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Fair Value Measurements - Changes in Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | $ 72,993 | $ 48,620
Other Investments [Abstract] |  |
Total assets measured at fair value | 169,462 | 129,335
Sponsored funds |  |
Marketable securities trading: |  |
Marketable securities trading | 46,849 | 60,019
Equity securities |  |
Marketable securities trading: |  |
Marketable securities trading | 15,810 | 11,473
Sponsored closed-end funds |  |
Marketable securities available-for-sale: |  |
Marketable securities available for sale | 3,765 | 3,415
Collateralized loan obligations |  |
Other Investments [Abstract] |  |
Investments in collateralized loan obligations | 23,339 |
Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Other investments | 6,706 | 5,808
Level 1 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | 72,993 | 48,620
Other Investments [Abstract] |  |
Total assets measured at fair value | 146,123 | 129,335
Level 1 | Sponsored funds |  |
Marketable securities trading: |  |
Marketable securities trading | 46,849 | 60,019
Level 1 | Equity securities |  |
Marketable securities trading: |  |
Marketable securities trading | 15,810 | 11,473
Level 1 | Sponsored closed-end funds |  |
Marketable securities available-for-sale: |  |
Marketable securities available for sale | 3,765 | 3,415
Level 1 | Collateralized loan obligations |  |
Other Investments [Abstract] |  |
Investments in collateralized loan obligations | 0 |
Level 1 | Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Other investments | 6,706 | 5,808
Level 2 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | 0 | 0
Other Investments [Abstract] |  |
Total assets measured at fair value | 18,900 | 0
Level 2 | Sponsored funds |  |
Marketable securities trading: |  |
Marketable securities trading | 0 | 0
Level 2 | Equity securities |  |
Marketable securities trading: |  |
Marketable securities trading | 0 | 0
Level 2 | Sponsored closed-end funds |  |
Marketable securities available-for-sale: |  |
Marketable securities available for sale | 0 | 0
Level 2 | Collateralized loan obligations |  |
Other Investments [Abstract] |  |
Investments in collateralized loan obligations | 18,900 |
Level 2 | Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Other investments | 0 | 0
Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | 0 | 0
Other Investments [Abstract] |  |
Total assets measured at fair value | 4,439 | 0
Level 3 | Sponsored funds |  |
Marketable securities trading: |  |
Marketable securities trading | 0 | 0
Level 3 | Equity securities |  |
Marketable securities trading: |  |
Marketable securities trading | 0 | 0
Level 3 | Sponsored closed-end funds |  |
Marketable securities available-for-sale: |  |
Marketable securities available for sale | 0 | 0
Level 3 | Collateralized loan obligations |  |
Other Investments [Abstract] |  |
Investments in collateralized loan obligations | 4,439 |
Level 3 | Nonqualified retirement plan assets |  |
Other Investments [Abstract] |  |
Other investments | $ 0 | $ 0

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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=66048111&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=75030427&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=82897076&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=82896770&loc=d3e26610-111562 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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