Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Securities Investments
Cost	$ 45,078	$ 39,133
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	283	1,144
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2,958	2,292
Fair Value	42,403	37,985
Securities Investments
Securities Investments
Cost	6,378	6,354
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	12	11
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2,876	2,173
Fair Value	3,514	4,192
Debt Securities Carried by EGL
Securities Investments
Cost	36,484	28,014
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	138	80
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	8	3
Fair Value	36,614	28,091
Mutual Funds
Securities Investments
Cost	2,216	4,765
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	133	1,053
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	74	116
Fair Value	$ 2,275	$ 5,702

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB

-Name Accounting Standards Codification

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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