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Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Grandstands and buildings | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years |  |
Grandstands and buildings | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 40 years |  |
Equipment | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 2 years |  |
Equipment | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years |  |
Furniture and fixtures | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 2 years |  |
Furniture and fixtures | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years |  |
Tracks and other improvements | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 10 years |  |
Tracks and other improvements | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 20 years |  |
Internally developed and purchased third party software |  |  |
Variable Interest Entity [Line Items] |  |  |
Capitalized computer software developed or acquired for internal use | $ 9.7 | $ 7.2 | $ 6.7
Capitalized computer software developed or acquired for internal use, amortization expense | $ 7.3 | 6.3 | 6.0
Internally developed and purchased third party software | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 3 years |  |
Continuing Operations |  |  |
Variable Interest Entity [Line Items] |  |  |
Advertising and marketing expense | $ 28.7 | $ 24.8 | $ 23.1

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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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- Definition The total expense recognized in the period for promotion, public relations, and brand or product advertising. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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- Definition 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. + References No definition available. + Details
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