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Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Total    
Cost $ 33,727 $ 41,727
Gross Unrealized Gains 2,626 2,441
Gross Unrealized Losses 55 761
Fair Value 36,298 43,407
Securities Investments [Member]
   
Securities Investments    
Cost 5,056 11,268
Gross Unrealized Gains 1,330 754
Gross Unrealized Losses 14 623
Fair Value 6,372 11,399
Debt Securities Carried by EGL [Member]
   
Other Securities    
Cost 24,052 22,542
Gross Unrealized Gains 102 87
Gross Unrealized Losses 0 1
Fair Value 24,154 22,628
Mutual Funds [Member]
   
Other Securities    
Cost 4,619 7,917
Gross Unrealized Gains 1,194 1,600
Gross Unrealized Losses 41 137
Fair Value $ 5,772 $ 9,380