Employees Pension and Postretirement Benefits (Details Textual) (USD $)	3 Months Ended	6 Months Ended			6 Months Ended				12 Months Ended		3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010	Jul. 31, 2000	Jun. 30, 2011 SERP Benefits [Member]	Dec. 31, 2010 SERP Benefits [Member]	Aug. 01, 2010 SERP Benefits [Member]	Dec. 31, 2009 SERP Benefits [Member]	Dec. 31, 2010 SERP Benefits [Member] Board of Directors Chairman [Member]	Dec. 31, 2010 SERP Benefits [Member] Chief Executive Officer [Member]	Jun. 30, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2010 Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2011 Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2010 Other Postretirement Benefit Plans, Defined Benefit [Member]	Dec. 31, 2010 Other Postretirement Benefit Plans, Defined Benefit [Member]	Jun. 30, 2011 Canadian Plan [Member]	Jun. 30, 2010 Canadian Plan [Member]	Jun. 30, 2011 Canadian Plan [Member]	Jun. 30, 2010 Canadian Plan [Member]	Jun. 30, 2011 U.S. Internal Revenue Code [Member]	Jun. 30, 2010 U.S. Internal Revenue Code [Member]	Jun. 30, 2011 U.S. Internal Revenue Code [Member]	Jun. 30, 2010 U.S. Internal Revenue Code [Member]
Pension and Other Postretirement Benefit Expense (Textuals) [Abstract]
Lump sum payment under the SERP plan							$ 14,700,000
Accumulated benefit obligation for the SERP					18,200,000	18,100,000
Amortization of actuarial gains					100,000
Coverage amounts life Insurance Policies on Messrs Gelfond and Wechsler					21,500,000
Cash surrender value of life insurance			3,179,000						4,600,000	3,200,000
Postretirement benefits obligation					18,247,000	18,108,000		29,862,000			500,000		500,000		500,000
Maximum amount of Postretirement benefit expensed													100,000	100,000
Companies contribution and expenses																$ 300,000	$ 200,000	$ 500,000	$ 400,000
Companies contribution and expenses											less than 0.1	less than 0.1								less than 0.1	less than 0.1	less than 0.1	less than 0.1
Employees Pension and Postretirement Benefits (Additional Textuals) [Abstract]
Defined benefit pension plan		The Company has an unfunded U.S. defined benefit pension plan, the SERP, covering Richard L. Gelfond, Chief Executive Officer (“CEO”) of the Company and Bradley J. Wechsler, Chairman of the Company’s Board of Directors. The SERP provides for a lifetime retirement benefit from age 55 determined as 75% of the member’s best average 60 consecutive months of earnings over the member’s employment history. The benefits were 50% vested as at July 2000, the SERP initiation date. The vesting percentage increases on a straight-line basis from inception until age 55. As at June 30, 2011 the benefits of Mr. Gelfond were 100% vested. Upon a termination for cause, prior to a change of control, the executive shall forfeit any and all benefits to which such executive may have been entitled, whether or not vested.
Description Of Defined Contribution Pension And Other Postretirement Plans	The Company also maintains defined contribution pension plans for its employees, including its executive officers. The Company makes contributions to these plans on behalf of employees in an amount up to 5% of their base salary subject to certain prescribed maximums.
Percentage of benefits vested since plan inception date				50.00%
Termination Benefit Vested	100.00%	100.00%
Maximum percentage of base salary contributed to Pension Plan by Company		5.00%