Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended					6 Months Ended		12 Months Ended	6 Months Ended									3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segment	Jun. 30, 2013	Jun. 30, 2014 American Multi-Cinema, Inc. [Member]	Jun. 30, 2013 American Multi-Cinema, Inc. [Member]	Jun. 30, 2014 ONTARIO Entertainment Retail Center Properties [Member] properties	Jun. 30, 2014 ONTARIO Four Entertainment Retail Centers [Member]	Jun. 30, 2013 ONTARIO Four Entertainment Retail Centers [Member]	Dec. 31, 2013 ONTARIO Four Entertainment Retail Centers [Member]	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [Member]	Jun. 30, 2014 Building [Member]	Jun. 30, 2014 Furniture, fixtures & equipment [Member] Minimum [Member]	Jun. 30, 2014 Furniture, fixtures & equipment [Member] Maximum [Member]	Jun. 30, 2014 Share Options [Member]	Jun. 30, 2013 Share Options [Member]	Jun. 30, 2014 Restricted Stock [Member] Employee [Member]	Jun. 30, 2013 Restricted Stock [Member] Employee [Member]	Jun. 30, 2014 Restricted Stock [Member] Minimum [Member] Employee [Member]	Jun. 30, 2014 Restricted Stock [Member] Maximum [Member] Employee [Member]	Jun. 30, 2014 Restricted Share Units [Member]	Jun. 30, 2014 Restricted Share Units [Member] Non-Employee Trustees [Member]	Jun. 30, 2013 Restricted Share Units [Member] Non-Employee Trustees [Member]
Operating Segments
Number of Reportable Operating Segments			4
Rental Properties [Abstract]
Estimated useful live of buildings (in years)													40 years	3 years	25 years
Revenue Recognition [Abstract]
Percentage rents			$ 500,000	$ 900,000
Gain (Loss) on Contract Termination			123,000	0
Concentrations of Risk [Abstract]
Percent of megaplex theatre rental leased by AMC					26.00%
Rental revenue	69,918,000	60,160,000	136,349,000	120,548,000	43,600,000	42,700,000
Percentage of lease revenue in total revenue					24.00%	26.00%		11.00%	13.00%
Total revenue	91,787,000	82,952,000	181,643,000	165,903,000				20,100,000	21,200,000
Number of real estate properties (in properties)							4
Net assets of wholly owned subsidiaries								227,500,000		227,200,000
Wholly owned subsidiaries percentage in net assets								13.00%		13.00%
Share-based Compensation [Abstract]
Share based compensation			4,671,000	3,166,000
Share based compensation, future vesting period minimum (in years)			4 years								3 years	4 years				4 years				3 years	4 years
Range of settlement date for shares for non-employee trustee from grant date, minimum (in years)			1 year																			1 year
Stock-option expense																729,000	438,000
Share based compensation expense related to employees and trustees			$ 3,400,000															$ 3,400,000	$ 2,400,000				$ 534,000	$ 321,000