Represents the length of harness racing track used by the related party of the entity.

No definition available.

Name:	dvd_LengthOfHarnessRacingTrackUsedByRelatedParty
Namespace Prefix:	dvd_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the notice period for termination of agreement for service provider.

+ References

No definition available.

+ Details

Name:	dvd_NoticePeriodForTerminationOfAgreementForServiceProvider
Namespace Prefix:	dvd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the notice period for termination of agreement for service receiver.

+ References

No definition available.

+ Details

Name:	dvd_NoticePeriodForTerminationOfAgreementForServiceReceiver
Namespace Prefix:	dvd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of annual motorsports weekends for which use of indoor grandstands is allowed by the related party.

+ References

No definition available.

+ Details

Name:	dvd_NumberOfAnnualMotorsportsWeekendsForWhichUseOfIndoorGrandstandsAllowedByRelatedParty
Namespace Prefix:	dvd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of business days after receipt of an invoice within which the party receiving the services is required to pay.

+ References

No definition available.

+ Details

Name:	dvd_PeriodAfterReceiptOfInvoiceUpToWhichPartyReceivingServicesIsRequiredToPay
Namespace Prefix:	dvd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the period, before and after the period of exclusive use of harness track, for which the related party has set up and tear down rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	dvd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of voting power of the entity held by the related party of the entity.

+ References

No definition available.

+ Details

Name:	dvd_RelatedPartyTransactionMinimumPercentageOfVotingPowerHeldByRelatedParty
Namespace Prefix:	dvd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of voting power of another related party held by the related party.

+ References

No definition available.

+ Details

Name:	dvd_RelatedPartyTransactionMinimumPercentageOfVotingPowerHeldByRelatedPartyInOtherRelatedParty
Namespace Prefix:	dvd_
Data Type:	num:percentItemType
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

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Namespace Prefix:	dvd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).

+ References

Reference 1: 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=26873400&loc=d3e23780-122690

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a

-Article 5

Reference 5: 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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3(a)(2))

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864

+ Details

Name:	us-gaap_DueFromAffiliateCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

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

+ 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

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(e))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Reference 3: 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 4: 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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 07

-Paragraph b

-Subparagraph 1

-Article 6

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=dvd_AdministrativeAndOperatingCostAllocationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_BoardOfDirectorsChairmanMember
Namespace Prefix:
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Period Type:

Related Party Transactions (Details) (USD $)	12 Months Ended
Related Party Transactions (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Related Party Transactions
Amount due from related party		$ 4,000us-gaap_DueFromAffiliateCurrent
Affiliated Entity
Related Party Transactions
Amount due from related party	22,000	4,000
Length of harness racing track used (in miles)	0.625
Period, before and after the period of exclusive use of harness track, for which related party has set up and tear down rights ( in weeks)	14 days
Number of annual motorsports weekends for which use of indoor grandstands is allowed by related party	2
Affiliated Entity \| Various Agreements
Related Party Transactions
Number of companies between which assets and liabilities are allocated	2
Affiliated Entity \| Transition Support Services Agreement
Related Party Transactions
Number of business days after receipt of an invoice within which the party receiving the services is required to pay	30 days
Period within which the agreement may be terminated after the request of the party receiving the services	90 days
Period within which the agreement may be terminated after the request of the party providing the services	180 days
Affiliated Entity \| Dover Facility
Related Party Transactions
Costs for administrative and operating services, including leased space allocated by related party	689,000	801,000	804,000
Administrative and operating service costs allocated to related party	184,000	294,000	381,000
Administrative and Operating Cost Allocation
Related Party Transactions
Costs for administrative and operating services, including leased space allocated by related party	1,910,000	1,854,000	1,865,000
Administrative and operating service costs allocated to related party	$ 240,000	$ 220,000	$ 217,000
Board of Directors Chairman
Related Party Transactions
Minimum percentage of voting power controlled by related party	50.00%
Minimum percentage of voting power of Gaming controlled by other related party	50.00%