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Basis Of Presentation and Summary of Significant Accounting Policies - Promotional Allowance (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Promotional Allowance [Line Items] |  |  |
Promotional allowances | $ 21.5 | $ 17.1 | $ 9.4
Estimated cost of providing promotional allowances | 5.7 | 4.5 | 1.9
Racing Operations |  |  |
Promotional Allowance [Line Items] |  |  |
Promotional allowances | 1.0 | 2.0 | 2.3
Online Operations |  |  |
Promotional Allowance [Line Items] |  |  |
Promotional allowances | 9.3 | 6.5 | 2.7
Gaming Operations |  |  |
Promotional Allowance [Line Items] |  |  |
Promotional allowances | $ 11.2 | $ 8.7 | $ 4.4

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- Definition Estimated Cost Of Providing Promotional Allowances + References No definition available. + Details
Name: | chdn_EstimatedCostOfProvidingPromotionalAllowances
Namespace Prefix: | chdn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | chdn_PromotionalAllowanceLineItems
Namespace Prefix: | chdn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the estimated retail value of accommodations, food and beverage, and other services furnished to guests without charge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 605 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6472957&loc=d3e51325-107943 + Details
Name: | us-gaap_PromotionalAllowances
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration