Virtu Financial (VIRT) 10-Q 9 Aug 19 2019 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2019	Aug. 09, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-37352
Entity Registrant Name	Virtu Financial, Inc.
Entity Central Index Key	0001592386
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	32-0420206
Entity Address, Address Line One	One Liberty Plaza165 Broadway
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10006
City Area Code	212
Local Phone Number	418-0100
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Class A common stock, par value $0.00001 per share
Trading Symbol	VIRT
Security Exchange Name	NASDAQ
Class A
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		117,380,768
Class C
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		13,138,402
Class D
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		60,091,740

Condensed Consolidated Statemen

Condensed Consolidated Statements of Financial Condition (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 458,064	$ 729,547
Cash restricted or segregated under regulations and other	39,497	6,500
Securities borrowed	1,201,327	1,399,684
Securities purchased under agreements to resell	22,974	15,475
Receivables from broker-dealers and clearing organizations	1,287,091	1,101,449
Trading assets, at fair value:
Financial instruments owned	2,435,001	1,848,806
Financial instruments owned and pledged	670,001	791,115
Receivables from customers	254,650	0
Property, equipment and capitalized software (net of accumulated depreciation of $481,871 and $323,718 as of June 30, 2019 and December 31, 2018, respectively)	117,899	113,322
Operating lease right-of-use assets	318,269	0
Goodwill	1,196,548	836,583
Intangibles (net of accumulated amortization of $180,172 and $148,644 as of June 30, 2019 and December 31, 2018, respectively)	532,061	83,989
Deferred tax assets	252,229	200,359
Other assets ($49,199 and $48,273, at fair value, as of June 30, 2019 and December 31, 2018, respectively)	295,786	254,149
Total assets	9,081,397	7,380,978
Liabilities
Short-term borrowings	146,847	15,128
Securities loaned	778,351	1,130,039
Securities sold under agreements to repurchase	295,803	281,861
Payables to broker-dealers and clearing organizations	668,545	567,441
Payables to customers	131,303	0
Trading liabilities, at fair value:
Financial instruments sold, not yet purchased	2,716,418	2,475,395
Tax receivable agreement obligations	256,700	214,403
Deferred tax liabilities	65,848	0
Accounts payable, accrued expenses and other liabilities	349,832	294,975
Operating lease liabilities	388,070	0
Long-term borrowings	1,931,811	907,037
Total liabilities	7,729,528	5,886,279
Commitments and Contingencies (Note 15)
Virtu Financial Inc. Stockholders' equity
Treasury stock, at cost, 2,178,771 and 2,178,771 shares at June 30, 2019 and December 31, 2018, respectively	(55,005)	(55,005)
Additional paid-in capital	1,057,587	1,010,468
Retained earnings	(5,949)	96,513
Accumulated other comprehensive income (loss)	(1,670)	(82)
Total Virtu Financial Inc. stockholders' equity	994,965	1,051,896
Noncontrolling interest	356,904	442,803
Total equity	1,351,869	1,494,699
Total liabilities and equity	9,081,397	7,380,978
Class A
Virtu Financial Inc. Stockholders' equity
Common stock (par value $0.00001)	1	1
Class B
Virtu Financial Inc. Stockholders' equity
Common stock (par value $0.00001)	0	0
Class C
Virtu Financial Inc. Stockholders' equity
Common stock (par value $0.00001)	0	0
Class D
Virtu Financial Inc. Stockholders' equity
Common stock (par value $0.00001)	$ 1	$ 1

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accumulated depreciation	$ 481,871	$ 323,718
Intangibles, accumulated amortization	180,172	148,644
Fair value of other assets	$ 49,199	$ 48,273
Treasury stock, shares (in shares)	2,178,771	2,178,771
Class A
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	119,491,416	108,955,048
Common stock, shares outstanding (in shares)	117,312,645	106,776,277
Class B
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	175,000,000	175,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0
Class C
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, shares issued (in shares)	13,138,402	13,749,886
Common stock, shares outstanding (in shares)	13,138,402	13,749,886
Class D
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	175,000,000	175,000,000
Common stock, shares issued (in shares)	60,091,740	69,091,740
Common stock, shares outstanding (in shares)	60,091,740	69,091,740

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Trading income, net	$ 205,923	$ 258,593	$ 463,463	$ 664,755
Interest and dividends income	24,162	21,937	53,293	39,886
Commissions, net and technology services	145,120	46,565	220,267	100,409
Total revenue	378,456	328,126	741,448	1,143,179
Operating Expenses:
Brokerage, exchange and clearance fees, net	75,851	73,318	139,904	161,141
Communication and data processing	54,423	48,791	96,237	98,277
Employee compensation and payroll taxes	83,702	41,226	191,540	105,896
Payments for order flow	23,636	15,842	47,197	32,098
Interest and dividends expense	36,824	35,009	82,193	68,633
Operations and administrative	34,808	16,610	56,885	36,416
Depreciation and amortization	14,810	16,194	31,260	31,546
Amortization of purchased intangibles and acquired capitalized software	20,606	6,838	31,528	13,675
Termination of office leases	65,207	1,777	65,208	21,860
Debt issue cost related to debt refinancing and prepayment	(1,319)	2,359	7,894	8,380
Transaction advisory fees and expenses	1,798	1,750	16,907	9,246
Charges related to share based compensation at IPO	0	10	0	24
Financing interest expense on long-term borrowings	34,689	18,780	57,478	37,827
Total operating expenses	445,035	278,504	824,231	625,019
Income (loss) before income taxes and noncontrolling interest	(66,579)	49,622	(82,783)	518,160
Provision for (benefit from) income taxes	(11,094)	3,000	(13,679)	61,515
Net income (loss)	(55,485)	46,622	(69,104)	456,645
Noncontrolling interest	25,594	(21,413)	32,540	(256,684)
Net income (loss) available for common stockholders	$ (29,891)	$ 25,209	$ (36,564)	$ 199,961
Earnings (loss) per share
Basic (in dollars per share)	$ (0.27)	$ 0.25	$ (0.34)	$ 2.06
Diluted (in dollars per share)	$ (0.27)	$ 0.24	$ (0.34)	$ 2.02
Weighted average common shares outstanding
Basic (in shares)	112,828,240	99,542,659	110,076,375	95,124,675
Diluted (in shares)	112,828,240	101,619,651	110,076,375	97,155,104
Comprehensive income
Net income (loss)	$ (55,485)	$ 46,622	$ (69,104)	$ 456,645
Other comprehensive income (loss)
Foreign exchange translation adjustment, net of taxes	884	(5,576)	(2,860)	(3,047)
Comprehensive income (loss)	(54,601)	41,046	(71,964)	453,598
Less: Comprehensive income (loss) attributable to noncontrolling interest	25,258	(18,972)	33,812	(255,531)
Comprehensive income (loss) attributable to common stockholders	(29,343)	22,074	(38,152)	198,067
Other, net
Revenues:
Total revenue	$ 3,251	$ 1,031	$ 4,425	$ 338,129

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)	Total	Common StockClass A	Common StockClass C	Common StockClass D	Treasury Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Total Virtu Financial Inc. Stockholders' Equity	Non-Controlling Interest
Balance at beginning period (in shares) at Dec. 31, 2017		90,415,532	17,880,239	79,610,490	(616,923)
Balance at beginning of period at Dec. 31, 2017	$ 1,151,578,000	$ 1,000	$ 0	$ 1,000	$ (11,041,000)	$ 900,746,000	$ (62,129,000)	$ 2,991,000	$ 830,569,000	$ 321,009,000
Increase (decrease) in stockholder's/members' equity
Share based compensation (in shares)		744,536
Share based compensation	16,632,000					16,632,000			16,632,000
Repurchase of Class C common stock (in shares)			(18,154)
Repurchase of Class C common stock	(332,000)					(332,000)			(332,000)
Treasury stock purchases (in shares)					(558,084)
Treasury stock purchases	(14,444,000)				$ (14,444,000)				(14,444,000)
Stock option exercised (in shares)		732,000
Stock options exercised	13,908,000					13,908,000			13,908,000
Net income (loss)	410,022,000						174,751,000		174,751,000	235,271,000
Foreign exchange translation adjustment	2,529,000							1,241,000	1,241,000	1,288,000
Distribution from Virtu Financial to non-controlling interest	(99,038,000)									(99,038,000)
Dividends	(22,380,000)						(22,380,000)		(22,380,000)
Issuance of common stock in connection with employee exchanges (in shares)		795,521
Repurchase of Virtu Financial Units and corresponding number of Class C common stock in connection with employee exchanges (in shares)			(795,521)
Balance at end of period (in shares) at Mar. 31, 2018		92,687,589	17,066,564	79,610,490	(1,175,007)
Balance at end of period at Mar. 31, 2018	1,458,475,000	$ 1,000	$ 0	$ 1,000	$ (25,485,000)	930,954,000	90,242,000	4,232,000	999,945,000	458,530,000
Balance at beginning period (in shares) at Dec. 31, 2017		90,415,532	17,880,239	79,610,490	(616,923)
Balance at beginning of period at Dec. 31, 2017	1,151,578,000	$ 1,000	$ 0	$ 1,000	$ (11,041,000)	900,746,000	(62,129,000)	2,991,000	830,569,000	321,009,000
Increase (decrease) in stockholder's/members' equity
Net income (loss)	456,645,000
Foreign exchange translation adjustment	(3,047,000)
Balance at end of period (in shares) at Jun. 30, 2018		109,086,092	14,331,267	69,091,740	(2,178,771)
Balance at end of period at Jun. 30, 2018	1,441,626,000	$ 1,000	$ 0	$ 1,000	$ (55,005,000)	995,084,000	89,521,000	1,097,000	1,030,699,000	410,927,000
Balance at beginning period (in shares) at Mar. 31, 2018		92,687,589	17,066,564	79,610,490	(1,175,007)
Balance at beginning of period at Mar. 31, 2018	1,458,475,000	$ 1,000	$ 0	$ 1,000	$ (25,485,000)	930,954,000	90,242,000	4,232,000	999,945,000	458,530,000
Increase (decrease) in stockholder's/members' equity
Share based compensation (in shares)		(150,000)
Share based compensation	6,011,000					6,011,000			6,011,000
Repurchase of Class C common stock (in shares)			(22,601)
Repurchase of Class C common stock	(756,000)					(756,000)			(756,000)
Treasury stock purchases (in shares)					(1,003,764)
Treasury stock purchases	(29,520,000)				$ (29,520,000)				(29,520,000)
Stock option exercised (in shares)		3,317,057
Stock options exercised	63,024,000					63,024,000			63,024,000
Net income (loss)	46,622,000						25,209,000		25,209,000	21,413,000
Foreign exchange translation adjustment	(5,576,000)							(3,135,000)	(3,135,000)	(2,441,000)
Distribution from Virtu Financial to non-controlling interest	(66,575,000)									(66,575,000)
Dividends	(25,930,000)						(25,930,000)		(25,930,000)
Issuance of common stock in connection with employee exchanges (in shares)		2,712,696
Issuance of Common Stock in connection with secondary offering, net of offering costs (in shares)		10,518,750		(10,518,750)
Issuance of Common Stock in connection with secondary offering, net of offering costs	(710,000)					(710,000)			(710,000)
Repurchase of Virtu Financial Units and corresponding number of Class C common stock in connection with employee exchanges (in shares)			(2,712,696)
Issuance of tax receivable agreements in connection with employee exchange	(3,439,000)					(3,439,000)			(3,439,000)
Balance at end of period (in shares) at Jun. 30, 2018		109,086,092	14,331,267	69,091,740	(2,178,771)
Balance at end of period at Jun. 30, 2018	1,441,626,000	$ 1,000	$ 0	$ 1,000	$ (55,005,000)	995,084,000	89,521,000	1,097,000	1,030,699,000	410,927,000
Balance at beginning period (in shares) at Dec. 31, 2018		108,955,048	13,749,886	69,091,740	(2,178,771)
Balance at beginning of period at Dec. 31, 2018	1,494,699,000	$ 1,000	$ 0	$ 1,000	$ (55,005,000)	1,010,468,000	96,513,000	(82,000)	1,051,896,000	442,803,000
Increase (decrease) in stockholder's/members' equity
Share based compensation (in shares)		965,421	0
Share based compensation	30,764,000					30,764,000			30,764,000
Repurchase of Class C common stock	0
Treasury stock purchases (in shares)		(325,195)
Treasury stock purchases	(8,805,000)						(8,805,000)		(8,805,000)
Stock option exercised (in shares)		86,224
Stock options exercised	859,000					859,000			859,000
Net income (loss)	(13,619,000)						(6,673,000)		(6,673,000)	(6,946,000)
Foreign exchange translation adjustment	(3,744,000)							(2,136,000)	(2,136,000)	(1,608,000)
Distribution from Virtu Financial to non-controlling interest	(37,196,000)									(37,196,000)
Dividends	(26,312,000)						(26,312,000)		(26,312,000)
Issuance of common stock in connection with employee exchanges (in shares)		240,000
Repurchase of Virtu Financial Units and corresponding number of Class C common stock in connection with employee exchanges (in shares)			(240,000)
Balance at end of period (in shares) at Mar. 31, 2019		109,921,498	13,509,886	69,091,740	(2,178,771)
Balance at end of period at Mar. 31, 2019	1,436,646,000	$ 1,000	$ 0	$ 1,000	$ (55,005,000)	1,042,091,000	54,723,000	(2,218,000)	1,039,593,000	397,053,000
Balance at beginning period (in shares) at Dec. 31, 2018		108,955,048	13,749,886	69,091,740	(2,178,771)
Balance at beginning of period at Dec. 31, 2018	1,494,699,000	$ 1,000	$ 0	$ 1,000	$ (55,005,000)	1,010,468,000	96,513,000	(82,000)	1,051,896,000	442,803,000
Increase (decrease) in stockholder's/members' equity
Net income (loss)	(69,104,000)
Foreign exchange translation adjustment	(2,860,000)
Balance at end of period (in shares) at Jun. 30, 2019		119,491,416	13,138,402	60,091,740	(2,178,771)
Balance at end of period at Jun. 30, 2019	1,351,869,000	$ 1,000	$ 0	$ 1,000	$ (55,005,000)	1,057,587,000	(5,949,000)	(1,670,000)	994,965,000	356,904,000
Balance at beginning period (in shares) at Mar. 31, 2019		109,921,498	13,509,886	69,091,740	(2,178,771)
Balance at beginning of period at Mar. 31, 2019	1,436,646,000	$ 1,000	$ 0	$ 1,000	$ (55,005,000)	1,042,091,000	54,723,000	(2,218,000)	1,039,593,000	397,053,000
Increase (decrease) in stockholder's/members' equity
Share based compensation (in shares)		257,750
Share based compensation	16,443,000					16,443,000			16,443,000
Repurchase of Class C common stock (in shares)			(3,584)
Repurchase of Class C common stock	(96,000)						(96,000)		(96,000)
Treasury stock purchases (in shares)		(90,852)
Treasury stock purchases	(2,093,000)						(2,093,000)		(2,093,000)
Stock option exercised (in shares)		35,120
Stock options exercised	72,000					72,000			72,000
Net income (loss)	(55,485,000)						(29,891,000)		(29,891,000)	(25,594,000)
Foreign exchange translation adjustment	884,000							548,000	548,000	336,000
Distribution from Virtu Financial to non-controlling interest	(14,891,000)									(14,891,000)
Dividends	(28,592,000)						(28,592,000)		(28,592,000)
Issuance of common stock in connection with employee exchanges (in shares)		367,900
Issuance of Common Stock in connection with secondary offering, net of offering costs (in shares)		9,000,000
Issuance of Common Stock in connection with secondary offering, net of offering costs	(375,000)			$ (9,000,000)		(375,000)			(375,000)
Repurchase of Virtu Financial Units and corresponding number of Class C common stock in connection with employee exchanges (in shares)			(367,900)
Issuance of tax receivable agreements in connection with employee exchange	(644,000)					(644,000)			(644,000)
Balance at end of period (in shares) at Jun. 30, 2019		119,491,416	13,138,402	60,091,740	(2,178,771)
Balance at end of period at Jun. 30, 2019	$ 1,351,869,000	$ 1,000	$ 0	$ 1,000	$ (55,005,000)	$ 1,057,587,000	$ (5,949,000)	$ (1,670,000)	$ 994,965,000	$ 356,904,000

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income (loss)	$ (69,104)	$ 456,645
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	31,260	31,546
Amortization of purchased intangibles and acquired capitalized software	31,528	13,675
Debt issue cost related to debt refinancing and prepayment	7,894	8,380
Amortization of debt issuance costs and deferred financing fees	6,361	5,427
Termination of office leases	65,208	21,860
Share based compensation	37,289	14,751
Reserve for legal matters	0	400
Write-down of assets	0	2,697
Connectivity early termination	0	7,062
Deferred taxes	6,965	5,546
Gain on sale of businesses	0	(337,550)
Other	(636)	765
Changes in operating assets and liabilities:
Securities borrowed	211,539	254,000
Securities purchased under agreements to resell	(7,499)	(5,163)
Receivables from broker-dealers and clearing organizations	142,470	(79,904)
Trading assets, at fair value	(464,558)	(60,461)
Receivables from customers	(131,953)	0
Other assets	(5,804)	136,833
Securities loaned	(369,351)	34,156
Securities sold under agreements to repurchase	13,942	(110,882)
Payables to broker-dealers and clearing organizations	(50,939)	31,408
Payables to customers	14,884	0
Trading liabilities, at fair value	241,012	21,766
Accounts payable, accrued expenses and other liabilities	(87,833)	(142,660)
Net cash provided by (used in) operating activities	(377,325)	310,297
Cash flows from investing activities
Development of capitalized software	(16,628)	(12,891)
Acquisition of property and equipment	(9,175)	(13,593)
Proceeds from sale of BondPoint	0	400,192
ITG Acquisition, net of cash acquired, described in Note 3	(835,581)	0
Investment in joint ventures	(3,000)	0
Net cash provided by (used in) investing activities	(864,384)	373,708
Cash flows from financing activities
Distribution from Virtu Financial to non-controlling interest	(52,087)	(165,612)
Dividends	(54,904)	(48,311)
Repurchase of stock	(10,898)	(43,964)
Stock options exercised	931	76,932
Short-term borrowings, net	116,245	15,000
Proceeds from long-term borrowings	1,492,500	0
Repayment of long term borrowings	(450,000)	(384,846)
Debt issuance costs	(35,702)	(1,179)
Issuance of common stock in connection with secondary offering, net of offering costs	(375)	(710)
Net cash provided by (used in) financing activities	1,005,614	(553,778)
Effect of exchange rate changes on cash and cash equivalents	(2,391)	(3,047)
Net increase (decrease) in cash and cash equivalents	(238,486)	127,180
Cash and cash equivalents beginning of period	736,047	532,887
Cash and cash equivalents, end of period	497,561	660,067
Supplementary disclosure of cash flow information
Cash paid for interest	90,726	65,063
Cash paid for taxes	1,746	77,021
Non-cash investing activities
Share based compensation to developers relating to capitalized software	1,441	1,325
Non-cash financing activities
Tax receivable agreement described in Note 6	(644)	(3,439)
Class C common stock
Cash flows from financing activities
Repurchase of stock	$ (96)	$ (1,088)

Organization and Basis of Prese

Organization and Basis of Presentation	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	Organization and Basis of Presentation Organization The accompanying condensed consolidated financial statements include the accounts and operations of Virtu Financial, Inc. (“VFI” or, collectively with its wholly owned or controlled subsidiaries, “Virtu” or the “Company”). VFI is a Delaware corporation whose primary asset is its ownership interest in Virtu Financial LLC (“Virtu Financial”). As of June 30, 2019 , VFI owned approximately 62.0% of the membership interests of Virtu Financial. VFI is the sole managing member of Virtu Financial and operates and controls all of the businesses and affairs of Virtu Financial and its subsidiaries (the “Group”). The Company is a leading financial firm that leverages cutting edge technology to deliver transparent trading solutions to its clients. The Company provides deep liquidity in over 25,000 financial instruments, at over 235 venues, in 36 countries worldwide to help create more efficient markets. It also leverages its market structure expertise and scaled, multi-asset technology infrastructure to provide a complete suite of client solutions, including transparent agency execution and broker-neutral offerings. On July 20, 2017 (the “KCG Closing Date”), the Company completed the all-cash acquisition of KCG Holdings, Inc. (“KCG”) (the “Acquisition of KCG”). On March 1, 2019 (the “ITG Closing Date”), the Company completed the acquisition of Investment Technology Group, Inc. and its subsidiaries (“ITG”) in an all-cash transaction valued at $30.30 per ITG share, for a total of approximately $1.0 billion (the “ITG Acquisition”). See Note 3 “ITG Acquisition” for further details. ITG was a global financial technology company that will contribute to the Company's Execution Services segment. Virtu Financial’s principal subsidiaries include Virtu Financial BD LLC (“VFBD”), Virtu Americas LLC (“VAL”), Virtu ITG LLC (“VITG”), Virtu Alternet Securities LLC (“VALT”) and Virtu Financial Capital Markets LLC (“VFCM”, collectively with VFBD, VAL, VITG, and VALT, the “broker-dealers”), which are self-clearing U.S. broker-dealers. Other principal U.S. subsidiaries include Virtu Financial Global Markets LLC, a U.S. trading entity focused on futures and currencies; Virtu ITG Analytics LLC, a provider of pre and post-trade analysis, fair value, and trade optimization services; and Virtu ITG Platforms LLC, a provider of workflow technology solutions and network connectivity services. Principal foreign subsidiaries include Virtu Financial Ireland Limited and Virtu ITG Europe Limited, each formed in Ireland; Virtu ITG Canada Corp., formed in Canada; Virtu Financial Asia Pty Ltd. and Virtu ITG Australia Limited, each formed in Australia; Virtu ITG Hong Kong Limited, formed in Hong Kong; and Virtu Financial Singapore Pte. Ltd. and Virtu ITG Singapore Pte. Ltd., each formed in Singapore, all of which are trading entities focused on asset classes in their respective geographic regions. The Company has two operating segments: (i) Market Making and (ii) Execution Services; and one non-operating segment: Corporate. See Note 21 “Geographic Information and Business Segments” for a further discussion of the Company’s segments. Basis of Consolidation and Form of Presentation These condensed consolidated financial statements are presented in U.S. dollars, have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding financial reporting with respect to Form 10-Q and accounting standards generally accepted in the United States of America (“U.S. GAAP”) promulgated by the Financial Accounting Standards Board (“FASB”) in the Accounting Standards Codification (“ASC” or the “Codification”), and reflect all adjustments that, in the opinion of management, are normal and recurring, and that are necessary for a fair statement of the results for the periods presented. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted in accordance with SEC rules and regulations. The condensed consolidated financial statements are unaudited and should be read in conjunction with the audited consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The condensed consolidated financial statements of the Company include its equity interests in Virtu Financial and its subsidiaries. The Company operates and controls all business and affairs of Virtu Financial and its operating subsidiaries indirectly through its equity interest in Virtu Financial. Certain reclassifications have been made to the prior periods’ condensed consolidated financial statements in order to conform to the current period presentation. Such reclassifications are immaterial, individually and in the aggregate, to both current and all previously issued financial statements taken as a whole and have no effect on previously reported consolidated net income available to common stockholders. The condensed consolidated financial statements include the accounts of the Company and its majority and wholly-owned subsidiaries. As sole managing member of Virtu Financial, the Company exerts control over the Group’s operations. The Company consolidates Virtu Financial and its subsidiaries’ financial statements and records the interests in Virtu Financial that the Company does not own as noncontrolling interests. All intercompany accounts and transactions have been eliminated in consolidation. As discussed in Note 3 “ITG Acquisition” , the Company has accounted for the ITG Acquisition under the acquisition method of accounting. Under the acquisition method of accounting, the assets and liabilities of ITG, as of the ITG Closing Date, were recorded at their respective fair values and added to the carrying value of the Company’s existing assets and liabilities. The reported financial condition, results of operations and cash flows of the Company for the periods following the ITG Acquisition reflect ITG's and the Company's balances, and reflect the impact of purchase accounting adjustments. The financial results for the three months ended June 30, 2019 comprise our results and the results of ITG for the entire applicable period. The financial results for the six months ended June 30, 2019 comprise our results for the entire applicable period and the results of ITG from the ITG Closing Date through June 30, 2019 . All periods prior to the ITG Closing Date comprise solely our results. .

