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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 | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total assets measured at fair value | $ 67,213 | $ 61,245
Sponsored mutual funds and variable insurance funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 13,371 | 8,013
Investments of consolidated sponsored investment products [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 43,114 | 43,227
Equity securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 4,649 | 4,379
Sponsored closed-end funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities available for sale | 2,713 | 2,656
Nonqualified retirement plan assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other assets, nonqualified retirement plan assets | 3,366 | 2,970
Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total assets measured at fair value | 37,748 | 28,110
Level 1 [Member] | Sponsored mutual funds and variable insurance funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 13,371 | 8,013
Level 1 [Member] | Investments of consolidated sponsored investment products [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 13,649 | 10,092
Level 1 [Member] | Equity securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 4,649 | 4,379
Level 1 [Member] | Sponsored closed-end funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities available for sale | 2,713 | 2,656
Level 1 [Member] | Nonqualified retirement plan assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other assets, nonqualified retirement plan assets | 3,366 | 2,970
Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Total assets measured at fair value | 29,465 | 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 | 29,465 | 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 |  |

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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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