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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 |  |

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- 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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- 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 + Details
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- 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 + Details
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- 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. + Details
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