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Consolidation - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Cash equivalents | $ 72,993 | $ 48,620
Total assets measured at fair value | 169,462 | 129,335
Level 1 |  |
Assets |  |
Cash equivalents | 72,993 | 48,620
Total assets measured at fair value | 146,123 | 129,335
Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 18,900 | 0
Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
Total assets measured at fair value | 4,439 | 0
Consolidated investment products | Fair Value, Measurements, Recurring |  |
Assets |  |
Cash equivalents | 82,769 | 14,449
Derivatives |  | 4
Total assets measured at fair value | 1,680,521 | 503,495
Liabilities |  |
Notes payable | 1,457,435 | 328,761
Derivatives | 2 | 300
Short sales | 719 | 649
Total liabilities measured at fair value | 1,458,156 | 329,710
Consolidated investment products | Fair Value, Measurements, Recurring | Debt investments |  |
Assets |  |
Investments and bank loans | 1,561,732 | 448,564
Consolidated investment products | Fair Value, Measurements, Recurring | Equity securities |  |
Assets |  |
Investments and bank loans | 36,020 | 40,478
Consolidated investment products | Fair Value, Measurements, Recurring | Level 1 |  |
Assets |  |
Cash equivalents | 82,769 | 14,449
Derivatives |  | 4
Total assets measured at fair value | 117,895 | 54,723
Liabilities |  |
Notes payable | 0 | 0
Derivatives | 2 | 3
Short sales | 719 | 649
Total liabilities measured at fair value | 721 | 652
Consolidated investment products | Fair Value, Measurements, Recurring | Level 1 | Debt investments |  |
Assets |  |
Investments and bank loans | 0 | 0
Consolidated investment products | Fair Value, Measurements, Recurring | Level 1 | Equity securities |  |
Assets |  |
Investments and bank loans | 35,126 | 40,270
Consolidated investment products | Fair Value, Measurements, Recurring | Level 2 |  |
Assets |  |
Cash equivalents | 0 | 0
Derivatives |  | 0
Total assets measured at fair value | 1,527,845 | 448,685
Liabilities |  |
Notes payable | 1,457,435 | 328,761
Derivatives | 0 | 235
Short sales | 0 | 0
Total liabilities measured at fair value | 1,457,435 | 328,996
Consolidated investment products | Fair Value, Measurements, Recurring | Level 2 | Debt investments |  |
Assets |  |
Investments and bank loans | 1,527,845 | 448,477
Consolidated investment products | Fair Value, Measurements, Recurring | Level 2 | Equity securities |  |
Assets |  |
Investments and bank loans | 0 | 208
Consolidated investment products | Fair Value, Measurements, Recurring | Level 3 |  |
Assets |  |
Cash equivalents | 0 | 0
Derivatives |  | 0
Total assets measured at fair value | 34,781 | 87
Liabilities |  |
Notes payable | 0 | 0
Derivatives | 0 | 62
Short sales | 0 | 0
Total liabilities measured at fair value | 0 | 62
Consolidated investment products | Fair Value, Measurements, Recurring | Level 3 | Debt investments |  |
Assets |  |
Investments and bank loans | 33,887 | 87
Consolidated investment products | Fair Value, Measurements, Recurring | Level 3 | Equity securities |  |
Assets |  |
Investments and bank loans | $ 894 | $ 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 No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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