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Investment In and Advances To Unconsolidated Affiliate (Details) (USD $) | 12 Months Ended | 0 Months Ended | 34 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 21, 2012 | Dec. 31, 2014 sqft mi
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Current Assets | $ 24,943,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets | $ 18,001,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets |  |  | $ 24,943,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
Equity in gains (losses) of unconsolidated investments | 6,328,000 us-gaap_IncomeLossFromEquityMethodInvestments | (4,142,000)us-gaap_IncomeLossFromEquityMethodInvestments | (1,701,000)us-gaap_IncomeLossFromEquityMethodInvestments |  |
Investment Affiliate-Property Plant & Equipment | 130,868,000 chdn_EquityMethodInvestmentPropertyPlantEquipment | 140,793,000 chdn_EquityMethodInvestmentPropertyPlantEquipment |  |  | 130,868,000 chdn_EquityMethodInvestmentPropertyPlantEquipment
Equity Method Investment, Summarized Financial Information, Noncurrent Assets | 105,059,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets | 80,408,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets |  |  | 105,059,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
Equity Method Investment, Summarized Financial Information, Assets | 260,870,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets | 239,202,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets |  |  | 260,870,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
Equity Method Investment, Summarized Financial Information, Current Liabilities | 16,775,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities | 36,324,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities |  |  | 16,775,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
Equity Method Investment-Long-term Debt, Current Maturities | 8,332,000 chdn_EquityMethodInvestmentLongtermDebtCurrentMaturities | 8,471,000 chdn_EquityMethodInvestmentLongtermDebtCurrentMaturities |  |  | 8,332,000 chdn_EquityMethodInvestmentLongtermDebtCurrentMaturities
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities | 26,584,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities | 32,287,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities | 50,000,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities |  | 26,584,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
Investment Affiliate-Other Liabilities | 83,000 chdn_InvestmentAffiliateOtherLiabilities | 75,000 chdn_InvestmentAffiliateOtherLiabilities |  |  | 83,000 chdn_InvestmentAffiliateOtherLiabilities
Equity Method Investment Summarized Financial Information, Equity | 209,096,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity | 162,045,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity |  |  | 209,096,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
Equity Method Investment, Summarized Financial Information, Liabilities and Equity | 260,870,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity | 239,202,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity |  |  | 260,870,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilitiesAndEquity
Investment Affiliate-Gaming Revenue | 126,111,000 chdn_EquityMethodInvestmentGamingRevenue | 6,472,000 chdn_EquityMethodInvestmentGamingRevenue | 0 chdn_EquityMethodInvestmentGamingRevenue |  |
Investment Affiliate-Non-Gaming Revenue | 6,257,000 chdn_EquityMethodInvestmentNonGamingRevenue | 5,479,000 chdn_EquityMethodInvestmentNonGamingRevenue | 109,000 chdn_EquityMethodInvestmentNonGamingRevenue |  |
Equity Method Investment, Summarized Financial Information, Revenue | 132,368,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue | 11,951,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue | 109,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue |  |
Investment Affiliate-Expenses | 97,385,000 chdn_EquityMethodInvestmentExpenses | 10,815,000 chdn_EquityMethodInvestmentExpenses | 242,000 chdn_EquityMethodInvestmentExpenses |  |
Equity Method, Depreciation & Amortization | 12,299,000 chdn_EquityMethodDepreciationAmortization | 935,000 chdn_EquityMethodDepreciationAmortization | 7,000 chdn_EquityMethodDepreciationAmortization |  |
Investment Affiliate-Pre-Opening Expenses | 54,000 chdn_EquityMethodInvestmentPreOpeningExpenses | 7,240,000 chdn_EquityMethodInvestmentPreOpeningExpenses | 1,079,000 chdn_EquityMethodInvestmentPreOpeningExpenses |  |
Equity Method Investment Operating Income Loss | 22,630,000 chdn_EquityMethodInvestmentOperatingIncomeLoss | (7,039,000)chdn_EquityMethodInvestmentOperatingIncomeLoss | (1,219,000)chdn_EquityMethodInvestmentOperatingIncomeLoss |  |
Investment Affiliate-Interest | (4,829,000)chdn_EquityMethodInvestmentInterest | (397,000)chdn_EquityMethodInvestmentInterest | 0 chdn_EquityMethodInvestmentInterest |  |
Equity Method Investment, Summarized Financial Information, Net Income (Loss) | 17,801,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss | (7,436,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss | (1,219,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss |  |
Investment in joint ventures | (17,906,000)us-gaap_PaymentsToAcquireInterestInJointVenture | (70,500,000)us-gaap_PaymentsToAcquireInterestInJointVenture | (19,850,000)us-gaap_PaymentsToAcquireInterestInJointVenture |  |
Equity Method Investment, Ownership Percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
Other Investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Equity in gains (losses) of unconsolidated investments | (2,504,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = chdn_OtherInvestmentsSegmentMember | 424,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = chdn_OtherInvestmentsSegmentMember | 322,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = chdn_OtherInvestmentsSegmentMember |  |
Miami Valley Gaming and Racing [Member] | Other Investments |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Equity in gains (losses) of unconsolidated investments | 8,900,000 us-gaap_IncomeLossFromEquityMethodInvestments / chdn_CasinoAxis = chdn_MiamiValleyGamingAndRacingMember / us-gaap_StatementBusinessSegmentsAxis = chdn_OtherInvestmentsSegmentMember | (3,718,000)us-gaap_IncomeLossFromEquityMethodInvestments / chdn_CasinoAxis = chdn_MiamiValleyGamingAndRacingMember / us-gaap_StatementBusinessSegmentsAxis = chdn_OtherInvestmentsSegmentMember | (610,000)us-gaap_IncomeLossFromEquityMethodInvestments / chdn_CasinoAxis = chdn_MiamiValleyGamingAndRacingMember / us-gaap_StatementBusinessSegmentsAxis = chdn_OtherInvestmentsSegmentMember |  |
Miami Valley Gaming and Racing [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Race Track, Length | 0.000625 chdn_RaceTrackLength / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |  |  |  | 0.000625 chdn_RaceTrackLength / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember
Equity Method Investments |  |  |  | 60,000,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |
Note Payable, Term |  |  |  | 6 years |
Equity Method Investments, Contingent Payable |  |  |  | 10,000,000 chdn_EquityMethodInvestmentsContingentPayable / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |
Acres |  | 120 chdn_Acres / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |  |  |
Square footage of Casino | 186,000 chdn_SquareFootageOfCasino / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |  |  |  | 186,000 chdn_SquareFootageOfCasino / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember
Equity Method Investments, Facility Cost |  | 204,600,000 chdn_EquityMethodInvestmentsFacilityCost / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |  |  |
Investment in joint ventures | (14,600,000)us-gaap_PaymentsToAcquireInterestInJointVenture / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |  |  |  | (105,000,000)us-gaap_PaymentsToAcquireInterestInJointVenture / 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 |  |  |  | 10,000,000 us-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 |  |  |  | $ 50,000,000 us-gaap_EquityMethodInvestments / chdn_EquityMethodInvestmentByFundingAxis = us-gaap_NotesPayableOtherPayablesMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |
Minimum | Miami Valley Gaming and Racing [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Number of Lottery Terminals |  | 1,580 chdn_NumberOfLotteryTerminals / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = chdn_MiamiValleyGamingAndRacingMember |  |  |

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