Summary of Significant Accounting Policies - Cash and Restricted Cash (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 restricted_cash_account	Dec. 31, 2013
Restricted Cash and Cash Equivalents Items [Line Items]
Uninsured cash amounts	$ 904,000,000
Number of restricted cash accounts	4
New York State Racing, Pari-Mutual Wagering And Breeding Law [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	49,000	42,000
Monticello Harness Horsemens Association [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	806,000	229,000
VGM New York Governing Law [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash and cash equivalents	405,000	399,000
Minimum reserve balance	$ 450,000	$ 400,000