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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Marketable Securities [Abstract]
Total assets measured at fair value	$ 55,000	$ 17,821
Sponsored mutual funds and variable insurance funds [Member]
Marketable Securities [Abstract]
Marketable securities trading	9,365	8,980
Investments of consolidated sponsored investment products [Member]
Marketable Securities [Abstract]
Marketable securities trading	35,560
Equity securities [Member]
Marketable Securities [Abstract]
Marketable securities trading	4,108	3,546
Sponsored closed-end funds [Member]
Marketable Securities [Abstract]
Marketable securities available for sale	2,612	2,469
Nonqualified retirement plan assets [Member]
Marketable Securities [Abstract]
Other assets	3,355	2,826
Level 1 [Member]
Marketable Securities [Abstract]
Total assets measured at fair value	30,367	17,821
Level 1 [Member] | Sponsored mutual funds and variable insurance funds [Member]
Marketable Securities [Abstract]
Marketable securities trading	9,365	8,980
Level 1 [Member] | Investments of consolidated sponsored investment products [Member]
Marketable Securities [Abstract]
Marketable securities trading	10,927
Level 1 [Member] | Equity securities [Member]
Marketable Securities [Abstract]
Marketable securities trading	4,108	3,546
Level 1 [Member] | Sponsored closed-end funds [Member]
Marketable Securities [Abstract]
Marketable securities available for sale	2,612	2,469
Level 1 [Member] | Nonqualified retirement plan assets [Member]
Marketable Securities [Abstract]
Other assets	3,355	2,826
Level 2 [Member]
Marketable Securities [Abstract]
Total assets measured at fair value	24,633	0
Level 2 [Member] | Sponsored mutual funds and variable insurance funds [Member]
Marketable Securities [Abstract]
Marketable securities trading	0	0
Level 2 [Member] | Investments of consolidated sponsored investment products [Member]
Marketable Securities [Abstract]
Marketable securities trading	24,633
Level 2 [Member] | Equity securities [Member]
Marketable Securities [Abstract]
Marketable securities trading	0	0
Level 2 [Member] | Sponsored closed-end funds [Member]
Marketable Securities [Abstract]
Marketable securities available for sale	0	0
Level 2 [Member] | Nonqualified retirement plan assets [Member]
Marketable Securities [Abstract]
Other assets	0	0
Level 3 [Member]
Marketable Securities [Abstract]
Total assets measured at fair value	0	0
Level 3 [Member] | Sponsored mutual funds and variable insurance funds [Member]
Marketable Securities [Abstract]
Marketable securities trading	0	0
Level 3 [Member] | Investments of consolidated sponsored investment products [Member]
Marketable Securities [Abstract]
Marketable securities trading	0
Level 3 [Member] | Equity securities [Member]
Marketable Securities [Abstract]
Marketable securities trading	0	0
Level 3 [Member] | Sponsored closed-end funds [Member]
Marketable Securities [Abstract]
Marketable securities available for sale	0	0
Level 3 [Member] | Nonqualified retirement plan assets [Member]
Marketable Securities [Abstract]
Other assets	$ 0	$ 0

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ 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=7578670&loc=d3e19207-110258

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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 FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15D

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 15C

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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-Paragraph 15E

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of assets categorized as other which are not in and of themselves material enough to require separate disclosure.

+ References

No definition available.

+ Details

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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities 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) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

+ 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 (a)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: 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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