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Acquisitions - Summary of Estimated Preliminary Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 19, 2019 | Aug. 08, 2019 | Jun. 18, 2019 | Jan. 02, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 2,950,587 | $ 2,596,863 | $ 2,579,417
Cash paid for acquisitions |  |  |  |  | 1,514,183 | $ 328,433 | $ 0
Nexstar Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash | $ 0 |  |  |  |  |  |
Accounts receivable | 34,680 |  |  |  |  |  |
Prepaid and other current assets | 3,926 |  |  |  |  |  |
Property and equipment | 40,821 |  |  |  |  |  |
Goodwill | 115,225 |  |  |  |  |  |
Right-of-use assets for operating leases | 0 |  |  |  |  |  |
Other noncurrent assets | 237 |  |  |  |  |  |
Total assets acquired | 799,205 |  |  |  |  |  |
Accounts payable | 2,037 |  |  |  |  |  |
Accrued liabilities | 7,294 |  |  |  |  |  |
Deferred income tax liability | 0 |  |  |  |  |  |
Operating lease liabilities - noncurrent | 20,346 |  |  |  |  |  |
Other noncurrent liabilities | 426 |  |  |  |  |  |
Total liabilities assumed | 30,103 |  |  |  |  |  |
Net assets acquired | 769,102 |  |  |  |  |  |
Less: cash acquired | 0 |  |  |  |  |  |
Less: fair value of existing ownership | 0 |  |  |  |  |  |
Cash paid for acquisitions | 769,102 |  |  |  |  |  |
Dispatch Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  | $ 2,363 |  |  |  |  |
Accounts receivable |  | 26,568 |  |  |  |  |
Prepaid and other current assets |  | 6,092 |  |  |  |  |
Property and equipment |  | 40,418 |  |  |  |  |
Goodwill |  | 197,829 |  |  |  |  |
Right-of-use assets for operating leases |  | 0 |  |  |  |  |
Other noncurrent assets |  | 0 |  |  |  |  |
Total assets acquired |  | 668,951 |  |  |  |  |
Accounts payable |  | 954 |  |  |  |  |
Accrued liabilities |  | 9,011 |  |  |  |  |
Deferred income tax liability |  | 98,287 |  |  |  |  |
Operating lease liabilities - noncurrent |  | 226 |  |  |  |  |
Other noncurrent liabilities |  | 0 |  |  |  |  |
Total liabilities assumed |  | 108,478 |  |  |  |  |
Net assets acquired |  | 560,473 |  |  |  |  |
Less: cash acquired |  | (2,363) |  |  |  |  |
Less: fair value of existing ownership |  | 0 |  |  |  |  |
Cash paid for acquisitions |  | 558,110 |  |  |  |  |
Justice & Quest |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  | $ 0 |  |  |  |
Accounts receivable |  |  | 8,501 |  |  |  |
Prepaid and other current assets |  |  | 6,987 |  |  |  |
Property and equipment |  |  | 361 |  |  |  |
Goodwill |  |  | 23,558 |  |  |  |
Right-of-use assets for operating leases |  |  | 52,553 |  |  |  |
Other noncurrent assets |  |  | 5,253 |  |  |  |
Total assets acquired |  |  | 97,213 |  |  |  |
Accounts payable |  |  | 725 |  |  |  |
Accrued liabilities |  |  | 4,236 |  |  |  |
Deferred income tax liability |  |  | (471) |  |  |  |
Operating lease liabilities - noncurrent |  |  | 0 |  |  |  |
Other noncurrent liabilities |  |  | 2,677 |  |  |  |
Total liabilities assumed |  |  | 7,167 |  |  |  |
Net assets acquired |  |  | 90,046 |  |  |  |
Less: cash acquired |  |  | 0 |  |  |  |
Less: fair value of existing ownership |  |  | (12,995) |  | (8,000) |  |
Cash paid for acquisitions |  |  | 77,051 |  |  |  |
Gray Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  | $ 0 |  |  |
Accounts receivable |  |  |  | 5,553 |  |  |
Prepaid and other current assets |  |  |  | 987 |  |  |
Property and equipment |  |  |  | 11,757 |  |  |
Goodwill |  |  |  | 18,756 |  |  |
Right-of-use assets for operating leases |  |  |  | 0 |  |  |
Other noncurrent assets |  |  |  | 18 |  |  |
Total assets acquired |  |  |  | 111,760 |  |  |
Accounts payable |  |  |  | 1 |  |  |
Accrued liabilities |  |  |  | 1,604 |  |  |
