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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale: |  |
Cost | $ 83,048 | $ 43,956
Unrealized Loss | (3,723) | (2,885)
Unrealized Gain | 909 | 425
Fair Value | 80,234 | 41,496
Sponsored Funds [Member] |  |
Trading: |  |
Cost | 69,355 | 31,167
Unrealized Loss | (3,146) | (2,134)
Unrealized Gain | 256 | 298
Fair Value | 66,465 | 29,331
Equity Securities [Member] |  |
Trading: |  |
Cost | 10,217 | 9,434
Unrealized Loss | (356) | (386)
Unrealized Gain | 339 | 120
Fair Value | 10,200 | 9,168
Sponsored Closed-End Funds [Member] |  |
Available-for-sale: |  |
Cost | 3,476 | 3,355
Unrealized Loss | (221) | (365)
Unrealized Gain | 314 | 7
Fair Value | $ 3,569 | $ 2,997

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- Definition Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities 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 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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