Business Operations (Details) (USD $)	12 Months Ended				3 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended							1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Dover International Speedway item	Sep. 30, 2011 Nashville Superspeedway	Dec. 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	Dec. 31, 2012 Dover facility item	Dec. 31, 2011 Dover facility	Dec. 31, 2010 Dover facility	Dec. 31, 2012 Dover facility NASCAR Sprint Cup Series events item	Dec. 31, 2012 Dover facility NASCAR Nationwide Series events item	Dec. 31, 2012 Dover facility NASCAR Camping World Truck Series events item	Dec. 31, 2012 Dover facility NASCAR K&N Pro Series East event item	Sep. 30, 2012 Gateway facility item acre	Jun. 30, 2010 Gateway facility	Jan. 31, 2011 Memphis Motorsports Park facility	Dec. 31, 2010 Memphis Motorsports Park facility
Business Operations
Number of events promoted									6			2	2	1	1
Number of events scheduled to be promoted				6
Percentage of total revenues									99.00%	90.00%	90.00%
Number of days the Firefly Music Festival is held								3 days
Number of music acts featured in Firefly Music Festival								40
Non-cash impairment charge		$ 15,687,000	$ 809,000		$ 15,687,000												$ 7,964,000		$ 809,000
Severance costs					150,000
Provision for contingent obligation	(321,000)	2,250,000			2,245,000		2,250,000
Decrease in the provision for contingent obligation due to changing interest rates						316,000
Reserve of contingent obligation						1,934,000
Number of parcels of land not sold																1
Proceeds from sale of facility																585,000
Loss on sale of land	52,000															52,000
Area of undeveloped land owned near the facility (in acres)																14
Net proceeds after closing costs from sale of facility and all personal property at the facility																		$ 2,000,000