Summary of Significant Accounting Policies - Additional Information (Details)		1 Months Ended	12 Months Ended
	Feb. 25, 2016 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2018 USD ($) restricted_cash_account shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Sep. 30, 2018 shares	Jun. 30, 2018 shares	Mar. 31, 2018 shares	Mar. 15, 2018 shares	Feb. 28, 2018 USD ($)	Jan. 24, 2018 shares	Jan. 01, 2018 USD ($)	Feb. 17, 2016 shares
Restricted Cash and Cash Equivalents Items [Line Items]
Adoption of ASC 606												$ 54,000
Common stock, shares issued (shares) | shares			34,403,250	32,559,617		32,717,000	32,717,000	32,560,000
Number of shares that may be purchased by warrants (shares) | shares			60,000						60,000
Options exercised, shares | shares			1,700	2,000	18,000
Short-term Investments, Fair Value Disclosure			$ 94,200,000
Restricted cash and cash equivalents for Development Projects				$ 11,200,000
Accrued rent			$ 8,100,000	$ 8,300,000
Gaming Facility License Term				10 years
Number of restricted cash accounts | restricted_cash_account			3
Uninsured cash amounts			$ 223,000
Restricted cash and cash equivalents for Development Projects			21,039,000	$ 41,982,000	$ 26,384,000
Restricted cash and investments for Development Projects			21,039,000	136,431,000
Allowance for doubtful accounts			150,000	171,000
Interest charges capitalized			12,300,000	29,100,000
Number of securities declined to exercise (in shares) | shares					204,706
Advertising expense			11,000,000	1,400,000	$ 1,100,000
Total unrecognized compensation			$ 2,200,000
Vesting period for unrecognized compensation cost to be recognized (in years)			2 years 6 months
Accumulated other comprehensive loss			$ 219,000	315,000
Restricted Cash Equivalents, Noncurrent				30,700,000
Short-term marketable securities			94,500,000	94,500,000
Contract with Customer, Liability, Current				1,500,000
Other Deferred Compensation Arrangements, Liability, Classified, Noncurrent			2,300,000
New York State Racing, Pari-Mutual Wagering And Breeding Law [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents			18,000	25,000
VGM New York Governing Law [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents			205,000	343,000
Monticello Harness Horsemens Association [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents			150,000	324,000
Option Matching Rights [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Number of shares that may be purchased by warrants (shares) | shares											1,666
Number of securities declined to exercise (in shares) | shares													204,706
Montreign [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Gaming Facility License Fee	$ 51,000,000
Term Loan Facility, Term B Loan [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents for Development Projects			21,000,000
Payments of Debt Restructuring Costs		$ 700,000
Other Assets, Fair Value Disclosure			143,000	251,000
Notes Payable to Banks [Member] | Term Loan Facility, Term B Loan [Member] | Montreign Operating [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Debt Instrument, Fair Value Disclosure			440,700,000	449,700,000
Long-term Line of Credit			446,600,000	450,000,000
ASC 606
Restricted Cash and Cash Equivalents Items [Line Items]
Adoption of ASC 606												$ 54,000
Contract with Customer, Liability, Noncurrent			$ 2,100,000
Kien Huat Realty III Limited [Member] | Kien Huat Realty III Limited Investment Agreement [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Common stock, shares issued (shares) | shares			200,000
License [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization										$ 5,800,000
Amortization			$ 6,300,000
Finite-Lived Intangible Assets, Remaining Amortization Period			7 years
Commercial Paper [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term marketable securities				59,400,000
US Treasury Notes Securities [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term marketable securities				$ 35,100,000
Initial Put Option [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Derivative Liability			$ 900,000