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Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Securities Investments
Cost	$ 68,891	$ 46,158
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,416	259
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	3,829	2,630
Fair Value	66,478	43,787
Securities Investments
Securities Investments
Cost	6,483	6,463
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	14	10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	3,727	2,523
Fair Value	2,770	3,950
Debt Securities Carried by EGL
Securities Investments
Cost	37,559	37,404
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	90	94
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	4	8
Fair Value	37,645	37,490
investment Funds [Member]
Securities Investments
Cost	24,849	2,291
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	1,312	155
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	98	99
Fair Value	$ 26,063	$ 2,347

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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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