Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.19.1
Fair Value Measurements - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Carrying value of notes $ 238,600,000  
Debt instrument, estimated fair value 218,300,000  
Impairment of intangible assets, indefinite-lived (excluding goodwill) 2,870,000 $ 19,000
Broadcast Market Clusters and Mastheads [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impairment of intangible assets, indefinite-lived (excluding goodwill) $ 2,900,000