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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |
Renewable terms of FCC broadcasting licenses | 8 years |  |
Weighted-average period before the next renewal of the Company's FCC broadcasting licenses | 2 years |  |
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Operating Lease, Liability |  |  | $ 43.1
Operating Lease, Right-of-Use Asset |  |  | 38.8
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Retained Earnings |  |  | $ 0.9
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Boston, MA, Philadelphia, PA and Tampa-Saint Petersburg, FL [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Radio stations contributed to net revenue | 58.80% | 52.50% |

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