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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

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