Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Securities Investments
Cost	$ 46,158	$ 39,133
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	259	1,144
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2,630	2,292
Fair Value	43,787	37,985
Securities Investments
Securities Investments
Cost	6,463	6,354
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	10	11
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2,523	2,173
Fair Value	3,950	4,192
Debt Securities Carried by EGL
Securities Investments
Cost	37,404	28,014
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	94	80
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	8	3
Fair Value	37,490	28,091
Mutual Funds
Securities Investments
Cost	2,291	4,765
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	155	1,053
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	99	116
Fair Value	$ 2,347	$ 5,702

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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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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-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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