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Use of Estimates The Company's condensed consolidated financial statements are prepared in conformity with U.S. GAAP, which require management to make estimates and assumptions regarding measurements including the fair value of trading assets and liabilities, goodwill and intangibles, compensation accruals, capitalized software, income tax, leases, and other matters that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Accordingly, actual results could differ materially from those estimates. Earnings Per Share Earnings per share (“EPS”) is calculated on both a basic and diluted basis. Basic EPS excludes dilution and is calculated by dividing income available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS is calculated by dividing the net income available for common stockholders by the diluted weighted average shares outstanding for that period. Diluted EPS includes the determinants of the basic EPS and, in addition, reflects the dilutive effect of shares of common stock estimated to be distributed in the future under the Company’s share based compensation plans. The Company grants restricted stock units (“RSUs”), certain of which entitle recipients to receive nonforfeitable dividends during the vesting period on a basis equivalent to the dividends paid to holders of common stock. As a result, the unvested RSUs meet the definition of a participating security requiring the application of the two-class method. Under the two-class method, earnings available to common shareholders, including both distributed and undistributed earnings, are allocated to each class of common stock and participating securities according to dividends declared and participating rights in undistributed earnings, which may cause diluted EPS to be more dilutive than the calculation using the treasury stock method. Cash and Cash Equivalents Cash and cash equivalents include money market accounts, which are payable on demand, and short-term investments with an original maturity of less than 90 days. The Company maintains cash in bank deposit accounts that, at times, may exceed federally insured limits. The Company manages this risk by selecting financial institutions deemed highly creditworthy to minimize the risk. Cash restricted or segregated under regulations and other represents (i) special reserve bank accounts for the exclusive benefit of customers (“Special Reserve Bank Account”) maintained by VAL and VITG in accordance with Rule 15c3-3 of the Securities Exchange Act of 1934, as amended (“Customer Protection Rule”), or proprietary accounts of broker-dealers, (ii) funds on deposit for Canadian and European trade clearing and settlement activity, (iii) segregated balances under a collateral account control agreement for the benefit of certain customers, and (iv) funds relating to the securitization of bank guarantees supporting certain of the Company’s foreign leases. Securities Borrowed and Securities Loaned The Company conducts securities borrowing and lending activities with external counterparties. In connection with these transactions, the Company receives or posts collateral, which comprises cash and/or securities. In accordance with substantially all of its stock borrow agreements, the Company is permitted to sell or repledge the securities received. Securities borrowed or loaned are recorded based on the amount of cash collateral advanced or received. The initial cash collateral advanced or received generally approximates or is greater than 102% of the fair value of the underlying securities borrowed or loaned. The Company monitors the fair value of securities borrowed and loaned, and delivers or obtains additional collateral as appropriate. Receivables and payables with the same counterparty are not offset in the condensed consolidated statements of financial condition. Interest received or paid by the Company for these transactions is recorded gross on an accrual basis under Interest and dividends income or Interest and dividends expense in the condensed consolidated statements of comprehensive income. Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase In a repurchase agreement, securities sold under agreements to repurchase are treated as collateralized financing transactions and are recorded at contract value, plus accrued interest, which approximates fair value. It is the Company's policy that its custodian take possession of the underlying collateral securities with a fair value approximately equal to the principal amount of the repurchase transaction, including accrued interest. For reverse repurchase agreements, the Company typically requires delivery of collateral with a fair value approximately equal to the carrying value of the relevant assets in the condensed consolidated statements of financial condition. To ensure that the fair value of the underlying collateral remains sufficient, the collateral is valued daily with additional collateral obtained or excess collateral returned, as permitted under contractual provisions. The Company does not net securities purchased under agreements to resell transactions with securities sold under agreements to repurchase transactions entered into with the same counterparty. The Company has entered into bilateral and tri-party term and overnight repurchase and other collateralized financing agreements which bear interest at negotiated rates. The Company receives cash and makes delivery of financial instruments to a custodian who monitors the market value of these instruments on a daily basis. The market value of the instruments delivered must be equal to or in excess of the principal amount loaned under the repurchase agreements plus the agreed upon margin requirement. The custodian may request additional collateral, if appropriate. Interest received or paid by the Company for these transactions is recorded gross on an accrual basis under Interest and dividends income or Interest and dividends expense in the condensed consolidated statements of comprehensive income. Receivables from/Payables to Broker-dealers and Clearing Organizations Receivables from and payables to broker-dealers and clearing organizations primarily represent amounts due for unsettled trades, open equity in futures transactions, securities failed to deliver or failed to receive, deposits with clearing organizations or exchanges and balances due from or due to prime brokers in relation to the Company’s trading. Amounts receivable from broker-dealers and clearing organizations may be restricted to the extent that they serve as deposits for securities sold, not yet purchased. The Company presents its balances, including outstanding principal balances on all credit facilities, on a net-by-counterparty basis within receivables from and payables to broker-dealers and clearing organizations when the criteria for offsetting are met. In the normal course of business, a significant portion of the Company’s securities transactions, money balances, and security positions are transacted with several third-party brokers. The Company is subject to credit risk to the extent any broker with whom it conducts business is unable to fulfill contractual obligations on its behalf. The Company monitors the financial condition of such brokers and to minimize the risk of any losses from these counterparties. Financial Instruments Owned Including Those Pledged as Collateral and Financial Instruments Sold, Not Yet Purchased Financial instruments owned and Financial instruments sold, not yet purchased relate to market making and trading activities, and include listed and other equity securities, listed equity options and fixed income securities. The Company records financial instruments owned, including those pledged as collateral, and financial instruments sold, not yet purchased at fair value. Gains and losses arising from financial instrument transactions are recorded net on a trade-date basis in trading income, net, in the condensed consolidated statements of comprehensive income. Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or would be paid to transfer a liability (i.e., the exit price) in an orderly transaction between market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. The recognition of “block discounts” for large holdings of unrestricted financial instruments where quoted prices are readily and regularly available in an active market is prohibited. The Company categorizes its financial instruments into a three level hierarchy which prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy level assigned to each financial instrument is based on the assessment of the transparency and reliability of the inputs used in the valuation of such financial instruments at the measurement date based on the lowest level of input that is significant to the fair value measurement. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurement) and the lowest priority to unobservable inputs (level 3 measurements). Financial instruments measured and reported at fair value are classified and disclosed in one of the following categories based on inputs: Level 1 — Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 — Quoted prices in markets that are not active and financial instruments for which all significant inputs are observable, either directly or indirectly; or Level 3 — Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. Transfers in or out of levels are recognized based on the beginning fair value of the period in which they occurred. Fair Value Option The fair value option election allows entities to make an irrevocable election of fair value as the initial and subsequent measurement attribute for certain eligible financial assets and liabilities. Unrealized gains and losses on items for which the fair value option has been elected are recorded in other, net in the condensed consolidated statements of comprehensive income. The decision to elect the fair value option is determined on an instrument by instrument basis, which must be applied to an entire instrument and is irrevocable once elected. Derivative Instruments Derivative instruments are used for trading purposes, including economic hedges of trading instruments, are carried at fair value, and include futures, forward contracts, and options. Gains or losses on these derivative instruments are recognized currently within trading income, net in the condensed consolidated statement of comprehensive income. Fair values for exchange-traded derivatives, principally futures, are based on quoted market prices. Fair values for over-the-counter derivative instruments, principally forward contracts, are based on the values of the underlying financial instruments within the contract. The underlying instruments are currencies, which are actively traded. The Company presents its derivatives balances on a net-by-counterparty basis when the criteria for offsetting are met. Cash flows associated with such derivative activities are included in cash flows from operating activities on the condensed consolidated statements of cash flows. Client Commission Arrangements Institutional customers are permitted to allocate a portion of their gross commissions to pay for research products and other services provided by third parties and the Company’s subsidiaries. The amounts allocated for those purposes are commonly referred to as client commission arrangements. The cost of independent research and directed brokerage arrangements is accounted for on an accrual basis. Commission revenue is recorded when earned on a trade date basis. Payments relating to client commission arrangements are netted against the commission revenues. Research receivable, including prepaid research on behalf of customers and balance transfers due from other broker‑dealers, net of an allowance is included in Receivables from customers and Receivables from broker-dealers and clearing organizations, while accrued research payable is included in Accounts payable, accrued expenses, and other liabilities in the condensed consolidated statements of financial condition. Property and Equipment Property and equipment are carried at cost, less accumulated depreciation, except for the assets acquired in connection with acquisitions using the purchase accounting method, which were recorded at fair value on the respective date of acquisitions. Depreciation is provided using the straight-line method over estimated useful lives of the underlying assets. Routine maintenance, repairs and replacement costs are expensed as incurred and improvements that appreciably extend the useful life of the assets are capitalized. When property and equipment are sold or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is recognized in income. Property and equipment are reviewed for impairment whenever events or changes in circumstances indicate that the related carrying amount may not be recoverable. Furniture, fixtures, and equipment are depreciated over three to seven years. Leasehold improvements are amortized over the lesser of the life of the improvement or the term of the lease. Capitalized Software The Company capitalizes costs of materials, consultants, and payroll and payroll related costs for employees incurred in developing internal-use software. Costs incurred during the preliminary project and post-implementation stages are charged to expense. Management’s judgment is required in determining the point at which various projects enter the stages at which costs may be capitalized, in assessing the ongoing value of the capitalized costs, and in determining the estimated useful lives over which the costs are amortized. Capitalized software development costs and related accumulated amortization are included in Property, equipment and capitalized software in the accompanying condensed consolidated statements of financial condition and are amortized over a period of 1.5 to 3 years, which represents the estimated useful lives of the underlying software. Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in Operating lease right-of use assets and Operating lease liabilities on the condensed consolidated statements of financial condition. Operating lease right-of-use (“ROU”) assets are assets that represent the lessee’s right to use, or control the use of, a specified asset for the lease term. Finance leases consist primarily of leases for technology and equipment and are included in Property, equipment, and capitalized software and Accounts payable, accrued expenses and other liabilities on the condensed consolidated statements of financial condition. ROU assets and lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at the commencement date. The Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. The ROU assets are reduced by lease incentives and initial direct costs incurred. The Company's lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for operating leases and amortization of the finance lease ROU asset is recognized on a straight-line basis over the lease term. Certain of the Company's lease agreements contain fixed lease payments that contain lease and non-lease components; for such leases, the Company accounts for the lease and non-lease components as a single lease component. Goodwill Goodwill represents the excess of the purchase price over the underlying net tangible and intangible assets of the Company’s acquisitions. Goodwill is not amortized but is assessed for impairment on an annual basis and between annual assessments whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Goodwill is assessed at the reporting unit level, which is defined as an operating segment or one level below the operating segment. The Company assesses goodwill for impairment on an annual basis on July 1 and on an interim basis when certain events occur or certain circumstances exist. In the impairment assessment as of July 1, 2018, the Company assessed qualitative factors as described in ASC 350-20 for each of its reporting units for any indicators that the fair values of the reporting units were less than their carrying values. Intangible Assets The Company amortizes finite-lived intangible assets over their estimated useful lives. Finite-lived intangible assets are tested for impairment when impairment indicators are present, and if impaired, they are written down to fair value. Exchange Memberships and Stock Exchange memberships are recorded at cost or, if any other than temporary impairment in value has occurred, at a value that reflects management’s estimate of fair value. Exchange memberships acquired in connection with the Acquisition of KCG and the ITG Acquisition were recorded at their fair value on the date of acquisition. Exchange stock includes shares that entitle the Company to certain trading privileges. The Company’s exchange memberships and stock are included in intangibles in the condensed consolidated statements of financial condition. Trading Income, net Trading income, net is comprised of changes in the fair value of trading assets and liabilities (i.e., unrealized gains and losses) and realized gains and losses on trading assets and liabilities. Trading gains and losses on financial instruments owned and financial instruments sold, not yet purchased are recorded on the trade date and reported on a net basis in the condensed consolidated statements of comprehensive income. Commissions, net and Technology Services Commissions, net, which primarily comprise commissions and commission equivalents earned on institutional client orders, are recorded on a trade date basis. Under a commission management program, the Company allows institutional clients to allocate a portion of their gross commissions to pay for research and other services provided by third parties. The Company recognizes the related revenue when the third party research services are rendered and payments are made. As the Company acts as an agent in these transactions, it records such expenses on a net basis within commissions, net and technology services in the condensed consolidated statements of comprehensive income. Technology services revenues consist of technology licensing fees and agency commission fees. Technology licensing fees are earned from third parties for licensing of the Company’s proprietary risk management and trading infrastructure technology and the provision of associated management and hosting services. These fees include both upfront and annual recurring fees, as well as, in certain cases, contingent fees based on client revenues, which represent variable consideration. The services offered under these contracts have the same pattern of transfer; accordingly, they are being measured and recognized as a single performance obligation. The performance obligation is satisfied over time, and accordingly, revenue is recognized as time passes. Variable consideration has not been included in the transaction price as the amount of consideration is contingent on factors outside the Company’s control and thus it is not probable that a significant reversal of cumulative revenue recognized will not occur. Recurring fees, which exclude variable consideration, are billed and collected on a quarterly basis. The Company also provides order management software (“OMS”) and related software products and connectivity services to customers and recognizes license fee revenues and monthly connectivity fees. License fee revenues, generated for the use of the Company’s OMS and other software products, is fixed and recognized at the point in time at which the customer is able to use and benefit from the license. Connectivity revenue is variable in nature, based on the number of live connections, and is recognized over time on a monthly basis using a time-based measure of progress. The Company also provides analytics products and services to customers and recognizes subscription fees, which are fixed for the contract term, based on when the products and services are delivered. Analytics products and services may be bundled with trade execution services, in which case commissions are allocated to the analytics performance obligations using an allocation methodology. Interest and Dividends Income/Interest and Dividends Expense Interest income and interest expense are accrued in accordance with contractual rates. Interest income consists of interest earned on collateralized financing arrangements and on cash held by brokers. Interest expense includes interest expense from collateralized transactions, margin and related lines of credit. Dividends on financial instruments owned including those pledged as collateral and financial instruments sold, not yet purchased are recorded on the ex-dividend date and interest is recognized on an accrual basis. Brokerage, Exchange and Clearance Fees, Net Brokerage, exchange and clearance fees, net, comprise the costs of executing and clearing trades and are recorded on a trade date basis. Rebates consist of volume discounts, credits or payments received from exchanges or other market places related to the placement and/or removal of liquidity from the order flow in the marketplace. Rebates are recorded on an accrual basis and included net within brokerage, exchange and clearance fees in the accompanying condensed consolidated statements of comprehensive income. Payments for Order Flow Payments for order flow represent payments to broker-dealer clients, in the normal course of business, for directing their order flow in U.S. equities to the Company. Payments for order flow are recorded on a trade-date basis in the condensed consolidated statements of comprehensive income. Income Taxes The Company is subject to U.S. federal, state and local income taxes on its taxable income. The Company's subsidiaries are subject to income taxes in the respective jurisdictions (including foreign jurisdictions) in which they operate. The provision for income tax is comprised of current tax and deferred tax. Current tax represents the tax on current year tax returns, using tax rates enacted at the balance sheet date. The deferred tax assets are recognized in full and then reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax assets will not be recognized. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the applicable taxing authority, including resolution of the appeals or litigation processes, based on the technical merits of the position. The tax benefits recognized in the condensed consolidated financial statements from such a position are measured based on the largest benefit for each such position that has a greater than fifty percent likelihood of being realized upon ultimate resolution. Many factors are considered when evaluating and estimating the tax positions and tax benefits. Such estimates involve interpretations of regulations, rulings, case law, etc. and are inherently complex. The Company’s estimates may require periodic adjustments and may not accurately anticipate actual outcomes as resolution of income tax treatments in individual jurisdictions typically would not be known for several years after completion of any fiscal year. Comprehensive Income and Foreign Currency Translation Comprehensive income consists of two components: net income and other comprehensive income (“OCI”). The Company’s OCI is comprised of foreign currency translation adjustments. Assets and liabilities of operations having non-U.S. dollar functional currencies are translated at period-end exchange rates, and revenues and expenses are translated at weighted average exchange rates for the period. Gains and losses resulting from translating foreign currency financial statements, net of related tax effects, are reflected in accumulated other comprehensive income, a separate component of stockholders’ equity. The Company's foreign subsidiaries generally use the U.S. dollar as their functional currency. The Company also has subsidiaries that utilize a functional currency other than the U.S. dollar, primarily comprising its subsidiaries domiciled in Ireland, which utilize the Euro and Pound Sterling as the functional currency. The Company may seek to reduce the impact of fluctuations in foreign exchange rates on its net investment in certain non-U.S. operations through the use of foreign currency forward contracts. For foreign currency forward contracts designated as hedges, the Company assesses its risk management objectives and strategy, including identification of the hedging instrument, the hedged item and the risk exposure and how effectiveness is to be assessed prospectively and retrospectively. The effectiveness of the hedge is assessed based on the overall changes in the fair value of the forward contracts. For qualifying net investment hedges, any gains or losses, to the extent effective, are included in Accumulated other comprehensive income on the condensed consolidated statements of financial condition and Cumulative translation adjustment, net of tax, on the condensed consolidated statements of comprehensive income. The ineffective portion, if any, is recorded in investment income and Other, net on the condensed consolidated statements of operations. Share-Based Compensation The fair value of awards issued for compensation prior to the Company's initial public offering in April 2015 (the “IPO”) and certain reorganization transactions consummated in connection with the IPO (the “Reorganization Transactions”) was determined by management, with the assistance of an independent third party valuation firm, using a projected annual forfeiture rate, where applicable, on the date of grant. Share-based awards issued for compensation in connection with or subsequent to the Reorganization Transactions and the IPO pursuant to the Virtu Financial, Inc. 2015 Management Incentive Plan (as amended, the “Amended and Restated 2015 Management Incentive Plan”) and pursuant to the Amended and Restated Investment Technology Group, Inc. 2007 Omnibus Equity Compensation Plan, dated as of June 8, 2017 (the “Amended and Restated ITG 2007 Equity Plan”), were in the form of stock options, Class A common stock, par value $0.00001 per share (the “Class A Common Stock”) and RSUs, as applicable. The fair value of the stock option grants is determined through the application of the Black-Scholes-Merton model. The fair value of the Class A Common Stock and RSUs are determined based on the volume weighted average price for the three days preceding the grant, and with respect to the RSUs, a projected annual forfeiture rate. The fair value of share-based awards granted to employees is expensed based on the vesting conditions and are recognized on a straight-line basis over the vesting period. The Company records as treasury stock shares repurchased from its employees for the purpose of settling tax liabilities incurred upon the issuance of Class A Common Stock, the vesting of RSUs or the exercise of stock options. Variable Interest Entities A variable interest entity (“VIE”) is an entity that lacks one or more of the following characteristics: (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders have the power to direct the activities of the entity that most significantly impact its economic performance, the obligation to absorb the losses of the entity and the right to receive the residual returns of the entity. The Company will be considered to have a controlling financial interest and will consolidate a VIE if it has both (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. In October 2016, the Company invested in a joint venture (“JV”) with nine other parties. One of the parties was KCG. Upon the Acquisition of KCG, KCG was required to relinquish its ownership in the JV. As of June 30, 2019 , each of the parties owns approximately 10% of the voting shares and 10% of the equity of this JV. In addition, as a result of the Acquisition of KCG, the Company owns 50% of the voting shares and 50% of the equity of another JV. These two JVs build and maintain microwave communication networks in the U.S., Europe, and Asia. The Company and its JV partners each pay monthly fees for the use of the microwave communication networks in connection with their respective trading activities, and the JVs may sell excess bandwidth that is not utilized by the JV members to third parties. The Company also has an interest in a JV that offers derivatives trading technology and execution services to broker-dealers, professional traders and select hedge funds. As of June 30, 2019 , the Company held approximately a 10% indirect minority stake in this JV. The Company's three JVs meet the criteria to be considered VIEs. In each of the JVs, the Company does not have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; therefore it does not have a controlling financial interest in and does not consolidate the JVs. The Company records its interest in each JV under the equity method of accounting and records its investment in the JVs within Other assets and its amounts payable for communication services provided by the JV within Accounts Payable, accrued expenses and other liabilities on the condensed consolidated statements of financial condition. The Company records its pro-rata share of each JV's earnings or losses within Other, net and fees related to the use of communication services provided by the JVs within Communications and data processing on the condensed consolidated statements of comprehensive income. The Company’s exposure to the obligations of these VIEs is generally limited to its interests in each respective JV, which is the carrying value of the equity investment in each JV. The following table presents the Company’s nonconsolidated VIEs at June 30, 2019 : Carrying Amount Maximum Exposure to Loss VIEs' assets (in thousands) Asset Liability Equity investment $ 18,520 $ — $ 18,520 $ 52,892 The following table presents the Company’s nonconsolidated VIEs at December 31, 2018 : Carrying Amount Maximum Exposure to Loss VIEs' assets (in thousands) Asset Liability Equity investment $ 18,254 $ — $ 18,254 $ 49,450 Accounting Pronouncements, Recently Adopted Revenue Recognition - In May 2014, the FASB issued Accounting Standard Update (“ASU”) 2014-09, Revenue from Contracts with Customers . ASU 2014-09 is a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. For a discussion of the impact of the new standard on the Company’s revenues as well as the additional disclosures required by the new standard, see Note 13 “Revenues from Contracts with Customers” . Leases — In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842)

ITG Acquisition

ITG Acquisition	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
ITG Acquisition	ITG Acquisition Background On the ITG Closing Date, the Company completed the ITG Acquisition. In connection with the ITG Acquisition, Virtu Financial, VFH Parent LLC, a Delaware limited liability company and a subsidiary of Virtu Financial (“VFH”) and Impala Borrower LLC (the “Acquisition Borrower”), a subsidiary of the Company, entered into a Credit Agreement dated as of March 1, 2019 (the “Credit Agreement”), with the lenders party thereto, Jefferies Finance LLC, as administrative agent and Jefferies Finance LLC and RBC Capital Markets, as joint lead arrangers and joint bookrunners. The Credit Agreement provides (i) a senior secured first lien term loan in an aggregate principal amount of $1.5 billion , drawn in its entirety on the ITG Closing Date, with approximately $404.5 million being borrowed by VFH to repay all amounts outstanding under its existing term loan facility and the remaining approximately $1,095.0 million being borrowed by the Acquisition Borrower to finance the consideration and fees and expenses paid in connection with the ITG Acquisition, and (ii) a $50.0 million senior secured first lien revolving facility to VFH, with a $5.0 million letter of credit subfacility and a $5.0 million swingline subfacility. After the closing of the ITG Acquisition, VFH assumed the obligations of the Acquisition Borrower in respect of the acquisition term loans. Additionally, on the ITG Closing Date, the Company’s fourth amended and restated credit agreement (as amended on January 2, 2018 and September 19, 2018, the “Fourth Amended and Restated Credit Agreement”) with the lenders party thereto and JPMorgan Chase Bank, N.A., as administrative agent, sole lead arranger and bookrunner, was terminated. Accounting treatment of the ITG Acquisition The ITG Acquisition has been accounted for as a business combination pursuant to ASC 805, Business Combinations by the Company using the acquisition method of accounting. Under the acquisition method, the assets and liabilities of ITG, as of the ITG Closing Date, were recorded at their respective fair values and added to the carrying value of the Company's existing assets and liabilities. The reported financial condition and results of operations of the Company for the periods following the ITG Closing Date reflect ITG's and the Company's balances and reflect the impact of purchase accounting adjustments. As the Company is the accounting acquirer, the financial results for the three and six months ended June 30, 2019 comprise the results of the Company for the entire applicable period and the results of ITG from the ITG Closing Date through June 30, 2019 . All periods prior to the ITG Closing Date comprise solely the results of the Company. Certain former ITG management employees were terminated upon the ITG Acquisition, and as a result were paid an aggregate of $17.6 million pursuant to their existing employment contracts and arrangements. This amount has been recognized as an expense by the Company and is included in Employee compensation and payroll taxes in the condensed consolidated statements of comprehensive income for the six months ended June 30, 2019 . Purchase price and goodwill The aggregate cash purchase price of $1.0 billion was determined as the sum of the fair value, at $30.30 per share, of ITG shares outstanding held by former ITG stockholders at closing and the fair value of certain ITG employee stock-based awards that were outstanding, and which vested at the ITG Closing Date. The purchase price has been allocated to the assets acquired and liabilities assumed using their estimated fair values at the ITG Closing Date. The Company has not yet completed its analysis to finalize the allocation of the purchase price to the ITG acquired assets and liabilities. The allocation of the purchase price may be modified over the measurement period, as more information is obtained about the fair values of assets acquired and liabilities assumed. The Company has engaged third party specialists for the purchase price allocation. The amounts in the table below represent the allocation of the purchase price and are subject to revision during the remainder of the measurement period, a period not to exceed twelve months from the ITG Closing Date. Adjustments to the provisional fair values of Other assets and Accounts Payable and accrued expenses and other liabilities were recorded during the three months ended June 30, 2019. Further adjustments during the measurement period will be recorded in the reporting period in which the adjustment amounts are determined. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the ITG Closing Date: (in thousands) March 31, 2019 Measurement Period June 30, 2019 Cash and equivalents $ 197,072 $ — $ 197,072 Cash and securities segregated under federal regulations 14,232 — 14,232 Securities borrowed 13,182 — 13,182 Receivables from broker dealers and clearing organizations 328,112 — 328,112 Financial instruments owned, at fair value 523 — 523 Receivables from customers 122,697 — 122,697 Property, equipment and capitalized software (net) 46,408 — 46,408 Intangibles 479,600 — 479,600 Deferred tax assets 17,221 — 17,221 Operating lease right-of-use assets 87,236 — 87,236 Other assets 31,653 4,400 36,053 Total Assets 1,337,936 4,400 1,342,336 Short-term borrowings 18,651 — 18,651 Securities loaned 17,663 — 17,663 Payables to broker dealers and clearing organizations 152,043 — 152,043 Payables to customers 116,419 — 116,419 Financial instruments sold, not yet purchased, at fair value 11 — 11 Accounts payable and accrued expenses and other liabilities 172,727 7,500 180,227 Operating lease liabilities 104,983 — 104,983 Deferred tax liabilities 65,888 — 65,888 Total Liabilities 648,385 7,500 655,885 Total identified assets acquired, net of assumed liabilities 689,551 (3,100 ) 686,451 Goodwill 357,334 3,100 360,434 Total Purchase Price $ 1,046,885 $ — $ 1,046,885 Amounts preliminarily allocated to intangible assets, the amortization period and goodwill were as follows: (in thousands) Amount Amortization Technology $ 93,000 5 Customer relationships 383,000 10 Trade names 3,600 3 Intangible assets 479,600 Goodwill 360,434 Total $ 840,034 The total Goodwill of $360.4 million has been assigned to the Execution Services segment. Such goodwill is attributable to the expansion of product offerings and expected synergies of the combined workforce, products and technologies of the Company and ITG. Assumption of Equity Compensation Plan On the ITG Closing Date, the Company assumed the Amended and Restated ITG 2007 Equity Plan and certain stock option awards, restricted stock unit awards, deferred stock unit awards and performance stock unit awards granted under the Amended and Restated ITG 2007 Equity Plan (the “Assumed Awards”). The Assumed Awards are subject to the same terms and conditions that were applicable to them under the Amended and Restated ITG 2007 Equity Plan, except that (i) the Assumed Awards relate to shares of the Company’s Class A Common Stock, (ii) the number of shares of Class A Common Stock subject to the Assumed Awards was the result of an adjustment based upon an Exchange Ratio (as defined in the Agreement and Plan of Merger by and between the Company, Impala Merger Sub, Inc., a Delaware corporation and an indirect wholly owned subsidiary of the Company, and ITG, dated as of November 6, 2018, the “ITG Merger Agreement”) and (iii) the performance share unit awards were converted into service-based vesting restricted stock unit awards that were no longer subject to any performance-based vesting conditions. As of the ITG Closing Date, the aggregate number of shares of Class A Common Stock subject to such Assumed Awards was 2,497,028 and the aggregate number of shares of Class A Common Stock that remained issuable pursuant to the Amended and Restated ITG 2007 Equity Plan was 1,230,406 . The Company filed with the Securities and Exchange Commission a Registration Statement on Form S-8 on the ITG Closing Date to register such shares of Class A Common Stock. Tax treatment of the ITG Acquisition The Company believes that the ITG Acquisition will be treated as a tax-free transaction as described in Section 351 of the Internal Revenue Code. ITG’s tax basis in its assets and liabilities therefore generally carried over to the Company following the ITG Acquisition. None of the goodwill is expected to be deductible for tax purposes. The Company recorded deferred tax assets of $17.2 million and deferred tax liabilities of $65.9 million with respect to recording ITG’s assets and liabilities under the purchase method of accounting as described above as well as recording the value of other tax attributes acquired as a result of the ITG Acquisition, as described in Note 14 “Income Taxes” . Pro forma results Included in the Company’s results for the three and six months ended June 30, 2019 are results from the business acquired as a result of the ITG Acquisition, from the ITG Closing Date through June 30, 2019 as follows: (in thousands) Three Months Ended Six Months Ended Revenues $ 106,160 $ 142,061 Income (loss) before income taxes (1,666 ) (50,074 ) The financial information in the table below summarizes the combined pro forma results of operations of the Company and ITG, based on adding the pre-tax historical results of ITG and the Company, and adjusting primarily for amortization of intangibles created in the ITG Acquisition, debt raised in conjunction with the ITG Acquisition and nonrecurring costs associated with the ITG Acquisition, which comprise advisory and other professional fees incurred by the Company and ITG of $15.1 million and $18.2 million , respectively. The pro forma data assumes all of ITG’s issued and outstanding shares of common stock, par value $0.01 per share, were cancelled and extinguished and converted into the right to receive $30.30 in cash, without interest, less any applicable withholding taxes on January 1, 2018 and does not include adjustments to reflect the Company's operating costs or expected differences in the way funds generated by the Company are invested. This pro forma financial information is based on estimates and assumptions that have been made solely for purposes of developing such pro forma information, including, without limitation, preliminary purchase accounting adjustments. The pro forma financial information does not reflect any synergies or operating cost reductions that may be achieved from the combined operations. The pro forma financial information combines the historical results for the Company and ITG for the three and six months ended June 30, 2019 and 2018 : For the Three Months Ended June 30, For the Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Revenue $ 378,456 $ 456,584 $ 816,706 $ 1,403,140 Net income (loss) (53,235 ) 11,851 (70,890 ) 380,844 Net income (loss) available for common stockholders (31,477 ) 12,021 (37,510 ) 166,768

Sale of BondPoint

Sale of BondPoint	6 Months Ended
	Jun. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]
Sale of BondPoint	Sale of BondPoint In October 2017, the Company entered into an Asset Purchase Agreement with Intercontinental Exchange (“ICE”) pursuant to which the Company has agreed to sell specified assets and to assign specified liabilities constituting its BondPoint division and fixed income venue (“BondPoint”). BondPoint is a provider of electronic fixed income trading solutions for the buy-side and sell-side offering access to centralized liquidity and automated trade execution services. On January 2, 2018, the Company completed the sale of BondPoint to ICE for total gross proceeds of $400.2 million in cash. The Company incurred one-time transaction costs of $8.5 million , which included professional fees of $7.1 million related to the sale and $1.4 million of compensation expense, which is recorded in Transaction advisory fees and expenses and Employee compensation and payroll taxes , respectively, on the condensed consolidated statement of comprehensive income. The Company recognized a gain on sale of $337.6 million , which is recorded in Other, net on the condensed consolidated statement of comprehensive income for the six months ended June 30, 2018 . A summary of the carrying value of BondPoint and gain on sale of BondPoint is as follows: (in thousands) Total sale proceeds received $ 400,192 Business assets and liabilities held for sale as of December 31, 2017: Receivables from broker dealers and clearing organizations 3,383 Intangibles and other assets 51,687 Liabilities (728 ) Total carrying value of BondPoint as of December 31, 2017: 54,342 Goodwill adjustment allocated to BondPoint 8,300 Gain on sale of BondPoint 337,550 Transaction costs 8,568 Gain on sale of BondPoint, net of transaction costs $ 328,982

Earnings per Share

Earnings per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share The below table contains a reconciliation of net income (loss) before noncontrolling interest to net income (loss) available for common stockholders: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Income (loss) before income taxes and noncontrolling interest $ (66,579 ) $ 49,622 $ (82,783 ) $ 518,160 Provision for (benefit from) income taxes (11,094 ) 3,000 (13,679 ) 61,515 Net income (loss) (55,485 ) 46,622 (69,104 ) 456,645 Noncontrolling interest 25,594 (21,413 ) 32,540 (256,684 ) Net income (loss) available for common stockholders $ (29,891 ) $ 25,209 $ (36,564 ) $ 199,961 The calculation of basic and diluted earnings per share is presented below: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except for share or per share data) 2019 2018 2019 2018 Basic earnings (loss) per share: Net income (loss) available for common stockholders $ (29,891 ) $ 25,209 $ (36,564 ) $ 199,961 Less: Dividends and undistributed earnings allocated to participating securities (466 ) (443 ) (907 ) (3,611 ) Net income (loss) available for common stockholders, net of dividends and undistributed earnings allocated to participating securities (30,357 ) 24,766 (37,471 ) 196,350 Weighted average shares of common stock outstanding: Class A 112,828,240 99,542,659 110,076,375 95,124,675 Basic earnings (loss) per share $ (0.27 ) $ 0.25 $ (0.34 ) $ 2.06 Three Months Ended June 30, Six Months Ended June 30, (in thousands, except for share or per share data) 2019 2018 2019 2018 Diluted earnings (loss) per share: Net income (loss) available for common stockholders, net of dividends and undistributed earnings allocated to participating securities $ (30,357 ) $ 24,766 $ (37,471 ) $ 196,350 Weighted average shares of common stock outstanding: Class A Issued and outstanding 112,828,240 99,542,659 110,076,375 95,124,675 Issuable pursuant to Amended and Restated 2015 Management Incentive Plan (1) — 2,076,992 — 2,030,429 112,828,240 101,619,651 110,076,375 97,155,104 Diluted earnings (loss) per share $ (0.27 ) $ 0.24 $ (0.34 ) $ 2.02 (1) The dilutive impact excludes from the computation of earnings (loss) per share for the three and six months ended June 30, 2019, respectively, 669,064 and 746,392 unexercised stock options and 299,288 and 262,785 restricted stock units issuable pursuant to Amended and Restated Investment Technology Group, Inc. 2007 Omnibus Equity Compensation Plan because the inclusion of the options and restricted stock units would have been anti-dilutive.

