Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Securities Investments
Cost	$ 71,360	$ 46,158
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	717	259
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	3,351	2,630
Fair Value	68,726	43,787
Securities Investments
Securities Investments
Cost	6,482	6,463
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	21	10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	3,322	2,523
Fair Value	3,181	3,950
Debt Securities Carried by EGL
Securities Investments
Cost	40,402	37,404
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	166	94
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	5	8
Fair Value	40,563	37,490
investment Funds [Member]
Securities Investments
Cost	24,476	2,291
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	530	155
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	24	99
Fair Value	$ 24,982	$ 2,347

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
-Subparagraph (b)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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