Segment Information - Narrative (Details) - Local Media	Dec. 31, 2018 affiliate
ABC affiliates
Segment Reporting Information [Line Items]
Number of television affiliates	15
NBC affiliates
Segment Reporting Information [Line Items]
Number of television affiliates	5
FOX affiliates
Segment Reporting Information [Line Items]
Number of television affiliates	2
CBS affiliates
Segment Reporting Information [Line Items]
Number of television affiliates	2
My TV Affiliates
Segment Reporting Information [Line Items]
Number of television affiliates	2
CW affiliate
Segment Reporting Information [Line Items]
Number of television affiliates	1
Non big-four affiliated stations
Segment Reporting Information [Line Items]
Number of television affiliates	2
Azteca America Spanish-language affiliates
Segment Reporting Information [Line Items]
Number of television affiliates	4