Tax Receivable Agreements

Tax Receivable Agreements	6 Months Ended
	Jun. 30, 2019
Tax Receivable Agreements [Abstract]
Tax Receivable Agreements	Tax Receivable Agreements In connection with the IPO and the Reorganization Transactions, the Company entered into tax receivable agreements to make payments to certain pre-IPO equityholders (“Virtu Members”) that are generally equal to 85% of the applicable cash tax savings, if any, that the Company actually realizes as a result of favorable tax attributes that were and will continue to be available to the Company as a result of the Reorganization Transactions, exchanges of membership interests for Class A Common Stock or Class B common stock, par value $0.00001 per share (the “Class B Common Stock”), and payments made under the tax receivable agreements. Payments will occur only after the filing of the U.S. federal and state income tax returns and realization of the cash tax savings from the favorable tax attributes. The Company made its first payment of $7.0 million in February 2017 and its second payment of $12.4 million in September 2018. As a result of (i) the purchase of equity interests in Virtu Financial from certain Virtu Members in connection with the Reorganization Transactions, (ii) the purchase of non-voting common interest units in Virtu Financial (the “Virtu Financial Units”) (along with the corresponding shares of Class C common stock, par value $0.00001 per share (the “Class C Common Stock”)) from certain of the Virtu Members in connection with the IPO, (iii) the purchase of Virtu Financial Units (along with the corresponding shares of Class C Common Stock) and the exchange of Virtu Financial Units (along with the corresponding shares of Class C Common Stock) for shares of Class A Common Stock in connection with the secondary offerings completed in November 2015 (the “November 2015 Secondary Offering”) and September 2016 (the “September 2016 Secondary Offering”), and (iv) the purchase of Virtu Financial Units (along with corresponding shares of the Company’s Class D common stock, par value $0.00001 per share (the “Class D Common Stock”) the May 2018 Secondary Offering (defined below) and the May 2019 Secondary Offering (defined below, and, together with the November 2015 Secondary Offering, the September 2016 Secondary Offering, and the May 2018 Secondary Offering, the “Secondary Offerings”), payments to certain Virtu Members in respect of the purchases are expected to range from approximately $2.6 million to $19.9 million per year over the next 15 years . In connection with the employee exchanges and May 2018 Secondary Offering between the Company and TJMT Holdings LLC and the other selling stockholders, both as described in Note 18 “Capital Structure” , the Company recorded an additional deferred tax asset of $78.7 million and payment liability pursuant to the tax receivable agreements of $79.7 million , with the $1.0 million difference recorded as a decrease to additional paid-in capital. In connection with the May 2019 Secondary Offering, as described in Note 18 “Capital Structure” , the Company recorded an additional deferred tax asset of $41.7 million and payment liability pursuant to the tax receivable agreements of $42.3 million , with the $0.6 million difference recorded as a decrease to additional paid-in capital. As a result of the reduction in the U.S. corporate income tax rate as described below, the aforementioned deferred tax asset and related payment liability were subsequently reduced as described below. The amounts recorded as of June 30, 2019 are based on best estimates available at the respective dates and may be subject to change after the filing of the Company’s U.S. federal and state income tax returns for the years in which tax savings were realized. At December 31, 2017, the Company recorded a reduction of its tax receivable agreement obligation of $86.6 million due to the change in the corporate income tax rate. At June 30, 2019 and December 31, 2018 , the Company’s remaining deferred tax assets that relate to the matters described above were approximately $200.4 million and $167.1 million , respectively, and the Company’s liabilities over the next 15 years pursuant to the tax receivable agreements were approximately $256.7 million and $214.4 million , respectively. For the tax receivable agreements discussed above, the cash savings realized by the Company are computed by comparing the actual income tax liability of the Company to the amount of such taxes the Company would have been required to pay had there been (i) no increase to the tax basis of the assets of Virtu Financial as a result of the purchase or exchange of Virtu Financial Units, (ii) no tax benefit from the tax basis in the intangible assets of Virtu Financial on the date of the IPO and (iii) no tax benefit as a result of the Net Operating Losses (“NOLs”) and other tax attributes of Virtu Financial. Subsequent adjustments of the tax receivable agreements obligations due to certain events (e.g., changes to the expected realization of NOLs or changes in tax rates) will be recognized within income before taxes and noncontrolling interests in the condensed consolidated statements of comprehensive income.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets The Company has two operating segments: (i) Market Making; (ii) Execution Services; and one non-operating segment: Corporate. As of June 30, 2019 and December 31, 2018 , the Company’s total amount of goodwill recorded was $1,196.5 million and $836.6 million , respectively. The Company recognized $360.4 million of goodwill in connection with the ITG Acquisition, which was recorded in the Execution Services segment. No goodwill impairment was recognized during the three and six months ended June 30, 2019 and 2018 . The following table presents the details of goodwill by segment: (in thousands) Market Making Execution Services Corporate Total Balance as of December 31, 2018 $ 755,292 $ 81,291 $ — $ 836,583 Goodwill recognized in ITG Acquisition — 360,434 — 360,434 Currency translation adjustment — (469 ) $ — (469 ) Balance as of June 30, 2019 $ 755,292 $ 441,256 $ — $ 1,196,548 As of June 30, 2019 and December 31, 2018 , the Company's total amount of intangible assets recorded was $532.1 million and $84.0 million , respectively. The Company acquired $479.6 million of intangible assets in connection with the ITG Acquisition. Acquired intangible assets consisted of the following as of June 30, 2019 and December 31, 2018 : As of June 30, 2019 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Useful Lives (Years) Purchased technology $ 110,000 $ 110,000 $ — 1.4 to 2.5 ETF issuer relationships 950 718 232 9 ETF buyer relationships 950 718 232 9 Technology 153,000 45,990 107,010 1 to 6 Customer relationships 432,000 20,715 411,285 10 to 12 Trade name 3,600 400 3,200 3 Favorable occupancy leases 5,895 1,631 4,264 3 to 15 Exchange memberships 5,838 — 5,838 Indefinite $ 712,233 $ 180,172 $ 532,061 As of December 31, 2018 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Useful Lives Purchased technology $ 110,000 $ 110,000 $ — 1.4 to 2.5 ETF issuer relationships 950 665 285 9 ETF buyer relationships 950 665 285 9 Technology 60,000 30,185 29,815 1 to 6 Customer relationships 49,000 5,905 43,095 12 Favorable occupancy leases 5,895 1,224 4,671 3 to 15 Exchange memberships 5,838 — 5,838 Indefinite $ 232,633 $ 148,644 $ 83,989 Amortization expense relating to finite-lived intangible assets was approximately $20.6 million and $6.8 million for the three months ended June 30, 2019 and 2018 , respectively, and $31.5 million and $13.7 million for the six months ended June 30, 2019 and 2018 , respectively. This is included in Amortization of purchased intangibles and acquired capitalized software in the accompanying condensed consolidated statements of comprehensive income.

Receivables from_Payables to Br

Receivables from/Payables to Broker-Dealers and Clearing Organizations	6 Months Ended
	Jun. 30, 2019
Due to and from Broker-Dealers and Clearing Organizations [Abstract]
Receivables from/Payables to Broker-Dealers and Clearing Organizations	Receivables from/Payables to Broker-Dealers and Clearing Organizations The following is a summary of receivables from and payables to brokers-dealers and clearing organizations at June 30, 2019 and December 31, 2018 : (in thousands) June 30, 2019 December 31, 2018 Assets Due from prime brokers $ 250,936 $ 302,152 Deposits with clearing organizations 224,049 84,509 Net equity with futures commission merchants 254,237 294,884 Unsettled trades with clearing organization 321,210 193,544 Securities failed to deliver 229,086 218,663 Commissions and fees 7,573 7,697 Total receivables from broker-dealers and clearing organizations $ 1,287,091 $ 1,101,449 Liabilities Due to prime brokers $ 339,899 $ 354,300 Net equity with futures commission merchants 44,084 47,998 Unsettled trades with clearing organization 148,949 90,021 Securities failed to receive 133,946 73,547 Commissions and fees 1,667 1,575 Total payables to broker-dealers and clearing organizations $ 668,545 $ 567,441 Included as a deduction from “Due from prime brokers” and “Net equity with futures commission merchants” is the outstanding principal balance on all of the Company’s short-term credit facilities (described in Note 10 “Borrowings” ) of approximately $156.9 million and $184.6 million as of June 30, 2019 and December 31, 2018 , respectively. The loan proceeds from the credit facilities are available only to meet the initial margin requirements associated with the Company’s ordinary course futures and other trading positions, which are held in the Company’s trading accounts with an affiliate of the respective financial institutions. The credit facilities are fully collateralized by the Company’s trading accounts and deposit accounts with these financial institutions. “Securities failed to deliver” and “Securities failed to receive” include amounts with a clearing organization and other broker-dealers.

Collateralized Transactions

Collateralized Transactions	6 Months Ended
	Jun. 30, 2019
Collateralized Agreements [Abstract]
Collateralized Transactions	Collateralized Transactions The Company is permitted to sell or repledge securities received as collateral and use these securities to secure repurchase agreements, enter into securities lending transactions or deliver these securities to counterparties or clearing organizations to cover short positions. At June 30, 2019 and December 31, 2018 , substantially all of the securities received as collateral have been repledged. The fair value of the collateralized transactions at June 30, 2019 and December 31, 2018 are summarized as follows: (in thousands) June 30, 2019 December 31, 2018 Securities received as collateral: Securities borrowed $ 1,173,186 $ 1,361,635 Securities purchased under agreements to resell 22,974 15,475 $ 1,196,160 $ 1,377,110 In the normal course of business, the Company pledges qualified securities with clearing organizations to satisfy daily margin and clearing fund requirements. Financial instruments owned and pledged, where the counterparty has the right to repledge, at June 30, 2019 and December 31, 2018 consisted of the following: (in thousands) June 30, 2019 December 31, 2018 Equities $ 618,707 $ 748,846 Exchange traded notes 51,294 42,269 $ 670,001 $ 791,115

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Borrowings	Borrowings Broker-Dealer Credit Facilities The Company is a party to two secured credit facilities with a financial institution to finance overnight securities positions purchased as part of its ordinary course broker-dealer market making activities. One of the facilities (the “Uncommitted Facility”) is provided on an uncommitted basis with an aggregate borrowing limit of $200 million and is collateralized by the trading and deposit account of one of the Company’s broker-dealer subsidiaries maintained at the financial institution. On November 3, 2017, the Company entered into the second credit facility (the “Committed Facility”) with the same financial institution for an aggregate borrowing limit of $500 million . The Committed Facility was subsequently amended and restated March 1, 2019 to increase the borrowing limit to $600 million and to enable a broker-dealer subsidiary of ITG as a borrower thereunder. The Committed Facility consists of two borrowing bases: Borrowing Base A Loan is to be used to finance the purchase and settlement of securities; Borrowing Base B Loan is to be used to fund margin deposit with the National Securities Clearing Corporation. Each of the three broker-dealers has a sublimit under Borrowing Base A Loan, from $400 million to $600 million , which bears interest at the adjusted LIBOR or base rate plus 1.25% per annum. Each of the three broker-dealers has a sublimit under Borrowing Base B Loan, from $40 million to $150 million , which bears interest at the adjusted LIBOR or base rate plus 2.50% per annum. A commitment fee of 0.50% per annum on the average daily unused portion of this facility is payable quarterly in arrears. The following summarizes the Company’s broker-dealer credit facilities' carrying values, net of unamortized debt issuance costs, where applicable: At June 30, 2019 (in thousands) Interest Rate Financing Available Borrowing Outstanding Deferred Debt Issuance Cost Outstanding Borrowings, net Broker-dealer credit facilities: Uncommitted facility 3.38% $ 200,000 $ 20,000 $ (1,477 ) $ 18,523 Committed facility 3.65% 600,000 72,000 (2,793 ) 69,207 $ 800,000 $ 92,000 $ (4,270 ) $ 87,730 At December 31, 2018 (in thousands) Interest Rate Financing Available Borrowing Outstanding Deferred Debt Issuance Cost Outstanding Borrowings, net Broker-dealer credit facilities: Uncommitted facility 3.40% $ 200,000 $ 10,000 $ (832 ) $ 9,168 Committed facility 3.75% 500,000 7,000 (1,040 ) 5,960 $ 700,000 $ 17,000 $ (1,872 ) $ 15,128 The following summarizes interest expense for the broker-dealer facilities. Interest expense is included within Interest and dividends expense in the accompanying condensed consolidated statements of comprehensive income. Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Broker-dealer credit facilities: Uncommitted facility $ 177 $ 584 $ 361 $ 1,030 Committed facility 181 54 254 152 $ 358 $ 638 $ 615 $ 1,182 Short-Term Credit Facilities The Company maintains short-term credit facilities with various prime brokers and other financial institutions from which it receives execution or clearing services. The proceeds of these facilities are used to meet margin requirements associated with the products traded by the Company in the ordinary course, and amounts borrowed are collateralized by the Company’s trading accounts with the applicable financial institution. At June 30, 2019 Weighted Average Financing Borrowing Short-Term Credit Facilities: Short-term credit facilities (1) 4.93% $ 566,000 $ 156,894 $ 566,000 $ 156,894 At December 31, 2018 Weighted Average Interest Rate Financing Available Borrowing Outstanding Short-Term Credit Facilities: Short-term credit facilities (1) 5.03% $ 566,000 $ 184,608 $ 566,000 $ 184,608 (1) Outstanding borrowings are included with Receivables from/ Payables to broker-dealers and clearing organizations within the condensed consolidated statements of financial condition. Interest expense in relation to the facilities was approximately $1.8 million and $1.9 million for the three months ended June 30, 2019 and 2018 , respectively, and $3.7 million and $3.4 million for the six months ended June 30, 2019 and 2018 , respectively. Short-Term Bank Loans The Company’s international securities clearance and settlement activities are funded with operating cash or with short-term bank loans in the form of overdraft facilities. At June 30, 2019 , there was $59.5 million outstanding under these facilities at a weighted average interest rate of approximately 2.7% associated with international settlement activities. Long-Term Borrowings The following summarizes the Company’s long-term borrowings, net of unamortized discount and debt issuance costs, where applicable: At June 30, 2019 (in thousands) Maturity Interest Outstanding Principal Discount Deferred Debt Issuance Cost Outstanding Borrowings, net Long-term borrowings: First Lien Term Loan Facility March 2026 6.04% $ 1,450,000 $ (6,904 ) $ (28,489 ) $ 1,414,607 Senior Secured Second Lien Notes June 2022 6.75% 500,000 — (15,236 ) 484,764 SBI bonds January 2020 5.00% 32,452 — (12 ) 32,440 $ 1,982,452 $ (6,904 ) $ (43,737 ) $ 1,931,811 At December 31, 2018 (in thousands) Maturity Date Interest Rate Outstanding Principal Discount Deferred Debt Issuance Cost Outstanding Borrowings, net Long-term borrowings: Fourth Amended and Restated Credit Facility December 2021 5.55% $ 400,000 $ (332 ) $ (6,704 ) $ 392,964 Senior Secured Second Lien Notes June 2022 6.75% 500,000 — (17,811 ) 482,189 SBI bonds January 2020 5.00% 31,908 — (24 ) 31,884 $ 931,908 $ (332 ) $ (24,539 ) $ 907,037 Credit Agreement As described in Note 3 “ITG Acquisition” , in connection with the ITG Acquisition, Virtu Financial, VFH and the Acquisition Borrower entered into the Credit Agreement, with the lenders party thereto, Jefferies Finance LLC, as administrative agent and Jefferies Finance LLC and RBC Capital Markets, as joint lead arrangers and joint bookrunners. The Credit Agreement provides (i) a senior secured first lien term loan (the “First Lien Term Loan Facility”) in an aggregate principal amount of $1,500 million , drawn in its entirety on the ITG Closing Date, with approximately $404.5 million borrowed by VFH to repay all amounts outstanding under the Existing Term Loan Facility (as defined below) and the remaining approximately $1,095 million borrowed by the Acquisition Borrower to finance the consideration and fees and expenses paid in connection with the ITG Acquisition, and (ii) a $50.0 million senior secured first lien revolving facility to VFH (the “First Lien Revolving Facility”), with a $5.0 million letter of credit subfacility and a $5.0 million swingline subfacility. After the ITG Closing Date, VFH assumed the obligations of the Acquisition Borrower in respect of the acquisition term loans. During the three months ended June 30, 2019, $50.0 million was repaid under the First Lien Term Loan Facility. As of June 30, 2019 , $1,450 million was outstanding under the First Lien Term Loan Facility. The term loan borrowings and revolver borrowings under the Credit Agreement will bear interest at a per annum rate equal to, at the Company's election, either (i) the greatest of (a) the prime rate in effect, (b) the greater of (1) the federal funds effective rate and (2) the overnight bank funding rate, in each case plus 0.5% , (c) an adjusted LIBOR rate for a Eurodollar borrowing with an interest period of one month plus 1% and (d) 1.00% , plus, in each case, 2.50% , with a stepdown to 2.25% based on VFH’s first lien leverage ratio, or (ii) the greater of (x) an adjusted LIBOR rate for the interest period in effect and (y) 0% , plus, in each case, 3.50% , with a stepdown to 3.25% based on VFH’s first lien leverage ratio. In addition, a commitment fee accrues at a rate of 0.50% per annum on the average daily unused amount of the First Lien Revolving Facility, with stepdowns to 0.375% and 0.25% per annum based on VFH’s first lien leverage ratio, and is payable quarterly in arrears. The First Lien Revolving Facility under the Credit Agreement is subject to a springing net first lien leverage ratio which may spring into effect as of the last day of a fiscal quarter based on the usage of the aggregate revolving commitments as of such date. VFH is also subject to contingent principal prepayments based on excess cash flow and certain other triggering events. Borrowings under the Credit Agreement are guaranteed by Virtu Financial and VFH’s material non-regulated restricted subsidiaries and secured by substantially all of the assets of VFH and the guarantors, in each case, subject to certain exceptions. Under the Credit Agreement, term loans will mature on March 1, 2026; provided that unless at least $400 million of VFH’s existing 6.750% second lien notes due 2022 have been repaid or refinanced (the “repayment requirement”) prior to the date that is 91 days prior to the maturity of the second lien notes (the “term springing maturity date”), the term loans will mature on the term springing maturity date. The term loans amortize in annual installments equal to 1.0% of the original aggregate principal amount of the term loans. The revolving commitments will terminate on March 1, 2022; provided that unless the repayment requirement is satisfied on or prior to the date that is 182 days prior to the maturity of the second lien notes (the “revolving springing maturity date”), the revolving commitments will terminate on the revolving springing maturity date. The Credit Agreement contains certain customary covenants and certain customary events of default, including relating to a change of control. If an event of default occurs and is continuing, the lenders under the Credit Agreement will be entitled to take various actions, including the acceleration of amounts outstanding under the Credit Agreement and all actions permitted to be taken by a secured creditor in respect of the collateral securing the obligations under the Credit Agreement. To finance the Acquisition of KCG, on June 30, 2017, Virtu Financial and VFH previously entered into the Fourth Amended and Restated Credit Agreement which, upon the closing of the Acquisition of KCG, provided for an aggregate $1.15 billion of first lien secured term loans (the “Existing Term Loan Facility”). As described above, the Existing Term Loan Facility was fully terminated following its repayment in full with the proceeds of the First Lien Term Loan Facility. Senior Secured Second Lien Notes To finance the Acquisition of KCG, on June 16, 2017, Orchestra Borrower LLC (the “Escrow Issuer”), a wholly owned subsidiary of Virtu Financial, and Orchestra Co-Issuer, Inc. (the “Co-Issuer”) completed the offering of $500.0 million aggregate principal amount of 6.750% Senior Secured Second Lien Notes due 2022 (the “Notes”). The Notes were issued under an Indenture, dated June 16, 2017 (the “Indenture”), among the Escrow Issuer, the Co-Issuer and U.S. Bank National Association, as trustee and collateral agent. The Notes mature on June 15, 2022. On July 20, 2017, VFH assumed all of the obligations of the Escrow Issuer under the Indenture and the Notes. The Notes are guaranteed by Virtu Financial and each of Virtu Financial’s wholly-owned domestic restricted subsidiaries that guarantees the Credit Agreement. The Indenture imposes certain limitations on the Company, and contains certain customary events of default, including, among others, payment defaults related to the failure to pay principal or interest on the Notes, covenant defaults, final maturity default or cross-acceleration with respect to material indebtedness and certain bankruptcy events. The gross proceeds from the Notes were deposited into a segregated escrow account with an escrow agent. The proceeds were released from escrow as of the KCG Closing Date and were used to finance, in part, the Acquisition of KCG, and to repay certain indebtedness of the Company and KCG. SBI Bonds On July 25, 2016, VFH issued Japanese Yen Bonds (collectively the “SBI Bonds”) in the aggregate principal amount of ¥3.5 billion ( $33.1 million at issuance date) to SBI Life Insurance Co., Ltd. and SBI Insurance Co., Ltd. The proceeds from the SBI Bonds were used to partially fund the investment in SBI (as described in Note 11 “Financial Assets and Liabilities” ). The SBI Bonds are guaranteed by Virtu Financial. The SBI Bonds are subject to fluctuations on the Japanese Yen currency rates relative to the Company’s reporting currency (U.S. Dollar) with the changes reflected in other, net in the condensed consolidated statements of comprehensive income. The principal balance was ¥3.5 billion ( $32.5 million ) as of June 30, 2019 and ¥3.5 billion ( $31.9 million ) as of December 31, 2018 . The Company recorded a gain of $0.9 million and a gain of $1.4 million due to the change in currency rates during the three months ended June 30, 2019 and 2018 , respectively, and a gain of $0.5 million and a loss of $0.5 million during the six months ended June 30, 2019 and 2018 , respectively. As of June 30, 2019 , aggregate future required minimum principal payments based on the terms of the long-term borrowings were as follows: (in thousands) June 30, 2019 2019 $ — 2020 47,452 2021 15,000 2022 515,000 2023 and thereafter 1,405,000 Total principal of long-term borrowings $ 1,982,452

Financial Assets and Liabilitie

Financial Assets and Liabilities	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities	Financial Assets and Liabilities Financial Instruments Measured at Fair Value The fair value of equities, options, on-the-run U.S. government obligations and exchange traded notes is estimated using recently executed transactions and market price quotations in active markets and are categorized as Level 1 with the exception of inactively traded equities and certain other financial instruments, which are categorized as Level 2. The Company’s corporate bonds, derivative contracts and other U.S. and non-U.S. government obligations have been categorized as Level 2. Fair value of the Company’s derivative contracts is based on the indicative prices obtained from a number of banks and broker-dealers, as well as management’s own analyses. The indicative prices have been independently validated through the Company’s risk management systems, which are designed to check prices with information independently obtained from exchanges and venues where such financial instruments are listed or to compare prices of similar instruments with similar maturities for listed financial futures in foreign exchange. The Company prices certain financial instruments held for trading at fair value based on theoretical prices, which can differ from quoted market prices. The theoretical prices reflect price adjustments primarily caused by the fact that the Company continuously prices its financial instruments based on all available information. This information includes prices for identical and near-identical positions, as well as the prices for securities underlying the Company’s positions, on other exchanges that are open after the exchange on which the financial instruments is traded closes. The Company validates that all price adjustments can be substantiated with market inputs and checks the theoretical prices independently. Consequently, such financial instruments are classified as Level 2. There were no transfers of financial instruments between levels during the three and six months ended June 30, 2019 and 2018 . Fair value measurements for those items measured on a recurring basis are summarized below as of June 30, 2019 : June 30, 2019 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Counterparty and Cash Collateral Netting Total Fair Value Assets Financial instruments owned, at fair value: Equity securities $ 864,371 $ 1,338,106 $ — $ — $ 2,202,477 U.S. and Non-U.S. government obligations 68,114 14,716 — — 82,830 Corporate Bonds — 104,667 — — 104,667 Exchange traded notes 184 18,328 — — 18,512 Currency forwards — 2,407,155 — (2,384,305 ) 22,850 Options 3,665 — — — 3,665 936,334 3,882,972 — (2,384,305 ) 2,435,001 Financial instruments owned, pledged as collateral: Equity securities 308,315 310,392 — — 618,707 Exchange traded notes 11 51,283 — — 51,294 308,326 361,675 — — 670,001 Other Assets Equity investment — — 46,351 — 46,351 Exchange stock 2,848 — — — 2,848 2,848 — 46,351 — 49,199 Liabilities Financial instruments sold, not yet purchased, at fair value: Equity securities 1,307,307 1,150,367 — — 2,457,674 U.S. and Non-U.S. government obligations 52,658 2,905 — — 55,563 Corporate Bonds — 170,432 — — 170,432 Exchange traded notes 104 17,807 — — 17,911 Currency forwards — 2,402,231 — (2,390,972 ) 11,259 Options 3,579 — — — 3,579 $ 1,363,648 $ 3,743,742 $ — $ (2,390,972 ) $ 2,716,418 Fair value measurements for those items measured on a recurring basis are summarized below as of December 31, 2018 : December 31, 2018 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Counterparty and Cash Collateral Netting Total Fair Value Assets Financial instruments owned, at fair value: Equity securities $ 587,680 $ 1,022,221 $ — $ — $ 1,609,901 U.S. and Non-U.S. government obligations 91,466 14,547 — — 106,013 Corporate Bonds — 87,500 — — 87,500 Exchange traded notes 3,396 27,966 — — 31,362 Currency forwards — 2,792,373 — (2,790,242 ) 2,131 Options 11,899 — — — 11,899 694,441 3,944,607 — (2,790,242 ) 1,848,806 Financial instruments owned, pledged as collateral: Equity securities 389,810 359,036 — — 748,846 U.S. and Non-U.S. government obligations — — — — — Exchange traded notes 6,968 35,301 — — 42,269 396,778 394,337 — — 791,115 Other Assets Equity investment — — 45,856 — 45,856 Exchange stock 2,417 — — — 2,417 2,417 — 45,856 — 48,273 Liabilities Financial instruments sold, not yet purchased, at fair value: Equity securities 931,992 1,336,338 — — 2,268,330 U.S. and Non-U.S. government obligations 112,058 3,054 — — 115,112 Corporate Bonds — 40,123 — — 40,123 Exchange traded notes 371 39,613 — — 39,984 Currency forwards — 2,720,749 — (2,719,954 ) 795 Options 11,051 — — — 11,051 $ 1,055,472 $ 4,139,877 $ — $ (2,719,954 ) $ 2,475,395 SBI Investment The Company has a minority investment (the “SBI Investment”) in SBI Japannext Co., Ltd. (“SBI”), a proprietary trading system based in Tokyo. In connection with the SBI Investment, the Company issued the SBI Bonds (as described in Note 10 “Borrowings” ) and used the proceeds to partially finance the transaction. As of June 30, 2019 , the fair value of the SBI Investment was determined using the discounted cash flow method, an income approach, with the discount rate of 15.0% applied to the cash flow forecasts. The Company also used a market approach based on 12.6 x average price/earnings multiples of comparable companies to corroborate the income approach. The fair value of the SBI Investment at June 30, 2019 was determined by taking the weighted average of enterprise valuations based on discounted cash flow on projected income from the next five years , the implied enterprise valuations on comparable companies, and the implied enterprise valuations on comparable transactions. The fair value measurement is highly sensitive to significant changes in the unobservable inputs and significant increases (decreases) in discount rate or decreases (increases) in price/earnings multiples would result in a significantly lower (higher) fair value measurement. Changes in the fair value of the SBI Investment are reflected in Other, net in the condensed consolidated statements of comprehensive income. Financial Instruments Not Measured at Fair Value The table below presents the carrying value, fair value and fair value hierarchy category of certain financial instruments that are not measured at fair value on the condensed consolidated statement of financial condition. The table below excludes non-financial assets and liabilities. The carrying value of financial instruments not measured at fair value categorized in the fair value hierarchy as Level 1 and Level 2 approximates fair value due to the relatively short-term nature of the underlying assets. The fair value of the Company’s long-term borrowings is based on quoted prices from the market for similar instruments, and is categorized as Level 2 in the fair value hierarchy. The table below summarizes financial assets and liabilities not carried at fair value on a recurring basis as of June 30, 2019 : June 30, 2019 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Carrying Value Fair Value (Level 1) (Level 2) (Level 3) Assets Cash and cash equivalents $ 458,064 $ 458,064 $ 458,064 $ — $ — Cash restricted or segregated under regulations and other 39,497 39,497 39,497 — — Securities borrowed 1,201,327 1,201,327 — 1,201,327 — Securities purchased under agreements to resell 22,974 22,974 — 22,974 — Receivables from broker-dealers and clearing organizations 1,287,091 1,287,091 39,394 1,247,697 — Total Assets 3,008,953 3,008,953 536,955 2,471,998 — Liabilities Short-term borrowings 146,847 146,847 — 146,847 — Long-term borrowings 1,931,811 2,003,866 — 2,003,866 — Securities loaned 778,351 778,351 — 778,351 — Securities sold under agreements to repurchase 295,803 295,803 — 295,803 — Payables to broker-dealers and clearing organizations 668,545 668,545 15,876 652,669 — Total Liabilities $ 3,821,357 $ 3,893,412 $ 15,876 $ 3,877,536 $ — The table below summarizes financial assets and liabilities not carried at fair value on a recurring basis as of December 31, 2018 : December 31, 2018 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Carrying Value Fair Value (Level 1) (Level 2) (Level 3) Assets Cash and cash equivalents $ 736,047 $ 736,047 $ 736,047 $ — $ — Securities borrowed 1,399,684 1,399,684 — 1,399,684 — Securities purchased under agreements to resell 15,475 15,475 — 15,475 — Receivables from broker-dealers and clearing organizations 1,101,449 1,101,449 71,288 1,030,161 — Total Assets 3,252,655 3,252,655 807,335 2,445,320 — Liabilities Short-term borrowings 15,128 15,128 — 15,128 — Long-term borrowings 907,037 916,465 — 916,465 — Securities loaned 1,130,039 1,130,039 — 1,130,039 — Securities sold under agreements to repurchase 281,861 281,861 — 281,861 — Payables to broker dealer and clearing organizations 567,441 567,441 1,031 566,410 — Total Liabilities $ 2,901,506 $ 2,910,934 $ 1,031 $ 2,909,903 $ — The following presents the changes in Level 3 financial instruments measured at fair value on a recurring basis: Six Months Ended June 30, 2019 (in thousands) Balance at December 31, 2018 Purchases Total Realized and Unrealized Gains / (Losses) Net Transfers into (out of) Level 3 Settlement Balance at June 30, 2019 Change in Net Unrealized Gains / (Losses) on Investments still held at June 30, 2019 Assets Other assets: Equity investment $ 45,856 $ — $ 495 $ — $ — $ 46,351 $ 495 Total 45,856 — 495 — — 46,351 495 Six Months Ended June 30, 2018 (in thousands) Balance at December 31, 2017 Purchases Total Realized and Unrealized Gains / (Losses) Net Transfers into (out of) Level 3 Settlement Balance at June 30, 2018 Change in Net Unrealized Gains / (Losses) on Investments still held at June 30, 2018 Assets Other assets: Equity investment $ 40,588 $ — $ 505 $ — $ — $ 41,093 $ 505 Total 40,588 — 505 — — 41,093 505 Offsetting of Financial Assets and Liabilities The Company does not net securities borrowed and securities loaned, or securities purchased under agreements to resell and securities sold under agreements to repurchase. These financial instruments are presented on a gross basis in the condensed consolidated statements of financial condition. In the tables below, the amounts of financial instruments owned that are not offset in the condensed consolidated statements of financial condition, but could be netted against financial liabilities with specific counterparties under legally enforceable master netting agreements in the event of default, are presented to provide financial statement readers with the Company’s estimate of its net exposure to counterparties for these financial instruments. The following tables set forth the gross and net presentation of certain financial assets and financial liabilities as of June 30, 2019 and December 31, 2018 : June 30, 2019 Gross Amounts of Recognized Assets Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition (in thousands) Financial Instruments Cash Collateral Received Net Amount Offsetting of Financial Assets: Securities borrowed $ 1,201,327 $ — $ 1,201,327 $ (1,173,186 ) $ (1,691 ) $ 26,450 Securities purchased under agreements to resell 22,974 — 22,974 (22,974 ) — — Trading assets, at fair value: Currency forwards 2,407,155 (2,384,305 ) 22,850 — — 22,850 Options 3,665 — 3,665 (3,665 ) — — Total $ 3,635,121 $ (2,384,305 ) $ 1,250,816 $ (1,199,825 ) $ (1,691 ) $ 49,300 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition (in thousands) Financial Instruments Cash Collateral Pledged Net Amount Offsetting of Financial Liabilities: Securities loaned $ 778,351 $ — $ 778,351 $ (728,309 ) $ (6,644 ) $ 43,398 Securities sold under agreements to repurchase 295,803 — 295,803 (295,803 ) — — Trading liabilities, at fair value: Currency forwards 2,402,231 (2,390,972 ) 11,259 — — 11,259 Options 3,579 — 3,579 (3,579 ) — — Total $ 3,479,964 $ (2,390,972 ) $ 1,088,992 $ (1,027,691 ) $ (6,644 ) $ 54,657 December 31, 2018 Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Statement of Financial Condition Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition Gross Amounts Not Offset in the Consolidated Statement of Financial Condition (in thousands) Financial Instruments Cash Collateral Received Net Amount Offsetting of Financial Assets: Securities borrowed $ 1,399,684 $ — $ 1,399,684 $ (1,361,635 ) $ (8,822 ) $ 29,227 Securities purchased under agreements to resell 15,475 — 15,475 (15,475 ) — — Trading assets, at fair value: Currency forwards 2,792,373 (2,790,242 ) 2,131 — — 2,131 Options 11,899 — 11,899 (11,899 ) — — Total $ 4,219,431 $ (2,790,242 ) $ 1,429,189 $ (1,389,009 ) $ (8,822 ) $ 31,358 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Statement of Financial Condition Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition Gross Amounts Not Offset in the Consolidated Statement of Financial Condition (in thousands) Financial Instruments Cash Collateral Pledged Net Amount Offsetting of Financial Liabilities: Securities loaned $ 1,130,039 $ — $ 1,130,039 $ (1,108,461 ) $ (8,822 ) $ 12,756 Securities sold under agreements to repurchase 281,861 — 281,861 (281,861 ) — — Trading liabilities, at fair value: Currency forwards 2,720,749 (2,719,954 ) 795 — (792 ) 3 Options 11,051 — 11,051 (11,051 ) — — Total $ 4,143,700 $ (2,719,954 ) $ 1,423,746 $ (1,401,373 ) $ (9,614 ) $ 12,759 The following table presents gross obligations for securities sold under agreements to repurchase and for securities lending transactions by remaining contractual maturity and the class of collateral pledged: June 30, 2019 Remaining Contractual Maturity (in thousands) Overnight and Continuous Less than 30 days 30 - 60 days 61 - 90 Days Total Securities sold under agreements to repurchase: Equity securities $ — $ 65,000 $ 65,000 $ 160,000 $ 290,000 U.S. and Non-U.S. government obligations 5,803 — — — 5,803 Total 5,803 65,000 65,000 160,000 295,803 Securities lending transactions: Equity securities 778,351 — — — 778,351 Total $ 778,351 $ — $ — $ — $ 778,351 December 31, 2018 Remaining Contractual Maturity (in thousands) Overnight and Continuous Less than 30 days 30 - 60 days 61 - 90 Days Total Securities sold under agreements to repurchase: Equity securities $ — $ 45,000 $ 65,000 $ 160,000 $ 270,000 U.S. and Non-U.S. government obligations 11,861 — — — 11,861 Total 11,861 45,000 65,000 160,000 281,861 Securities loaned: Equity securities 1,130,039 — — — 1,130,039 Total $ 1,130,039 $ — $ — $ — $ 1,130,039

