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Collateralized Transactions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Securities Financing Transaction [Line Items] |  |
Repurchase agreements | $ 4,327 | $ 986
Securities loaned | 25,068 | 15,140
CF & Co [Member] |  |
Securities Financing Transaction [Line Items] |  |
Repurchase agreements | $ 4,300 | 1,000
Repurchase agreements maturity date | Apr. 01, 2019 |
Securities loaned | $ 25,100 | $ 15,100
Stated interest rate |  | 2.90%
CF & Co [Member] | Securities Financing Transaction, Fair Value [Member] |  |
Securities Financing Transaction [Line Items] |  |
Securities loaned | 25,300 | $ 15,300
CF & Co [Member] | Securities Financing Transaction, Fair Value [Member] | Fair Value [Member] |  |
Securities Financing Transaction [Line Items] |  |
Securities loaned | $ 25,300 | $ 15,300
CF & Co [Member] | Minimum [Member] |  |
Securities Financing Transaction [Line Items] |  |
Stated interest rate | 2.95% |
CF & Co [Member] | Maximum [Member] |  |
Securities Financing Transaction [Line Items] |  |
Stated interest rate | 3.25% |

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