Summary of Significant Accounting Policies (Details 6)	12 Months Ended
	Dec. 31, 2011 property Y segment vicepresident	Dec. 31, 2010 Y	Dec. 31, 2009 Y
Stock-Based Compensation
Time period of historical volatility of stock used to estimate expected volatility (in years)	5.82
Weighted-average assumptions used in the Black-Scholes option-pricing model
Risk-free interest rate (as a percent)	1.04%	2.27%	2.80%
Expected volatility (as a percent)	47.60%	48.02%	49.68%
Weighted-average expected life (in years)	5.82	5.73	5.32
Forfeiture rate (as a percent)	5.00%	5.00%	5.00%
Certain Risks and Uncertainties
Number of large properties in terms of net revenues that will face new significant competition in the near term	2
Segment Information
Number of senior vice presidents of regional operations	3
Number of reportable segments	3
Kansas Entertainment
Segment Information
Ownership interest in joint venture (as a percent)	50.00%
Midwest
Segment Information
Ohio properties under construction	2