Quarterly report pursuant to Section 13 or 15(d)

Investment in Marketable Securities - RealD, Inc. - Additional Information (Detail)

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Investment in Marketable Securities - RealD, Inc. - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]    
Number of shares owned in RealD 1,222,780  
Estimated fair value of company owned shares in RealD $ 11,458 $ 10,443
Unrealized holding gain $ 1,015