Annual report pursuant to Section 13 and 15(d)

Investment in RealD - Additional Information (Detail)

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Investment in RealD - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]      
Number of options to purchase common stock     1,085,828
Fair value of options earned   $ 3,402 $ 18,909
Additional options earned to purchase common stock of RealD   136,952  
Exercise price of options $ 0.00667    
License agreement term 6 years    
Cumulative net unrealized holding losses from accumulated other comprehensive income (loss) to earnings   12,610  
Number of shares owned in RealD 1,222,780    
Estimated fair value of company owned shares in RealD 13,707 9,709 27,993
Unrealized holding loss $ 3,998 $ (21,694) $ 9,084