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Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Cash equivalents | $ 121,552 | $ 54,772
Total assets measured at fair value | 207,216 | 101,578
Level 1 [Member] |  |
Assets |  |
Cash equivalents | 121,552 | 54,772
Total assets measured at fair value | 207,216 | 101,578
Level 2 [Member] |  |
Assets |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 0 | 0
Level 3 [Member] |  |
Assets |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 0 | 0
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Derivatives | 0 | 771
Total assets measured at fair value | 130,396 | 324,106
Liabilities |  |
Derivatives | 136 | 972
Short sales | 715 | 5,409
Total liabilities measured at fair value | 851 | 6,381
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Debt Securities [Member] |  |
Assets |  |
Investments | 95,085 | 152,553
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Equity Securities [Member] |  |
Assets |  |
Investments | 35,311 | 170,782
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets |  |
Derivatives | 0 | 33
Total assets measured at fair value | 26,931 | 163,019
Liabilities |  |
Derivatives | 0 | 128
Short sales | 715 | 5,334
Total liabilities measured at fair value | 715 | 5,462
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Debt Securities [Member] |  |
Assets |  |
Investments | 0 | 0
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity Securities [Member] |  |
Assets |  |
Investments | 26,931 | 162,986
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets |  |
Derivatives | 0 | 738
Total assets measured at fair value | 103,376 | 159,690
Liabilities |  |
Derivatives | 136 | 844
Short sales | 0 | 75
Total liabilities measured at fair value | 136 | 919
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Debt Securities [Member] |  |
Assets |  |
Investments | 94,996 | 151,156
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity Securities [Member] |  |
Assets |  |
Investments | 8,380 | 7,796
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets |  |
Derivatives | 0 | 0
Total assets measured at fair value | 89 | 1,397
Liabilities |  |
Derivatives | 0 | 0
Short sales | 0 | 0
Total liabilities measured at fair value | 0 | 0
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Debt Securities [Member] |  |
Assets |  |
Investments | 89 | 1,397
Consolidated Sponsored Investment Products [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity Securities [Member] |  |
Assets |  |
Investments | 0 | 0
Consolidated Investment Product [Member] |  |
Liabilities |  |
Notes payable of consolidated investment product | 319,716 | 0
Consolidated Investment Product [Member] | Fair Value, Measurements, Recurring [Member] |  |
Assets |  |
Cash equivalents | 91,044 | 8,297
Investments | 344,886 | 199,485
Total assets measured at fair value | 435,930 | 207,782
Liabilities |  |
Notes payable | 319,716 |
Total liabilities measured at fair value | 319,716 |
Consolidated Investment Product [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets |  |
Cash equivalents | 91,044 | 8,297
Investments | 0 | 0
Total assets measured at fair value | 91,044 | 8,297
Liabilities |  |
Notes payable | 0 |
Total liabilities measured at fair value | 0 |
Consolidated Investment Product [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets |  |
Cash equivalents | 0 | 0
Investments | 344,886 | 199,485
Total assets measured at fair value | 344,886 | 199,485
Liabilities |  |
Total liabilities measured at fair value | 319,716 |
Consolidated Investment Product [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets |  |
Cash equivalents | 0 | 0
Investments | 0 | 0
Total assets measured at fair value | 0 | $ 0
Liabilities |  |
Notes payable | 0 |
Total liabilities measured at fair value | $ 0 |

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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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