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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale: |  |
Cost | $ 70,834 | $ 75,862
Unrealized Loss | (1,335) | (2,207)
Unrealized Gain | 2,663 | 1,252
Fair Value | 72,162 | 74,907
Sponsored funds |  |
Trading: |  |
Cost | 56,235 | 61,784
Unrealized Loss | (1,115) | (1,942)
Unrealized Gain | 540 | 177
Fair Value | 55,660 | 60,019
Equity securities |  |
Trading: |  |
Cost | 10,969 | 10,578
Unrealized Loss | 0 | 0
Unrealized Gain | 1,771 | 895
Fair Value | 12,740 | 11,473
Sponsored closed-end funds |  |
Available-for-sale: |  |
Cost | 3,630 | 3,500
Unrealized Loss | (220) | (265)
Unrealized Gain | 352 | 180
Fair Value | $ 3,762 | $ 3,415

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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=82897076&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=82897076&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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