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Basis Of Presentation and Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Grandstands and buildings | Minimum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Grandstands and buildings | Maximum
Property, Plant and Equipment [Line Items]
Useful life	40 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Tracks and other improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Tracks and other improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	20 years
Internal use software
Property, Plant and Equipment [Line Items]
Capitalized internal use software	$ 8.9	$ 7.4	$ 7.4
Estimated useful life of capitalized costs	3 years
Capitalized costs, amortization	$ 7.0	$ 6.0	$ 5.1
Game technology and rights, premium paid game
Property, Plant and Equipment [Line Items]
Intangible asset estimated useful life	1 year
Game technology and rights, casual and mid-core free-to-play games
Property, Plant and Equipment [Line Items]
Intangible asset estimated useful life	18 months

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Capitalized Computer Software, Estimated Useful Life of Capitalized Costs

+ References

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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