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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | $ 80,950 | $ 202,054
Other investments, nonqualified retirement plan assets | 4,970 | 5,063
Total assets measured at fair value | 126,056 | 257,368
Sponsored Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 30,538 | 38,312
Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 6,645 | 8,740
Sponsored Closed-End Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities available-for-sale | 2,953 | 3,199
Nonqualified Retirement Plan Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other investments, nonqualified retirement plan assets | 4,970 | 5,063
Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | 80,950 | 202,054
Total assets measured at fair value | 126,056 | 257,368
Level 1 [Member] | Sponsored Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 30,538 | 38,312
Level 1 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 6,645 | 8,740
Level 1 [Member] | Sponsored Closed-End Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities available-for-sale | 2,953 | 3,199
Level 1 [Member] | Nonqualified Retirement Plan Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other investments, nonqualified retirement plan assets | 4,970 | 5,063
Level 2 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 0 | 0
Level 2 [Member] | Sponsored Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 0 | 0
Level 2 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 0 | 0
Level 2 [Member] | Sponsored Closed-End Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities available-for-sale | 0 | 0
Level 2 [Member] | Nonqualified Retirement Plan Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other investments, nonqualified retirement plan assets | 0 | 0
Level 3 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 0 | 0
Level 3 [Member] | Sponsored Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 0 | 0
Level 3 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 0 | 0
Level 3 [Member] | Sponsored Closed-End Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities available-for-sale | 0 | 0
Level 3 [Member] | Nonqualified Retirement Plan Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other investments, nonqualified retirement plan assets | $ 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=36462937&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=51813488&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=49167202&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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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