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

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

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