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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	Mar. 31, 2013	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets measured at fair value	$ 61,485	$ 61,245
Sponsored mutual funds and variable insurance funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	14,124	8,013
Investments of consolidated sponsored investment products [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	36,648	43,227
Equity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	4,729	4,379
Sponsored closed-end funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities available for sale	2,816	2,656
Nonqualified retirement plan assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other assets, nonqualified retirement plan assets	3,168	2,970
Level 1 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets measured at fair value	31,321	28,110
Level 1 [Member] | Sponsored mutual funds and variable insurance funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	14,124	8,013
Level 1 [Member] | Investments of consolidated sponsored investment products [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	6,484	10,092
Level 1 [Member] | Equity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	4,729	4,379
Level 1 [Member] | Sponsored closed-end funds [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities available for sale	2,816	2,656
Level 1 [Member] | Nonqualified retirement plan assets [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other assets, nonqualified retirement plan assets	3,168	2,970
Level 2 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Total assets measured at fair value	30,164	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] | Investments of consolidated sponsored investment products [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading	30,164	33,135
Level 2 [Member] | Equity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading
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] | Investments of consolidated sponsored investment products [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading
Level 3 [Member] | Equity securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Marketable securities trading
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

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

+ Details

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

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 Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ 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=7534914&loc=d3e22054-111558



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

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

+ Details

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

X

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

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)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558



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

-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

+ Details

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