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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Marketable Securities [Abstract] |  |
Cost | $ 58,854 | $ 63,986
Unrealized Loss | (1,321) | (1,598)
Unrealized Gain | 4,506 | 4,036
Fair Value | 62,039 | 66,424
Sponsored funds |  |
Marketable Securities [Abstract] |  |
Cost | 41,463 | 47,084
Unrealized Loss | (928) | (1,294)
Unrealized Gain | 1,380 | 1,059
Fair Value | 41,915 | 46,849
Equity securities |  |
Marketable Securities [Abstract] |  |
Cost | 13,621 | 13,141
Unrealized Loss | (11) | (2)
Unrealized Gain | 2,939 | 2,671
Fair Value | 16,549 | 15,810
Sponsored closed-end funds |  |
Marketable Securities [Abstract] |  |
Cost | 3,770 | 3,761
Unrealized Loss | (382) | (302)
Unrealized Gain | 187 | 306
Fair Value | $ 3,575 | $ 3,765

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: 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 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=82896770&loc=d3e26610-111562 + Details
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