Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale:
Cost	$ 70,834	$ 75,862
Unrealized Loss	(1,335)	(2,207)
Unrealized Gain	2,663	1,252
Fair Value	72,162	74,907
Sponsored funds
Trading:
Cost	56,235	61,784
Unrealized Loss	(1,115)	(1,942)
Unrealized Gain	540	177
Fair Value	55,660	60,019
Equity securities
Trading:
Cost	10,969	10,578
Unrealized Loss	0	0
Unrealized Gain	1,771	895
Fair Value	12,740	11,473
Sponsored closed-end funds
Available-for-sale:
Cost	3,630	3,500
Unrealized Loss	(220)	(265)
Unrealized Gain	352	180
Fair Value	$ 3,762	$ 3,415

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

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