| Document And Entity Information | Sep. 19, 2019 |
| Cover [Abstract] | |
| Entity Registrant Name | Nexstar Media Group, Inc. |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | This Amendment No. 1 on Form 8-K/A (this “Form 8-K/A”) is an amendment to the Current Report on Form 8-K of Nexstar Media Group, Inc. (“Nexstar”), filed on September 20, 2019 (the “Original Form 8-K”). This Form 8-K/A is being filed to provide financial statements of the acquired business required by Item 9.01 (a) and the pro forma financial information required by Item 9.01 (b). This Form 8-K/A supplements Item 9.01 of the Original Form 8-K. |
| Entity Central Index Key | 0001142417 |
| Document Period End Date | Sep. 19, 2019 |
| Entity Emerging Growth Company | false |
| Entity File Number | 000-50478 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 23-3083125 |
| Entity Address, Address Line One | 545 E. John Carpenter |
| Entity Address, Address Line Two | Freeway |
| Entity Address, Address Line Three | Suite 700 |
| Entity Address, City or Town | Irving |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75062 |
| City Area Code | (972) |
| Local Phone Number | 373-8800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock |
| Trading Symbol | NXST |
| Security Exchange Name | NASDAQ |