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments The fair value of the Company’s derivative instruments on a gross basis consisted of the following at June 30, 2019 and December 31, 2018 : (in thousands) June 30, 2019 December 31, 2018 Derivatives Assets Financial Statements Location Fair Value Notional Fair Value Notional Derivative instruments not designated as hedging instruments: Equities futures Receivables from broker-dealers and clearing organizations $ 1,426 $ 2,902,864 $ (15,382 ) $ 2,891,606 Commodity futures Receivables from broker-dealers and clearing organizations 39,317 9,777,946 69,235 11,595,215 Currency futures Receivables from broker-dealers and clearing organizations (36 ) 2,401,655 (9,432 ) 3,756,914 Fixed income futures Receivables from broker-dealers and clearing organizations 3 553 (28 ) 18,694 Options Financial instruments owned 3,665 296,807 11,899 659,101 Currency forwards Financial instruments owned 2,407,155 174,182,937 2,792,373 171,288,432 Derivatives Liabilities Financial Statements Location Fair Value Notional Fair Value Notional Derivative instruments not designated as hedging instruments: Equities futures Payables to broker-dealers and clearing organizations $ (302 ) $ 160,909 $ 468 $ 106,487 Commodity futures Payables to broker-dealers and clearing organizations (11,522 ) 5,129,312 (375 ) 54,782 Currency futures Payables to broker-dealers and clearing organizations (4,790 ) 2,543,167 (30,643 ) 6,239,725 Fixed income futures Payables to broker-dealers and clearing organizations — — 93 8,591 Options Financial instruments sold, not yet purchased 3,579 310,548 11,051 608,756 Currency forwards Financial instruments sold, not yet purchased 2,402,231 174,180,475 2,720,749 171,252,224 Derivative instruments designated as hedging instruments: Currency forwards Financial instruments sold, not yet purchased — — (792 ) 13,501 Amounts included in receivables from and payables to broker-dealers and clearing organizations represent net variation margin on long and short futures contracts. The following table summarizes the net gain from derivative instruments not designated as hedging instruments under ASC 815, which are recorded in trading income, net, and from those designated as hedging instruments under ASC 815, which are recorded in accumulated other comprehensive income in the accompanying condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2019 and 2018 . Three Months Ended June 30, Six Months Ended June 30, (in thousands) Financial Statements Location 2019 2018 2019 2018 Derivative instruments not designated as hedging instruments: Futures Trading income, net $ 83,225 $ 6,909 $ 155,610 $ (429,506 ) Currency forwards Trading income, net (20,869 ) 110,828 (45,042 ) 196,588 Options Trading income, net 4,335 (9,837 ) 4,997 (8,736 ) $ 66,691 $ 107,900 $ 115,565 $ (241,654 ) Derivative instruments designated as hedging instruments: Foreign exchange - forward contract Accumulated other comprehensive income $ — $ 6 $ — $ 156

Revenues from Contracts with Cu

Revenues from Contracts with Customers	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenues from Contracts with Customers	Revenues from Contracts with Customers Revenue Recognition The Company adopted ASC Topic 606, Revenue from Contracts with Customers as of January 1, 2018 in the condensed consolidated financial statements by applying the modified retrospective method. The Company’s revenue recognition methods for its contracts with customers prior to the adoption of Topic 606 are consistent with its methods after the adoption of Topic 606. Accordingly, the adoption of the new standard did not result in a transition adjustment to opening retained earnings, and as a result, revenues for contracts with customers would not have been adjusted in prior periods and are not presented herein on an adjusted basis. As a result of the ITG Acquisition, subsequent to the ITG Closing Date, the Company has additional revenue streams as described below. The new revenue guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other U.S. GAAP, and as a result, did not have an impact on the market making elements of the Company’s condensed consolidated statement of comprehensive income most closely associated with financial instruments, including trading income, net and interest and dividend income. The new standard primarily impacts the presentation of the Company's Execution Services revenue streams discussed below, all of which are presented within Commissions, net and technology services on the Company’s condensed consolidated statements of comprehensive income. Commissions, net . The Company earns commission revenue by acting as an agent on behalf of customers. The Company’s performance obligations consist of trade execution and clearing services and are satisfied on the trade date; accordingly, commission revenues are recorded on the trade date. Commission revenues are paid on settlement date; therefore, a receivable is recognized as of the trade date. Under a commission management program, the Company allows institutional clients to allocate a portion of their gross commissions to pay for research and other services provided by third parties. As the Company acts as an agent in these transactions, it records such expenses on a net basis within Commissions, net and technology services in the condensed consolidated statements of comprehensive income. Technology services. The Company’s technology services revenues consist of technology licensing fees and agency commission fees. Technology licensing fees are earned from third parties for licensing of the Company’s proprietary risk management and trading infrastructure technology and the provision of associated management and hosting services. These fees include both upfront and annual recurring fees as well as, in certain cases, contingent fees based on customer revenues, which represent variable consideration. The services offered under these contracts are delivered as an integrated package and are interdependent and have the same pattern of transfer to the customer; accordingly, the Company measures and recognizes them as a single performance obligation. The performance obligation is satisfied over time, and, therefore, revenue is recognized as time passes. Variable consideration has not been included in the transaction price as the amount of consideration is contingent on factors outside the Company’s control and thus it is not probable that a significant reversal of cumulative revenue recognized will not occur. Recurring fees, which exclude variable consideration, are billed and collected on a quarterly basis and are included within Receivables from broker-dealers and clearing organizations. Workflow technology. Through its front-end workflow solutions and network capabilities, the Company provides order and trade execution management and order routing services. The Company provides trade order routing from its execution management system (“EMS”) to its execution services offerings, with each trade order routed through the EMS representing a separate performance obligation that is satisfied at a point in time. Commissions earned are fixed and revenue is recognized on the trade date. A portion of the commissions earned on the trade is then allocated to workflow technology based on the stand-alone selling price paid by third-party brokers for order routing. The remaining commission is allocated to commissions, net using a residual allocation approach. The Company participates in commission share arrangements, where trade orders are routed to third-party brokers from its EMS and its order management system (“OMS”). Commission share revenues from third-party brokers are generally fixed and revenue is recognized at a point in time on the trade date. The Company provides OMS and related software products and connectivity services to customers and recognizes license fee revenues and monthly connectivity fees. License fee revenues, generated for the use of the Company’s OMS and other software products, is fixed and recognized at the point in time at which the customer is able to use and benefit from the license. Connectivity revenue is variable in nature, based on the number of live connections, and is recognized over time on a monthly basis using a time-based measure of progress. Analytics. The Company provides customers with analytics products and services, including trading and portfolio analytics tools. The Company provides analytics products and services to customers and recognizes subscription fees, which are fixed for the contract term, based on when the products and services are delivered. Analytics services can be delivered either over time (when customers are provided with distinct ongoing access to analytics data) or at a point in time (when reports are only delivered to the customer on a periodic basis). Over time performance obligations are recognized using a time-based measure of progress on a monthly basis, since the analytics products and services are continually provided to the client. Point in time performance obligations are recognized when the analytics reports are delivered to the client. Analytics products and services can also be paid for through variable bundled arrangements with trade execution services. Customers agree to pay for analytics products and services with commissions generated from trade execution services, and commissions are allocated to the analytics performance obligation(s) using: (i) the commission value for each customer for the products and services it receives, which is priced using the value for similar stand-alone subscription arrangements; and (ii) a calculated ratio of the commission value for the products and services relative to the total amount of commissions generated from the customer. For these bundled commission arrangements, the allocated commissions to each analytics performance obligation are then recognized as revenue when the analytics product is delivered, either over time or at a point in time. These allocated commissions may be deferred if the allocated amount exceeds the amount recognizable based on delivery. Disaggregation of Revenues The following tables present the Company’s revenue from contracts with customers disaggregated by the services described above, by timing of revenue recognition, reconciled to the Company’s segments, for the three and six months ended June 30, 2019 : Three Months Ended June 30, 2019 (in thousands) Market Making Execution Services Corporate Total Revenues from contracts with customers: Commissions, net $ 4,961 $ 103,727 $ — $ 108,688 Workflow technology — 25,455 — 25,455 Analytics — 10,977 — 10,977 Total revenue from contracts with customers 4,961 140,159 — 145,120 Other sources of revenue 230,043 1,865 1,428 233,336 Total Revenues 235,004 142,024 1,428 378,456 Timing of revenue recognition: Services transferred at a point in time 235,004 121,763 1,428 358,195 Services transferred over time — 20,261 — 20,261 Total Revenues $ 235,004 $ 142,024 $ 1,428 $ 378,456 Six Months Ended June 30, 2019 (in thousands) Market Making Execution Services Corporate Total Revenues from contracts with customers: Commissions, net $ 9,961 $ 161,482 $ — $ 171,443 Workflow technology — 34,327 — 34,327 Analytics — 14,497 — 14,497 Total revenue from contracts with customers 9,961 210,306 — 220,267 Other sources of revenue 504,264 15,236 1,681 521,181 Total revenues 514,225 225,542 1,681 741,448 Timing of revenue recognition: Services transferred at a point in time 514,225 198,492 1,681 714,398 Services transferred over time — 27,050 — 27,050 Total revenues $ 514,225 $ 225,542 $ 1,681 $ 741,448 Remaining Performance Obligations and Revenue Recognized from Past Performance Obligations As of June 30, 2019 , the aggregate amount of the transaction price allocated to the performance obligations relating to technology services, workflow technology, and analytics revenues that are unsatisfied (or partially unsatisfied) was not material. For the three and six months ended June 30, 2019 , the Company recognized $0.5 million of revenue related to performance obligations satisfied in previous periods. Contract Assets and Contract Liabilities The timing of the revenue recognition may differ from the timing of payment from customers. The Company records a receivable when revenue is recognized prior to payment, and when the Company has an unconditional right to payment. The Company records a contract liability when payment is received prior to the time at which the satisfaction of the service obligation occurs. Receivables related to revenues from contracts with customers amounted to $57.0 million and $1.7 million as of June 30, 2019 and December 31, 2018 , respectively. The Company did not identify any contract assets. There were no impairment losses on receivables as of June 30, 2019 . Deferred revenue primarily relates to deferred commissions allocated to analytics products and subscription fees billed in advance of satisfying the performance obligations. Deferred revenue related to contracts with customers was $11.9 million as of June 30, 2019 . During the three and six months ended June 30, 2019 , the Company recognized revenue of $7.8 million and $14.9 million , respectively, that was initially recorded as deferred revenue. The Company has not identified any costs to obtain or fulfill associated with its contracts under ASC 606.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is subject to U.S. federal, state and local income tax at the rate applicable to corporations less the rate attributable to the noncontrolling interest in Virtu Financial. These noncontrolling interests are subject to U.S. taxation as partnerships. Accordingly, for the three months ended June 30, 2019 and 2018 , the income attributable to these noncontrolling interests is reported in the condensed consolidated statements of comprehensive income, but the related U.S. income tax expense attributable to these noncontrolling interests is not reported by the Company as it is the obligation of the individual partners. The Company’s provisions for (benefits from) income taxes and effective tax rates were $(11.1) million and 16.7% , and $3.0 million and 6.0% , for the three months ended June 30, 2019 and 2018 , respectively, and $(13.7) million and 16.5% , and $61.5 million and 13.1% for the six months ended June 30, 2019 and 2018 , respectively. Income tax expense is also affected by the differing effective tax rates in foreign, state and local jurisdictions where certain of the Company’s subsidiaries are subject to corporate taxation. Included in Other assets on the condensed consolidated statements of financial condition at June 30, 2019 and December 31, 2018 are current income tax receivables of $62.6 million and $41.1 million , respectively. The balances at June 30, 2019 and December 31, 2018 primarily comprise income tax benefits due to the Company from federal, state and local, and foreign tax jurisdictions based on income before taxes. Included in Accounts payable, accrued expenses and other liabilities on the condensed consolidated statements of financial condition at June 30, 2019 and December 31, 2018 are current tax liabilities of $13.6 million and $10.0 million , respectively. The balances at June 30, 2019 and December 31, 2018 primarily comprise income taxes owed to federal, state and local, and foreign tax jurisdictions based on income before taxes. Deferred income taxes arise primarily due to the amortization of the deferred tax assets recognized in connection with the IPO (see Note 6 “Tax Receivable Agreements” ), the Acquisition of KCG and the ITG Acquisition (see Note 3 “ITG Acquisition” ), differences in the valuation of financial assets and liabilities, and other temporary differences arising from the deductibility of compensation, depreciation, and other expenses in different time periods for book and income tax return purposes. There are no expiration dates on the deferred tax assets. The provisions of ASC 740 require that carrying amounts of deferred tax assets be reduced by a valuation allowance if, based on the available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Accordingly, the need to establish valuation allowances for deferred tax assets is assessed periodically with appropriate consideration given to all positive and negative evidence related to the realization of the deferred tax assets. As a result of the Acquisition of KCG, the Company has non-U.S. net operating losses at June 30, 2019 and December 31, 2018 of $239.3 million and $239.3 million , respectively, and has recorded a related deferred tax asset of $44.9 million and $44.9 million , respectively. A full valuation allowance was also recorded against this deferred tax asset at June 30, 2019 and December 31, 2018 as it is more likely than not that this deferred tax asset will not be realized. No valuation allowance against the remaining deferred taxes was recorded as of June 30, 2019 and December 31, 2018 because it is more likely than not that these deferred tax assets will be fully realized. The Company is subject to taxation in U.S. federal, state, local and foreign jurisdictions. As of June 30, 2019 , the Company’s tax years for 2013 through 2017 and 2010 through 2017 are subject to examination by U.S. and non-U.S. tax authorities, respectively. As a result of the ITG Acquisition and the Acquisition of KCG, the Company has assumed any ITG and KCG tax exposures. In addition, the Company is subject to state and local income tax examinations in various jurisdictions for the tax years 2013 through 2017. The final outcome of these examinations is not yet determinable. However, the Company anticipates that adjustments to the unrecognized tax benefits, if any, will not result in a material change to the financial condition, results of operations and cash flows. The Company’s policy for recording interest and penalties associated with audits is to record such items as a component of income or loss before income taxes and noncontrolling interest. Penalties, if any, are recorded in Operations and administrative expense and interest received or paid is recorded in Other, net or Operations and administrative expense in the condensed consolidated statement of comprehensive income. The Company had $9.2 million of unrecognized tax benefits as of June 30, 2019 , all of which would affect the Company’s effective tax rate if recognized. The Company has determined that there are no uncertain tax positions that would have a material impact on the Company’s financial position as of June 30, 2019 .

Commitments, Contingencies and

Commitments, Contingencies and Guarantees	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Guarantees	Commitments, Contingencies and Guarantees Legal Proceedings In the ordinary course of business, the nature of the Company’s business subjects it to claims, lawsuits, regulatory examinations or investigations and other proceedings. The Company and its subsidiaries are subject to several of these matters at the present time. Given the inherent difficulty of predicting the outcome of litigation and regulatory matters, particularly in regulatory examinations or investigations or other proceedings in which substantial or indeterminate judgments, settlements, disgorgements, restitution, penalties, injunctions, damages or fines are sought, or where such matters are in the early stages, the Company cannot estimate losses or ranges of losses for such matters where there is only a reasonable possibility that a loss may be incurred. In addition, there are numerous factors that result in a greater degree of complexity in class-action lawsuits as compared to other types of litigation. There can be no assurance that these legal proceedings will not have a material adverse effect on the Company’s results of operations in any future period, and a material judgment, fine or sanction could have a material adverse impact on the Company’s financial condition, results of operations and cash flows. However, it is the opinion of management, after consultation with legal counsel that, based on information currently available, the ultimate outcome of these matters will not have a material adverse impact on the business, financial condition or operating results of the Company, although they might be material to the operating results for any particular reporting period. The Company carries directors’ and officers’ liability insurance coverage and other insurance coverages for potential claims, including securities actions, against the Company and its respective directors and officers. In connection with the Acquisition of KCG, a previously filed complaint, which was initially captioned Greenway v. KCG Holdings, Inc., et al., Case No. 2017-421-JTL and filed on behalf of a putative class in Delaware Chancery Court, was recaptioned Chester County Employees’ Retirement Fund v. KCG Holdings, Inc., et al. , amended and refiled on February 14, 2018 to include claims for the alleged breach of fiduciary duties against former KCG board members, claims against each of the Company and Jefferies LLC for allegedly aiding and abetting the KCG board members’ alleged breaches of fiduciary duty and a claim against the Company and Jefferies LLC for alleged civil conspiracy. The amended complaint was again amended on July 16, 2018 with the filing of the Verified Second Amended Class Action Complaint (the “Second Amended Complaint”) to include additional factual allegations. No amount of damages is stated in the Second Amended Complaint, against which Virtu is defending itself vigorously. On January 29, 2019, the Company was named as a defendant in Ford v. ProShares Trust II, et al. , No. 19-cv-886. The complaint was filed in federal district court in New York on behalf of a putative class, and asserts claims against the Company and numerous other financial institutions under Section 11 of the Securities Act of 1933 in connection with trading in a ProShares inverse-volatility ETF. Additionally, on February 27, 2019, and March 1, 2019, the Company was named as a defendant in Bittner v. ProShares Trust II, et al. , No. 19-cv-1840, and Mareno v. ProShares Trust II , et al., No. 19-cv-1955, respectively. The complaints were filed in federal district court in New York on behalf of putative classes, and assert substantially similar claims against the Company and other financial institutions. On April 29, 2019, these three actions were consolidated in federal district court in New York as In re ProShares Trust II Securities Litigation, No. 19-cv-886-DLC. A consolidated amended complaint, which does not specify the amount of alleged damages, was filed in the consolidated action on June 21, 2019. The Company believes that the claims are without merit and intends to defend itself vigorously. As a result of the ITG Acquisition, the Company assumed potential liabilities relating to ITG’s business, including but not limited to those potential liabilities arising from or related to pending, threatened or potential litigation or regulatory matters. These matters include but not are not necessarily limited to a Statement of Claim filed on July 27, 2018 by a former employee of ITG requesting a FINRA arbitration. The former ITG employee alleges that ITG breached the non-disparagement clause in his July 2011 separation agreement and tortiously interfered with his business relations. On June 26, 2019, the former employee informed the Company that he is seeking damages of approximately $65 million (exclusive of claims for pre-judgment interest, punitive damages, costs and fees). The Company believes that the claims are without merit and is defending itself against these claims vigorously. Other Legal and Regulatory Matters The Company owns subsidiaries including regulated entities that are subject to extensive oversight under federal, state and applicable international laws as well as self-regulatory organization (“SRO”) rules. Changes in market structure and the need to remain competitive require constant changes to the Company's systems, order routing and order handling procedures. The Company makes these changes while continuously endeavoring to comply with many complex laws and rules. Compliance, surveillance and trading issues common in the securities industry are monitored by, reported to, and/or reviewed in the ordinary course of business by the Company's regulators in the U.S. and abroad. As a major order flow execution destination, the Company is named from time to time in, or is asked to respond to a number of regulatory matters brought by U.S. regulators, foreign regulators, SROs, as well as actions brought by private plaintiffs, which arise from its business activities. There has recently been an increased focus by regulators on Anti-Money Laundering and sanctions compliance by broker-dealers and similar entities, as well as an enhanced interest on suspicious activity reporting and transactions involving microcap and low-priced securities. In addition, there has been an increased focus by Congress, federal and state regulators, SROs and the media on market structure issues, and in particular, high frequency trading, best execution, internalization, alternative trading system (“ATS”) manner of operations, market fragmentation and complexity, colocation, cybersecurity, access to market data feeds and remuneration arrangements, such as payment for order flow and exchange fee structures. From time to time, the Company is the subject of requests for information and documents from the SEC, the Financial Industry Regulatory Authority and other regulators. It is the Company's practice to cooperate and comply with the requests for information and documents. The Company is currently the subject of various regulatory reviews and investigations by federal and foreign regulators and SROs, including the SEC and the Financial Industry Regulatory Authority. In some instances, these matters may result in a disciplinary action and/or a civil or administrative action. For example, in December 2015, the Autorité des Marchés Financiers (“AMF”) fined the Company’s European subsidiary in the amount of €5.0 million (approximately $5.4 million ) based on its allegations that the subsidiary of a predecessor entity engaged in price manipulation and violations of the AMF General Regulation and Euronext Market Rules. The fine was subsequently reduced in 2017 to €3.3 million (approximately $3.9 million ) and in 2018 was reduced to €3.0 million (approximately $3.4 million ). The Company has fully reserved for the monetary penalty as of June 30, 2019 and anticipates paying the fine during the year ending December 31, 2019. Representations and Warranties; Indemnification Arrangements In the normal course of its operations, the Company enters into contracts that contain a variety of representations and warranties in addition to indemnification obligations. The Company's maximum exposure under these arrangements is currently unknown, as any such exposure could relate to claims not yet brought or events which have not yet occurred. For example, in November 2013, KCG sold Urban Financial of America, LLC (“Urban”), the reverse mortgage origination and securitization business previously owned by Knight Capital Group, Inc., to an investor group now known as Finance of America Reverse, LLC (“FAR”). Pursuant to the terms of the Stock Purchase Agreement between KCG and FAR, Virtu has certain continuing obligations related to KCG's prior ownership of Urban and has been and, in the future may be, advised by FAR of potential claims thereunder. Consistent with standard business practices in the normal course of business, the Company has provided general indemnifications to its managers, officers, directors, employees, and agents against expenses, legal fees, judgments, fines, settlements, and other amounts actually and reasonably incurred by such persons under certain circumstances as more fully disclosed in its operating agreement. The overall maximum amount of the obligations (if any) cannot reasonably be estimated as it will depend on the facts and circumstances that give rise to any future claims.

Leases

Leases	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	Leases The Company adopted ASU 2016-02 on January 1, 2019, and elected the modified retrospective method of implementation. The standard requires the recognition of ROU assets and lease liabilities for leases, which are defined as a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. The Company has elected the practical expedient which allows for leases with an initial term of 12 months or less to be excluded from recognition on the condensed consolidated statement of financial condition and for which lease expense is recognized on a straight-line basis over the lease term. For the Company, Topic 842 primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. These leases are primarily for corporate office space, datacenters, and technology equipment. The leases have remaining terms of 1 year to 13 years , some of which include options to extend the initial term at the Company's discretion. The lease terms used in calculating ROU assets and lease liabilities include the options to extend the initial term when the Company is reasonably certain of exercising the options. The Company's lease agreements do not contain any material residual value guarantees, restrictions or covenants. In addition to the base rental costs, the Company’s lease agreements for corporate office space generally provide for rent escalations resulting from increased assessments for operating expenses, real estate taxes and other charges. Payments for such reimbursable expenses are considered variable and are recognized as variable lease costs in the period in which the obligation for those payments was incurred. The Company also subleases certain office space and facilities to third parties. The subleases have remaining terms of 1 to 13 years . The Company recognizes sublease income on a straight-line basis over the term of the sublease within Other, net on the condensed consolidated statement of comprehensive income. As the implied discount rate for most of the Company's leases is not readily determinable, the Company uses its incremental borrowing rate on its secured borrowings, which was based on the information available as of the initial transition date, January 1, 2019, in determining the present value of lease payments. During the three months ended June 30, 2019, the Company ceased use of certain office lease premises as part of its ongoing effort to consolidate office space. For the three and six months ended June 30, 2019, the Company recognized $65.2 million in Termination of office leases on the condensed consolidated statement of comprehensive income related to these premises, comprising $25.9 million of impairments of ROU assets, $37.9 million of write-offs of leasehold improvements and fixed assets, and $1.4 million of dilapidation charges. Lease assets and liabilities are summarized as follows: (in thousands) Financial Statement Location June 30, 2019 Operating leases Operating lease right-of-use assets Operating lease right-of-use assets $ 318,269 Operating lease liabilities Operating lease liabilities 388,070 Finance leases Property and equipment, at cost Property, equipment, and capitalized software, net 37,258 Accumulated depreciation Property, equipment, and capitalized software, net (20,139 ) Finance lease liabilities Accounts payable, accrued expenses, and other liabilities 17,566 Weighted average remaining lease term and discount rate are as follows: June 30, 2019 Weighted average remaining lease term Operating leases 7.84 years Finance leases 1.64 years Weighted average discount rate Operating leases 5.70 % Finance leases 3.58 % The components of lease expense for the three and six months ended June 30, 2019 were as follows: (in thousands) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease cost: Fixed $ 19,288 $ 34,084 Variable 1,869 3,447 Impairment of ROU Asset 25,857 25,857 Total Operating lease cost 47,014 63,388 Finance lease cost: Amortization of right-of-use assets 3,082 6,052 Interest on lease liabilities 175 361 Total Finance lease cost 3,257 6,413 Sublease income 3,355 5,915 Future minimum lease payments under operating and finance leases with non-cancelable lease terms, as of June 30, 2019 , are as follows: (in thousands) Operating Leases Finance Leases 2019 $ 37,768 $ 6,784 2020 75,066 10,062 2021 71,830 2,436 2022 65,920 131 2023 63,178 — 2024 and thereafter 171,840 — Total lease payments 485,602 19,413 Less imputed interest (97,532 ) (1,847 ) Total lease liability $ 388,070 $ 17,566 Future lease payments under non-cancelable leases and sublease receipts as of December 31, 2018 are as follows: (thousands) Capital Operating Subleases 2019 $ 21,983 $ 32,755 $ (8,979 ) 2020 11,283 30,473 (9,324 ) 2021 1,651 25,564 (8,844 ) 2022 — 22,710 (8,552 ) 2023 — 21,456 (8,695 ) Thereafter — 113,779 (36,312 ) Total minimum lease payments $ 34,917 $ 246,737 $ (80,706 )
Leases	Leases The Company adopted ASU 2016-02 on January 1, 2019, and elected the modified retrospective method of implementation. The standard requires the recognition of ROU assets and lease liabilities for leases, which are defined as a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. The Company has elected the practical expedient which allows for leases with an initial term of 12 months or less to be excluded from recognition on the condensed consolidated statement of financial condition and for which lease expense is recognized on a straight-line basis over the lease term. For the Company, Topic 842 primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. These leases are primarily for corporate office space, datacenters, and technology equipment. The leases have remaining terms of 1 year to 13 years , some of which include options to extend the initial term at the Company's discretion. The lease terms used in calculating ROU assets and lease liabilities include the options to extend the initial term when the Company is reasonably certain of exercising the options. The Company's lease agreements do not contain any material residual value guarantees, restrictions or covenants. In addition to the base rental costs, the Company’s lease agreements for corporate office space generally provide for rent escalations resulting from increased assessments for operating expenses, real estate taxes and other charges. Payments for such reimbursable expenses are considered variable and are recognized as variable lease costs in the period in which the obligation for those payments was incurred. The Company also subleases certain office space and facilities to third parties. The subleases have remaining terms of 1 to 13 years . The Company recognizes sublease income on a straight-line basis over the term of the sublease within Other, net on the condensed consolidated statement of comprehensive income. As the implied discount rate for most of the Company's leases is not readily determinable, the Company uses its incremental borrowing rate on its secured borrowings, which was based on the information available as of the initial transition date, January 1, 2019, in determining the present value of lease payments. During the three months ended June 30, 2019, the Company ceased use of certain office lease premises as part of its ongoing effort to consolidate office space. For the three and six months ended June 30, 2019, the Company recognized $65.2 million in Termination of office leases on the condensed consolidated statement of comprehensive income related to these premises, comprising $25.9 million of impairments of ROU assets, $37.9 million of write-offs of leasehold improvements and fixed assets, and $1.4 million of dilapidation charges. Lease assets and liabilities are summarized as follows: (in thousands) Financial Statement Location June 30, 2019 Operating leases Operating lease right-of-use assets Operating lease right-of-use assets $ 318,269 Operating lease liabilities Operating lease liabilities 388,070 Finance leases Property and equipment, at cost Property, equipment, and capitalized software, net 37,258 Accumulated depreciation Property, equipment, and capitalized software, net (20,139 ) Finance lease liabilities Accounts payable, accrued expenses, and other liabilities 17,566 Weighted average remaining lease term and discount rate are as follows: June 30, 2019 Weighted average remaining lease term Operating leases 7.84 years Finance leases 1.64 years Weighted average discount rate Operating leases 5.70 % Finance leases 3.58 % The components of lease expense for the three and six months ended June 30, 2019 were as follows: (in thousands) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease cost: Fixed $ 19,288 $ 34,084 Variable 1,869 3,447 Impairment of ROU Asset 25,857 25,857 Total Operating lease cost 47,014 63,388 Finance lease cost: Amortization of right-of-use assets 3,082 6,052 Interest on lease liabilities 175 361 Total Finance lease cost 3,257 6,413 Sublease income 3,355 5,915 Future minimum lease payments under operating and finance leases with non-cancelable lease terms, as of June 30, 2019 , are as follows: (in thousands) Operating Leases Finance Leases 2019 $ 37,768 $ 6,784 2020 75,066 10,062 2021 71,830 2,436 2022 65,920 131 2023 63,178 — 2024 and thereafter 171,840 — Total lease payments 485,602 19,413 Less imputed interest (97,532 ) (1,847 ) Total lease liability $ 388,070 $ 17,566 Future lease payments under non-cancelable leases and sublease receipts as of December 31, 2018 are as follows: (thousands) Capital Operating Subleases 2019 $ 21,983 $ 32,755 $ (8,979 ) 2020 11,283 30,473 (9,324 ) 2021 1,651 25,564 (8,844 ) 2022 — 22,710 (8,552 ) 2023 — 21,456 (8,695 ) Thereafter — 113,779 (36,312 ) Total minimum lease payments $ 34,917 $ 246,737 $ (80,706 )

