Acquisitions and Other Recent Business Ventures (Details) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 28, 2014	Nov. 02, 2012 item sqft acre mi	Apr. 05, 2013 item sqft
Acquisitions
Preliminary purchase price allocated to goodwill	$ 277,582,000	$ 492,398,000	$ 1,380,689,000
Acquisition of businesses and gaming and other licenses	118,678,000	73,000	709,450,000
Plainridge Racecourse
Acquisitions
Period for calculation of contingent purchase price consideration based on the annual earnings	10 years
Period contingent purchase price consideration is due following first four fiscal quarters	60 days
Fair value for contingent purchase price consideration	19,200,000
Preliminary purchase price allocated to land and buildings	57,900,000
Preliminary purchase price allocated to goodwill	3,000,000
Plainridge Park Casino Properties
Acquisitions
Number of gaming devices	1,250
Estimated value of Casino	225,000,000
Size of foot clubhouse (in square feet)	55,000
Acquisition of businesses and gaming and other licenses				25,000,000
Harrahs St Louis Gaming and Lodging Facility
Acquisitions
Size of property where facility is located (in acres)					248
Number of parking spaces					4,600
Percentage of voting interest to be acquired					100.00%
Purchase price of the entity to be acquired					615,200,000
Cash acquired					12,300,000
Purchase price allocated to goodwill and other intangible assets					386,500,000
Purchase price allocated to property and equipment, net					225,100,000
Purchase price allocated to total current assets					600,000
Purchase price allocated to total current liabilities					9,300,000
Location of facility in distance from major metropolitan area (in miles)					22
Area of gaming space at facility (in square feet)					645,270
Number of slot machines at facility					2,112
Number of table games at facility					57
Number of poker tables at facility					21
Number of guestroom hotels at facility					502
Number of dining and entertainment venues, structured and surface parking at the facility					9
Definitive Agreement with Jamul Indian Village
Acquisitions
Size of property where facility is located (in acres)	6
Proposed facility development cost						360,000,000
Size of gaming and entertainment facility (in square feet)						200,000
Number of gaming devices						1,700
Number of table games						43
Number of parking spaces						1,800
Maximum conditional loan commitment	400,000,000
Anticipated funding under conditional loan commitment	360,000,000
Note receivable	62,000,000	7,000,000
Interest Receivable	$ 3,300,000	$ 500,000