Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands		1 Months Ended	12 Months Ended
	Feb. 25, 2016 USD ($)	Feb. 28, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) restricted_cash_account	Dec. 31, 2015 USD ($) shares	Mar. 01, 2018 USD ($)	Jan. 24, 2018 shares	Feb. 17, 2016 shares
Restricted Cash and Cash Equivalents Items [Line Items]
Marketable Securities, Restricted, Current, Fair Value Disclosure			$ 94,200
Restricted Cash, Noncurrent			11,200
Accrued rent			8,300
Gaming Facility License Term				10 years
Number of restricted cash accounts | restricted_cash_account				3
Uninsured cash amounts			400
Restricted cash and investments for Development Projects			136,431	$ 26,384
Allowance for doubtful accounts			171	171
Interest charges capitalized			29,100
Number of securities declined to exercise (in shares) | shares					204,706
Advertising expense			1,400	$ 1,075	$ 1,064
Total unrecognized compensation			$ 1,700
Vesting period for unrecognized compensation cost to be recognized (in years)			2 years 6 months	2 years 6 months
Accumulated other comprehensive loss			$ 315	$ 0
Restricted Cash Equivalents, Noncurrent			30,700
Marketable Securities, Restricted, Current			94,500
New York State Racing, Pari-Mutual Wagering And Breeding Law [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents			25	39
VGM New York Governing Law [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents			343	354
Monticello Harness Horsemens Association [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents			324	$ 685
Option Matching Rights [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
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
Subsequent Event
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents						$ 2,700
Subsequent Event | Option Matching Rights [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Number of securities declined to exercise (in shares) | shares							1,666
Term Loan Facility, Term B Loan [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Payments of Debt Restructuring Costs		$ 675
Other Assets, Fair Value Disclosure			251
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			449,700
Long-term Line of Credit			$ 450,000