Deferred income tax liability |  |  |  | 0 |  |  |
Operating lease liabilities - noncurrent |  |  |  | 235 |  |  |
Other noncurrent liabilities |  |  |  | 0 |  |  |
Total liabilities assumed |  |  |  | 1,840 |  |  |
Net assets acquired |  |  |  | 109,920 |  |  |
Less: cash acquired |  |  |  | 0 |  |  |
Less: fair value of existing ownership |  |  |  | 0 |  |  |
Cash paid for acquisitions |  |  |  | 109,920 |  |  |
Recent Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash |  |  |  |  | 2,363 |  |
Accounts receivable |  |  |  |  | 75,302 |  |
Prepaid and other current assets |  |  |  |  | 17,992 |  |
Property and equipment |  |  |  |  | 93,357 |  |
Goodwill |  |  |  |  | 355,368 |  |
Intangible assets acquired |  |  |  |  | 386,600 |  |
Right-of-use assets for operating leases |  |  |  |  | 52,553 |  |
Other noncurrent assets |  |  |  |  | 5,508 |  |
Total assets acquired |  |  |  |  | 1,677,129 |  |
Accounts payable |  |  |  |  | 3,717 |  |
Accrued liabilities |  |  |  |  | 22,145 |  |
Deferred income tax liability |  |  |  |  | 97,816 |  |
Operating lease liabilities - noncurrent |  |  |  |  | 20,807 |  |
Other noncurrent liabilities |  |  |  |  | 3,103 |  |
Total liabilities assumed |  |  |  |  | 147,588 |  |
Net assets acquired |  |  |  |  | 1,529,541 |  |
Less: cash acquired |  |  |  |  | (2,363) |  |
Less: fair value of existing ownership |  |  |  |  | (12,995) |  |
Cash paid for acquisitions |  |  |  |  | 1,514,183 |  |
Network affiliation agreements | Nexstar Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired | 123,919 |  |  |  |  |  |
Network affiliation agreements | Dispatch Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  | 60,767 |  |  |  |  |
Network affiliation agreements | Justice & Quest |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | 0 |  |  |  |
Network affiliation agreements | Gray Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 14,420 |  |  |
Network affiliation agreements | Recent Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | 199,106 |  |
Retransmission agreements | Nexstar Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired | 83,413 |  |  |  |  |  |
Retransmission agreements | Dispatch Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  | 38,569 |  |  |  |  |
Retransmission agreements | Justice & Quest |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | 0 |  |  |  |
Retransmission agreements | Gray Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 12,957 |  |  |
Retransmission agreements | Recent Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | 134,939 |  |
Other intangible assets | Nexstar Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired | 22,715 |  |  |  |  |  |
Other intangible assets | Dispatch Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  | 362 |  |  |  |  |
Other intangible assets | Justice & Quest |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | 0 |  |  |  |
Other intangible assets | Gray Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | 251 |  |  |
Other intangible assets | Recent Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | 23,328 |  |
FCC licenses | Nexstar Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired | $ 374,269 |  |  |  |  |  |
FCC licenses | Dispatch Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  | $ 295,983 |  |  |  |  |
FCC licenses | Justice & Quest |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 0 |  |  |  |
FCC licenses | Gray Stations |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  | $ 47,061 |  |  |
FCC licenses | Recent Acquisitions |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  |  |  | $ 717,313 |  |

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