Goodwill and Other Intangible Assets - Additional Information (Detail)		12 Months Ended
	Jun. 30, 2014 Segment	Dec. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Goodwill [Line Items]
Aggregate amortization expense		$ 3,500,000	$ 3,500,000	$ 3,000,000
Number of reporting segments | Segment	2	3
Television
Goodwill [Line Items]
Impairment of goodwill		$ 0	0	0
Digital
Goodwill [Line Items]
Impairment of goodwill		$ 0	$ 0
Radio
Goodwill [Line Items]
Impairment of goodwill				$ 700,000