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Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Cash equivalents | $ 223,087 | $ 48,620
Total assets measured at fair value | 299,868 | 129,335
Level 1 |  |
Assets |  |
Cash equivalents | 223,087 | 48,620
Total assets measured at fair value | 299,868 | 129,335
Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 0 | 0
Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 0 | 0
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring |  |
Assets |  |
Derivatives |  | 4
Total assets measured at fair value | 112,930 | 142,079
Liabilities |  |
Derivatives | 281 | 300
Short sales | 588 | 649
Total liabilities measured at fair value | 869 | 949
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Debt securities |  |
Assets |  |
Investments | 72,093 | 101,597
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Equity securities |  |
Assets |  |
Investments | 40,837 | 40,478
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 1 |  |
Assets |  |
Derivatives |  | 4
Total assets measured at fair value | 40,470 | 40,274
Liabilities |  |
Derivatives | 1 | 3
Short sales | 588 | 649
Total liabilities measured at fair value | 589 | 652
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 1 | Debt securities |  |
Assets |  |
Investments | 0 | 0
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 1 | Equity securities |  |
Assets |  |
Investments | 40,470 | 40,270
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Derivatives |  | 0
Total assets measured at fair value | 72,299 | 101,718
Liabilities |  |
Derivatives | 280 | 235
Short sales | 0 | 0
Total liabilities measured at fair value | 280 | 235
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 2 | Debt securities |  |
Assets |  |
Investments | 71,932 | 101,510
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 2 | Equity securities |  |
Assets |  |
Investments | 367 | 208
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Derivatives |  | 0
Total assets measured at fair value | 161 | 87
Liabilities |  |
Derivatives | 0 | 62
Short sales | 0 | 0
Total liabilities measured at fair value | 0 | 62
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 3 | Debt securities |  |
Assets |  |
Investments | 161 | 87
Consolidated Sponsored Investment Products | Fair Value, Measurements, Recurring | Level 3 | Equity securities |  |
Assets |  |
Investments | 0 | 0
Consolidated Investment Product | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents | 13,957 | 14,449
Investments | 354,002 | 346,967
Total assets measured at fair value | 367,959 | 361,416
Liabilities |  |
Notes payable | 325,843 | 328,761
Total liabilities measured at fair value | 325,843 | 328,761
Consolidated Investment Product | Fair Value, Measurements, Recurring | Level 1 |  |
Assets |  |
Cash equivalents | 13,957 | 14,449
Investments | 0 | 0
Total assets measured at fair value | 13,957 | 14,449
Liabilities |  |
Notes payable | 0 | 0
Total liabilities measured at fair value | 0 | 0
Consolidated Investment Product | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Investments | 352,440 | 346,967
Total assets measured at fair value | 352,440 | 346,967
Liabilities |  |
Notes payable | 325,843 | 328,761
Total liabilities measured at fair value | 325,843 | 328,761
Consolidated Investment Product | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
Investments | 1,562 | 0
Total assets measured at fair value | 1,562 | 0
Liabilities |  |
Notes payable | 0 | 0
Total liabilities measured at fair value | $ 0 | $ 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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