Cash

Cash	6 Months Ended
	Jun. 30, 2019
Cash and Cash Equivalents [Abstract]
Cash	Cash The following table provides a reconciliation of cash and cash equivalents together with restricted cash as reported within the condensed consolidated statements of financial condition to the sum of the same such amounts shown in the condensed consolidated statements of cash flows. (in thousands) June 30, 2019 December 31, 2018 Cash and cash equivalents $ 458,064 $ 729,547 Cash restricted or segregated under regulations and other 39,497 6,500 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 497,561 $ 736,047

Capital Structure

Capital Structure	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Capital Structure	Capital Structure The Company has four classes of authorized common stock. The Class A Common Stock and the Class C Common Stock have one vote per share. The Class B Common Stock and the Class D Common Stock have 10 votes per share. Shares of the Company’s common stock generally vote together as a single class on all matters submitted to a vote of the Company’s stockholders. During the period prior to the Reorganization Transactions and IPO, Class A-2 profits interests and Class B interests in Virtu Financial were issued to Employee Holdco (as defined below) on behalf of certain key employees and stakeholders. In connection with the Reorganization Transactions, all Class A-2 profits interests and Class B interests were reclassified into Virtu Financial Units. As of June 30, 2019 and December 31, 2018 , there were 8,150,771 and 8,760,755 Virtu Financial Units outstanding held by Employee Holdco, respectively, and 609,984 and 2,958,931 of such Virtu Financial Units and corresponding Class C Common Stock were exchanged into Class A Common Stock, forfeited or repurchased during the six months ended June 30, 2019 and 2018 , respectively. Amended and Restated 2015 Management Incentive Plan The Company’s board of directors and stockholders adopted the 2015 Management Incentive Plan, which became effective upon consummation of the IPO, and was subsequently amended and restated following receipt of approval from the Company’s stockholders on June 30, 2017. The Amended and Restated 2015 Management Incentive Plan provides for the grant of stock options, restricted stock units, and other awards based on an aggregate of 16,000,000 shares of Class A Common Stock, subject to additional sublimits, including limits on the total option grant to any one participant in a single year and the total performance award to any one participant in a single year. Amended and Restated Investment Technology Group, Inc. 2007 Omnibus Equity Compensation Plan On the ITG Closing Date, the Company assumed the Amended and Restated ITG 2007 Equity Plan and the Assumed Awards. As of the ITG Closing Date, the aggregate number of shares of Class A Common Stock subject to such Assumed Awards was 2,497,028 and the aggregate number of shares of Class A Common Stock that remained issuable pursuant to the Amended and Restated ITG 2007 Equity Plan was 1,230,406 . Acquisition of KCG On the KCG Closing Date, the Company completed the all-cash Acquisition of KCG. In connection with the Acquisition of KCG, the Company issued 8,012,821 shares of the Company’s Class A Common Stock to Aranda Investments Pte. Ltd. (“Aranda”), an affiliate of Temasek Holdings (Private) Limited (“Temasek”), for an aggregate purchase price of approximately $125.0 million and 40,064,103 shares of the Company’s Class A Common Stock to North Island Holdings I, LP (the “North Island Stockholder”) for an aggregate purchase price of approximately $618.7 million , in each case in accordance with terms of an investment agreement in a private placement exempt from the registration requirements of the Securities Act of 1933, as amended (the “Securities Act”), pursuant to Section 4(a)(2) of the Securities Act. The investment agreements are described in, and the full text thereof is filed as an exhibit to, the Company’s 2018 annual report on Form 10-K filed with the Securities and Exchange Commission on March 1, 2019. Share Repurchase Program In February 2018, the Company's board of directors authorized a new share repurchase program of up to $50.0 million in Class A Common Stock and Virtu Financial Units by March 31, 2019. On July 27, 2018, the Company's board of directors authorized the expansion of the Company's share repurchase program, increasing the total authorized amount by $50.0 million to $100.0 million and extending the duration of the program through September 30, 2019. Since the inception of the program in February 2018, the Company has repurchased approximately 2.6 million shares of Class A Common Stock and Virtu Financial Units for approximately $65.9 million . The Company now has approximately $34.1 million remaining capacity for future purchases of shares of Class A Common Stock and Virtu Financial Units under the program. Pursuant to the program, the Company may repurchase shares from time to time in open market transactions, privately negotiated transactions or by other means. Repurchases may also be made under Rule 10b5-1 plans. The timing and amount of repurchase transactions will be determined by the Company's management based on its evaluation of market conditions, share price, legal requirements and other factors. The program may be suspended, modified or discontinued at any time without prior notice. Secondary Offerings In May 2018, the Company and certain selling stockholders completed a public offering (the “May 2018 Secondary Offering”) of 17,250,000 shares of Class A Common Stock by the Company and certain selling stockholders at a purchase price per share of $27.16 (the offering price to the public of $28.00 per share minus the underwriters’ discount), which included the exercise in full by the underwriters of their option to purchase additional shares in the May 2018 Secondary Offering. The Company sold 10,518,750 shares of Class A Common Stock in the offering, the net proceeds of which were used to purchase an equivalent number of Virtu Financial Units and corresponding shares of Class D Common Stock from TJMT Holdings LLC pursuant to that certain Member Purchase Agreement, entered into on May 15, 2018 by and between the Company and TJMT Holdings LLC. The selling stockholders sold 6,731,250 shares of Class A Common Stock in the May 2018 Secondary Offering, including 2,081,250 shares of Class A Common Stock issued by the Company upon the exercise of vested stock options. In connection with the May 2018 Secondary Offering, the Company, TJMT Holdings LLC, the North Island Stockholder, Havelock Fund Investments Pte. Ltd. (“Havelock”) and Aranda entered into that certain Amendment No. 1 to the Amended and Restated Registration Rights Agreement dated April 20, 2017, by and among the Company, TJMT Holdings LLC, the North Island Stockholder, Havelock, Aranda and certain direct or indirect equityholders of the Company (the “Amended and Restated Registration Rights Agreement”) to add Mr. Vincent Viola and Mr. Michael Viola, directors of the Company, and to confirm that certain other persons (including the Company’s CEO) remain parties to the Amended and Restated Registration Rights Agreement. In May 2019, the Company completed a public offering (the “May 2019 Secondary Offering”) of 9,000,000 shares of Class A Common Stock at a purchase price per share paid by the underwriters of $22.00 , the proceeds of which were used to purchase an equivalent number of Virtu Financial Units and corresponding shares of Class D Common Stock from TJMT Holdings LLC pursuant to that certain Member Purchase Agreement, entered into on May 14, 2019 by and between the Company and TJMT Holdings LLC. Employee Exchanges During the six months ended June 30, 2019 and 2018 , pursuant to the exchange agreement by and among the Company, Virtu Financial and holders of Virtu Financial Units, certain current and former employees elected to exchange 609,984 and 3,508,217 units, respectively in Virtu Financial held directly or on their behalf by Virtu Employee Holdco LLC (“Employee Holdco”) on a one -for-one basis for shares of Class A Common Stock. As a result of the completion of the IPO, the Reorganization Transactions, the Secondary Offerings, employee exchanges, and the share issuance in connection with the Acquisition of KCG, the Company holds approximately a 62.0% interest in Virtu Financial at June 30, 2019 .

Share-based Compensation

Share-based Compensation	6 Months Ended
	Jun. 30, 2019
Share-based Payment Arrangement [Abstract]
Share-based Compensation	Share-based Compensation Pursuant to the Amended and Restated 2015 Management Incentive Plan as described in Note 18 “Capital Structure” , and in connection with the IPO, non-qualified stock options to purchase shares of Class A Common Stock were granted, each of which vests in equal annual installments over a period of four years from grant date and expires not later than 10 years from the date of grant. The following table summarizes activity related to stock options for the six months ended June 30, 2019 and 2018 : Options Outstanding Options Exercisable Number of Options Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Life Number of Options Weighted Average Exercise Price Per Share At December 31, 2017 7,783,000 $ 19.00 7.29 3,891,500 $ 19.00 Granted — — — — — Exercised (4,049,058 ) 19.00 — (4,049,058 ) 19.00 Forfeited or expired (83,750 ) — — — — At June 30, 2018 3,650,192 19.00 6.80 1,779,442 19.00 At December 31, 2018 3,486,150 19.00 6.30 1,660,400 19.00 Granted 156,129 13.60 4.87 156,129 13.60 Exercised (353,500 ) 19.00 — (353,500 ) 19.00 Forfeited or expired (40,000 ) — — — — At June 30, 2019 3,248,779 $ 18.74 5.74 3,248,779 $ 18.74 The expected life has been determined based on an average of vesting and contractual period. The risk-free interest rate was determined based on the yields available on U.S. Treasury zero-coupon issues. The expected stock price volatility was determined based on historical volatilities of comparable companies. The expected dividend yield was determined based on estimated future dividend payments divided by the IPO stock price. The Company recognized $1.5 million for the three months ended June 30, 2018 , and $1.4 million and $2.9 million for the six months ended June 30, 2019 and 2018 , respectively, of compensation expense in relation to the stock options issued and outstanding. As of June 30, 2019 the stock options to purchase shares of Class A Common Stock were fully vested. As of December 31, 2018 , total unrecognized share-based compensation expense related to unvested stock options was $1.6 million , and the amount was to be recognized over a weighted average period of 0.3 years . Amended and Restated Investment Technology Group, Inc. 2007 Omnibus Equity Compensation Plan On the ITG Closing Date, the Company assumed the Amended and Restated ITG 2007 Equity Plan and the Assumed Awards. The Assumed Awards are subject to the same terms and conditions that were applicable to them under the Amended and Restated ITG 2007 Equity Plan, except that (i) the Assumed Awards relate to shares of the Company’s Class A Common Stock, (ii) the number of shares of Class A Common Stock subject to the Assumed Awards was the result of an adjustment based upon an Exchange Ratio (as defined in the ITG Merger Agreement) and (iii) the performance share unit awards were converted into service-based vesting restricted stock unit awards that were no longer subject to any performance based vesting conditions. As of the ITG Closing Date, the aggregate number of shares of Class A Common Stock subject to such Assumed Awards was 2,497,028 and the aggregate number of shares of Class A Common Stock that remained issuable pursuant to the Amended and Restated ITG 2007 Equity Plan was 1,230,406 . The Company filed a Registration Statement on Form S-8 on the ITG Closing Date to register such shares of Class A Common Stock. Class A Common Stock and Restricted Stock Units Pursuant to the Amended and Restated 2015 Management Incentive Plan as described in Note 18 “Capital Structure” , subsequent to the IPO, shares of immediately vested Class A Common Stock and restricted stock units were granted, with the latter vesting over a period of up to 4 years . The fair value of the Class A Common Stock and RSUs was determined based on a volume weighted average price and is being recognized on a straight-line basis over the vesting period. For the six months ended June 30, 2019 and 2018 , respectively, there were 423,393 and 594,536 shares of immediately vested Class A Common Stock granted as part of year-end compensation. In addition, the Company recorded compensation expense adjustment of $(0.2) million for the three months ended June 30, 2019, and accrued compensation expense of $0.8 million for the three months ended 2018 . The Company accrued $2.5 million and $4.7 million for the six months ended June 30, 2019 and 2018 , respectively, related to immediately vested Class A Common Stock expected to be awarded as part of year-end incentive compensation, which was included in Employee compensation and payroll taxes on the condensed consolidated statements of comprehensive income and Accounts payable, accrued expenses and other liabilities on the condensed consolidated statements of financial condition. The following table summarizes activity related to the RSUs (including the Assumed Awards): Number of Shares Weighted Average Fair Value At December 31, 2017 853,047 $ 17.94 Granted 1,070,917 20.93 Forfeited (127,493 ) 18.30 Vested — — At June 30, 2018 1,796,471 19.70 At December 31, 2018 1,378,922 20.03 Granted 3,305,045 25.76 Forfeited (189,149 ) 20.97 Vested (820,287 ) 23.81 At June 30, 2019 3,674,531 24.29 The Company recognized $16.4 million and $4.5 million for the three months ended June 30, 2019 and 2018 , respectively, and $39.6 million and $8.4 million for the six months ended June 30, 2019 and 2018 , respectively, of compensation expense in relation to the restricted stock units. As of June 30, 2019 and December 31, 2018 , total unrecognized share-based compensation expense related to unvested RSUs was $67.9 million and $21.3 million , respectively, and this amount is to be recognized over a weighted average period of 2 and 1.7 years , respectively.

Regulatory Requirement

Regulatory Requirement	6 Months Ended
	Jun. 30, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Regulatory Requirement	Regulatory Requirement As of June 30, 2019 and December 31, 2018 , U.S. broker-dealer subsidiaries of the Company are subject to the SEC Uniform Net Capital Rule 15c3-1, which requires the maintenance of minimum net capital for each of the five U.S. broker-dealers as detailed in the table below. Pursuant to NYSE rules, VAL was also required to maintain $1.15 million of capital in connection with the operation of its designated market maker (“DMM”) business as of June 30, 2019 . The required amount is determined under the exchange rules as the greater of (i) $1 million or (ii) $75,000 for every 0.1% of NYSE transaction dollar volume in each of the securities for which the Company is registered as the DMM. The regulatory capital and regulatory capital requirements of the U.S broker-dealer subsidiaries as of June 30, 2019 were as follows: (in thousands) Regulatory Capital Regulatory Capital Requirement Excess Regulatory Capital Virtu Americas LLC $ 328,965 $ 4,406 $ 324,559 Virtu Financial BD LLC 101,477 1,000 100,477 Virtu Financial Capital Markets LLC 9,633 1,000 8,633 Virtu ITG LLC 45,020 1,000 44,020 Virtu Alternet Securities LLC 2,189 100 2,089 The regulatory capital and regulatory capital requirements of the U.S. broker-dealer subsidiaries as of December 31, 2018 were as follows: (in thousands) Regulatory Capital Regulatory Capital Requirement Excess Regulatory Capital Virtu Americas LLC $ 381,211 $ 2,035 $ 379,176 Virtu Financial BD LLC 133,850 1,000 132,850 Virtu Financial Capital Markets LLC 9,457 1,000 8,457 As of June 30, 2019 , VAL and VITG had $23.0 million and $7.4 million , respectively, of cash in special reserve bank accounts for the benefit of customers pursuant to SEC Rule 15c3-3, Computation for Determination of Reserve Requirements, and $1.0 million and $4.4 million , respectively, of cash in reserve bank accounts for the benefit of proprietary accounts of brokers. The Company’s foreign subsidiaries are subject to regulatory capital requirements set by local regulatory bodies, including the Investment Industry Regulatory Organization of Canada (“IIROC”), the Central Bank of Ireland, the Financial Conduct Authority in the United Kingdom, the Australian Securities Exchange, the Securities and Futures Commission in Hong Kong, and the Monetary Authority of Singapore. Virtu Financial Canada ULC was admitted to membership in IIROC in March 2019. The regulatory net capital balances and regulatory capital requirements applicable to these subsidiaries as of June 30, 2019 were as follows: (in thousands) Regulatory Capital Regulatory Capital Requirement Excess Regulatory Capital Canada Virtu ITG Canada Corp $ 17,854 $ 191 $ 17,663 TriAct Canada Marketplace LP 1,518 191 1,327 Virtu Financial Canada ULC 2,591 191 2,400 Ireland Virtu ITG Europe Limited 52,855 31,324 21,531 Virtu Financial Ireland Limited 79,308 35,537 43,771 United Kingdom Virtu ITG UK Limited 1,335 952 383 KCG Europe Limited 50,672 32,000 18,672 Asia Pacific Virtu ITG Australia Limited 26,682 14,545 12,137 Virtu ITG Hong Kong Limited 2,071 538 1,533 Virtu ITG Singapore Pte Limited 1,034 74 960

