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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

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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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