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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2020
Feb. 23, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Trading Symbol NXST    
Entity Registrant Name NEXSTAR MEDIA GROUP, INC.    
Entity Central Index Key 0001142417    
Current Fiscal Year End Date --12-31    
Entity Well Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 3,644,752,141
Entity Common Stock, Shares Outstanding   43,384,534  
Entity Small Business false    
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 Freeway    
Entity Address, Address Line Two 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    
Document Annual Report true    
Document Transition Report false    
Title of 12(b) Security Class A Common Stock    
Security Exchange Name NASDAQ    
Document incorporated by reference

Portions of the Proxy Statement for the Registrant’s 2021 Annual Meeting of Stockholders will be filed with the Commission within 120 days after the close of the Registrant’s fiscal year and incorporated by reference in Part III of this Annual Report on Form 10-K.