Nature of Business - Additional Information (Detail)		12 Months Ended
	Jun. 30, 2014 Segment	Dec. 31, 2016 Segment Station Location
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	2	3
Television
Segment Reporting Information [Line Items]
Number of stations owned		54
Radio
Segment Reporting Information [Line Items]
Number of stations owned		49
Radio operations stations, number of location | Location		18
Advertisements and Syndicate Radio Programming
Segment Reporting Information [Line Items]
Number of stations owned		350