Commitments and Contingencies - Additional Information (Details) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Oct. 31, 2005 USD ($) a	Oct. 31, 2004 a	Mar. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)
Environmental remediation
Amount of environmental risk insurance policy purchased	$ 10.0
Mountaineer Pari-mutuel Clerks
Expenses under the terms of the ground lease
Renewal term			1 year
Presque Isle Downs
Environmental remediation
Area of real property acquired (in acres) | a		229
GEIDC
Environmental remediation
Area of real property sold (in acres) | a	205
The borrowers
Regulatory gaming assessments
Borrowings to fund initial development of gaming			$ 99.9
The borrowers | Initial funding by Pennsylvania General Fund
Regulatory gaming assessments
Borrowings to fund initial development of gaming			$ 36.1
Number of licensees operational after which repayment of borrowing from general fund would commence | item			14
The borrowers | Additional funding by Pennsylvania Property Tax Relief Reserve Fund
Regulatory gaming assessments
Borrowings to fund initial development of gaming			$ 63.8
MTR Gaming
Regulatory gaming assessments
Estimated total obligation for assessments			4.1	$ 4.1
Estimated total obligation residual amount, current and noncurrent			1.7	1.8
Obligations paid			0.1
MTR Gaming | Initial funding by Pennsylvania General Fund
Regulatory gaming assessments
Estimated total obligation for assessments			1.9	$ 1.9
MTR Gaming | Additional funding by Pennsylvania Property Tax Relief Reserve Fund
Regulatory gaming assessments
Estimated total proportionate share of assessment upon gaming facilities			$ 4.0
Period for quarterly payments of proportionate share of funding for assessments			10 years
Scioto Downs
Expenses under the terms of the ground lease
Renewal term			2 years