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Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2011 Total Estimated Fair Value as of Acquisition Date (provisional) [Member]	May 31, 2011 Measurement Period Adjustments [Member]	May 31, 2011 Estimated Fair Value as of Acquisition Date (final) [Member]	Dec. 31, 2011 JVB Holdings [Member]	Jan. 31, 2011 JVB Holdings [Member]	Dec. 31, 2010 JVB Holdings [Member] Total Estimated Fair Value as of Acquisition Date (provisional) [Member]	Dec. 31, 2012 PrinceRidge [Member]	Dec. 31, 2011 PrinceRidge [Member]	May 31, 2011 PrinceRidge [Member]	May 31, 2011 PrinceRidge [Member] Total Estimated Fair Value as of Acquisition Date (provisional) [Member]	May 31, 2011 PrinceRidge [Member] Measurement Period Adjustments [Member]	May 31, 2011 PrinceRidge [Member] Estimated Fair Value as of Acquisition Date (final) [Member]
Assets acquired:
Cash and cash equivalents						$ 91				$ 2,149		$ 2,149
Receivables from brokers, dealers and clearing agencies (deposits with clearing organizations)						100				9,382		9,382
Investments-trading						31,935				42,407		42,407
Other assets						1,077				4,730		4,730
Other receivables										1,815		1,815
Receivables under resale agreements										158,688		158,688
Liabilities assumed:
Payables to brokers, dealers, and clearing agencies						(17,655)
Accounts payable and other liabilities						(1,221)				(2,877)		(2,877)
Trading securities sold, not yet purchased						(4,497)				(38,605)		(38,605)
Fair value of net assets acquired	17,344		17,344			9,830			17,344	17,344		17,344
Accrued compensation										(1,725)		(1,725)
Securities sold under agreement to repurchase										(158,620)		(158,620)
Purchase price	18,502	(93)	18,409		16,813	16,813			18,409	18,502	(93)	18,409
Goodwill				6,983		6,983	899	992		992	(93)	899
Excess of purchase price over net fair value									1,065	1,158	(93)	1,065
Less amount allocated to intangible asset										$ (166)		$ (166)

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Amount of acquisition cost of a business combination allocated to receivables from brokers, dealers and clearing agencies.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

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The amount of cash and cash equivalents acquired in a business combination.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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