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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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