Represents the period to terminate the agreement after the request of the party providing the services.

No definition available.

Name:	dde_RelatedPartyTransactionAgreementTerminationPeriodByProviderOfServices
Namespace Prefix:	dde_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period to terminate the agreement after the request of the party receiving the services.

+ References

No definition available.

+ Details

Name:	dde_RelatedPartyTransactionAgreementTerminationPeriodByRecipientOfServices
Namespace Prefix:	dde_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the length of the harness racing track, located on the related party's property used by the entity during its harness racing season.

+ References

No definition available.

+ Details

Name:	dde_RelatedPartyTransactionHarnessRacingTrackLength
Namespace Prefix:	dde_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the minimum ownership percentage of voting power.

+ References

No definition available.

+ Details

Name:	dde_RelatedPartyTransactionMinimumOwnershipPercentageInVotingPower
Namespace Prefix:	dde_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the length of the motorsports superspeedway used by the entity.

+ References

No definition available.

+ Details

Name:	dde_RelatedPartyTransactionMotorsportsSuperspeedwayLength
Namespace Prefix:	dde_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of annual motorsports weekends for which the entity allows related party to use indoor grandstands.

+ References

No definition available.

+ Details

Name:	dde_RelatedPartyTransactionNumberOfAnnualMotorsportsWeekends
Namespace Prefix:	dde_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of companies, between which assets and liabilities are allocated as per various kind of agreements.

+ References

No definition available.

+ Details

Name:	dde_RelatedPartyTransactionNumberOfCompaniesBetweenWhichAssetsAndLiabilitiesAllocated
Namespace Prefix:	dde_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the period to pay for services received after receipt of an invoice at rates agreed upon as per the agreement.

+ References

No definition available.

+ Details

Name:	dde_RelatedPartyTransactionPeriodForPaymentAgainstServicesReceived
Namespace Prefix:	dde_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period of set up and tear down rights granted by the related party, before and after the period beginning from November 1 of each year and ending on April 30 of the following year, covered by the perpetual easement.

+ References

No definition available.

+ Details

Name:	dde_RelatedPartyTransactionPeriodForSetUpAndTearDownRights
Namespace Prefix:	dde_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 57

-Paragraph 2

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(k)(1))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph k

-Subparagraph 1

-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 12

-Subparagraph 3

-Article 6

+ Details

Name:	us-gaap_DueToAffiliateCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Related Parties

-URI http://asc.fasb.org/extlink&oid=16382449

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.1(c))

-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 57

-Paragraph 2

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 07

-Paragraph b

-Subparagraph 1

-Article 6

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

Name:	us-gaap_RevenueFromRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Related Party Transactions (Details) (USD $)	12 Months Ended
Related Party Transactions (Details) (USD $)	Dec. 31, 2012 mi item	Dec. 31, 2011	Dec. 31, 2010
Related Party Transactions
Payable to DVD		$ 11,000
DVD
Related Party Transactions
Costs allocated to DVD	1,865,000	1,963,000	1,977,000
Costs allocated to the entity by DVD	217,000	347,000	222,000
Harness racing track length (in miles)	0.625
Motorsports superspeedway length (in miles)	1
Period for set up and tear down rights	14 days
Number of annual motorsports weekends	2
DVD \| Various agreements
Related Party Transactions
Number of companies between which assets and liabilities are allocated	2
DVD \| Transition Support Services Agreement
Related Party Transactions
Period for payment against services received	30 days
Agreement termination period by recipient of services	90 days
Agreement termination period by provider of services	180 days
Dover International Speedway
Related Party Transactions
Costs allocated to DVD	804,000	855,000	928,000
Costs allocated to the entity by DVD	$ 381,000	$ 397,000	$ 353,000
Chairman of board of directors
Related Party Transactions
Minimum ownership percentage of voting power	50.00%
Chairman of board of directors \| DVD
Related Party Transactions
Minimum ownership percentage of voting power	50.00%