Geographic Information and Busi

Geographic Information and Business Segments	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Geographic Information and Business Segments	Geographic Information and Business Segments The Company operates its business in the U.S. and internationally, primarily in Europe and Asia. Significant transactions and balances between geographic regions occur primarily as a result of certain of the Company’s subsidiaries incurring operating expenses such as employee compensation, communications and data processing and other overhead costs, for the purpose of providing execution, clearing and other support services to affiliates. Charges for transactions between regions are designed to approximate full costs. Intra-region income and expenses and related balances have been eliminated in the geographic information presented below to accurately reflect the external business conducted in each geographical region. The revenues are attributed to countries based on the locations of the subsidiaries. The following table presents total revenues by geographic area for the three and six months ended June 30, 2019 and 2018 : Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Revenues: United States (1) $ 274,074 $ 277,263 $ 565,410 $ 1,020,414 Ireland 48,890 24,601 84,565 38,624 United Kingdom (817 ) 3,245 (533 ) 14,845 Singapore 29,707 22,626 56,545 68,837 Canada 15,088 — 20,300 — Australia 10,591 — 13,893 — Others 923 391 1,268 459 Total revenues $ 378,456 $ 328,126 $ 741,448 $ 1,143,179 (1) Includes $337.6 million gain on sale of BondPoint for the six months ended June 30, 2018 . The Company has two operating segments: (i) Market Making and (ii) Execution Services; and one non-operating segment: Corporate. The Market Making segment principally consists of market making in the cash, futures and options markets across global equities, options, fixed income, currencies and commodities. As a market maker, the Company commits capital on a principal basis by offering to buy securities from, or sell securities to, broker-dealers, banks and institutions. The Company engages in principal trading in the Market Making segment direct to clients as well as in a supplemental capacity on exchanges, ECNs and ATSs. The Company is an active participant on all major global equity and futures exchanges and also trades on substantially all domestic electronic options exchanges. As a complement to electronic market making, the cash trading business handles specialized orders and also transacts on the OTC Link ATS operated by OTC Markets Group Inc. and the AIM. The Execution Services segment comprises agency-based trading and trading venues, offering execution services in global equities, options, futures and fixed income on behalf of institutions, banks and broker-dealers as well as technology services revenues. The Company earns commissions and commission equivalents as an agent on behalf of clients as well as between principals to transactions; in addition, the Company will commit capital on behalf of clients as needed. Agency-based, execution-only trading in the segment is done primarily through a variety of access points including: (i) algorithmic trading and order routing in global equities and options; (ii) institutional sales traders who offer portfolio trading and single stock sales trading which provides execution expertise for program, block and riskless principal trades in global equities and ETFs; and (iii) matching of client orders in POSIT Alert and in the Company's ATSs, including Virtu MatchIt, POSIT, and MATCHNow. The Execution Services segment also includes revenues derived from providing (a) proprietary risk management and trading infrastructure technology to select third parties for a service fee, (b) workflow technology, the Company’s integrated, broker-neutral trading tools delivered across the globe including trade order and execution management and order management software applications and network connectivity and (c) trading analytics, including (1) tools enabling portfolio managers and traders to improve pre-trade, real-time and post-trade execution performance, (2) portfolio construction and optimization decisions and (3) securities valuation. The Corporate segment contains the Company's investments, principally in strategic trading-related opportunities and maintains corporate overhead expenses and all other income and expenses that are not attributable to the Company's other segments. Management evaluates the performance of its segments on a pre-tax basis. Segment assets and liabilities are not used for evaluating segment performance or in deciding how to allocate resources to segments. The Company’s total revenues and income before income taxes and noncontrolling interest (“Pre-tax earnings”) by segment for the three months ended June 30, 2019 and 2018 are summarized in the following table: (in thousands) Market Making Execution Services Corporate (1) Consolidated Total 2019: Total revenue $ 235,004 $ 142,024 $ 1,428 $ 378,456 Income before income taxes and noncontrolling interest 21,962 (21,697 ) (66,844 ) (66,579 ) 2018: Total revenue 287,695 40,774 (343 ) 328,126 Income (loss) before income taxes and noncontrolling interest 60,003 389 (10,770 ) 49,622 (1) Amounts shown in the Corporate segment include eliminations of income statement and balance sheet items included in the Company's other segments. The Company’s Pre-tax earnings by segment for the six months ended June 30, 2019 and 2018 are summarized in the following table: (in thousands) Market Making Execution Services Corporate (1) Consolidated Total 2019 Total revenue $ 514,225 $ 225,542 $ 1,681 $ 741,448 Income before income taxes and noncontrolling interest 69,501 (66,102 ) (86,182 ) (82,783 ) 2018 Total revenue 720,231 424,553 (1,605 ) 1,143,179 Income (loss) before income taxes and noncontrolling interest 223,166 331,574 (36,580 ) 518,160 (1) Amounts shown in the Corporate segment include eliminations of income statement and balance sheet items included in the Company's other segments.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company incurs expenses and maintains balances with its affiliates in the ordinary course of business. As of June 30, 2019 , and December 31, 2018 the Company had payables of $1.2 million and $3.0 million to its affiliates, respectively. The Company has held a minority interest in SBI since 2016 (see Note 11 “Financial Assets and Liabilities” ). The Company pays exchange fees to SBI for the trading activities conducted on its proprietary trading system. The Company paid $2.7 million and $2.3 million for the three months ended June 30, 2019 and 2018 , respectively, and $6.1 million and $4.6 million for the six months ended June 30, 2019 and 2018 , respectively, to SBI for these trading activities. The Company makes payments to two JVs (see Note 2 “Summary of Significant Accounting Policies” ) to fund the construction of the microwave communication networks, and to purchase microwave communication networks, which are recorded within communications and data processing on the condensed consolidated statements of comprehensive income. The Company made payments of $5.2 million and $4.4 million to the JVs for the three months ended June 30, 2019 and 2018 , respectively, and $10.4 million and $10.1 million for the six months ended June 30, 2019 and 2018 , respectively. The Company purchases network connections services from affiliates of Level 3 Communications (“Level 3”). Temasek and its affiliates have a significant ownership interest in Level 3. The Company paid $0.5 million and $0.8 million for the three months ended June 30, 2019 and 2018 , respectively, and $0.8 million and $1.5 million for the six months ended June 30, 2019 and 2018 , respectively, to Level 3 for these services.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated subsequent events for adjustment to or disclosure in its condensed consolidated financial statements through the date of this report, and has not identified any recordable or disclosable events, not otherwise reported in these condensed consolidated financial statements or the notes thereto, except for the following: On August 8, 2019, the Company’s board of directors declared a dividend of $0.24 per share of Class A Common Stock and Class B Common Stock and per Restricted Stock Unit that will be paid on September 16, 2019 to holders of record as of September 3, 2019.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The Company's condensed consolidated financial statements are prepared in conformity with U.S. GAAP, which require management to make estimates and assumptions regarding measurements including the fair value of trading assets and liabilities, goodwill and intangibles, compensation accruals, capitalized software, income tax, leases, and other matters that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Accordingly, actual results could differ materially from those estimates.
Earnings Per Share	Earnings Per Share Earnings per share (“EPS”) is calculated on both a basic and diluted basis. Basic EPS excludes dilution and is calculated by dividing income available to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS is calculated by dividing the net income available for common stockholders by the diluted weighted average shares outstanding for that period. Diluted EPS includes the determinants of the basic EPS and, in addition, reflects the dilutive effect of shares of common stock estimated to be distributed in the future under the Company’s share based compensation plans. The Company grants restricted stock units (“RSUs”), certain of which entitle recipients to receive nonforfeitable dividends during the vesting period on a basis equivalent to the dividends paid to holders of common stock. As a result, the unvested RSUs meet the definition of a participating security requiring the application of the two-class method. Under the two-class method, earnings available to common shareholders, including both distributed and undistributed earnings, are allocated to each class of common stock and participating securities according to dividends declared and participating rights in undistributed earnings, which may cause diluted EPS to be more dilutive than the calculation using the treasury stock method.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include money market accounts, which are payable on demand, and short-term investments with an original maturity of less than 90 days. The Company maintains cash in bank deposit accounts that, at times, may exceed federally insured limits. The Company manages this risk by selecting financial institutions deemed highly creditworthy to minimize the risk. Cash restricted or segregated under regulations and other represents (i) special reserve bank accounts for the exclusive benefit of customers (“Special Reserve Bank Account”) maintained by VAL and VITG in accordance with Rule 15c3-3 of the Securities Exchange Act of 1934, as amended (“Customer Protection Rule”), or proprietary accounts of broker-dealers, (ii) funds on deposit for Canadian and European trade clearing and settlement activity, (iii) segregated balances under a collateral account control agreement for the benefit of certain customers, and (iv) funds relating to the securitization of bank guarantees supporting certain of the Company’s foreign leases.
Securities Borrowed and Securities Loaned	Securities Borrowed and Securities Loaned The Company conducts securities borrowing and lending activities with external counterparties. In connection with these transactions, the Company receives or posts collateral, which comprises cash and/or securities. In accordance with substantially all of its stock borrow agreements, the Company is permitted to sell or repledge the securities received. Securities borrowed or loaned are recorded based on the amount of cash collateral advanced or received. The initial cash collateral advanced or received generally approximates or is greater than 102% of the fair value of the underlying securities borrowed or loaned. The Company monitors the fair value of securities borrowed and loaned, and delivers or obtains additional collateral as appropriate. Receivables and payables with the same counterparty are not offset in the condensed consolidated statements of financial condition. Interest received or paid by the Company for these transactions is recorded gross on an accrual basis under Interest and dividends income or Interest and dividends expense in the condensed consolidated statements of comprehensive income.
Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase	Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase In a repurchase agreement, securities sold under agreements to repurchase are treated as collateralized financing transactions and are recorded at contract value, plus accrued interest, which approximates fair value. It is the Company's policy that its custodian take possession of the underlying collateral securities with a fair value approximately equal to the principal amount of the repurchase transaction, including accrued interest. For reverse repurchase agreements, the Company typically requires delivery of collateral with a fair value approximately equal to the carrying value of the relevant assets in the condensed consolidated statements of financial condition. To ensure that the fair value of the underlying collateral remains sufficient, the collateral is valued daily with additional collateral obtained or excess collateral returned, as permitted under contractual provisions. The Company does not net securities purchased under agreements to resell transactions with securities sold under agreements to repurchase transactions entered into with the same counterparty. The Company has entered into bilateral and tri-party term and overnight repurchase and other collateralized financing agreements which bear interest at negotiated rates. The Company receives cash and makes delivery of financial instruments to a custodian who monitors the market value of these instruments on a daily basis. The market value of the instruments delivered must be equal to or in excess of the principal amount loaned under the repurchase agreements plus the agreed upon margin requirement. The custodian may request additional collateral, if appropriate. Interest received or paid by the Company for these transactions is recorded gross on an accrual basis under Interest and dividends income or Interest and dividends expense in the condensed consolidated statements of comprehensive income.
Receivables from/Payables to Broker-dealers and Clearing Organizations	Receivables from/Payables to Broker-dealers and Clearing Organizations Receivables from and payables to broker-dealers and clearing organizations primarily represent amounts due for unsettled trades, open equity in futures transactions, securities failed to deliver or failed to receive, deposits with clearing organizations or exchanges and balances due from or due to prime brokers in relation to the Company’s trading. Amounts receivable from broker-dealers and clearing organizations may be restricted to the extent that they serve as deposits for securities sold, not yet purchased. The Company presents its balances, including outstanding principal balances on all credit facilities, on a net-by-counterparty basis within receivables from and payables to broker-dealers and clearing organizations when the criteria for offsetting are met. In the normal course of business, a significant portion of the Company’s securities transactions, money balances, and security positions are transacted with several third-party brokers. The Company is subject to credit risk to the extent any broker with whom it conducts business is unable to fulfill contractual obligations on its behalf. The Company monitors the financial condition of such brokers and to minimize the risk of any losses from these counterparties.
Financial Instruments Owned Including Those Pledged as Collateral and Financial Instruments Sold, Not Yet Purchased	Financial Instruments Owned Including Those Pledged as Collateral and Financial Instruments Sold, Not Yet Purchased Financial instruments owned and Financial instruments sold, not yet purchased relate to market making and trading activities, and include listed and other equity securities, listed equity options and fixed income securities. The Company records financial instruments owned, including those pledged as collateral, and financial instruments sold, not yet purchased at fair value. Gains and losses arising from financial instrument transactions are recorded net on a trade-date basis in trading income, net, in the condensed consolidated statements of comprehensive income.
Fair Value Measurements	Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or would be paid to transfer a liability (i.e., the exit price) in an orderly transaction between market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. The recognition of “block discounts” for large holdings of unrestricted financial instruments where quoted prices are readily and regularly available in an active market is prohibited. The Company categorizes its financial instruments into a three level hierarchy which prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy level assigned to each financial instrument is based on the assessment of the transparency and reliability of the inputs used in the valuation of such financial instruments at the measurement date based on the lowest level of input that is significant to the fair value measurement. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (level 1 measurement) and the lowest priority to unobservable inputs (level 3 measurements). Financial instruments measured and reported at fair value are classified and disclosed in one of the following categories based on inputs: Level 1 — Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities; Level 2 — Quoted prices in markets that are not active and financial instruments for which all significant inputs are observable, either directly or indirectly; or Level 3 — Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable. Transfers in or out of levels are recognized based on the beginning fair value of the period in which they occurred.
Fair Value Option	Fair Value Option The fair value option election allows entities to make an irrevocable election of fair value as the initial and subsequent measurement attribute for certain eligible financial assets and liabilities. Unrealized gains and losses on items for which the fair value option has been elected are recorded in other, net in the condensed consolidated statements of comprehensive income. The decision to elect the fair value option is determined on an instrument by instrument basis, which must be applied to an entire instrument and is irrevocable once elected.
Derivative Instruments	Derivative Instruments Derivative instruments are used for trading purposes, including economic hedges of trading instruments, are carried at fair value, and include futures, forward contracts, and options. Gains or losses on these derivative instruments are recognized currently within trading income, net in the condensed consolidated statement of comprehensive income. Fair values for exchange-traded derivatives, principally futures, are based on quoted market prices. Fair values for over-the-counter derivative instruments, principally forward contracts, are based on the values of the underlying financial instruments within the contract. The underlying instruments are currencies, which are actively traded. The Company presents its derivatives balances on a net-by-counterparty basis when the criteria for offsetting are met. Cash flows associated with such derivative activities are included in cash flows from operating activities on the condensed consolidated statements of cash flows.
Client Commission Arrangements	Client Commission Arrangements Institutional customers are permitted to allocate a portion of their gross commissions to pay for research products and other services provided by third parties and the Company’s subsidiaries. The amounts allocated for those purposes are commonly referred to as client commission arrangements. The cost of independent research and directed brokerage arrangements is accounted for on an accrual basis. Commission revenue is recorded when earned on a trade date basis. Payments relating to client commission arrangements are netted against the commission revenues. Research receivable, including prepaid research on behalf of customers and balance transfers due from other broker‑dealers, net of an allowance is included in Receivables from customers and Receivables from broker-dealers and clearing organizations, while accrued research payable is included in Accounts payable, accrued expenses, and other liabilities in the condensed consolidated statements of financial condition.
Property and Equipment	Property and Equipment Property and equipment are carried at cost, less accumulated depreciation, except for the assets acquired in connection with acquisitions using the purchase accounting method, which were recorded at fair value on the respective date of acquisitions. Depreciation is provided using the straight-line method over estimated useful lives of the underlying assets. Routine maintenance, repairs and replacement costs are expensed as incurred and improvements that appreciably extend the useful life of the assets are capitalized. When property and equipment are sold or otherwise disposed of, the cost and related accumulated depreciation are removed from the accounts and any resulting gain or loss is recognized in income. Property and equipment are reviewed for impairment whenever events or changes in circumstances indicate that the related carrying amount may not be recoverable. Furniture, fixtures, and equipment are depreciated over three to seven years. Leasehold improvements are amortized over the lesser of the life of the improvement or the term of the lease.
Capitalized Software	Capitalized Software The Company capitalizes costs of materials, consultants, and payroll and payroll related costs for employees incurred in developing internal-use software. Costs incurred during the preliminary project and post-implementation stages are charged to expense. Management’s judgment is required in determining the point at which various projects enter the stages at which costs may be capitalized, in assessing the ongoing value of the capitalized costs, and in determining the estimated useful lives over which the costs are amortized. Capitalized software development costs and related accumulated amortization are included in Property, equipment and capitalized software in the accompanying condensed consolidated statements of financial condition and are amortized over a period of 1.5 to 3 years, which represents the estimated useful lives of the underlying software.
Leases	Leases The Company determines if an arrangement is a lease at inception. Operating leases are included in Operating lease right-of use assets and Operating lease liabilities on the condensed consolidated statements of financial condition. Operating lease right-of-use (“ROU”) assets are assets that represent the lessee’s right to use, or control the use of, a specified asset for the lease term. Finance leases consist primarily of leases for technology and equipment and are included in Property, equipment, and capitalized software and Accounts payable, accrued expenses and other liabilities on the condensed consolidated statements of financial condition. ROU assets and lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at the commencement date. The Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of future payments. The ROU assets are reduced by lease incentives and initial direct costs incurred. The Company's lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for operating leases and amortization of the finance lease ROU asset is recognized on a straight-line basis over the lease term. Certain of the Company's lease agreements contain fixed lease payments that contain lease and non-lease components; for such leases, the Company accounts for the lease and non-lease components as a single lease component.
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the underlying net tangible and intangible assets of the Company’s acquisitions. Goodwill is not amortized but is assessed for impairment on an annual basis and between annual assessments whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Goodwill is assessed at the reporting unit level, which is defined as an operating segment or one level below the operating segment. The Company assesses goodwill for impairment on an annual basis on July 1 and on an interim basis when certain events occur or certain circumstances exist. In the impairment assessment as of July 1, 2018, the Company assessed qualitative factors as described in ASC 350-20 for each of its reporting units for any indicators that the fair values of the reporting units were less than their carrying values.
Intangible Assets	Intangible Assets The Company amortizes finite-lived intangible assets over their estimated useful lives. Finite-lived intangible assets are tested for impairment when impairment indicators are present, and if impaired, they are written down to fair value.
Exchange Memberships and Stock	Exchange Memberships and Stock Exchange memberships are recorded at cost or, if any other than temporary impairment in value has occurred, at a value that reflects management’s estimate of fair value. Exchange memberships acquired in connection with the Acquisition of KCG and the ITG Acquisition were recorded at their fair value on the date of acquisition. Exchange stock includes shares that entitle the Company to certain trading privileges. The Company’s exchange memberships and stock are included in intangibles in the condensed consolidated statements of financial condition.
Trading Income, net	Trading Income, net Trading income, net is comprised of changes in the fair value of trading assets and liabilities (i.e., unrealized gains and losses) and realized gains and losses on trading assets and liabilities. Trading gains and losses on financial instruments owned and financial instruments sold, not yet purchased are recorded on the trade date and reported on a net basis in the condensed consolidated statements of comprehensive income.
Commissions, net and Technology Services	Commissions, net and Technology Services Commissions, net, which primarily comprise commissions and commission equivalents earned on institutional client orders, are recorded on a trade date basis. Under a commission management program, the Company allows institutional clients to allocate a portion of their gross commissions to pay for research and other services provided by third parties. The Company recognizes the related revenue when the third party research services are rendered and payments are made. As the Company acts as an agent in these transactions, it records such expenses on a net basis within commissions, net and technology services in the condensed consolidated statements of comprehensive income. Technology services revenues consist of technology licensing fees and agency commission fees. Technology licensing fees are earned from third parties for licensing of the Company’s proprietary risk management and trading infrastructure technology and the provision of associated management and hosting services. These fees include both upfront and annual recurring fees, as well as, in certain cases, contingent fees based on client revenues, which represent variable consideration. The services offered under these contracts have the same pattern of transfer; accordingly, they are being measured and recognized as a single performance obligation. The performance obligation is satisfied over time, and accordingly, revenue is recognized as time passes. Variable consideration has not been included in the transaction price as the amount of consideration is contingent on factors outside the Company’s control and thus it is not probable that a significant reversal of cumulative revenue recognized will not occur. Recurring fees, which exclude variable consideration, are billed and collected on a quarterly basis. The Company also provides order management software (“OMS”) and related software products and connectivity services to customers and recognizes license fee revenues and monthly connectivity fees. License fee revenues, generated for the use of the Company’s OMS and other software products, is fixed and recognized at the point in time at which the customer is able to use and benefit from the license. Connectivity revenue is variable in nature, based on the number of live connections, and is recognized over time on a monthly basis using a time-based measure of progress. The Company also provides analytics products and services to customers and recognizes subscription fees, which are fixed for the contract term, based on when the products and services are delivered. Analytics products and services may be bundled with trade execution services, in which case commissions are allocated to the analytics performance obligations using an allocation methodology.
Interest and Dividends Income/Interest and Dividends Expense	Interest and Dividends Income/Interest and Dividends Expense Interest income and interest expense are accrued in accordance with contractual rates. Interest income consists of interest earned on collateralized financing arrangements and on cash held by brokers. Interest expense includes interest expense from collateralized transactions, margin and related lines of credit. Dividends on financial instruments owned including those pledged as collateral and financial instruments sold, not yet purchased are recorded on the ex-dividend date and interest is recognized on an accrual basis.
Brokerage, Exchange and Clearance Fees, Net	Brokerage, Exchange and Clearance Fees, Net Brokerage, exchange and clearance fees, net, comprise the costs of executing and clearing trades and are recorded on a trade date basis. Rebates consist of volume discounts, credits or payments received from exchanges or other market places related to the placement and/or removal of liquidity from the order flow in the marketplace. Rebates are recorded on an accrual basis and included net within brokerage, exchange and clearance fees in the accompanying condensed consolidated statements of comprehensive income.
Payments for Order Flow	Payments for Order Flow Payments for order flow represent payments to broker-dealer clients, in the normal course of business, for directing their order flow in U.S. equities to the Company. Payments for order flow are recorded on a trade-date basis in the condensed consolidated statements of comprehensive income.
Income Taxes	Income Taxes The Company is subject to U.S. federal, state and local income taxes on its taxable income. The Company's subsidiaries are subject to income taxes in the respective jurisdictions (including foreign jurisdictions) in which they operate. The provision for income tax is comprised of current tax and deferred tax. Current tax represents the tax on current year tax returns, using tax rates enacted at the balance sheet date. The deferred tax assets are recognized in full and then reduced by a valuation allowance if it is more likely than not that some or all of the deferred tax assets will not be recognized. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the applicable taxing authority, including resolution of the appeals or litigation processes, based on the technical merits of the position. The tax benefits recognized in the condensed consolidated financial statements from such a position are measured based on the largest benefit for each such position that has a greater than fifty percent likelihood of being realized upon ultimate resolution. Many factors are considered when evaluating and estimating the tax positions and tax benefits. Such estimates involve interpretations of regulations, rulings, case law, etc. and are inherently complex. The Company’s estimates may require periodic adjustments and may not accurately anticipate actual outcomes as resolution of income tax treatments in individual jurisdictions typically would not be known for several years after completion of any fiscal year.
Comprehensive Income and Foreign Currency Translation	Comprehensive Income and Foreign Currency Translation Comprehensive income consists of two components: net income and other comprehensive income (“OCI”). The Company’s OCI is comprised of foreign currency translation adjustments. Assets and liabilities of operations having non-U.S. dollar functional currencies are translated at period-end exchange rates, and revenues and expenses are translated at weighted average exchange rates for the period. Gains and losses resulting from translating foreign currency financial statements, net of related tax effects, are reflected in accumulated other comprehensive income, a separate component of stockholders’ equity. The Company's foreign subsidiaries generally use the U.S. dollar as their functional currency. The Company also has subsidiaries that utilize a functional currency other than the U.S. dollar, primarily comprising its subsidiaries domiciled in Ireland, which utilize the Euro and Pound Sterling as the functional currency. The Company may seek to reduce the impact of fluctuations in foreign exchange rates on its net investment in certain non-U.S. operations through the use of foreign currency forward contracts. For foreign currency forward contracts designated as hedges, the Company assesses its risk management objectives and strategy, including identification of the hedging instrument, the hedged item and the risk exposure and how effectiveness is to be assessed prospectively and retrospectively. The effectiveness of the hedge is assessed based on the overall changes in the fair value of the forward contracts. For qualifying net investment hedges, any gains or losses, to the extent effective, are included in Accumulated other comprehensive income on the condensed consolidated statements of financial condition and Cumulative translation adjustment, net of tax, on the condensed consolidated statements of comprehensive income. The ineffective portion, if any, is recorded in investment income and Other, net on the condensed consolidated statements of operations.
Share-Based Compensation	Share-Based Compensation The fair value of awards issued for compensation prior to the Company's initial public offering in April 2015 (the “IPO”) and certain reorganization transactions consummated in connection with the IPO (the “Reorganization Transactions”) was determined by management, with the assistance of an independent third party valuation firm, using a projected annual forfeiture rate, where applicable, on the date of grant. Share-based awards issued for compensation in connection with or subsequent to the Reorganization Transactions and the IPO pursuant to the Virtu Financial, Inc. 2015 Management Incentive Plan (as amended, the “Amended and Restated 2015 Management Incentive Plan”) and pursuant to the Amended and Restated Investment Technology Group, Inc. 2007 Omnibus Equity Compensation Plan, dated as of June 8, 2017 (the “Amended and Restated ITG 2007 Equity Plan”), were in the form of stock options, Class A common stock, par value $0.00001 per share (the “Class A Common Stock”) and RSUs, as applicable. The fair value of the stock option grants is determined through the application of the Black-Scholes-Merton model. The fair value of the Class A Common Stock and RSUs are determined based on the volume weighted average price for the three days preceding the grant, and with respect to the RSUs, a projected annual forfeiture rate. The fair value of share-based awards granted to employees is expensed based on the vesting conditions and are recognized on a straight-line basis over the vesting period. The Company records as treasury stock shares repurchased from its employees for the purpose of settling tax liabilities incurred upon the issuance of Class A Common Stock, the vesting of RSUs or the exercise of stock options.
Variable Interest Entities	Variable Interest Entities A variable interest entity (“VIE”) is an entity that lacks one or more of the following characteristics: (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders have the power to direct the activities of the entity that most significantly impact its economic performance, the obligation to absorb the losses of the entity and the right to receive the residual returns of the entity. The Company will be considered to have a controlling financial interest and will consolidate a VIE if it has both (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. In October 2016, the Company invested in a joint venture (“JV”) with nine other parties. One of the parties was KCG. Upon the Acquisition of KCG, KCG was required to relinquish its ownership in the JV. As of June 30, 2019 , each of the parties owns approximately 10% of the voting shares and 10% of the equity of this JV. In addition, as a result of the Acquisition of KCG, the Company owns 50% of the voting shares and 50% of the equity of another JV. These two JVs build and maintain microwave communication networks in the U.S., Europe, and Asia. The Company and its JV partners each pay monthly fees for the use of the microwave communication networks in connection with their respective trading activities, and the JVs may sell excess bandwidth that is not utilized by the JV members to third parties. The Company also has an interest in a JV that offers derivatives trading technology and execution services to broker-dealers, professional traders and select hedge funds. As of June 30, 2019 , the Company held approximately a 10% indirect minority stake in this JV. The Company's three JVs meet the criteria to be considered VIEs. In each of the JVs, the Company does not have the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance; therefore it does not have a controlling financial interest in and does not consolidate the JVs. The Company records its interest in each JV under the equity method of accounting and records its investment in the JVs within Other assets and its amounts payable for communication services provided by the JV within Accounts Payable, accrued expenses and other liabilities on the condensed consolidated statements of financial condition. The Company records its pro-rata share of each JV's earnings or losses within Other, net and fees related to the use of communication services provided by the JVs within Communications and data processing on the condensed consolidated statements of comprehensive income. The Company’s exposure to the obligations of these VIEs is generally limited to its interests in each respective JV, which is the carrying value of the equity investment in each JV.
Accounting Pronouncements, Recently Adopted and Accounting Pronouncements, Not Yet Adopted	Accounting Pronouncements, Recently Adopted Revenue Recognition - In May 2014, the FASB issued Accounting Standard Update (“ASU”) 2014-09, Revenue from Contracts with Customers . ASU 2014-09 is a comprehensive new revenue recognition model that requires a company to recognize revenue to depict the transfer of goods or services to a customer at an amount that reflects the consideration it expects to receive in exchange for those goods or services. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. For a discussion of the impact of the new standard on the Company’s revenues as well as the additional disclosures required by the new standard, see Note 13 “Revenues from Contracts with Customers” . Leases — In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) . Under the new ASU, a lessee is required to recognize assets and liabilities for leases with lease terms of more than 12 months. The liability is equal to the present value of the future lease payments. The ROU asset is based on the liability, subject to adjustment, such as for initial direct costs. For statement of comprehensive income purposes, leases are classified as either operating or finance. Operating leases result in straight-line expense (similar to previous operating lease guidance) while finance leases result in a front-loaded expense pattern (similar to previous capital lease guidance). Classification is based on criteria that are largely similar to those applied in previous lease accounting, but without explicit bright lines. The Company adopted this ASU on January 1, 2019 using the modified retrospective method of implementation. The Company elected to recognize the cumulative effect adjustment to the opening balance of retained earnings in the period of adoption rather than in the earliest period presented. The Company elected not to recognize lease assets and lease liabilities for leases with a determined lease term of twelve months or less that are not expected to be renewed. The Company elected several practical expedients upon transition, including the expedient not to re-assess the lease population as long as contracts were properly scoped as a lease under previous guidance, not to re-assess existing lease classification for existing leases, not to adjust existing costs that were capitalized, and not to separate lease and non-lease components of fixed lease payments. The standard had a material impact on the Company's condensed consolidated statements of financial condition due to the recognition of ROU assets and lease liabilities for operating leases, while the Company's accounting for finance leases remained substantially unchanged. The standard had an immaterial impact on the condensed consolidated statements of comprehensive income. The additional disclosures required by the new standard have been included in Note 16 “Leases” . Stock Compensation - In June 2018, the FASB issued ASU 2018-07, Compensation, Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting , with the objective of conforming the accounting for share-based awards to non-employees to the accounting for awards granted to employees. Previously, non-employee awards were measured at the vesting date, rather than the grant date, which effectively required the awards to be marked to market until the award vested. Under the new ASU, companies are required to measure non-employee awards at the fair value of the instruments issued at the grant date. Entities can also consider the probability of the recipient satisfying any performance conditions. The Company adopted this standard on January 1, 2019. The Company does not currently make share-based awards to non-employees, and the adoption of this ASU did not have a material impact on its condensed consolidated financial statements. Goodwill - In January 2017, the FASB issued ASU 2017-04, Intangibles—Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment . To simplify the subsequent measurement of goodwill, this ASU eliminated Step 2 from the goodwill impairment test. In computing the implied fair value of goodwill under Step 2, an entity had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities (including unrecognized assets and liabilities) following the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination. Instead, under this ASU, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This ASU also eliminated the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. This ASU is effective for public entities in fiscal years beginning after December 15, 2019. The Company early adopted this standard as of January 1, 2019, and the adoption of this ASU did not have a material impact on its condensed consolidated financial statements. Accounting Pronouncements, Not Yet Adopted as of June 30, 2019 Fair Value Measurement - In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement , which modified the disclosure requirements on fair value measurements in ASC Topic 820, Fair Value Measurement. Disclosure requirements were eliminated for the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements. Disclosure requirements were modified for liquidation of investments in certain entities that calculate net asset value, and for measurement uncertainty disclosures. Disclosure requirements were added for changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. The ASU is effective for periods beginning after December 15, 2019, including interim periods within that fiscal year. The Company does not expect the adoption of this ASU to have a material impact on its condensed consolidated financial statements. Consolidation - In October 2018, the FASB issued ASU 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities , which modified how VIEs are assessed for consolidation purposes under ASC Topic 810, Consolidation. Under the update, indirect interests held through related parties in common control arrangements should be considered on a proportional basis for determining whether fees paid to decision makers and service providers are variable interests. The ASU is effective for periods beginning after December 15, 2019, including interim periods within that fiscal year. The Company does not expect the adoption of this ASU to have a material impact on its condensed consolidated financial statements. Measurement of Credit Losses on Financial Instruments - In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326) -Measurement of Credit Losses on Financial Instruments . This ASU amends several aspects of the measurement of credit losses on financial instruments, including replacing the existing incurred credit loss model and other models with the Current Expected Credit Losses model (“CECL”). Under CECL, the allowance for losses for financial assets that are measured at amortized cost reflects management’s estimate of credit losses over the remaining expected life of the financial assets. Expected credit losses for newly recognized financial assets, as well as changes to expected credit losses during the period, would be recognized in earnings, and adoption of the ASU will generally result in earlier recognition of credit losses. Expected credit losses will be measured based on historical experience, current conditions and forecasts that affect the collectability of the reported amount, and credit losses will be generally recognized earlier than under current U.S. GAAP. In June 2019, the FASB issued ASU 2019-05, Financial Instruments-Credit Losses (Topic 326): Targeted Transition Relief , which provides entities with an option to irrevocably elect the fair value option on an instrument-by-instrument basis for certain instruments upon adoption of the new Credit Losses standard. The ASUs are effective for periods beginning after December 15, 2019, including interim periods within that fiscal year. The Company is currently in the process of identifying and developing the changes to the Company’s existing models and processes that will be required under CECL. As of June 30, 2019, the ASU is expected to impact only those financial instruments that are carried by the Company at amortized cost such as collateralized financing arrangements (repurchase agreements and securities borrowing/ lending transactions) and receivables from customers, broker-dealers and clearing organizations, and therefore the Company expects the ASU to have a limited impact on its financial condition, results of operations and cash flows. However, the ultimate impact of adoption of this ASU on the firm’s financial condition, results of operations and cash flows will depend on, among other things, the economic environment and the type of financial assets held by the firm on the date of adoption.
Revenue Recognition	Revenue Recognition The Company adopted ASC Topic 606, Revenue from Contracts with Customers as of January 1, 2018 in the condensed consolidated financial statements by applying the modified retrospective method. The Company’s revenue recognition methods for its contracts with customers prior to the adoption of Topic 606 are consistent with its methods after the adoption of Topic 606. Accordingly, the adoption of the new standard did not result in a transition adjustment to opening retained earnings, and as a result, revenues for contracts with customers would not have been adjusted in prior periods and are not presented herein on an adjusted basis. As a result of the ITG Acquisition, subsequent to the ITG Closing Date, the Company has additional revenue streams as described below. The new revenue guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other U.S. GAAP, and as a result, did not have an impact on the market making elements of the Company’s condensed consolidated statement of comprehensive income most closely associated with financial instruments, including trading income, net and interest and dividend income. The new standard primarily impacts the presentation of the Company's Execution Services revenue streams discussed below, all of which are presented within Commissions, net and technology services on the Company’s condensed consolidated statements of comprehensive income. Commissions, net . The Company earns commission revenue by acting as an agent on behalf of customers. The Company’s performance obligations consist of trade execution and clearing services and are satisfied on the trade date; accordingly, commission revenues are recorded on the trade date. Commission revenues are paid on settlement date; therefore, a receivable is recognized as of the trade date. Under a commission management program, the Company allows institutional clients to allocate a portion of their gross commissions to pay for research and other services provided by third parties. As the Company acts as an agent in these transactions, it records such expenses on a net basis within Commissions, net and technology services in the condensed consolidated statements of comprehensive income. Technology services. The Company’s technology services revenues consist of technology licensing fees and agency commission fees. Technology licensing fees are earned from third parties for licensing of the Company’s proprietary risk management and trading infrastructure technology and the provision of associated management and hosting services. These fees include both upfront and annual recurring fees as well as, in certain cases, contingent fees based on customer revenues, which represent variable consideration. The services offered under these contracts are delivered as an integrated package and are interdependent and have the same pattern of transfer to the customer; accordingly, the Company measures and recognizes them as a single performance obligation. The performance obligation is satisfied over time, and, therefore, revenue is recognized as time passes. Variable consideration has not been included in the transaction price as the amount of consideration is contingent on factors outside the Company’s control and thus it is not probable that a significant reversal of cumulative revenue recognized will not occur. Recurring fees, which exclude variable consideration, are billed and collected on a quarterly basis and are included within Receivables from broker-dealers and clearing organizations. Workflow technology. Through its front-end workflow solutions and network capabilities, the Company provides order and trade execution management and order routing services. The Company provides trade order routing from its execution management system (“EMS”) to its execution services offerings, with each trade order routed through the EMS representing a separate performance obligation that is satisfied at a point in time. Commissions earned are fixed and revenue is recognized on the trade date. A portion of the commissions earned on the trade is then allocated to workflow technology based on the stand-alone selling price paid by third-party brokers for order routing. The remaining commission is allocated to commissions, net using a residual allocation approach. The Company participates in commission share arrangements, where trade orders are routed to third-party brokers from its EMS and its order management system (“OMS”). Commission share revenues from third-party brokers are generally fixed and revenue is recognized at a point in time on the trade date. The Company provides OMS and related software products and connectivity services to customers and recognizes license fee revenues and monthly connectivity fees. License fee revenues, generated for the use of the Company’s OMS and other software products, is fixed and recognized at the point in time at which the customer is able to use and benefit from the license. Connectivity revenue is variable in nature, based on the number of live connections, and is recognized over time on a monthly basis using a time-based measure of progress. Analytics. The Company provides customers with analytics products and services, including trading and portfolio analytics tools. The Company provides analytics products and services to customers and recognizes subscription fees, which are fixed for the contract term, based on when the products and services are delivered. Analytics services can be delivered either over time (when customers are provided with distinct ongoing access to analytics data) or at a point in time (when reports are only delivered to the customer on a periodic basis). Over time performance obligations are recognized using a time-based measure of progress on a monthly basis, since the analytics products and services are continually provided to the client. Point in time performance obligations are recognized when the analytics reports are delivered to the client. Analytics products and services can also be paid for through variable bundled arrangements with trade execution services. Customers agree to pay for analytics products and services with commissions generated from trade execution services, and commissions are allocated to the analytics performance obligation(s) using: (i) the commission value for each customer for the products and services it receives, which is priced using the value for similar stand-alone subscription arrangements; and (ii) a calculated ratio of the commission value for the products and services relative to the total amount of commissions generated from the customer. For these bundled commission arrangements, the allocated commissions to each analytics performance obligation are then recognized as revenue when the analytics product is delivered, either over time or at a point in time. These allocated commissions may be deferred if the allocated amount exceeds the amount recognizable based on delivery.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of nonconsolidated VIE	The following table presents the Company’s nonconsolidated VIEs at June 30, 2019 : Carrying Amount Maximum Exposure to Loss VIEs' assets (in thousands) Asset Liability Equity investment $ 18,520 $ — $ 18,520 $ 52,892 The following table presents the Company’s nonconsolidated VIEs at December 31, 2018 : Carrying Amount Maximum Exposure to Loss VIEs' assets (in thousands) Asset Liability Equity investment $ 18,254 $ — $ 18,254 $ 49,450

ITG Acquisition (Tables)

ITG Acquisition (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Summary of the estimated fair values of the assets acquired and liabilities assumed	The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the ITG Closing Date: (in thousands) March 31, 2019 Measurement Period June 30, 2019 Cash and equivalents $ 197,072 $ — $ 197,072 Cash and securities segregated under federal regulations 14,232 — 14,232 Securities borrowed 13,182 — 13,182 Receivables from broker dealers and clearing organizations 328,112 — 328,112 Financial instruments owned, at fair value 523 — 523 Receivables from customers 122,697 — 122,697 Property, equipment and capitalized software (net) 46,408 — 46,408 Intangibles 479,600 — 479,600 Deferred tax assets 17,221 — 17,221 Operating lease right-of-use assets 87,236 — 87,236 Other assets 31,653 4,400 36,053 Total Assets 1,337,936 4,400 1,342,336 Short-term borrowings 18,651 — 18,651 Securities loaned 17,663 — 17,663 Payables to broker dealers and clearing organizations 152,043 — 152,043 Payables to customers 116,419 — 116,419 Financial instruments sold, not yet purchased, at fair value 11 — 11 Accounts payable and accrued expenses and other liabilities 172,727 7,500 180,227 Operating lease liabilities 104,983 — 104,983 Deferred tax liabilities 65,888 — 65,888 Total Liabilities 648,385 7,500 655,885 Total identified assets acquired, net of assumed liabilities 689,551 (3,100 ) 686,451 Goodwill 357,334 3,100 360,434 Total Purchase Price $ 1,046,885 $ — $ 1,046,885
Schedule of preliminary allocation of intangible assets, amortization period and goodwill	Amounts preliminarily allocated to intangible assets, the amortization period and goodwill were as follows: (in thousands) Amount Amortization Technology $ 93,000 5 Customer relationships 383,000 10 Trade names 3,600 3 Intangible assets 479,600 Goodwill 360,434 Total $ 840,034
Schedule of pro forma results	Included in the Company’s results for the three and six months ended June 30, 2019 are results from the business acquired as a result of the ITG Acquisition, from the ITG Closing Date through June 30, 2019 as follows: (in thousands) Three Months Ended Six Months Ended Revenues $ 106,160 $ 142,061 Income (loss) before income taxes (1,666 ) (50,074 )
Schedule of pro forma financial Information	The pro forma financial information combines the historical results for the Company and ITG for the three and six months ended June 30, 2019 and 2018 : For the Three Months Ended June 30, For the Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Revenue $ 378,456 $ 456,584 $ 816,706 $ 1,403,140 Net income (loss) (53,235 ) 11,851 (70,890 ) 380,844 Net income (loss) available for common stockholders (31,477 ) 12,021 (37,510 ) 166,768

Sale of BondPoint (Tables)

Sale of BondPoint (Tables)	6 Months Ended
	Jun. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]
Summary of assets and liabilities of businesses held for sale	A summary of the carrying value of BondPoint and gain on sale of BondPoint is as follows: (in thousands) Total sale proceeds received $ 400,192 Business assets and liabilities held for sale as of December 31, 2017: Receivables from broker dealers and clearing organizations 3,383 Intangibles and other assets 51,687 Liabilities (728 ) Total carrying value of BondPoint as of December 31, 2017: 54,342 Goodwill adjustment allocated to BondPoint 8,300 Gain on sale of BondPoint 337,550 Transaction costs 8,568 Gain on sale of BondPoint, net of transaction costs $ 328,982

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Schedule of reconciliation of net income before noncontrolling interest to net income available for common stockholders	The below table contains a reconciliation of net income (loss) before noncontrolling interest to net income (loss) available for common stockholders: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Income (loss) before income taxes and noncontrolling interest $ (66,579 ) $ 49,622 $ (82,783 ) $ 518,160 Provision for (benefit from) income taxes (11,094 ) 3,000 (13,679 ) 61,515 Net income (loss) (55,485 ) 46,622 (69,104 ) 456,645 Noncontrolling interest 25,594 (21,413 ) 32,540 (256,684 ) Net income (loss) available for common stockholders $ (29,891 ) $ 25,209 $ (36,564 ) $ 199,961
Schedule of basic earnings per share	The calculation of basic and diluted earnings per share is presented below: Three Months Ended June 30, Six Months Ended June 30, (in thousands, except for share or per share data) 2019 2018 2019 2018 Basic earnings (loss) per share: Net income (loss) available for common stockholders $ (29,891 ) $ 25,209 $ (36,564 ) $ 199,961 Less: Dividends and undistributed earnings allocated to participating securities (466 ) (443 ) (907 ) (3,611 ) Net income (loss) available for common stockholders, net of dividends and undistributed earnings allocated to participating securities (30,357 ) 24,766 (37,471 ) 196,350 Weighted average shares of common stock outstanding: Class A 112,828,240 99,542,659 110,076,375 95,124,675 Basic earnings (loss) per share $ (0.27 ) $ 0.25 $ (0.34 ) $ 2.06
Schedule of diluted earnings per share	Three Months Ended June 30, Six Months Ended June 30, (in thousands, except for share or per share data) 2019 2018 2019 2018 Diluted earnings (loss) per share: Net income (loss) available for common stockholders, net of dividends and undistributed earnings allocated to participating securities $ (30,357 ) $ 24,766 $ (37,471 ) $ 196,350 Weighted average shares of common stock outstanding: Class A Issued and outstanding 112,828,240 99,542,659 110,076,375 95,124,675 Issuable pursuant to Amended and Restated 2015 Management Incentive Plan (1) — 2,076,992 — 2,030,429 112,828,240 101,619,651 110,076,375 97,155,104 Diluted earnings (loss) per share $ (0.27 ) $ 0.24 $ (0.34 ) $ 2.02 (1) The dilutive impact excludes from the computation of earnings (loss) per share for the three and six months ended June 30, 2019, respectively, 669,064 and 746,392 unexercised stock options and 299,288 and 262,785 restricted stock units issuable pursuant to Amended and Restated Investment Technology Group, Inc. 2007 Omnibus Equity Compensation Plan because the inclusion of the options and restricted stock units would have been anti-dilutive.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of goodwill by segment	The following table presents the details of goodwill by segment: (in thousands) Market Making Execution Services Corporate Total Balance as of December 31, 2018 $ 755,292 $ 81,291 $ — $ 836,583 Goodwill recognized in ITG Acquisition — 360,434 — 360,434 Currency translation adjustment — (469 ) $ — (469 ) Balance as of June 30, 2019 $ 755,292 $ 441,256 $ — $ 1,196,548
Schedule of acquired intangible assets	Acquired intangible assets consisted of the following as of June 30, 2019 and December 31, 2018 : As of June 30, 2019 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Useful Lives (Years) Purchased technology $ 110,000 $ 110,000 $ — 1.4 to 2.5 ETF issuer relationships 950 718 232 9 ETF buyer relationships 950 718 232 9 Technology 153,000 45,990 107,010 1 to 6 Customer relationships 432,000 20,715 411,285 10 to 12 Trade name 3,600 400 3,200 3 Favorable occupancy leases 5,895 1,631 4,264 3 to 15 Exchange memberships 5,838 — 5,838 Indefinite $ 712,233 $ 180,172 $ 532,061 As of December 31, 2018 (in thousands) Gross Carrying Amount Accumulated Amortization Net Carrying Amount Useful Lives Purchased technology $ 110,000 $ 110,000 $ — 1.4 to 2.5 ETF issuer relationships 950 665 285 9 ETF buyer relationships 950 665 285 9 Technology 60,000 30,185 29,815 1 to 6 Customer relationships 49,000 5,905 43,095 12 Favorable occupancy leases 5,895 1,224 4,671 3 to 15 Exchange memberships 5,838 — 5,838 Indefinite $ 232,633 $ 148,644 $ 83,989

