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Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale: |  |
Cost | $ 82,616 | $ 43,956
Unrealized Loss | (3,786) | (2,885)
Unrealized Gain | 675 | 425
Fair Value | 79,505 | 41,496
Sponsored Funds [Member] |  |
Trading: |  |
Cost | 69,144 | 31,167
Unrealized Loss | (3,186) | (2,134)
Unrealized Gain | 186 | 298
Fair Value | 66,144 | 29,331
Equity Securities [Member] |  |
Trading: |  |
Cost | 10,055 | 9,434
Unrealized Loss | (340) | (386)
Unrealized Gain | 333 | 120
Fair Value | 10,048 | 9,168
Sponsored Closed-End Funds [Member] |  |
Available-for-sale: |  |
Cost | 3,417 | 3,355
Unrealized Loss | (260) | (365)
Unrealized Gain | 156 | 7
Fair Value | $ 3,313 | $ 2,997

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