Business Operations (Details)	12 Months Ended
Dec. 31, 2016 ft² subsidiary room item	Mar. 31, 2002
Business Operations
Area of casino (in square feet) \| ft²	165,000
Number of retail outlets	6
Number of rooms in AAA Four Diamond hotel \| room	500
Number of wholly owned subsidiaries \| subsidiary	2
Percentage of the issued and outstanding common stock of Dover Downs, Inc. contributed by DVD		100.00%
Percentage of issued and outstanding common stock distributed to parent stockholders		100.00%
Number of Licensed Agents under Delaware State Lottery Code	3
Number of consecutive years for which annual license has been received from the Harness Racing Commission	48 years
Gaming win \| Geographic concentration risk \| Maryland patrons
Risks and Uncertainties
Estimated percentage of gaming win attributable to patrons	29.00%
Capital Club member gaming win \| Geographic concentration risk \| Out of state patrons
Risks and Uncertainties
Estimated percentage of gaming win attributable to patrons	60.00%

Represents the area of the casino.

No definition available.

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- Definition

Disclosure related to the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. Also information about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

+ References

No definition available.

+ Details

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- Definition

Represents the number of licensed agents under the Delaware State Lottery Code.

+ References

No definition available.

+ Details

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- Definition

Represents the number of consecutive years for which annual license has been received from the Delaware Harness Racing Commission.

+ References

No definition available.

+ Details

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- Definition

Represents the number of retail outlets.

+ References

No definition available.

+ Details

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- Definition

Represents the number of rooms in the hotel operated by the entity.

+ References

No definition available.

+ Details

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- Definition

Represents the number of wholly owned subsidiaries of the entity.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of issued and outstanding common stock distributed to parent stockholders.

+ References

No definition available.

+ Details

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- Definition

Represents the percentage of issued and outstanding common stock contributed by parent as a result of a tax-free spin-off transaction.

+ References

No definition available.

+ Details

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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- References

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