Long-term Debt (Details 2) (USD $)			6 Months Ended			0 Months Ended				0 Months Ended				0 Months Ended									6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Plainridge Racecourse [Member]	Jun. 30, 2014 New Senior Secured Credit Facility [Member]	Dec. 31, 2013 New Senior Secured Credit Facility [Member]	Oct. 30, 2013 Line Of Credit [Member]	Jun. 30, 2014 Line Of Credit [Member]	Dec. 31, 2013 Line Of Credit [Member]	Oct. 30, 2013 Line Of Credit [Member]	Oct. 30, 2013 Term Loan A Facility [Member]	Jun. 30, 2014 Term Loan A Facility [Member]	Dec. 31, 2013 Term Loan A Facility [Member]	Oct. 30, 2013 Term Loan A Facility [Member]	Oct. 30, 2013 Term Loan B Facility [Member]	Jun. 30, 2014 Term Loan B Facility [Member]	Dec. 31, 2013 Term Loan B Facility [Member]	Oct. 30, 2013 Term Loan B Facility [Member]	Jun. 30, 2014 Senior Secured Credit Facility [Member]	Dec. 31, 2013 Senior Secured Credit Facility [Member]	Jun. 30, 2014 Senior Unsecured Notes5.875 Percent Due November2012 [Member]	Dec. 31, 2013 Senior Unsecured Notes5.875 Percent Due November2012 [Member]	Jun. 30, 2014 Other Long Term Obligation [Member]	Jun. 30, 2014 Other Long Term Obligation [Member] Plainridge Racecourse [Member]
Future minimum repayments of long-term debt
Within one year	$ 27,823,000
1-3 years	80,228,000
3-5 years	392,766,000
Over 5 years	556,122,000
Total minimum payments	1,056,939,000
Long-term Debt
Term of debt						5 years				5 years				7 years
Maximum borrowing capacity									500,000,000				500,000,000				250,000,000
Term loan amount outstanding				736,300,000	750,000,000		0	0			487,500,000	500,000,000			248,800,000	250,000,000
Period for payment of contingent purchase price consideration based on the annual earnings			10 years																				10 years
Debt instrument interest rate stated percentage																				5.875%
Debt	1,056,939,000	1,052,015,000																736,250,000	750,000,000	300,000,000	300,000,000	18,500,000
Letters of credit outstanding				22,400,000	22,100,000
Available borrowing capacity				$ 447,600,000	$ 477,900,000