
Accounts receivable, less allowance for doubtful accounts of $4,923 and $6,004 in 2015 and 2014, respectively 0 0    
Trade receivable 4,146 2,455    
Assets held for sale 45,157 15,007    
Prepaid expenses and other current assets 20,531 21,710    
Total current assets 69,834 39,175    
Property and equipment, net 165,752 218,844    
Broadcast licenses 0 0    
Other intangible assets, net 174,530 243,640    
Goodwill 703,354 1,253,823    
Investment in consolidated subsidiaries 1,056,150 1,097,404    
Intercompany receivables 1,650,829 1,462,776    
Other assets 118,115 25,420    
Total assets 3,938,564 4,341,082    
Current liabilities:        
Accounts payable and accrued expenses 86,399 121,336    
Trade payable 4,374 3,964    
Total current liabilities 90,773 125,300    
Long-term debt, excluding 7.75% senior notes and secured loan 0 0    
7.75% senior notes 0 0    
Other liabilities 40,841 52,955    
Intercompany payables 0 0    
Deferred income taxes 0 8,680    
Total liabilities 131,614 186,935    
Stockholders' equity (deficit):        
Treasury stock, at cost, 22,445,945 and 22,619,554 shares at 2015 and 2014, respectively 0 0    
Additional paid-in-capital 4,241,459 4,163,779    
Accumulated (deficit) equity (434,509) (9,632)    
Total stockholders’ equity 3,806,950 4,154,147    
Total liabilities and stockholders’ equity 3,938,564 4,341,082    
Subsidiary Guarantors | Class A Common Stock        
Stockholders' equity (deficit):        
Common stock 0 0    
Subsidiary Guarantors | Class C Common Stock        
Stockholders' equity (deficit):        
Common stock 0 0    
Subsidiary Non-guarantors        
Current assets:        
Cash and cash equivalents 0 0 $ 0 $ 0
Restricted cash 0 0    
Accounts receivable, less allowance for doubtful accounts of $4,923 and $6,004 in 2015 and 2014, respectively 243,428 248,308    
Trade receivable 0 0    
Assets held for sale 0 0    
Prepaid expenses and other current assets 0 0    
Total current assets 243,428 248,308    
Property and equipment, net 0 0    
Broadcast licenses 1,578,066 1,596,715    
Other intangible assets, net 0 0    
Goodwill 0 0    
Investment in consolidated subsidiaries 0 0    
Intercompany receivables 0 0    
Other assets 554 744    
Total assets 1,822,048 1,845,767    
Current liabilities:        
Accounts payable and accrued expenses 0 0    
Trade payable 0 0    
Total current liabilities 0 0    
Long-term debt, excluding 7.75% senior notes and secured loan 0 0    
7.75% senior notes 0 0    
Other liabilities 0 0    
Intercompany payables 243,982 249,052    
Deferred income taxes 521,916 499,311    
Total liabilities 765,898 748,363    
Stockholders' equity (deficit):        
Treasury stock, at cost, 22,445,945 and 22,619,554 shares at 2015 and 2014, respectively 0 0    
Additional paid-in-capital 2,032,686 2,072,591    
Accumulated (deficit) equity (976,536) (975,187)    
Total stockholders’ equity 1,056,150 1,097,404    
Total liabilities and stockholders’ equity 1,822,048 1,845,767    
Subsidiary Non-guarantors | Class A Common Stock        
Stockholders' equity (deficit):        
Common stock 0 0    
Subsidiary Non-guarantors | Class C Common Stock        
Stockholders' equity (deficit):        
Common stock $ 0 $ 0