Receivables from_Payables to _2

Receivables from/Payables to Broker-Dealers and Clearing Organizations (Tables)	6 Months Ended
	Jun. 30, 2019
Due to and from Broker-Dealers and Clearing Organizations [Abstract]
Summary of receivables from and payables to brokers-dealers and clearing organizations	The following is a summary of receivables from and payables to brokers-dealers and clearing organizations at June 30, 2019 and December 31, 2018 : (in thousands) June 30, 2019 December 31, 2018 Assets Due from prime brokers $ 250,936 $ 302,152 Deposits with clearing organizations 224,049 84,509 Net equity with futures commission merchants 254,237 294,884 Unsettled trades with clearing organization 321,210 193,544 Securities failed to deliver 229,086 218,663 Commissions and fees 7,573 7,697 Total receivables from broker-dealers and clearing organizations $ 1,287,091 $ 1,101,449 Liabilities Due to prime brokers $ 339,899 $ 354,300 Net equity with futures commission merchants 44,084 47,998 Unsettled trades with clearing organization 148,949 90,021 Securities failed to receive 133,946 73,547 Commissions and fees 1,667 1,575 Total payables to broker-dealers and clearing organizations $ 668,545 $ 567,441

Collateralized Transactions (Ta

Collateralized Transactions (Tables)	6 Months Ended
	Jun. 30, 2019
Collateralized Agreements [Abstract]
Summary of the fair value of collateralized transactions	The fair value of the collateralized transactions at June 30, 2019 and December 31, 2018 are summarized as follows: (in thousands) June 30, 2019 December 31, 2018 Securities received as collateral: Securities borrowed $ 1,173,186 $ 1,361,635 Securities purchased under agreements to resell 22,974 15,475 $ 1,196,160 $ 1,377,110
Schedule of financial instruments owned and pledged, where counterparty has right to repledge	Financial instruments owned and pledged, where the counterparty has the right to repledge, at June 30, 2019 and December 31, 2018 consisted of the following: (in thousands) June 30, 2019 December 31, 2018 Equities $ 618,707 $ 748,846 Exchange traded notes 51,294 42,269 $ 670,001 $ 791,115

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Instrument [Line Items]
Outstanding borrowings and financing capacity or unused available capacity under the Company’s borrowing arrangements	The following summarizes the Company’s broker-dealer credit facilities' carrying values, net of unamortized debt issuance costs, where applicable: At June 30, 2019 (in thousands) Interest Rate Financing Available Borrowing Outstanding Deferred Debt Issuance Cost Outstanding Borrowings, net Broker-dealer credit facilities: Uncommitted facility 3.38% $ 200,000 $ 20,000 $ (1,477 ) $ 18,523 Committed facility 3.65% 600,000 72,000 (2,793 ) 69,207 $ 800,000 $ 92,000 $ (4,270 ) $ 87,730 At December 31, 2018 (in thousands) Interest Rate Financing Available Borrowing Outstanding Deferred Debt Issuance Cost Outstanding Borrowings, net Broker-dealer credit facilities: Uncommitted facility 3.40% $ 200,000 $ 10,000 $ (832 ) $ 9,168 Committed facility 3.75% 500,000 7,000 (1,040 ) 5,960 $ 700,000 $ 17,000 $ (1,872 ) $ 15,128
Schedule of interest expense on debt	The following summarizes interest expense for the broker-dealer facilities. Interest expense is included within Interest and dividends expense in the accompanying condensed consolidated statements of comprehensive income. Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Broker-dealer credit facilities: Uncommitted facility $ 177 $ 584 $ 361 $ 1,030 Committed facility 181 54 254 152 $ 358 $ 638 $ 615 $ 1,182
Schedule of aggregate future required principal payments based on terms of loan	As of June 30, 2019 , aggregate future required minimum principal payments based on the terms of the long-term borrowings were as follows: (in thousands) June 30, 2019 2019 $ — 2020 47,452 2021 15,000 2022 515,000 2023 and thereafter 1,405,000 Total principal of long-term borrowings $ 1,982,452
Short-Term Credit Facilities
Debt Instrument [Line Items]
Schedule of reconciliation of the senior secured credit facility	At June 30, 2019 Weighted Average Financing Borrowing Short-Term Credit Facilities: Short-term credit facilities (1) 4.93% $ 566,000 $ 156,894 $ 566,000 $ 156,894 At December 31, 2018 Weighted Average Interest Rate Financing Available Borrowing Outstanding Short-Term Credit Facilities: Short-term credit facilities (1) 5.03% $ 566,000 $ 184,608 $ 566,000 $ 184,608 (1) Outstanding borrowings are included with Receivables from/ Payables to broker-dealers and clearing organizations within the condensed consolidated statements of financial condition.
Senior Secured Credit Facility
Debt Instrument [Line Items]
Schedule of reconciliation of the senior secured credit facility	The following summarizes the Company’s long-term borrowings, net of unamortized discount and debt issuance costs, where applicable: At June 30, 2019 (in thousands) Maturity Interest Outstanding Principal Discount Deferred Debt Issuance Cost Outstanding Borrowings, net Long-term borrowings: First Lien Term Loan Facility March 2026 6.04% $ 1,450,000 $ (6,904 ) $ (28,489 ) $ 1,414,607 Senior Secured Second Lien Notes June 2022 6.75% 500,000 — (15,236 ) 484,764 SBI bonds January 2020 5.00% 32,452 — (12 ) 32,440 $ 1,982,452 $ (6,904 ) $ (43,737 ) $ 1,931,811 At December 31, 2018 (in thousands) Maturity Date Interest Rate Outstanding Principal Discount Deferred Debt Issuance Cost Outstanding Borrowings, net Long-term borrowings: Fourth Amended and Restated Credit Facility December 2021 5.55% $ 400,000 $ (332 ) $ (6,704 ) $ 392,964 Senior Secured Second Lien Notes June 2022 6.75% 500,000 — (17,811 ) 482,189 SBI bonds January 2020 5.00% 31,908 — (24 ) 31,884 $ 931,908 $ (332 ) $ (24,539 ) $ 907,037

Financial Assets and Liabilit_2

Financial Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Summary of fair value measurements measured on a recurring basis	Fair value measurements for those items measured on a recurring basis are summarized below as of June 30, 2019 : June 30, 2019 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Counterparty and Cash Collateral Netting Total Fair Value Assets Financial instruments owned, at fair value: Equity securities $ 864,371 $ 1,338,106 $ — $ — $ 2,202,477 U.S. and Non-U.S. government obligations 68,114 14,716 — — 82,830 Corporate Bonds — 104,667 — — 104,667 Exchange traded notes 184 18,328 — — 18,512 Currency forwards — 2,407,155 — (2,384,305 ) 22,850 Options 3,665 — — — 3,665 936,334 3,882,972 — (2,384,305 ) 2,435,001 Financial instruments owned, pledged as collateral: Equity securities 308,315 310,392 — — 618,707 Exchange traded notes 11 51,283 — — 51,294 308,326 361,675 — — 670,001 Other Assets Equity investment — — 46,351 — 46,351 Exchange stock 2,848 — — — 2,848 2,848 — 46,351 — 49,199 Liabilities Financial instruments sold, not yet purchased, at fair value: Equity securities 1,307,307 1,150,367 — — 2,457,674 U.S. and Non-U.S. government obligations 52,658 2,905 — — 55,563 Corporate Bonds — 170,432 — — 170,432 Exchange traded notes 104 17,807 — — 17,911 Currency forwards — 2,402,231 — (2,390,972 ) 11,259 Options 3,579 — — — 3,579 $ 1,363,648 $ 3,743,742 $ — $ (2,390,972 ) $ 2,716,418 Fair value measurements for those items measured on a recurring basis are summarized below as of December 31, 2018 : December 31, 2018 (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Counterparty and Cash Collateral Netting Total Fair Value Assets Financial instruments owned, at fair value: Equity securities $ 587,680 $ 1,022,221 $ — $ — $ 1,609,901 U.S. and Non-U.S. government obligations 91,466 14,547 — — 106,013 Corporate Bonds — 87,500 — — 87,500 Exchange traded notes 3,396 27,966 — — 31,362 Currency forwards — 2,792,373 — (2,790,242 ) 2,131 Options 11,899 — — — 11,899 694,441 3,944,607 — (2,790,242 ) 1,848,806 Financial instruments owned, pledged as collateral: Equity securities 389,810 359,036 — — 748,846 U.S. and Non-U.S. government obligations — — — — — Exchange traded notes 6,968 35,301 — — 42,269 396,778 394,337 — — 791,115 Other Assets Equity investment — — 45,856 — 45,856 Exchange stock 2,417 — — — 2,417 2,417 — 45,856 — 48,273 Liabilities Financial instruments sold, not yet purchased, at fair value: Equity securities 931,992 1,336,338 — — 2,268,330 U.S. and Non-U.S. government obligations 112,058 3,054 — — 115,112 Corporate Bonds — 40,123 — — 40,123 Exchange traded notes 371 39,613 — — 39,984 Currency forwards — 2,720,749 — (2,719,954 ) 795 Options 11,051 — — — 11,051 $ 1,055,472 $ 4,139,877 $ — $ (2,719,954 ) $ 2,475,395 The table below summarizes financial assets and liabilities not carried at fair value on a recurring basis as of June 30, 2019 : June 30, 2019 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Carrying Value Fair Value (Level 1) (Level 2) (Level 3) Assets Cash and cash equivalents $ 458,064 $ 458,064 $ 458,064 $ — $ — Cash restricted or segregated under regulations and other 39,497 39,497 39,497 — — Securities borrowed 1,201,327 1,201,327 — 1,201,327 — Securities purchased under agreements to resell 22,974 22,974 — 22,974 — Receivables from broker-dealers and clearing organizations 1,287,091 1,287,091 39,394 1,247,697 — Total Assets 3,008,953 3,008,953 536,955 2,471,998 — Liabilities Short-term borrowings 146,847 146,847 — 146,847 — Long-term borrowings 1,931,811 2,003,866 — 2,003,866 — Securities loaned 778,351 778,351 — 778,351 — Securities sold under agreements to repurchase 295,803 295,803 — 295,803 — Payables to broker-dealers and clearing organizations 668,545 668,545 15,876 652,669 — Total Liabilities $ 3,821,357 $ 3,893,412 $ 15,876 $ 3,877,536 $ — The table below summarizes financial assets and liabilities not carried at fair value on a recurring basis as of December 31, 2018 : December 31, 2018 Quoted Prices in Active Markets for Identical Assets Significant Other Observable Inputs Significant Unobservable Inputs (in thousands) Carrying Value Fair Value (Level 1) (Level 2) (Level 3) Assets Cash and cash equivalents $ 736,047 $ 736,047 $ 736,047 $ — $ — Securities borrowed 1,399,684 1,399,684 — 1,399,684 — Securities purchased under agreements to resell 15,475 15,475 — 15,475 — Receivables from broker-dealers and clearing organizations 1,101,449 1,101,449 71,288 1,030,161 — Total Assets 3,252,655 3,252,655 807,335 2,445,320 — Liabilities Short-term borrowings 15,128 15,128 — 15,128 — Long-term borrowings 907,037 916,465 — 916,465 — Securities loaned 1,130,039 1,130,039 — 1,130,039 — Securities sold under agreements to repurchase 281,861 281,861 — 281,861 — Payables to broker dealer and clearing organizations 567,441 567,441 1,031 566,410 — Total Liabilities $ 2,901,506 $ 2,910,934 $ 1,031 $ 2,909,903 $ —
Summary of changes in Level 3 financial instruments measured at fair value on a recurring basis	The following presents the changes in Level 3 financial instruments measured at fair value on a recurring basis: Six Months Ended June 30, 2019 (in thousands) Balance at December 31, 2018 Purchases Total Realized and Unrealized Gains / (Losses) Net Transfers into (out of) Level 3 Settlement Balance at June 30, 2019 Change in Net Unrealized Gains / (Losses) on Investments still held at June 30, 2019 Assets Other assets: Equity investment $ 45,856 $ — $ 495 $ — $ — $ 46,351 $ 495 Total 45,856 — 495 — — 46,351 495 Six Months Ended June 30, 2018 (in thousands) Balance at December 31, 2017 Purchases Total Realized and Unrealized Gains / (Losses) Net Transfers into (out of) Level 3 Settlement Balance at June 30, 2018 Change in Net Unrealized Gains / (Losses) on Investments still held at June 30, 2018 Assets Other assets: Equity investment $ 40,588 $ — $ 505 $ — $ — $ 41,093 $ 505 Total 40,588 — 505 — — 41,093 505
Summary of netting of certain financial assets and financial liabilities	The following tables set forth the gross and net presentation of certain financial assets and financial liabilities as of June 30, 2019 and December 31, 2018 : June 30, 2019 Gross Amounts of Recognized Assets Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition (in thousands) Financial Instruments Cash Collateral Received Net Amount Offsetting of Financial Assets: Securities borrowed $ 1,201,327 $ — $ 1,201,327 $ (1,173,186 ) $ (1,691 ) $ 26,450 Securities purchased under agreements to resell 22,974 — 22,974 (22,974 ) — — Trading assets, at fair value: Currency forwards 2,407,155 (2,384,305 ) 22,850 — — 22,850 Options 3,665 — 3,665 (3,665 ) — — Total $ 3,635,121 $ (2,384,305 ) $ 1,250,816 $ (1,199,825 ) $ (1,691 ) $ 49,300 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition (in thousands) Financial Instruments Cash Collateral Pledged Net Amount Offsetting of Financial Liabilities: Securities loaned $ 778,351 $ — $ 778,351 $ (728,309 ) $ (6,644 ) $ 43,398 Securities sold under agreements to repurchase 295,803 — 295,803 (295,803 ) — — Trading liabilities, at fair value: Currency forwards 2,402,231 (2,390,972 ) 11,259 — — 11,259 Options 3,579 — 3,579 (3,579 ) — — Total $ 3,479,964 $ (2,390,972 ) $ 1,088,992 $ (1,027,691 ) $ (6,644 ) $ 54,657 December 31, 2018 Gross Amounts of Recognized Assets Gross Amounts Offset in the Consolidated Statement of Financial Condition Net Amounts of Assets Presented in the Consolidated Statement of Financial Condition Gross Amounts Not Offset in the Consolidated Statement of Financial Condition (in thousands) Financial Instruments Cash Collateral Received Net Amount Offsetting of Financial Assets: Securities borrowed $ 1,399,684 $ — $ 1,399,684 $ (1,361,635 ) $ (8,822 ) $ 29,227 Securities purchased under agreements to resell 15,475 — 15,475 (15,475 ) — — Trading assets, at fair value: Currency forwards 2,792,373 (2,790,242 ) 2,131 — — 2,131 Options 11,899 — 11,899 (11,899 ) — — Total $ 4,219,431 $ (2,790,242 ) $ 1,429,189 $ (1,389,009 ) $ (8,822 ) $ 31,358 Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Consolidated Statement of Financial Condition Net Amounts of Liabilities Presented in the Consolidated Statement of Financial Condition Gross Amounts Not Offset in the Consolidated Statement of Financial Condition (in thousands) Financial Instruments Cash Collateral Pledged Net Amount Offsetting of Financial Liabilities: Securities loaned $ 1,130,039 $ — $ 1,130,039 $ (1,108,461 ) $ (8,822 ) $ 12,756 Securities sold under agreements to repurchase 281,861 — 281,861 (281,861 ) — — Trading liabilities, at fair value: Currency forwards 2,720,749 (2,719,954 ) 795 — (792 ) 3 Options 11,051 — 11,051 (11,051 ) — — Total $ 4,143,700 $ (2,719,954 ) $ 1,423,746 $ (1,401,373 ) $ (9,614 ) $ 12,759
Summary of gross obligations for repurchase agreement and securities borrowed transactions by remaining contractual maturity and class of collateral pledged	The following table presents gross obligations for securities sold under agreements to repurchase and for securities lending transactions by remaining contractual maturity and the class of collateral pledged: June 30, 2019 Remaining Contractual Maturity (in thousands) Overnight and Continuous Less than 30 days 30 - 60 days 61 - 90 Days Total Securities sold under agreements to repurchase: Equity securities $ — $ 65,000 $ 65,000 $ 160,000 $ 290,000 U.S. and Non-U.S. government obligations 5,803 — — — 5,803 Total 5,803 65,000 65,000 160,000 295,803 Securities lending transactions: Equity securities 778,351 — — — 778,351 Total $ 778,351 $ — $ — $ — $ 778,351 December 31, 2018 Remaining Contractual Maturity (in thousands) Overnight and Continuous Less than 30 days 30 - 60 days 61 - 90 Days Total Securities sold under agreements to repurchase: Equity securities $ — $ 45,000 $ 65,000 $ 160,000 $ 270,000 U.S. and Non-U.S. government obligations 11,861 — — — 11,861 Total 11,861 45,000 65,000 160,000 281,861 Securities loaned: Equity securities 1,130,039 — — — 1,130,039 Total $ 1,130,039 $ — $ — $ — $ 1,130,039

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of fair value of derivative instruments on a gross basis	The fair value of the Company’s derivative instruments on a gross basis consisted of the following at June 30, 2019 and December 31, 2018 : (in thousands) June 30, 2019 December 31, 2018 Derivatives Assets Financial Statements Location Fair Value Notional Fair Value Notional Derivative instruments not designated as hedging instruments: Equities futures Receivables from broker-dealers and clearing organizations $ 1,426 $ 2,902,864 $ (15,382 ) $ 2,891,606 Commodity futures Receivables from broker-dealers and clearing organizations 39,317 9,777,946 69,235 11,595,215 Currency futures Receivables from broker-dealers and clearing organizations (36 ) 2,401,655 (9,432 ) 3,756,914 Fixed income futures Receivables from broker-dealers and clearing organizations 3 553 (28 ) 18,694 Options Financial instruments owned 3,665 296,807 11,899 659,101 Currency forwards Financial instruments owned 2,407,155 174,182,937 2,792,373 171,288,432 Derivatives Liabilities Financial Statements Location Fair Value Notional Fair Value Notional Derivative instruments not designated as hedging instruments: Equities futures Payables to broker-dealers and clearing organizations $ (302 ) $ 160,909 $ 468 $ 106,487 Commodity futures Payables to broker-dealers and clearing organizations (11,522 ) 5,129,312 (375 ) 54,782 Currency futures Payables to broker-dealers and clearing organizations (4,790 ) 2,543,167 (30,643 ) 6,239,725 Fixed income futures Payables to broker-dealers and clearing organizations — — 93 8,591 Options Financial instruments sold, not yet purchased 3,579 310,548 11,051 608,756 Currency forwards Financial instruments sold, not yet purchased 2,402,231 174,180,475 2,720,749 171,252,224 Derivative instruments designated as hedging instruments: Currency forwards Financial instruments sold, not yet purchased — — (792 ) 13,501
Schedule of net gain from derivative instruments not designated as hedging instruments	The following table summarizes the net gain from derivative instruments not designated as hedging instruments under ASC 815, which are recorded in trading income, net, and from those designated as hedging instruments under ASC 815, which are recorded in accumulated other comprehensive income in the accompanying condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2019 and 2018 . Three Months Ended June 30, Six Months Ended June 30, (in thousands) Financial Statements Location 2019 2018 2019 2018 Derivative instruments not designated as hedging instruments: Futures Trading income, net $ 83,225 $ 6,909 $ 155,610 $ (429,506 ) Currency forwards Trading income, net (20,869 ) 110,828 (45,042 ) 196,588 Options Trading income, net 4,335 (9,837 ) 4,997 (8,736 ) $ 66,691 $ 107,900 $ 115,565 $ (241,654 ) Derivative instruments designated as hedging instruments: Foreign exchange - forward contract Accumulated other comprehensive income $ — $ 6 $ — $ 156

Revenues from Contracts with _2

Revenues from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue from Contract with Customer [Abstract]
Disaggregation of revenue	The following tables present the Company’s revenue from contracts with customers disaggregated by the services described above, by timing of revenue recognition, reconciled to the Company’s segments, for the three and six months ended June 30, 2019 : Three Months Ended June 30, 2019 (in thousands) Market Making Execution Services Corporate Total Revenues from contracts with customers: Commissions, net $ 4,961 $ 103,727 $ — $ 108,688 Workflow technology — 25,455 — 25,455 Analytics — 10,977 — 10,977 Total revenue from contracts with customers 4,961 140,159 — 145,120 Other sources of revenue 230,043 1,865 1,428 233,336 Total Revenues 235,004 142,024 1,428 378,456 Timing of revenue recognition: Services transferred at a point in time 235,004 121,763 1,428 358,195 Services transferred over time — 20,261 — 20,261 Total Revenues $ 235,004 $ 142,024 $ 1,428 $ 378,456 Six Months Ended June 30, 2019 (in thousands) Market Making Execution Services Corporate Total Revenues from contracts with customers: Commissions, net $ 9,961 $ 161,482 $ — $ 171,443 Workflow technology — 34,327 — 34,327 Analytics — 14,497 — 14,497 Total revenue from contracts with customers 9,961 210,306 — 220,267 Other sources of revenue 504,264 15,236 1,681 521,181 Total revenues 514,225 225,542 1,681 741,448 Timing of revenue recognition: Services transferred at a point in time 514,225 198,492 1,681 714,398 Services transferred over time — 27,050 — 27,050 Total revenues $ 514,225 $ 225,542 $ 1,681 $ 741,448

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lease assets and liabilities	Lease assets and liabilities are summarized as follows: (in thousands) Financial Statement Location June 30, 2019 Operating leases Operating lease right-of-use assets Operating lease right-of-use assets $ 318,269 Operating lease liabilities Operating lease liabilities 388,070 Finance leases Property and equipment, at cost Property, equipment, and capitalized software, net 37,258 Accumulated depreciation Property, equipment, and capitalized software, net (20,139 ) Finance lease liabilities Accounts payable, accrued expenses, and other liabilities 17,566
Lease term, discount rate and components of lease expense	Weighted average remaining lease term and discount rate are as follows: June 30, 2019 Weighted average remaining lease term Operating leases 7.84 years Finance leases 1.64 years Weighted average discount rate Operating leases 5.70 % Finance leases 3.58 % The components of lease expense for the three and six months ended June 30, 2019 were as follows: (in thousands) Three Months Ended June 30, 2019 Six Months Ended June 30, 2019 Operating lease cost: Fixed $ 19,288 $ 34,084 Variable 1,869 3,447 Impairment of ROU Asset 25,857 25,857 Total Operating lease cost 47,014 63,388 Finance lease cost: Amortization of right-of-use assets 3,082 6,052 Interest on lease liabilities 175 361 Total Finance lease cost 3,257 6,413 Sublease income 3,355 5,915
Future minimum lease payments under operating leases	Future minimum lease payments under operating and finance leases with non-cancelable lease terms, as of June 30, 2019 , are as follows: (in thousands) Operating Leases Finance Leases 2019 $ 37,768 $ 6,784 2020 75,066 10,062 2021 71,830 2,436 2022 65,920 131 2023 63,178 — 2024 and thereafter 171,840 — Total lease payments 485,602 19,413 Less imputed interest (97,532 ) (1,847 ) Total lease liability $ 388,070 $ 17,566 Future lease payments under non-cancelable leases and sublease receipts as of December 31, 2018 are as follows: (thousands) Capital Operating Subleases 2019 $ 21,983 $ 32,755 $ (8,979 ) 2020 11,283 30,473 (9,324 ) 2021 1,651 25,564 (8,844 ) 2022 — 22,710 (8,552 ) 2023 — 21,456 (8,695 ) Thereafter — 113,779 (36,312 ) Total minimum lease payments $ 34,917 $ 246,737 $ (80,706 )
Future minimum lease payments under finance leases	Future minimum lease payments under operating and finance leases with non-cancelable lease terms, as of June 30, 2019 , are as follows: (in thousands) Operating Leases Finance Leases 2019 $ 37,768 $ 6,784 2020 75,066 10,062 2021 71,830 2,436 2022 65,920 131 2023 63,178 — 2024 and thereafter 171,840 — Total lease payments 485,602 19,413 Less imputed interest (97,532 ) (1,847 ) Total lease liability $ 388,070 $ 17,566 Future lease payments under non-cancelable leases and sublease receipts as of December 31, 2018 are as follows: (thousands) Capital Operating Subleases 2019 $ 21,983 $ 32,755 $ (8,979 ) 2020 11,283 30,473 (9,324 ) 2021 1,651 25,564 (8,844 ) 2022 — 22,710 (8,552 ) 2023 — 21,456 (8,695 ) Thereafter — 113,779 (36,312 ) Total minimum lease payments $ 34,917 $ 246,737 $ (80,706 )

Cash (Tables)

Cash (Tables)	6 Months Ended
	Jun. 30, 2019
Cash and Cash Equivalents [Abstract]
Reconciliation of cash and cash equivalents	The following table provides a reconciliation of cash and cash equivalents together with restricted cash as reported within the condensed consolidated statements of financial condition to the sum of the same such amounts shown in the condensed consolidated statements of cash flows. (in thousands) June 30, 2019 December 31, 2018 Cash and cash equivalents $ 458,064 $ 729,547 Cash restricted or segregated under regulations and other 39,497 6,500 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 497,561 $ 736,047
Restrictions on cash and cash equivalents	The following table provides a reconciliation of cash and cash equivalents together with restricted cash as reported within the condensed consolidated statements of financial condition to the sum of the same such amounts shown in the condensed consolidated statements of cash flows. (in thousands) June 30, 2019 December 31, 2018 Cash and cash equivalents $ 458,064 $ 729,547 Cash restricted or segregated under regulations and other 39,497 6,500 Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 497,561 $ 736,047

Share-based Compensation (Table

Share-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2019
Share-based Payment Arrangement [Abstract]
Schedule of stock options activity	The following table summarizes activity related to stock options for the six months ended June 30, 2019 and 2018 : Options Outstanding Options Exercisable Number of Options Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Life Number of Options Weighted Average Exercise Price Per Share At December 31, 2017 7,783,000 $ 19.00 7.29 3,891,500 $ 19.00 Granted — — — — — Exercised (4,049,058 ) 19.00 — (4,049,058 ) 19.00 Forfeited or expired (83,750 ) — — — — At June 30, 2018 3,650,192 19.00 6.80 1,779,442 19.00 At December 31, 2018 3,486,150 19.00 6.30 1,660,400 19.00 Granted 156,129 13.60 4.87 156,129 13.60 Exercised (353,500 ) 19.00 — (353,500 ) 19.00 Forfeited or expired (40,000 ) — — — — At June 30, 2019 3,248,779 $ 18.74 5.74 3,248,779 $ 18.74
Schedule of activity related to restricted stock units	The following table summarizes activity related to the RSUs (including the Assumed Awards): Number of Shares Weighted Average Fair Value At December 31, 2017 853,047 $ 17.94 Granted 1,070,917 20.93 Forfeited (127,493 ) 18.30 Vested — — At June 30, 2018 1,796,471 19.70 At December 31, 2018 1,378,922 20.03 Granted 3,305,045 25.76 Forfeited (189,149 ) 20.97 Vested (820,287 ) 23.81 At June 30, 2019 3,674,531 24.29

Regulatory Requirement (Tables)

Regulatory Requirement (Tables)	6 Months Ended
	Jun. 30, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]
Schedule of regulatory capital and regulatory capital requirements	The regulatory net capital balances and regulatory capital requirements applicable to these subsidiaries as of June 30, 2019 were as follows: (in thousands) Regulatory Capital Regulatory Capital Requirement Excess Regulatory Capital Canada Virtu ITG Canada Corp $ 17,854 $ 191 $ 17,663 TriAct Canada Marketplace LP 1,518 191 1,327 Virtu Financial Canada ULC 2,591 191 2,400 Ireland Virtu ITG Europe Limited 52,855 31,324 21,531 Virtu Financial Ireland Limited 79,308 35,537 43,771 United Kingdom Virtu ITG UK Limited 1,335 952 383 KCG Europe Limited 50,672 32,000 18,672 Asia Pacific Virtu ITG Australia Limited 26,682 14,545 12,137 Virtu ITG Hong Kong Limited 2,071 538 1,533 Virtu ITG Singapore Pte Limited 1,034 74 960 The regulatory capital and regulatory capital requirements of the U.S broker-dealer subsidiaries as of June 30, 2019 were as follows: (in thousands) Regulatory Capital Regulatory Capital Requirement Excess Regulatory Capital Virtu Americas LLC $ 328,965 $ 4,406 $ 324,559 Virtu Financial BD LLC 101,477 1,000 100,477 Virtu Financial Capital Markets LLC 9,633 1,000 8,633 Virtu ITG LLC 45,020 1,000 44,020 Virtu Alternet Securities LLC 2,189 100 2,089 The regulatory capital and regulatory capital requirements of the U.S. broker-dealer subsidiaries as of December 31, 2018 were as follows: (in thousands) Regulatory Capital Regulatory Capital Requirement Excess Regulatory Capital Virtu Americas LLC $ 381,211 $ 2,035 $ 379,176 Virtu Financial BD LLC 133,850 1,000 132,850 Virtu Financial Capital Markets LLC 9,457 1,000 8,457

Geographic Information and Bu_2

Geographic Information and Business Segments (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
Schedule of total revenues by geographic area	The following table presents total revenues by geographic area for the three and six months ended June 30, 2019 and 2018 : Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Revenues: United States (1) $ 274,074 $ 277,263 $ 565,410 $ 1,020,414 Ireland 48,890 24,601 84,565 38,624 United Kingdom (817 ) 3,245 (533 ) 14,845 Singapore 29,707 22,626 56,545 68,837 Canada 15,088 — 20,300 — Australia 10,591 — 13,893 — Others 923 391 1,268 459 Total revenues $ 378,456 $ 328,126 $ 741,448 $ 1,143,179 (1) Includes $337.6 million gain on sale of BondPoint for the six months ended June 30, 2018 .
Schedule of revenues, income (loss) before income taxes (“Pre-tax earnings”) and total assets by segment	The Company’s total revenues and income before income taxes and noncontrolling interest (“Pre-tax earnings”) by segment for the three months ended June 30, 2019 and 2018 are summarized in the following table: (in thousands) Market Making Execution Services Corporate (1) Consolidated Total 2019: Total revenue $ 235,004 $ 142,024 $ 1,428 $ 378,456 Income before income taxes and noncontrolling interest 21,962 (21,697 ) (66,844 ) (66,579 ) 2018: Total revenue 287,695 40,774 (343 ) 328,126 Income (loss) before income taxes and noncontrolling interest 60,003 389 (10,770 ) 49,622 (1) Amounts shown in the Corporate segment include eliminations of income statement and balance sheet items included in the Company's other segments. The Company’s Pre-tax earnings by segment for the six months ended June 30, 2019 and 2018 are summarized in the following table: (in thousands) Market Making Execution Services Corporate (1) Consolidated Total 2019 Total revenue $ 514,225 $ 225,542 $ 1,681 $ 741,448 Income before income taxes and noncontrolling interest 69,501 (66,102 ) (86,182 ) (82,783 ) 2018 Total revenue 720,231 424,553 (1,605 ) 1,143,179 Income (loss) before income taxes and noncontrolling interest 223,166 331,574 (36,580 ) 518,160 (1) Amounts shown in the Corporate segment include eliminations of income statement and balance sheet items included in the Company's other segments.

