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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale: |  |
Cost | $ 71,342 | $ 75,862
Unrealized Loss | (2,432) | (2,207)
Unrealized Gain | 1,685 | 1,252
Fair Value | 70,595 | 74,907
Sponsored mutual funds |  |
Trading: |  |
Cost | 57,071 | 61,784
Unrealized Loss | (2,185) | (1,942)
Unrealized Gain | 112 | 177
Fair Value | 54,998 | 60,019
Equity securities |  |
Trading: |  |
Cost | 10,705 | 10,578
Unrealized Loss | 0 | 0
Unrealized Gain | 1,269 | 895
Fair Value | 11,974 | 11,473
Sponsored closed-end funds |  |
Available-for-sale: |  |
Cost | 3,566 | 3,500
Unrealized Loss | (247) | (265)
Unrealized Gain | 304 | 180
Fair Value | $ 3,623 | $ 3,415

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