Description of Business, Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands |
3 Months Ended |
12 Months Ended |
|
Dec. 31, 2015
USD ($)
Station
|
Sep. 30, 2015
USD ($)
|
Jun. 30, 2015
USD ($)
|
Mar. 31, 2015
USD ($)
|
Dec. 31, 2014
USD ($)
Station
|
Sep. 30, 2014
USD ($)
|
Jun. 30, 2014
USD ($)
|
Mar. 31, 2014
USD ($)
|
Dec. 31, 2015
USD ($)
Segment
Station
|
Dec. 31, 2014
USD ($)
Station
|
Dec. 31, 2013
USD ($)
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Number of reportable business segments | Segment |
|
|
|
|
|
|
|
|
1
|
|
|
| Number of reporting units | Segment |
|
|
|
|
|
|
|
|
3
|
|
|
| Impairment charges related to decline in fair value of cost method investment |
|
|
|
|
|
|
|
|
$ 19,364
|
$ 0
|
$ 0
|
| Sales price of cost method investment |
|
|
|
|
|
|
|
|
|
13,000
|
|
| Aggregate carrying amount of cost method investment |
$ 0
|
|
|
|
$ 17,300
|
|
|
|
$ 0
|
17,300
|
|
| Advertising agency fees as a percentage of revenue |
|
|
|
|
|
|
|
|
15.00%
|
|
|
| Advertising expense |
|
|
|
|
|
|
|
|
$ 3,900
|
1,900
|
900
|
| Net revenue |
$ 308,825
|
$ 289,441
|
$ 299,334
|
$ 271,079
|
$ 329,247
|
$ 313,885
|
$ 328,247
|
$ 292,044
|
1,168,679
|
1,263,423
|
1,026,138
|
| Stock-based compensation expense |
|
|
|
|
|
|
|
|
21,033
|
17,638
|
10,804
|
| Trade revenue |
|
|
|
|
|
|
|
|
39,237
|
34,876
|
31,147
|
| Trade expenses |
|
|
|
|
|
|
|
|
$ 40,427
|
$ 36,753
|
31,218
|
| Local Marketing Agreements |
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Number of radio stations owned or operated by Cumulus Media | Station |
11
|
|
|
|
6
|
|
|
|
11
|
6
|
|
| Net revenue |
|
|
|
|
|
|
|
|
$ 24,500
|
$ 22,600
|
$ 2,200
|
| Other Income (Expense) |
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Gain recognized on sale of cost method investment |
|
|
|
|
|
|
|
|
|
$ 3,200
|
|
| Hurricane Katrina in 2005 |
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Insurance proceeds received |
|
|
|
|
|
|
|
|
14,600
|
|
|
| Hurricane Katrina in 2005 | Other Income |
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Insurance proceeds received |
|
|
|
|
|
|
|
|
12,400
|
|
|
| Hurricane Katrina in 2005 | Corporate Expenses |
|
|
|
|
|
|
|
|
|
|
|
| Accounting Policies [Line Items] |
|
|
|
|
|
|
|
|
|
|
|
| Insurance proceeds received |
|
|
|
|
|
|
|
|
$ 2,200
|
|
|