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Collateralized Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
Securities Financing Transaction [Line Items] |  |  |
Repurchase agreements | $ 512,000 |  |
Securities loaned | 2,973,000 | $ 13,902,000 |
CF & Co [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Repurchase agreements | $ 500,000 |  | $ 0
Repurchase agreements maturity date | Apr. 01, 2020 |  |
Securities loaned | $ 3,000,000.0 | $ 13,900,000 |
Stated interest rate | 0.58% | 2.45% |
CF & Co [Member] | Securities Financing Transaction, Fair Value [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Securities loaned | $ 2,800,000 | $ 13,900,000 |
CF & Co [Member] | Securities Financing Transaction, Fair Value [Member] | Fair Value [Member] |  |  |
Securities Financing Transaction [Line Items] |  |  |
Securities loaned | $ 2,800,000 | $ 13,900,000 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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