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Significant Accounting Policies - Summary of Reclassifications Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Net cash provided by operating activities | $ 50,109 | $ 32,129
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Net Cash Provided by (Used in) Investing Activities | (92,467) | 11,954
Purchase of securities owned, a fair value | 97,570 | 34,683
Proceeds from the sale of securities owned, at fair value | $ 10,976 | 18,122
Reclassification from Cash Flow Operating Activities To Investing Activities [Member] |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Net cash provided by operating activities |  | 32,129
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Net Cash Provided by (Used in) Investing Activities |  | 11,954
Previously Reported [Member] | Reclassification from Cash Flow Operating Activities To Investing Activities [Member] |  |
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |
Net cash provided by operating activities |  | 15,568
Reclassification of net cash flows from securities purchases and sales |  | 16,561
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |
Net Cash Provided by (Used in) Investing Activities |  | 28,515
Purchase of securities owned, a fair value |  | (34,683)
Proceeds from the sale of securities owned, at fair value |  | $ 18,122

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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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- Definition Amount of cash outflow to acquire investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as investing activity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=123583714&loc=SL75117360-209713 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3444-108585 + Details
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