NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Post-retirement Benefits (Details) - Fisher SERP - Fisher - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Post-retirement Benefits
Estimated projected benefit obligation	$ 14.0
Discount rate for projected benefit obligation (as a percent)	4.92%	5.20%
Benefit payments	$ 1.0	$ 1.0
Actuarial gain (loss)	(0.3)	3.0
Periodic pension expense	1.0	$ 1.0
Sinclair Broadcast Group, LLC
Post-retirement Benefits
Estimated projected benefit obligation	$ 14.0
Discount rate for projected benefit obligation (as a percent)	4.92%	5.20%
Benefit payments	$ 1.0
Actuarial gain (loss)	(0.3)	$ 3.0
Periodic pension expense	1.0	$ 1.0
Accrued Expenses
Post-retirement Benefits
Estimated projected benefit obligation	1.0
Accrued Expenses | Sinclair Broadcast Group, LLC
Post-retirement Benefits
Estimated projected benefit obligation	1.0
Other Long-term Liabilities
Post-retirement Benefits
Estimated projected benefit obligation	13.0
Other Long-term Liabilities | Sinclair Broadcast Group, LLC
Post-retirement Benefits
Estimated projected benefit obligation	$ 13.0