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Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Total    
Cost $ 40,117 $ 41,727
Gross Unrealized Gains 2,587 2,441
Gross Unrealized Losses 103 761
Fair Value 42,601 43,407
Securities Investments [Member]
   
Securities Investments    
Cost 11,621 11,268
Gross Unrealized Gains 1,444 754
Gross Unrealized Losses 15 623
Fair Value 13,050 11,399
Debt Securities Carried by EGL [Member]
   
Other Securities    
Cost 23,916 22,542
Gross Unrealized Gains 101 87
Gross Unrealized Losses 1 1
Fair Value 24,016 22,628
Mutual Funds [Member]
   
Other Securities    
Cost 4,580 7,917
Gross Unrealized Gains 1,042 1,600
Gross Unrealized Losses 87 137
Fair Value $ 5,535 $ 9,380