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Collateralized Transactions - Additional Information (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Securities Financing Transaction [Line Items]
Repurchase agreements	$ 985,000
Securities loaned	92,565,000	$ 202,343,000
Minimum [Member]
Securities Financing Transaction [Line Items]
Financial covenants including maintaining minimum cash and cash equivalents	15,000,000
CF & Co [Member]
Securities Financing Transaction [Line Items]
Repurchase agreements	1,000,000	0
Securities loaned	92,600,000	202,300,000
CF & Co [Member] | Securities Financing Transaction, Fair Value [Member]
Securities Financing Transaction [Line Items]
Securities loaned	$ 94,600,000	$ 204,100,000
CF & Co [Member] | Minimum [Member]
Securities Financing Transaction [Line Items]
Stated interest rate	2.20%	1.90%
CF & Co [Member] | Maximum [Member]
Securities Financing Transaction [Line Items]
Stated interest rate	2.50%	4.30%

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

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Amount, after the effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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