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Investment in and Advances to Unconsolidated Affiliate (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 21, 2012
Dec. 31, 2014
sqft
acre
mi
Investments in and Advances to Affiliates [Line Items]        
Repayments of Notes Payable $ 10,400,000us-gaap_RepaymentsOfNotesPayable      
Dividend from investment in unconsolidated affiliate 3,500,000us-gaap_EquityMethodInvestmentDividendsOrDistributions 0us-gaap_EquityMethodInvestmentDividendsOrDistributions    
Miami Valley Gaming and Racing [Member]        
Investments in and Advances to Affiliates [Line Items]        
Equity Method Investment, Ownership Percentage       50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
Equity Method Investments     60,000,000us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
 
Note Payable, Term     6 years  
Equity Method Investments, Contingent Payable     10,000,000chdn_EquityMethodInvestmentsContingentPayable
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
 
Acres       120chdn_Acres
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
Race Track, Length       0.625chdn_RaceTrackLength
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
Square footage of Casino       186,000chdn_SquareFootageOfCasino
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
Number of Lottery Terminals 1,570chdn_NumberOfLotteryTerminals
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
     
Equity Method Investments, Facility Cost       204,600,000chdn_EquityMethodInvestmentsFacilityCost
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.00%us-gaap_LongTermDebtPercentageBearingFixedInterestRate
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
     
Funded at Closing [Member] | Miami Valley Gaming and Racing [Member]        
Investments in and Advances to Affiliates [Line Items]        
Equity Method Investments     10,000,000us-gaap_EquityMethodInvestments
/ chdn_EquityMethodInvestmentByFundingAxis
= chdn_FundedAtClosingMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember
 
Notes Payable, Other Payables [Member] | Miami Valley Gaming and Racing [Member]        
Investments in and Advances to Affiliates [Line Items]        
Equity Method Investments     $ 50,000,000us-gaap_EquityMethodInvestments
/ chdn_EquityMethodInvestmentByFundingAxis
= us-gaap_NotesPayableOtherPayablesMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= chdn_MiamiValleyGamingAndRacingMember