Annual report pursuant to Section 13 and 15(d)

Summary of Changes in Investment in RealD (Detail)

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Summary of Changes in Investment in RealD (Detail) (USD $)
12 Months Ended 24 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]        
Investment in marketable securities - RealD, Beginning Balance $ 13,707,000 $ 9,709,000 $ 27,993,000  
Fair value of options earned     3,402,000 22,311,000
Exercise of options at $0.00667 per share     8  
Unrealized holding gain (loss) (3,264,000) 3,998,000 (21,694,000)  
Investment in marketable securities - RealD, Ending Balance $ 10,443,000 [1] $ 13,707,000 $ 9,709,000 $ 9,709,000
[1] Investment in RealD is included in investments in and advances to affiliates on the consolidated balance sheets.