Debt - Long Term Debt (Parenthetical) (Details)	3 Months Ended	12 Months Ended
Debt - Long Term Debt (Parenthetical) (Details)	Mar. 31, 2025	Dec. 31, 2024
Nexstar [Member] \| Secured Debt [Member] \| Term Loan A, due June 2027 [Member]
Long term Debt [Abstract]
Due date	Jun. 30, 2027	Jun. 30, 2027
Nexstar [Member] \| Secured Debt [Member] \| Term Loan B, due September 2026 [Member]
Long term Debt [Abstract]
Due date	Sep. 30, 2026	Sep. 30, 2026
Nexstar [Member] \| Senior Subordinated Notes [Member] \| 5.625% Notes, due July 2027 [Member]
Long term Debt [Abstract]
Interest rate	5.625%	5.625%
Due date	Jul. 31, 2027	Jul. 31, 2027
Nexstar [Member] \| Senior Subordinated Notes [Member] \| 4.75% Notes, due November 2028 [Member]
Long term Debt [Abstract]
Interest rate	4.75%	4.75%
Due date	Nov. 30, 2028	Nov. 30, 2028
Mission [Member] \| Secured Debt [Member] \| Term Loan B, due June 2028 [Member]
Long term Debt [Abstract]
Due date	Jun. 30, 2028	Jun. 30, 2028
Mission [Member] \| Secured Debt [Member] \| Revolving loans, due June 2027 [Member]
Long term Debt [Abstract]
Due date	Jun. 30, 2027	Jun. 30, 2027