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Investment in Digital Cinema Implementation Partners (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2012
ProjectionSystem
Mar. 31, 2011
Dec. 31, 2011
Summary of activity with DCIP      
Beginning balance $ 12,798,000    
Equity in income of affiliates 1,790,000 2,438,000  
Ending balance 14,206,000    
Investment in Digital Cinema Implementation Partners (Textual) [Abstract]      
Voting interest in Digital Cinema Implementation Partners 33.00%    
Economic interest in Digital Cinema Implementation Partners 24.30%    
Equity in income of affiliates 1,790,000 2,438,000  
Equipment lease expense   912,000  
Depreciation expense on domestic 35 millimeter projectors   3,541,000  
Digital Cinema Implementation Partners [Member]
      
Summary of activity with DCIP      
Beginning balance 12,798,000    
Cash distribution to DCIP 309,000    
Equity in income of affiliates 1,099,000 1,686,000  
Ending balance 14,206,000   12,798,000
Investment in Digital Cinema Implementation Partners (Textual) [Abstract]      
Equity in income of affiliates 1,099,000 1,686,000  
Digital projection systems leased under operating lease, initial term     12 years
Number of one-year fair value renewal options     10 years
Minimum annual rent per digital projection system     1,000
Minimum annual rent per digital projection system through the end of the lease term     3,000
Number of equipments being leased under master equipment lease agreement 3,461    
Equipment lease expense $ 1,929,000