Acquisitions - Narrative (Details) | Sep. 19, 2019USD ($)television_station | Jul. 26, 2019USD ($) | Jun. 10, 2019USD ($) | May 01, 2019USD ($)television_station | Jan. 01, 2019USD ($)television_station | Nov. 30, 2018USD ($) | Oct. 02, 2017USD ($) | Dec. 31, 2018USD ($) | Dec. 31, 2019USD ($) | Dec. 31, 2018USD ($) | Dec. 31, 2017USD ($) | Dec. 31, 2016USD ($) |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Goodwill | | | | | | | | $ 786,837,000 | $ 1,224,679,000 | $ 786,837,000 | $ 708,773,000 | $ 528,604,000 |
Television network affiliation relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | | | 20 years | | | |
Customer lists and advertiser relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | | | 20 years | | | |
Nexstar Media Group, Inc. | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Number of television stations acquired | television_station | 8 | | | | | | | | | | | |
Business acquisition, purchase price | $ 582,000,000 | | | | | | | | | | | |
Revenues from acquired operations | | | | | | | | | $ 79,800,000 | | | |
Goodwill | 164,457,000 | | | | | | | | | | | |
Nexstar Media Group, Inc. | Television network affiliation relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | 181,000,000 | | | | | | | | | | | |
Nexstar Media Group, Inc. | Customer lists and advertiser relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | $ 7,100,000 | | | | | | | | | | | |
Cordillera Communications, LLC | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Number of television stations acquired | television_station | | | | 15 | | | | | | | | |
Business acquisition, purchase price | | | | $ 521,000,000 | | | | | | | | |
Revenues from acquired operations | | | | | | | | | 105,200,000 | | | |
Working capital adjustment | | | | 23,900,000 | | | | | | | | |
Goodwill | | | | 252,920,000 | | | | | | | | |
Cordillera Communications, LLC | Television network affiliation relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | | | | 169,400,000 | | | | | | | | |
Cordillera Communications, LLC | Customer lists and advertiser relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | | | | $ 5,900,000 | | | | | | | | |
Cordillera Communications, LLC | Shared service agreement | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | 20 years | | | | | | | | |
Intangible assets acquired | | | | $ 13,000,000 | | | | | | | | |
Raycom Media, Inc. | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Number of television stations acquired | television_station | | | | | 3 | | | | | | | |
Business acquisition, purchase price | | | | | $ 55,000,000 | | | | | | | |
Revenues from acquired operations | | | | | | | | | 23,400,000 | | | |
Goodwill | | | | | 18,349,000 | | | | | | | |
Raycom Media, Inc. | Television network affiliation relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | | | | | 17,400,000 | | | | | | | |
Raycom Media, Inc. | Customer lists and advertiser relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | | | | | $ 700,000 | | | | | | | |
Raycom Media, Inc., Cordillera Communications, LLC And Nexstar Media Group, Inc. | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Goodwill | | | | | | | | | $ 435,726,000 | | | |
Raycom Media, Inc., Cordillera Communications, LLC And Nexstar Media Group, Inc. | Television network affiliation relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | | | 20 years | | | |
Intangible assets acquired | | | | | | | | | $ 367,800,000 | | | |
Raycom Media, Inc., Cordillera Communications, LLC And Nexstar Media Group, Inc. | Customer lists and advertiser relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | | | | | | | | | $ 13,700,000 | | | |
Raycom Media, Inc., Cordillera Communications, LLC And Nexstar Media Group, Inc. | Customer lists and advertiser relationships | Minimum | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | | | 5 years | | | |
Raycom Media, Inc., Cordillera Communications, LLC And Nexstar Media Group, Inc. | Customer lists and advertiser relationships | Maximum | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | | | 10 years | | | |
