Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Geographic Information and Business Segments - Segments(Details) $ in Thousands	3 Months Ended		7 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) segment	Sep. 30, 2016 USD ($)	Jul. 19, 2017 item	Jul. 19, 2017 segment	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment reporting
Number of businesses Company is managed and operated as			1	1
Number of reportable segments \| segment				1
Number of operating segments \| segment	3
Revenues	$ 271,286	$ 164,806			$ 563,461	$ 531,625
Pre-tax earnings	(46,495)	37,874			(17,421)	140,990
Total assets	7,739,345				7,739,345		$ 3,692,390
Market Making
Segment reporting
Revenues	228,582	161,977			514,823	524,503
Pre-tax earnings	(19,322)	36,888			17,241	138,572
Execution Services
Segment reporting
Revenues	39,077	2,931			44,964	7,224
Pre-tax earnings	(6,017)	1,608			(4,913)	3,196
Corporate
Segment reporting
Revenues	3,627	(102)			3,674	(102)
Pre-tax earnings	$ (21,156)	$ (622)			$ (29,749)	$ (778)