Related Parties And Transactions (Details)					12 Months Ended					36 Months Ended
		Mar. 10, 2016 USD ($) shares	Jan. 01, 2015	Jun. 28, 2007 USD ($)	Dec. 31, 2015 USD ($) $ / mo	Dec. 31, 2014 USD ($)		Dec. 31, 2013 USD ($)		Dec. 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Dec. 31, 2005
Related Party Transaction [Line Items]
Total operating property					$ 210,298,000	$ 186,889,000	[1]	$ 191,660,000		$ 210,298,000
Current capital lease liability	[2]				5,900,000	5,900,000				5,900,000
Contributions from noncontrolling stockholders					17,000	327,000	[1]	263,000	[1]
Renovation amount					126,622,000	120,913,000				126,622,000
Cinemas 1, 2, 3 [Member]
Related Party Transaction [Line Items]
Management fee					$ 153,000	123,000		183,000
Incremental positive cash flow percentage			100.00%
Average annual positive cash flow period			3 years
Annual cash-on-cash return percent			15.00%
Sutton Hill Capital, LLC [Member]
Related Party Transaction [Line Items]
Related party expense										590,000
Lease term					10 years
Lease expiration date					Jun. 30, 2020
Purchase option					$ 5,900,000					5,900,000
Total operating property					4,700,000					4,700,000
Current capital lease liability					5,900,000					5,900,000
Payment to acquire interest in special purpose entity				$ 3,000,000
Debt amount				26,900,000	19,400,000					$ 19,400,000
Due from related party				$ 2,900,000
Renovation amount											$ 750,000
Sutton Hill Capital's Interest In Sutton Hill Properties [Member]
Related Party Transaction [Line Items]
Special purpose entity purchase option, percentage												25.00%
OBI Management [Member]
Related Party Transaction [Line Items]
Related party expense						397,000		401,000
Estimated related party expense					$ 589,000
Historical related party fees paid as percentage of cash flow received from certain theaters					21.00%
Period of notice required for termination of management agreement					6 months
Executive Vice-President, Margaret Cotter [Member] | Restricted Stock [Member] | 2010 Stock Incentive Plan [Member]
Related Party Transaction [Line Items]
Vesting period of stock options					4 years
Executive Vice-President, Margaret Cotter [Member] | Subsequent Event [Member]
Related Party Transaction [Line Items]
Annual base salary		$ 350,000
Short term incentive target bonus opportunity		$ 105,000
Bonus opportunity, percent of base salary		30.00%
Executive Vice-President, Margaret Cotter [Member] | Subsequent Event [Member] | Restricted Stock [Member] | 2010 Stock Incentive Plan [Member]
Related Party Transaction [Line Items]
Shares granted | shares		4,184
Executive Vice-President, Margaret Cotter [Member] | Subsequent Event [Member] | Class A [Member]
Related Party Transaction [Line Items]
Shares granted | shares		19,921
James Cotter And Michael Forman [Member]
Related Party Transaction [Line Items]
Ownership percentage in live theater play investment					5.00%
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Contributions from noncontrolling stockholders					$ 2,500,000
Bonus contributed to acquire land					$ 255,000
Noncontrolling interests					50.00%					50.00%
Cinema Ground Lease [Member]
Related Party Transaction [Line Items]
Lease expiration date					Jun. 01, 2031
86th Street Cinema [Member]
Related Party Transaction [Line Items]
Management fee					$ 151,000	$ 123,000		$ 183,000
Ellen Cotter And Margaret Cotter [Member]
Related Party Transaction [Line Items]
Monthly due from officers | $ / mo					100
Minimum [Member]
Related Party Transaction [Line Items]
Lease term					1 year
Ownership percentage in equity method					20.00%					20.00%
Vesting period of stock options					0 years
Minimum [Member] | Sutton Hill Capital, LLC [Member]
Related Party Transaction [Line Items]
Purchase option					$ 100,000					$ 100,000

[1] Certain prior period amounts have been reclassified to conform to the current period presentation (see Note 2 - Significant Accounting Policies - Reclassifications).

[2] Represents the lease liability of the option associated with the ground lease purchase of the Village East Cinema. See below for more information.