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v3.3.1.900

Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale: |  |
Cost | $ 43,956 | $ 50,629
Unrealized Loss | (2,885) | (1,353)
Unrealized Gain | 425 | 975
Fair Value | 41,496 | 50,251
Sponsored funds [Member] |  |
Trading: |  |
Cost | 31,167 | 39,079
Unrealized Loss | (2,134) | (1,190)
Unrealized Gain | 298 | 423
Fair Value | 29,331 | 38,312
Equity securities [Member] |  |
Trading: |  |
Cost | 9,434 | 8,421
Unrealized Loss | (386) | 0
Unrealized Gain | 120 | 319
Fair Value | 9,168 | 8,740
Sponsored closed-end funds [Member] |  |
Available-for-sale: |  |
Cost | 3,355 | 3,129
Unrealized Loss | (365) | (163)
Unrealized Gain | 7 | 233
Fair Value | $ 2,997 | $ 3,199

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