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Marketable Securities - Schedule of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Schedule Of Available For Sale And Trading Securities [Line Items]
Cost	$ 54,436	$ 55,037
Unrealized Loss	(1,125)	(891)
Unrealized Gain	5,006	4,129
Fair Value	58,317	58,275
Sponsored mutual funds and variable insurance funds [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Cost	12,378	7,312
Unrealized Loss	(645)	(689)
Unrealized Gain	2,391	1,390
Fair Value	14,124	8,013
Investments of consolidated sponsored investment products [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Cost	35,689	41,367
Unrealized Loss	(459)	(165)
Unrealized Gain	1,418	2,025
Fair Value	36,648	43,227
Equity securities [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Cost	3,702	3,739
Unrealized Gain	1,027	640
Fair Value	4,729	4,379
Sponsored closed-end funds [Member]
Schedule Of Available For Sale And Trading Securities [Line Items]
Cost	2,667	2,619
Unrealized Loss	(21)	(37)
Unrealized Gain	170	74
Fair Value	$ 2,816	$ 2,656

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

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