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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Marketable securities: |  |
Cost | $ 58,031 | $ 63,986
Unrealized Loss | 1,265 | 1,598
Unrealized Gain | 4,635 | 4,036
Fair Value | 61,401 | 66,424
Sponsored funds |  |
Marketable securities: |  |
Cost | 40,235 | 47,084
Unrealized Loss | (895) | (1,294)
Unrealized Gain | 1,333 | 1,059
Fair Value | 40,673 | 46,849
Fair Value | 40,673 | 46,849
Equity securities |  |
Marketable securities: |  |
Cost | 14,018 | 13,141
Unrealized Loss | 10 | 2
Unrealized Gain | 3,000 | 2,671
Fair Value | 17,008 | 15,810
Fair Value | 17,008 | 15,810
Sponsored closed-end funds |  |
Marketable securities: |  |
Cost | 3,778 | 3,761
Unrealized Loss | 360 | 302
Unrealized Gain | 302 | 306
Fair Value | 3,720 | 3,765
Fair Value | $ 3,720 | $ 3,765

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