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Long-term Incentive Plan (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Mar. 21, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 131,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized     84,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized 92,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Allocated Share-based Compensation Expense $ 2,723,000us-gaap_AllocatedShareBasedCompensationExpense $ 5,241,000us-gaap_AllocatedShareBasedCompensationExpense      
Trading Days     20 days    
Share-Based Compensation Arrangements by Share Based Payment Award, Equity Instruments Other than options vested in period 239,500chdn_ShareBasedCompensationArrangementsbyShareBasedPaymentAwardEquityInstrumentsOtherthanoptionsvestedinperiod        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 13,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized        
Omnibus Stock Incentive Plans, 2007 New LTIP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 1,800,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= chdn_OmnibusStockIncentivePlans2007NewLTIPMember
       
Common Stock [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 7 months        
Common Stock [Member] | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 3 years        
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan 20 months        
Performance-Based Awards [Member] | Restricted Stock [Member] | Churchill 2004 and 2007 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number     324,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= chdn_Churchill2004And2007PlanMember
/ us-gaap_StatementEquityComponentsAxis
= chdn_PerformanceBasedAwardsMember