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Description of Business - Additional Information (Details) $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 | Jul. 16, 2018 | Jan. 09, 2018 USD ($) | Aug. 31, 2018 casino | Dec. 31, 2018 USD ($) state gaming_location | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2012
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of gaming locations | gaming_location |  |  |  |  | 9,500 |  |  |
Number of states with gaming positions | state |  |  |  |  | 7 |  |  |
Proceeds from sale of Big Fish Games |  |  | $ 970.7 |  | $ 970.7 | $ 0.0 | $ 0.0 |
Online real-money sports betting and iGaming agreement term |  | 15 years |  |  |  |  |  |
Stock split, conversion ratio | 3 |  |  |  |  |  |  |
Ocean Downs and Racing Services |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 50.00% |  | 100.00% |  |  |  |
Saratoga Casino Holdings LLC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  | 25.00% |  |  |  |  |  |
Miami Valley Gaming LLC |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 50.00% |  |  | 50.00%
Miami Valley Gaming LLC | Casino |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 50.00% |  |  |
Big Fish Games |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of Big Fish Games |  |  | $ 990.0 |  |  |  |  |
MISSISSIPPI |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Number of casinos | casino |  |  |  | 2 |  |  |  |

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