Fair Value - Valuation of Financial Instruments by Pricing Observability Levels (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Trading
Investments, NAV Expedient	$ 37,200
Investments, Other Measurements	54,229	$ 118,149
Securities sold not yet purchased
Contingent payment arrangements	0	11,893	$ 0
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure [Abstract]
Money markets	62,071	107,250
Securities segregated (U.S. Treasury Bills)	816,350	893,189
Derivatives	11,619	8,413
Trading
Private equity	38,186	45,278
Investments, NAV Expedient	37,326	40,413
Available-for-sale	99	45
Total investments measured at fair value and other measurements	443,589	441,105
Assets, Fair Value Disclosure and Other Measurements	1,333,629	1,449,957
Securities sold not yet purchased
Short equities – corporate	16,376	40,252
Short exchange-traded options	13,585	692
Derivatives	14,323	8,649
Contingent payment arrangements	10,855	17,589
Total liabilities measured at fair value	55,139	67,182
Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Assets, Fair Value Disclosure [Abstract]
Money markets	62,071	107,250
Securities segregated (U.S. Treasury Bills)		0
Derivatives	948	1,224
Trading
Private equity	0	0
Available-for-sale	99	45
Total investments	287,162	231,752
Total assets measured at fair value	350,181	340,226
Securities sold not yet purchased
Short equities – corporate	16,376	40,252
Short exchange-traded options	13,585	692
Derivatives	2,540	1,092
Contingent payment arrangements	0	0
Total liabilities measured at fair value	32,501	42,036
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Assets, Fair Value Disclosure [Abstract]
Money markets	0	0
Securities segregated (U.S. Treasury Bills)	816,350	893,189
Derivatives	10,671	7,189
Trading
Private equity	0	0
Available-for-sale	0	0
Total investments	63,801	45,768
Total assets measured at fair value	890,822	946,146
Securities sold not yet purchased
Short equities – corporate	0	0
Short exchange-traded options	0	0
Derivatives	11,783	7,557
Contingent payment arrangements	0	0
Total liabilities measured at fair value	11,783	7,557
Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Assets, Fair Value Disclosure [Abstract]
Money markets	0	0
Securities segregated (U.S. Treasury Bills)	0	0
Derivatives	0	0
Trading
Private equity	954	4,913
Available-for-sale	0	0
Total investments	1,071	5,023
Total assets measured at fair value	1,071	5,023
Securities sold not yet purchased
Short equities – corporate	0	0
Short exchange-traded options	0	0
Derivatives	0	0
Contingent payment arrangements	10,855	17,589
Total liabilities measured at fair value	10,855	17,589
US Treasury Bills [Member] \| Fair Value, Measurements, Recurring [Member]
Trading
Trading securities	52,609	28,937
US Treasury Bills [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Trading
Trading securities	0	0
US Treasury Bills [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Trading
Trading securities	52,609	28,937
US Treasury Bills [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Trading
Trading securities	0	0
Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Trading
Trading securities	209,114	153,998
Investments, NAV Expedient	81	36
Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Trading
Trading securities	208,910	148,128
Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Trading
Trading securities	6	5,724
Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Trading
Trading securities	117	110
Fixed Income Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Trading
Trading securities	84,371	91,592
Investments, NAV Expedient	13	12
Fixed Income Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Trading
Trading securities	73,172	80,473
Fixed Income Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Trading
Trading securities	11,186	11,107
Fixed Income Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Trading
Trading securities	0	0
Private Equity Funds [Member] \| Fair Value, Measurements, Recurring [Member]
Trading
Investments, NAV Expedient	37,232	40,365
Other Investments [Member]
Trading
Investments, Other Measurements	11,892	7,522
Other Investments [Member] \| Fair Value, Measurements, Recurring [Member]
Trading
Investments, Other Measurements	11,892	7,522
Long [Member] \| Exchange Traded Options [Member] \| Fair Value, Measurements, Recurring [Member]
Trading
Trading securities	4,981	3,106
Long [Member] \| Exchange Traded Options [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Trading
Trading securities	4,981	3,106
Long [Member] \| Exchange Traded Options [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Trading
Trading securities	0	0
Long [Member] \| Exchange Traded Options [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 3 [Member]
Trading
Trading securities	0	0
Limited Partnership Hedge Funds [Member]
Trading
Investments, Other Measurements	37,199	40,530
Limited Partnership Hedge Funds [Member] \| Fair Value, Measurements, Recurring [Member]
Trading
Investments, Other Measurements	37,199	40,530
Time Deposits [Member]
Trading
Investments, Other Measurements	5,138	70,097
Time Deposits [Member] \| Fair Value, Measurements, Recurring [Member]
Trading
Investments, Other Measurements	$ 5,138	$ 70,097

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of liability recognized arising from contingent consideration in a business combination.

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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.

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Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

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The fair value as of the balance sheet date of firm holdings in private equity, mezzanine, venture capital, merchant banking, real estate and special situations investments. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Fair value of obligations arising from derivatives and other contracts sold short.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of financial and nonfinancial obligations.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities.

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Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

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