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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale: |  |
Cost | $ 75,862 | $ 43,956
Unrealized Loss | (2,207) | (2,885)
Unrealized Gain | 1,252 | 425
Fair Value | 74,907 | 41,496
Sponsored funds [Member] |  |
Trading: |  |
Cost | 61,784 | 31,167
Unrealized Loss | (1,942) | (2,134)
Unrealized Gain | 177 | 298
Fair Value | 60,019 | 29,331
Equity securities [Member] |  |
Trading: |  |
Cost | 10,578 | 9,434
Unrealized Loss | 0 | (386)
Unrealized Gain | 895 | 120
Fair Value | 11,473 | 9,168
Sponsored closed-end funds [Member] |  |
Available-for-sale: |  |
Cost | 3,500 | 3,355
Unrealized Loss | (265) | (365)
Unrealized Gain | 180 | 7
Fair Value | $ 3,415 | $ 2,997

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