Raycom Media, Inc., Cordillera Communications, LLC And Nexstar Media Group, Inc. | Shared service agreement | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | | | | | | | | | $ 13,000,000 | | | |
Omny Studio | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Business acquisition, purchase price | | | $ 8,300,000 | | | | | | | | | |
Goodwill | | | $ 5,300,000 | | | | | | | | | |
Omny Studio | Developed Technology | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | 10 years | | | | | | | | | |
Intangible assets acquired | | | $ 3,800,000 | | | | | | | | | |
Triton Digital Canada, Inc. | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Business acquisition, purchase price | | | | | | $ 160,000,000 | | | | | | |
Goodwill | | | | | | 80,656,000 | | | | | | |
Intangible assets acquired | | | | | | 75,000,000 | | | | | | |
Cash | | | | | | $ 10,515,000 | | | | | | |
Goodwill, Purchase Accounting Adjustments | | | | | | | | | 3,220,000 | | | |
Decrease in fair value of DTL | | | | | | | | | $ (3,600,000) | | | |
Triton Digital Canada, Inc. | Customer lists and advertiser relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | 12 years | | | | | | |
Intangible assets acquired | | | | | | $ 31,000,000 | | | | | | |
Triton Digital Canada, Inc. | Developed Technology | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Intangible assets acquired | | | | | | $ 39,000,000 | | | | | | |
Triton Digital Canada, Inc. | Developed Technology | Minimum | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | | | 8 years | | | |
Triton Digital Canada, Inc. | Developed Technology | Maximum | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | | | 12 years | | | |
Triton Digital Canada, Inc. | Trade names | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | 10 years | | | | | | |
Intangible assets acquired | | | | | | $ 5,000,000 | | | | | | |
Katz Broadcasting Group | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Business acquisition, purchase price | | | | | | | $ 292,000,000 | | | | | |
Goodwill | | | | | | | 203,760,000 | | | | | |
Intangible assets acquired | | | | | | | 32,300,000 | | | | | |
Cash | | | | | | | $ 21,372,000 | | | | | |
Goodwill, Purchase Accounting Adjustments | | | | | | | | | | 5,812,000 | | |
Increase in fair value of property and equipment | | | | | | | | | | 9,900,000 | | |
Decrease in the fair value of program assets | | | | | | | | | | 4,100,000 | | |
Increase in previously reported depreciation expense | | | | | | | | | | 300,000 | | |
Programming Expense, Purchase Accounting Adjustments | | | | | | | | | | $ 300,000 | | |
Gain on fair value remeasurement of acquisition | | | | | | | | $ 5,400,000 | | | | |
Katz Broadcasting Group | E.W. Scripps [Member] | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Noncontrolling interest prior to acquisition | | | | | | | 5.33% | | | | | |
Katz Broadcasting Group | Customer lists and advertiser relationships | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | 5 years | | | | | |
Intangible assets acquired | | | | | | | $ 24,000,000 | | | | | |
Katz Broadcasting Group | Trade names | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Estimated useful life | | | | | | | 10 years | | | | | |
Intangible assets acquired | | | | | | | $ 8,000,000 | | | | | |
Senior Unsecured Notes, Due 2027 | Senior Notes | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Debt issued | | $ 500,000,000 | | | | | | | | | | |
Senior Unsecured Notes, Due 2027 | Senior Notes | Nexstar Media Group, Inc. | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Proceeds from issuance of debt | | $ 500,000,000 | | | | | | | | | | |
Term Loan B-1, Maturing 2026 | Nexstar Media Group, Inc. | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Proceeds from issuance of debt | | | | 240,000,000 | | | | | | | | |
Term Loan B-1, Maturing 2026 | Cordillera Communications, LLC | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Proceeds from issuance of debt | | | | 525,000,000 | | | | | | | | |
Term Loan B-1, Maturing 2026 | Cordillera Communications, LLC And Nexstar Media Group, Inc. | | | | | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | | | | | |
Debt issued | | | | $ 765,000,000 | | | | | | | | |