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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | $ 121,552 | $ 54,772
Total assets measured at fair value | 207,216 | 101,578
Sponsored Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 66,465 | 29,331
Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 10,200 | 9,168
Sponsored Closed-End Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities available-for-sale | 3,569 | 2,997
Nonqualified Retirement Plan Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other investments, nonqualified retirement plan assets | 5,430 | 5,310
Level 1 [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cash equivalents | 121,552 | 54,772
Total assets measured at fair value | 207,216 | 101,578
Level 1 [Member] | Sponsored Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 66,465 | 29,331
Level 1 [Member] | Equity Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities trading | 10,200 | 9,168
Level 1 [Member] | Sponsored Closed-End Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Marketable securities available-for-sale | 3,569 | 2,997
Level 1 [Member] | Nonqualified Retirement Plan Assets [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Other investments, nonqualified retirement plan assets | 5,430 | 5,310
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=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=65884222&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=73527792&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=66010992&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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- 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 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: 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 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=66010992&loc=d3e26610-111562 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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