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Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments of consolidated sponsored investment products	$ 95,998	$ 43,227
Total assets measured at fair value	121,382	61,245
Sponsored mutual funds and variable insurance funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	13,813	8,013
Debt securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments of consolidated sponsored investment products	27,609	25,812
Equity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	5,104	4,379
Investments of consolidated sponsored investment products	68,389	17,415
Sponsored closed-end funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities available for sale	2,684	2,656
Nonqualified retirement plan assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other assets, nonqualified retirement plan assets	3,783	2,970
Level 1 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets measured at fair value	92,833	28,110
Level 1 [Member] | Sponsored mutual funds and variable insurance funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	13,813	8,013
Level 1 [Member] | Debt securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments of consolidated sponsored investment products
Level 1 [Member] | Equity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	5,104	4,379
Investments of consolidated sponsored investment products	67,449	10,092
Level 1 [Member] | Sponsored closed-end funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities available for sale	2,684	2,656
Level 1 [Member] | Nonqualified retirement plan assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other assets, nonqualified retirement plan assets	3,783	2,970
Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets measured at fair value	28,549	33,135
Level 2 [Member] | Sponsored mutual funds and variable insurance funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading
Level 2 [Member] | Debt securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments of consolidated sponsored investment products	27,609	25,812
Level 2 [Member] | Equity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading
Investments of consolidated sponsored investment products	940	7,323
Level 2 [Member] | Sponsored closed-end funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities available for sale
Level 2 [Member] | Nonqualified retirement plan assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other assets, nonqualified retirement plan assets
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets measured at fair value
Level 3 [Member] | Sponsored mutual funds and variable insurance funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading
Level 3 [Member] | Debt securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments of consolidated sponsored investment products
Level 3 [Member] | Equity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading
Investments of consolidated sponsored investment products
Level 3 [Member] | Sponsored closed-end funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities available for sale
Level 3 [Member] | Nonqualified retirement plan assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other assets, nonqualified retirement plan assets

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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X

- Definition

Fair value portion of other assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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X

- Definition

Current investment securities of consolidated sponsored investment products, which includes financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer).

+ References

No definition available.

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