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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale: |  |
Cost | $ 63,986 | $ 75,862
Unrealized Loss | (1,598) | (2,207)
Unrealized Gain | 4,036 | 1,252
Fair Value | 66,424 | 74,907
Sponsored funds |  |
Trading: |  |
Cost | 47,084 | 61,784
Unrealized Loss | (1,294) | (1,942)
Unrealized Gain | 1,059 | 177
Fair Value | 46,849 | 60,019
Equity securities |  |
Trading: |  |
Cost | 13,141 | 10,578
Unrealized Loss | (2) | 0
Unrealized Gain | 2,671 | 895
Fair Value | 15,810 | 11,473
Sponsored closed-end funds |  |
Available-for-sale: |  |
Cost | 3,761 | 3,500
Unrealized Loss | (302) | (265)
Unrealized Gain | 306 | 180
Fair Value | $ 3,765 | $ 3,415

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