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Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Total |  |
Cost | $ 41,727 | $ 34,640
Gross Unrealized Gains | 2,441 | 1,937
Gross Unrealized Losses | 761 | 32
Fair Value | 43,407 | 36,545
Securities Investments [Member] |  |
Securities Investments |  |
Cost | 11,268 | 10,172
Gross Unrealized Gains | 754 | 1,428
Gross Unrealized Losses | 623 | 20
Fair Value | 11,399 | 11,580
Debt Securities Carried by EGL [Member] |  |
Other Securities |  |
Cost | 22,542 | 13,522
Gross Unrealized Gains | 87 | 97
Gross Unrealized Losses | 1 | 0
Fair Value | 22,628 | 13,619
Mutual Funds [Member] |  |
Other Securities |  |
Cost | 7,917 | 10,946
Gross Unrealized Gains | 1,600 | 412
Gross Unrealized Losses | 137 | 12
Fair Value | $ 9,380 | $ 11,346

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