Acquisitions (Details) | May 01, 2019USD ($)television_station | Mar. 20, 2019USD ($)television_station | Jan. 01, 2019USD ($) | Nov. 30, 2018USD ($) | Mar. 31, 2019USD ($) | Dec. 31, 2018USD ($) |
Business Acquisition [Line Items] | | | | | | |
Other current assets | | | | | $ 30,687,000 | $ 28,899,000 |
Property and equipment | | | | | 254,935,000 | 237,927,000 |
Right-of-use assets | | | $ 46,600,000 | | 43,608,000 | 0 |
Operating lease liabilities | | | | | (37,294,000) | 0 |
Goodwill | | | | | 852,362,000 | 834,013,000 |
Accounts payable | | | | | (32,230,000) | (26,919,000) |
Accrued expenses | | | | | (42,913,000) | (46,112,000) |
Other current liabilities | | | | | (29,081,000) | (25,339,000) |
Deferred tax liability | | | | | (22,061,000) | (25,531,000) |
Raycom Media, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Business acquisition, purchase price | | | 55,000,000 | | | |
Revenue of acquiree since acquisition date | | | | | 5,600,000 | |
Property and equipment | | | 11,721,000 | | | |
Right-of-use assets | | | 296,000 | | | |
Other intangible assets | | | 24,900,000 | | | |
Operating lease liabilities | | | (296,000) | | | |
Goodwill | | | 18,349,000 | | | |
Net purchase price | | | 54,970,000 | | | |
Triton Digital Canada, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Business acquisition, purchase price | | | | $ 160,000,000 | | |
Cash | | | | 10,515,000 | | |
Accounts receivable | | | | 8,879,000 | | |
Other current assets | | | | 679,000 | | |
Property and equipment | | | | 705,000 | | |
Other intangible assets | | | | 75,000,000 | | |
Goodwill | | | | 83,876,000 | | |
Accounts payable | | | | (1,881,000) | | |
Accrued expenses | | | | (2,964,000) | | |
Other current liabilities | | | | (19,000) | | |
Deferred tax liability | | | | (14,577,000) | | |
Net purchase price | | | | $ 160,213,000 | | |
Cordillera Communications, LLC | Subsequent Event | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Business acquisition, purchase price | $ 521,000,000 | | | | | |
Number of businesses acquired | television_station | 15 | | | | | |
Nexstar Media Group, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Business acquisition, purchase price | | $ 580,000,000 | | | | |
Number of businesses acquired | television_station | | 8 | | | | |
Retransmission Agreements, Television Network Affiliate Relationships, Advertiser Relationships | Raycom Media, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Other intangible assets | | | $ 18,100,000 | | | |
Retransmission Agreements, Television Network Affiliate Relationships, Advertiser Relationships | Raycom Media, Inc. | Minimum | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Intangible asset, estimated amortization period | | | 5 years | | | |
Retransmission Agreements, Television Network Affiliate Relationships, Advertiser Relationships | Raycom Media, Inc. | Maximum | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Intangible asset, estimated amortization period | | | 20 years | | | |
Trade Names | Triton Digital Canada, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Intangible asset, estimated amortization period | | | | 10 years | | |
Other intangible assets | | | | $ 5,000,000 | | |
Developed Technology Rights | Triton Digital Canada, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Other intangible assets | | | | $ 39,000,000 | | |
Developed Technology Rights | Triton Digital Canada, Inc. | Minimum | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Intangible asset, estimated amortization period | | | | 8 years | | |
Developed Technology Rights | Triton Digital Canada, Inc. | Maximum | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Intangible asset, estimated amortization period | | | | 12 years | | |
Customer Relationships | Triton Digital Canada, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Intangible asset, estimated amortization period | | | | 12 years | | |
Other intangible assets | | | | $ 31,000,000 | | |
Licensing Agreements | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Indefinite-lived intangible assets - FCC licenses | | | | | $ 164,015,000 | $ 157,215,000 |
Licensing Agreements | Raycom Media, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Indefinite-lived intangible assets - FCC licenses | | | $ 6,800,000 | | | |
Term Loan B, Maturing 2026 | Subsequent Event | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Annual payments of principal | $ 7,700,000 | | | | | |
Term Loan B, Maturing 2026 | Cordillera Communications, LLC | Subsequent Event | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Debt face value | 765,000,000 | | | | | |
Term Loan B, Maturing 2026 | Nexstar Media Group, Inc. | Subsequent Event | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Proceeds from issuance of debt | $ 240,000,000 | | | | | |
LIBOR | Term Loan B, Maturing 2026 | Subsequent Event | | | | | | |
Business Acquisition [Line Items] | | | | | | |
LIBOR plus margin range | 2.75% | | | | | |
Revolving credit facility | Nexstar Media Group, Inc. | | | | | | |
Business Acquisition [Line Items] | | | | | | |
Revolving credit facility | | $ 210,000,000 | | | | |