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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

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