Business Operations (Details) (USD $)	3 Months Ended				12 Months Ended	0 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Nashville Superspeedway Variable Rate Tax Exempt Infrastructure Revenue Bonds, Series 1999	Mar. 31, 2012 Nashville Superspeedway Variable Rate Tax Exempt Infrastructure Revenue Bonds, Series 1999	Dec. 31, 2011 Nashville Superspeedway Variable Rate Tax Exempt Infrastructure Revenue Bonds, Series 1999	Jul. 22, 2012 Dover facility item	Mar. 31, 2013 Dover facility item	Dec. 31, 2012 Dover facility	Dec. 31, 2011 Dover facility	Mar. 31, 2013 Dover facility NASCAR Sprint Cup Series events item	Mar. 31, 2013 Dover facility NASCAR Nationwide Series events item	Mar. 31, 2013 Dover facility NASCAR Camping World Truck Series events item	Mar. 31, 2013 Dover facility NASCAR K&N Pro Series East event item
Business Operations
Number of events scheduled to be promoted							6			2	2	1	1
Percentage of total revenues								99.00%	90.00%
Number of days the Firefly Music Festival is held						3 days
Number of music acts featured in Firefly Music Festival						40
Provision for contingent obligation	$ (22,000)	$ (40,000)			$ 2,250,000
Decrease in the provision for contingent obligation due to changing interest rates			22,000	35,000
Reserve of contingent obligation			$ 1,912,000