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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale: |  |
Cost | $ 42,612 | $ 50,629
Unrealized Loss | (2,821) | (1,353)
Unrealized Gain | 345 | 975
Fair Value | 40,136 | 50,251
Sponsored Funds [Member] |  |
Trading: |  |
Cost | 32,079 | 39,079
Unrealized Loss | (1,829) | (1,190)
Unrealized Gain | 288 | 423
Fair Value | 30,538 | 38,312
Equity Securities [Member] |  |
Trading: |  |
Cost | 7,236 | 8,421
Unrealized Loss | (648) | 0
Unrealized Gain | 57 | 319
Fair Value | 6,645 | 8,740
Sponsored Closed-End Funds [Member] |  |
Available-for-sale: |  |
Cost | 3,297 | 3,129
Unrealized Loss | (344) | (163)
Unrealized Gain | 0 | 233
Fair Value | $ 2,953 | $ 3,199

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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=27724398&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=27724398&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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