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Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities Investments |  |
Cost | $ 49,285 | $ 46,158
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 294 | 259
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,714 | 2,630
Fair Value | 46,865 | 43,787
Securities Investments |  |
Securities Investments |  |
Cost | 6,463 | 6,463
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 17 | 10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 2,603 | 2,523
Fair Value | 3,877 | 3,950
Debt Securities Carried by EGL |  |
Securities Investments |  |
Cost | 40,530 | 37,404
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 133 | 94
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 14 | 8
Fair Value | 40,649 | 37,490
Mutual Funds |  |
Securities Investments |  |
Cost | 2,292 | 2,291
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 144 | 155
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 97 | 99
Fair Value | $ 2,339 | $ 2,347

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References 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) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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