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Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Variable Interest Entity [Line Items] |  |  |
Advanced sales of personal seat licenses, contractual life, term one | 1 year |  |
Advanced sales of personal seat licenses, contractual life, term two | 30 years |  |
Goodwill impairment | $ 0 |  |
Indefinite-lived intangible assets impairment | 0 |  |
Research & development expenditures | 39,000,000 | $ 39,400,000 | $ 0
Advertising and marketing expense | 151,000,000 | 130,700,000 | 28,800,000
Income tax benefit derived from share based compensation costs | $ 4,900,000 | 0 | 0
Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Gaming tax rate | 1.50% |  |
Pari-Mutuel tax rate | 0.50% |  |
Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Gaming tax rate | 46.00% |  |
Pari-Mutuel tax rate | 10.00% |  |
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 |  |
Game Software Development | Minimum |  |  |
Variable Interest Entity [Line Items] |  |  |
Capitalized computer software useful life | 18 months |  |
Game Software Development | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Capitalized computer software useful life | 3 years |  |
Enhancements to Game Software Development | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Capitalized computer software useful life | 18 months |  |
Internally developed and purchased third party software |  |  |
Variable Interest Entity [Line Items] |  |  |
Capitalized computer software developed or acquired for internal use | $ 12,200,000 | 8,900,000 | 7,400,000
Capitalized computer software estimated useful life of capitalized costs | 3 years |  |
Capitalized computer software developed or acquired for internal use, amortization expense | $ 8,900,000 | 7,000,000 | 6,000,000
Internally developed and purchased third party software | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Property, plant, and equipment, useful life | 3 years |  |
TwinSpires |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage earned on total amount wagered | 18.40% |  |
Research & development expenditures | $ 0 | 0 | 0
Racing |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage earned on total amount wagered | 11.00% |  |
Research & development expenditures | $ 0 | $ 0 | $ 0
Social Casino Games |  |  |
Variable Interest Entity [Line Items] |  |  |
Average life of virtual goods | 3 days |  |
Other Casual Games |  |  |
Variable Interest Entity [Line Items] |  |  |
Average life of virtual goods | 4 months |  |
Free-to-play Game Software | Game Software Development | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Capitalized computer software useful life | 18 months |  |
Premium | Game Software Development | Maximum |  |  |
Variable Interest Entity [Line Items] |  |  |
Capitalized computer software useful life | 12 months |  |

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- Definition The Company recognizes gaming tax expense based on the statutorily required percentage of revenue that is required to be paid to state and local jurisdictions in the states in which wagering occurs. Individual states and local jurisdictions set gaming tax rates. + References No definition available. + Details
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