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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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