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Investments - Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investments Schedule [Abstract]    
Marketable securities $ 28,968 $ 15,048
Equity method investments 4,070 415
Nonqualified retirement plan assets 4,220 2,970
Total investments $ 37,258 $ 18,433