Organization and Basis of Pre_2

Organization and Basis of Presentation (Details) $ / shares in Units, $ in Billions	Mar. 01, 2019USD ($)$ / shares	Jun. 30, 2019countrysegment
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Number of countries in which entity operates | country		36
Number of operating segments		2
Number of non-operating segments		1
ITG
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Acquisition value (in dollars per share) | $ / shares	$ 30.30
Total cash consideration | $	$ 1
Virtu Financial
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Ownership interest (as a percent)		62.00%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Securities Borrowed and Securities Loaned (Details)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Minimum initial collateral advanced or received expressed as a percentage of fair value of the underlying securities borrowed or loaned	102.00%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Property and Equipment (Details) - Furniture and equipment	6 Months Ended
	Jun. 30, 2019
Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	7 years

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Capitalized Software (Details) - Capitalized software	6 Months Ended
	Jun. 30, 2019
Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	1 year 6 months
Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Share-Based Compensation (Details) - $ / shares	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Number of days prior to the grant that common stock and restricted stock units fair value is determined based on	3 days
Class A
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.00001	$ 0.00001

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Variable Interest Entities (Details) $ in Thousands	1 Months Ended
	Oct. 31, 2016party	Jun. 30, 2019USD ($)joint_venture	Dec. 31, 2018USD ($)
Variable Interest Entity [Line Items]
Number of joint ventures considered as VIEs | joint_venture		3
Equity investment, Carrying Amount, Asset		$ 18,520	$ 18,254
Equity investment, Carrying Amount, Liability		0	0
Equity investment, Maximum Exposure to Loss		18,520	18,254
Equity investment, VIEs' assets		$ 52,892	$ 49,450
JV building microwave communication networks in US and Asia
Variable Interest Entity [Line Items]
Number of other investors in JV | party	9
Ownership of voting shares of JV held be each investor (as a percent)		10.00%
Ownership of equity of JV held be each investor (as a percent)		10.00%
JV building microwave communication networks in US and Europe
Variable Interest Entity [Line Items]
Ownership of voting shares (as a percent)		50.00%
Ownership interest (as a percent)		50.00%
JV offering derivatives trading technology and execution services
Variable Interest Entity [Line Items]
Ownership interest (as a percent)		10.00%

ITG Acquisition - Background (D

ITG Acquisition - Background (Details)	Mar. 01, 2019USD ($)
Committed facility
Business Acquisition [Line Items]
Maximum borrowing capacity	$ 50,000,000
Letter of credit
Business Acquisition [Line Items]
Maximum borrowing capacity	5,000,000
Swingline subfacility
Business Acquisition [Line Items]
Maximum borrowing capacity	5,000,000
First lien term loan
Business Acquisition [Line Items]
Face amount	1,500,000,000
Proceeds from borrowings	404,500,000
First lien term loan | ITG
Business Acquisition [Line Items]
Proceeds from borrowings	$ 1,095,000,000

ITG Acquisition - Accounting Tr

ITG Acquisition - Accounting Treatment of the ITG Acquisition (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019USD ($)
ITG
Business Acquisition [Line Items]
Employee compensation expense	$ 17.6

ITG Acquisition - Purchase Pric

ITG Acquisition - Purchase Price and Goodwill (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 01, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill		$ 1,196,548		$ 836,583
Execution Services
Business Acquisition [Line Items]
Goodwill		441,256		$ 81,291
ITG
Business Acquisition [Line Items]
Total cash consideration	$ 1,000,000
Acquisition value (in dollars per share)	$ 30.30
Goodwill	$ 360,434	$ 360,434	$ 357,334
ITG | Execution Services
Business Acquisition [Line Items]
Goodwill	$ 360,400

ITG Acquisition - Estimated Fai

ITG Acquisition - Estimated Fair Values (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Mar. 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 1,196,548			$ 836,583
ITG
Business Acquisition [Line Items]
Cash and equivalents	197,072	$ 197,072
Cash and securities segregated under federal regulations	14,232	14,232
Securities borrowed	13,182	13,182
Receivables from broker dealers and clearing organizations	328,112	328,112
Financial instruments owned, at fair value	523	523
Receivables from customers	122,697	122,697
Property, equipment and capitalized software (net)	46,408	46,408
Intangibles	479,600	479,600	$ 479,600
Deferred tax assets	17,221	17,221
Operating lease right-of-use assets	87,236	87,236
Other assets	36,053	31,653
Total Assets	1,342,336	1,337,936
Short-term borrowings	18,651	18,651
Short-term borrowings	17,663	17,663
Payables to broker dealers and clearing organizations	152,043	152,043
Payables to customers	116,419	116,419
Financial instruments sold, not yet purchased, at fair value	11	11
Accounts payable and accrued expenses and other liabilities	180,227	172,727
Operating lease liabilities	104,983	104,983
Deferred tax liabilities	65,888	65,888
Total Liabilities	655,885	648,385
Total identified assets acquired, net of assumed liabilities	686,451	689,551
Goodwill	360,434	357,334	$ 360,434
Total Purchase Price	1,046,885	$ 1,046,885
Measurement Period, Assets	4,400
Measurement Period, Liabilities	7,500
Measurement Period, Total identified assets acquired, net of assumed liabilities	(3,100)
Measurement Period, Goodwill	$ 3,100

ITG Acquisition - Intangible As

ITG Acquisition - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 01, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets		$ 532,061		$ 83,989
Goodwill		1,196,548		836,583
Customer relationships
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets		411,285		$ 43,095
Trade names
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets		3,200
ITG
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	$ 479,600
Goodwill	360,434	$ 360,434	$ 357,334
Total	840,034
ITG | Technology
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	$ 93,000
Amortization Years	5 years
ITG | Customer relationships
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	$ 383,000
Amortization Years	10 years
ITG | Trade names
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	$ 3,600
Amortization Years	3 years

ITG Acquisition - Assumption of

ITG Acquisition - Assumption of Equity Compensation Plan (Details) - shares	Jun. 30, 2019	Mar. 01, 2019
Assumed Plan | Class A
Business Acquisition [Line Items]
Shares available for issuance	1,230,406	2,497,028

ITG Acquisition - Tax Treatment

ITG Acquisition - Tax Treatment of the ITG Acquisition (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Deferred tax assets	$ 252,229		$ 200,359
ITG
Business Acquisition [Line Items]
Deferred tax assets		$ 17,200
Deferred tax liabilities		$ 65,900

ITG Acquisition - Pro Forma Res

ITG Acquisition - Pro Forma Results (Details) - ITG - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Revenues	$ 106,160	$ 142,061
Income (loss) before income taxes	$ (1,666)	$ (50,074)

ITG Acquisition - Pro Forma R_2

ITG Acquisition - Pro Forma Results, Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 01, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Advisory and other professional fees		$ 15.1
ITG
Business Acquisition [Line Items]
Advisory and other professional fees		$ 18.2
Common stock, par value (in dollars per share)	$ 0.01
Right to receive cash (in dollars per share)	$ 30.30

ITG Acquisition - Pro Forma Fin

ITG Acquisition - Pro Forma Financial Information (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Revenue	$ 378,456		$ 328,126		$ 741,448	$ 1,143,179
Net income (loss)	(55,485)	$ (13,619)	46,622	$ 410,022	(69,104)	456,645
Net income (loss) available for common stockholders	(29,891)		25,209		(36,564)	199,961
Pro Forma
Business Acquisition [Line Items]
Revenue	378,456		456,584		816,706	1,403,140
Net income (loss)	(53,235)		11,851		(70,890)	380,844
Net income (loss) available for common stockholders	$ (31,477)		$ 12,021		$ (37,510)	$ 166,768

Sale of BondPoint - Narrative (

Sale of BondPoint - Narrative (Details) - USD ($) $ in Thousands	Jan. 02, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of BondPoint		$ 0	$ 400,192
BondPoint | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of BondPoint	$ 400,192
Transaction costs	8,568
Professional fees	7,100
Compensation expense	1,400
Gain on sale of BondPoint, net of transaction costs	$ 337,550		$ 337,600

Sale of BondPoint - Summary of

Sale of BondPoint - Summary of Carrying Value and Gain on Sale (Details) - USD ($) $ in Thousands	Jan. 02, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total sale proceeds received		$ 0	$ 400,192
Business assets and liabilities held for sale:
Gain on sale of BondPoint, net of transaction costs		$ 0	337,550
BondPoint | Held for Sale
Business assets and liabilities held for sale:
Receivables from broker dealers and clearing organizations				$ 3,383
Intangibles and other assets				51,687
Liabilities				(728)
Total carrying value of BondPoint				$ 54,342
BondPoint | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total sale proceeds received	$ 400,192
Business assets and liabilities held for sale:
Goodwill adjustment allocated to BondPoint	8,300
Gain on sale of BondPoint	337,550		$ 337,600
Transaction costs	8,568
Gain on sale of BondPoint, net of transaction costs	$ 328,982

Earnings per Share - Reconcilia

Earnings per Share - Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of net income before minority interest to net income available for common stockholders
Income (loss) before income taxes and noncontrolling interest	$ (66,579)		$ 49,622		$ (82,783)	$ 518,160
Provision for (benefit from) income taxes	(11,094)		3,000		(13,679)	61,515
Net income (loss)	(55,485)	$ (13,619)	46,622	$ 410,022	(69,104)	456,645
Noncontrolling interest	25,594		(21,413)		32,540	(256,684)
Net income (loss) available for common stockholders	$ (29,891)		$ 25,209		$ (36,564)	$ 199,961

Earnings per Share - Basic (Det

Earnings per Share - Basic (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic earnings (loss) per share:
Net income (loss) available for common stockholders	$ (29,891)	$ 25,209	$ (36,564)	$ 199,961
Less: Dividends and undistributed earnings allocated to participating securities	(466)	(443)	(907)	(3,611)
Net income (loss) available for common stockholders, net of dividends and undistributed earnings allocated to participating securities	$ (30,357)	$ 24,766	$ (37,471)	$ 196,350
Weighted average shares of common stock outstanding:
Outstanding (in shares)	112,828,240	99,542,659	110,076,375	95,124,675
Basic earnings (loss) per share (in dollars per share)	$ (0.27)	$ 0.25	$ (0.34)	$ 2.06
Class A
Weighted average shares of common stock outstanding:
Outstanding (in shares)	112,828,240	99,542,659	110,076,375	95,124,675

Earnings per Share - Diluted (D

Earnings per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Diluted earnings (loss) per share:
Net income (loss) available for common stockholders, net of dividends and undistributed earnings allocated to participating securities	$ (30,357)	$ 24,766	$ (37,471)	$ 196,350
Weighted average shares of common stock outstanding:
Issued and outstanding (in shares)	112,828,240	99,542,659	110,076,375	95,124,675
Weighted average shares of common stock outstanding (in shares)	112,828,240	101,619,651	110,076,375	97,155,104
Diluted earnings (loss) per share (in dollars per share)	$ (0.27)	$ 0.24	$ (0.34)	$ 2.02
Stock options
Weighted average shares of common stock outstanding:
Dilutive impact excluded from computation of earnings per share (in shares)	669,064		746,392
RSUs
Weighted average shares of common stock outstanding:
Dilutive impact excluded from computation of earnings per share (in shares)	299,288		262,785
Class A
Weighted average shares of common stock outstanding:
Issued and outstanding (in shares)	112,828,240	99,542,659	110,076,375	95,124,675
Issuable pursuant to 2015 Management Incentive Plan (in shares)	0	2,076,992	0	2,030,429
Weighted average shares of common stock outstanding (in shares)	112,828,240	101,619,651	110,076,375	97,155,104

Tax Receivable Agreements (Deta

Tax Receivable Agreements (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 15, 2015	May 31, 2019	Sep. 30, 2018	May 31, 2018	Feb. 28, 2017	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2018
Class of Stock [Line Items]
Payment on applicable cash tax savings (as a percent)	85.00%
First payment made			$ 12,400		$ 7,000
Minimum tax receivable agreement obligation over the agreed period	$ 2,600
Maximum tax receivable agreement obligation over the agreed period	$ 19,900
Period over which the obligations are to be settled	15 years
Deferred tax asset from tax receivable agreement		$ 42,300		$ 78,700
Tax receivable agreement obligations		41,700		79,700		$ 256,700			$ 214,403
Issuance of tax receivable agreements in connection with employee exchange		$ 600		$ 1,000		644	$ 3,439
Reduction to additional paid-in capital as a result of differences between estimate and tax returns								$ 86,600
Deferred tax assets						$ 200,400			$ 167,100
Class B
Class of Stock [Line Items]
Common stock, par value (in dollars per share)						$ 0.00001			$ 0.00001
Class C
Class of Stock [Line Items]
Common stock, par value (in dollars per share)						0.00001			0.00001
Class D
Class of Stock [Line Items]
Common stock, par value (in dollars per share)						$ 0.00001			$ 0.00001

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)segment	Jun. 30, 2018USD ($)	Mar. 31, 2019USD ($)	Mar. 01, 2019USD ($)	Dec. 31, 2018USD ($)
Goodwill [Line Items]
Number of operating segments | segment			2
Number of non-operating segments | segment			1
Goodwill	$ 1,196,548,000		$ 1,196,548,000				$ 836,583,000
Goodwill impairment	0	$ 0	0	$ 0
Intangible assets	532,061,000		532,061,000				$ 83,989,000
Amortization expense relating to finite-lived intangible assets	20,606,000	$ 6,838,000	31,528,000	$ 13,675,000
ITG
Goodwill [Line Items]
Goodwill	360,434,000		360,434,000		$ 357,334,000	$ 360,434,000
Intangible assets acquired	$ 479,600,000		$ 479,600,000		$ 479,600,000	$ 479,600,000

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019USD ($)
Changes in goodwill
Balance at the beginning of the period	$ 836,583
Goodwill recognized in ITG Acquisition	360,434
Currency translation adjustment	(469)
Balance at the end of the period	1,196,548
Market Making
Changes in goodwill
Balance at the beginning of the period	755,292
Goodwill recognized in ITG Acquisition	0
Currency translation adjustment	0
Balance at the end of the period	755,292
Execution Services
Changes in goodwill
Balance at the beginning of the period	81,291
Goodwill recognized in ITG Acquisition	360,434
Currency translation adjustment	(469)
Balance at the end of the period	441,256
Corporate
Changes in goodwill
Balance at the beginning of the period	0
Goodwill recognized in ITG Acquisition	0
Currency translation adjustment	0
Balance at the end of the period	$ 0

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Acquired Intangible Assets [Line Items]
Accumulated Amortization	$ 180,172	$ 148,644
Net Carrying Amount	532,061	83,989
Gross Carrying Amount	712,233	232,633
Net Carrying Amount	532,061	83,989
Exchange memberships
Acquired Intangible Assets [Line Items]
Exchange memberships	5,838	5,838
Purchased technology
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	110,000	110,000
Accumulated Amortization	110,000	110,000
Net Carrying Amount	$ 0	$ 0
Purchased technology | Minimum
Acquired Intangible Assets [Line Items]
Useful Lives (Years)	1 year 4 months 24 days	1 year 4 months 24 days
Purchased technology | Maximum
Acquired Intangible Assets [Line Items]
Useful Lives (Years)	2 years 6 months	2 years 6 months
ETF issuer relationships
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	$ 950	$ 950
Accumulated Amortization	718	665
Net Carrying Amount	$ 232	$ 285
Useful Lives (Years)	9 years	9 years
ETF buyer relationships
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	$ 950	$ 950
Accumulated Amortization	718	665
Net Carrying Amount	$ 232	$ 285
Useful Lives (Years)	9 years	9 years
Technology
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	$ 153,000	$ 60,000
Accumulated Amortization	45,990	30,185
Net Carrying Amount	$ 107,010	$ 29,815
Technology | Minimum
Acquired Intangible Assets [Line Items]
Useful Lives (Years)	1 year	1 year
Technology | Maximum
Acquired Intangible Assets [Line Items]
Useful Lives (Years)	6 years	6 years
Customer relationships
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	$ 432,000	$ 49,000
Accumulated Amortization	20,715	5,905
Net Carrying Amount	$ 411,285	$ 43,095
Useful Lives (Years)		12 years
Customer relationships | Minimum
Acquired Intangible Assets [Line Items]
Useful Lives (Years)	10 years
Customer relationships | Maximum
Acquired Intangible Assets [Line Items]
Useful Lives (Years)	12 years
Trade name
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,600
Accumulated Amortization	400
Net Carrying Amount	$ 3,200
Useful Lives (Years)	3 years
Favorable occupancy leases
Acquired Intangible Assets [Line Items]
Gross Carrying Amount	$ 5,895	$ 5,895
Accumulated Amortization	1,631	1,224
Net Carrying Amount	$ 4,264	$ 4,671
Favorable occupancy leases | Minimum
Acquired Intangible Assets [Line Items]
Useful Lives (Years)	3 years	3 years
Favorable occupancy leases | Maximum
Acquired Intangible Assets [Line Items]
Useful Lives (Years)	15 years	15 years

Receivables from_Payables to _3

Receivables from/Payables to Broker-Dealers and Clearing Organizations (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Due from prime brokers	$ 250,936	$ 302,152
Deposits with clearing organizations	224,049	84,509
Net equity with futures commission merchants	254,237	294,884
Unsettled trades with clearing organization	321,210	193,544
Securities failed to deliver	229,086	218,663
Commissions and fees	7,573	7,697
Total receivables from broker-dealers and clearing organizations	1,287,091	1,101,449
Liabilities
Due to prime brokers	339,899	354,300
Net equity with futures commission merchants	44,084	47,998
Unsettled trades with clearing organization	148,949	90,021
Securities failed to receive	133,946	73,547
Commissions and fees	1,667	1,575
Total payables to broker-dealers and clearing organizations	668,545	567,441
Outstanding principal balance	$ 156,900	$ 184,600

Collateralized Transactions (De

Collateralized Transactions (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities received as collateral:
Securities borrowed	$ 1,173,186	$ 1,361,635
Securities purchased under agreements to resell	22,974	15,475
Securities received as collateral	1,196,160	1,377,110
Financial instruments owned and pledged	670,001	791,115
Equities
Securities received as collateral:
Financial instruments owned and pledged	618,707	748,846
Exchange traded notes
Securities received as collateral:
Financial instruments owned and pledged	$ 51,294	$ 42,269

Borrowings - Broker-Dealer Cred

Borrowings - Broker-Dealer Credit Facilities, Narrative (Details)	Nov. 03, 2017USD ($)borrowing_basebroker_dealer	Jun. 30, 2019USD ($)debt_instrumentbroker_dealer	Mar. 01, 2019USD ($)	Dec. 31, 2018USD ($)	Nov. 02, 2017USD ($)
Line of Credit Facility [Line Items]
Number of borrowing bases | borrowing_base	2
Number of broker-dealer subsidiaries | broker_dealer	3	5
Broker-dealer credit facilities
Line of Credit Facility [Line Items]
Number of secured credit facilities | debt_instrument		2
Aggregate borrowing	$ 500,000,000	$ 800,000,000	$ 600,000,000	$ 700,000,000
Commitment fee (as a percent)	0.50%
Broker-dealer credit facilities | Borrowing Base A Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 600,000,000				$ 400,000,000
Broker-dealer credit facilities | Borrowing Base A Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate margin (as a percent)	1.25%
Broker-dealer credit facilities | Borrowing Base B Loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 150,000,000				$ 40,000,000
Broker-dealer credit facilities | Borrowing Base B Loan | LIBOR
Line of Credit Facility [Line Items]
Interest rate margin (as a percent)	2.50%
Broker-dealer credit facility on an uncommitted basis
Line of Credit Facility [Line Items]
Number of secured credit facilities | debt_instrument		1
Maximum borrowing capacity		$ 200,000,000
Aggregate borrowing		$ 200,000,000		$ 200,000,000

Borrowings - Broker-Dealer Cr_2

Borrowings - Broker-Dealer Credit Facilities Carrying Values, Net (Details) - USD ($)	Jun. 30, 2019	Mar. 01, 2019	Dec. 31, 2018	Nov. 03, 2017
Line of Credit Facility [Line Items]
Borrowing Outstanding	$ 1,982,452,000
Outstanding Borrowings, net	$ 1,931,811,000		$ 907,037,000
Uncommitted facility
Line of Credit Facility [Line Items]
Interest Rate	3.38%		3.40%
Financing Available	$ 200,000,000		$ 200,000,000
Borrowing Outstanding	20,000,000		10,000,000
Deferred Debt Issuance Cost	(1,477,000)		(832,000)
Outstanding Borrowings, net	$ 18,523,000		$ 9,168,000
Committed facility
Line of Credit Facility [Line Items]
Interest Rate	3.65%		3.75%
Financing Available	$ 600,000,000		$ 500,000,000
Borrowing Outstanding	72,000,000		7,000,000
Deferred Debt Issuance Cost	(2,793,000)		(1,040,000)
Outstanding Borrowings, net	69,207,000		5,960,000
Broker-dealer credit facilities
Line of Credit Facility [Line Items]
Financing Available	800,000,000	$ 600,000,000	700,000,000	$ 500,000,000
Borrowing Outstanding	92,000,000		17,000,000
Deferred Debt Issuance Cost	(4,270,000)		(1,872,000)
Outstanding Borrowings, net	$ 87,730,000		$ 15,128,000

Borrowings - Interest Expense o

Borrowings - Interest Expense on Broker-Dealer Facilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Line of Credit Facility [Line Items]
Interest expense	$ 34,689	$ 18,780	$ 57,478	$ 37,827
Broker-dealer credit facilities
Line of Credit Facility [Line Items]
Interest expense	358	638	615	1,182
Uncommitted facility
Line of Credit Facility [Line Items]
Interest expense	177	584	361	1,030
Committed facility
Line of Credit Facility [Line Items]
Interest expense	$ 181	$ 54	$ 254	$ 152

Borrowings - Short-Term Credit

Borrowings - Short-Term Credit Facilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Short-term Debt [Line Items]
Weighted Average Interest Rate	2.70%		2.70%
Borrowing Outstanding	$ 1,982,452		$ 1,982,452
Interest expense	$ 34,689	$ 18,780	$ 57,478	$ 37,827
Short-Term Credit Facilities
Short-term Debt [Line Items]
Weighted Average Interest Rate	4.93%		4.93%		5.03%
Financing Available	$ 566,000		$ 566,000		$ 566,000
Borrowing Outstanding	156,894		156,894		$ 184,608
Interest expense	$ 1,800	$ 1,900	$ 3,700	$ 3,400

Borrowings - Short-Term Bank Lo

Borrowings - Short-Term Bank Loans (Details) $ in Millions	Jun. 30, 2019USD ($)
Debt Disclosure [Abstract]
Short-term bank loans	$ 59.5
Weighted average interest rate	2.70%

Borrowings - Long-Term Borrowin

Borrowings - Long-Term Borrowings (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 16, 2017
Line of Credit Facility [Line Items]
Outstanding Principal	$ 1,982,452
Outstanding Borrowings, net	$ 1,931,811	$ 907,037
SBI Bonds
Line of Credit Facility [Line Items]
Interest rate	5.00%	5.00%
Outstanding Principal	$ 32,452	$ 31,908
Discount	0	0
Deferred Debt Issuance Cost	(12)	(24)
Outstanding Borrowings, net	32,440	31,884
Total Long-term borrowings
Line of Credit Facility [Line Items]
Outstanding Principal	1,982,452	931,908
Discount	(6,904)	(332)
Deferred Debt Issuance Cost	(43,737)	(24,539)
Outstanding Borrowings, net	$ 1,931,811	$ 907,037
Senior Secured Second Lien Notes
Line of Credit Facility [Line Items]
Interest rate			6.75%
Senior Secured Credit Facility
Line of Credit Facility [Line Items]
Interest rate	6.04%	5.55%
Outstanding Principal	$ 1,450,000	$ 400,000
Discount	(6,904)	(332)
Deferred Debt Issuance Cost	(28,489)	(6,704)
Outstanding Borrowings, net	$ 1,414,607	$ 392,964
Senior Secured Credit Facility | Senior Secured Second Lien Notes
Line of Credit Facility [Line Items]
Interest rate	6.75%	6.75%
Outstanding Principal	$ 500,000	$ 500,000
Discount	0	0
Deferred Debt Issuance Cost	(15,236)	(17,811)
Outstanding Borrowings, net	$ 484,764	$ 482,189

Borrowings - Credit Agreement (

Borrowings - Credit Agreement (Details) - USD ($)	Mar. 01, 2019	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jun. 30, 2017	Jun. 16, 2017
Debt Instrument [Line Items]
Repayment of debt			$ 450,000,000	$ 384,846,000
Outstanding principal amount		$ 1,982,452,000	$ 1,982,452,000
Term maturity date, period	91 days
Revolving maturity date, period	182 days
Overnight Bank Funding Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)			0.50%
Scenario 1
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.50%
Interest rate	1.00%
Basis spread on variable rate, stepdown (as a percent)	2.25%
Scenario 1 | Overnight Bank Funding Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	0.50%
Scenario 1 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.00%
Scenario 2
Debt Instrument [Line Items]
Interest rate	0.00%
Scenario 2 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	3.50%
Basis spread on variable rate, stepdown (as a percent)	3.25%
Senior Secured Credit Facility Fourth Amendment
Debt Instrument [Line Items]
Outstanding principal amount						$ 1,150,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50,000,000
Outstanding principal amount		72,000,000	$ 72,000,000		$ 7,000,000
Commitment fee (as a percent)	0.50%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee stepdown (as a percent)	0.375%
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee stepdown (as a percent)	0.25%
Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 5,000,000
Swingline Subfacility
Debt Instrument [Line Items]
Maximum borrowing capacity	5,000,000
Senior Secured First Lien Term Loan
Debt Instrument [Line Items]
Repayment requirement, minimum amount	$ 400,000,000
Debt amortization, percentage of original aggregate principal amount	1.00%
Senior Secured Second Lien Notes
Debt Instrument [Line Items]
Aggregate principal amount							$ 500,000,000
Interest rate							6.75%
Term Loan | First Lien Term Loan Facility
Debt Instrument [Line Items]
Aggregate principal amount	$ 1,500,000,000
Repayment of debt		50,000,000
Outstanding principal amount		$ 1,450,000,000	$ 1,450,000,000
VFH
Debt Instrument [Line Items]
Proceeds from borrowings	404,500,000
VFH | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	50,000,000
VFH | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	5,000,000
VFH | Swingline Subfacility
Debt Instrument [Line Items]
Maximum borrowing capacity	5,000,000
Acquisition Borrower
Debt Instrument [Line Items]
Proceeds from borrowings	$ 1,095,000,000

Borrowings - Senior Secured Sec

Borrowings - Senior Secured Second Lien Notes (Details) - Senior Secured Second Lien Notes	Jun. 16, 2017USD ($)
Debt Instrument [Line Items]
Face amount	$ 500,000,000
Interest rate	6.75%

Borrowings - SBI Bonds (Details

Borrowings - SBI Bonds (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019JPY (¥)	Dec. 31, 2018USD ($)	Dec. 31, 2018JPY (¥)	Jul. 25, 2016USD ($)	Jul. 25, 2016JPY (¥)
Debt Instrument [Line Items]
Outstanding principal amount	$ 1,982,452		$ 1,982,452
SBI Bonds
Debt Instrument [Line Items]
Outstanding principal amount	32,452		32,452			$ 31,908
VFH | SBI Bonds
Debt Instrument [Line Items]
Face amount								$ 33,100	¥ 3,500,000,000
Outstanding principal amount	32,500		32,500		¥ 3,500,000,000	$ 31,900	¥ 3,500,000,000
Gain (loss) due to change in currency rates	$ 900	$ 1,400	$ 500	$ (500)

Borrowings - Future Minimum Pri

Borrowings - Future Minimum Principal Payments (Details) $ in Thousands	Jun. 30, 2019USD ($)
Debt Disclosure [Abstract]
2019	$ 0
2020	47,452
2021	15,000
2022	515,000
2023 and thereafter	1,405,000
Total principal of long-term borrowings	$ 1,982,452

Financial Assets and Liabilit_3

Financial Assets and Liabilities - Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Assets
Financial instruments owned, at fair value	$ 2,435,001	$ 1,848,806
Financial instruments owned, at fair value, counterparty and cash collateral netting	(2,384,305)	(2,790,242)
Financial instruments owned and pledged	670,001	791,115
Other assets	49,199	48,273
Liabilities
Financial instruments sold, not yet purchased	2,716,418	2,475,395
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting	(2,390,972)	(2,719,954)
Currency forwards
Assets
Financial instruments owned, at fair value	22,850	2,131
Financial instruments owned, at fair value, counterparty and cash collateral netting	(2,384,305)	(2,790,242)
Liabilities
Financial instruments sold, not yet purchased	11,259	795
Financial instruments sold, not yet purchased, at fair value, counterparty and cash collateral netting	(2,390,972)	(2,719,954)
Options
Assets
Financial instruments owned, at fair value	3,665	11,899
Liabilities
Financial instruments sold, not yet purchased	3,579	11,051
Equity securities
Assets
Financial instruments owned, at fair value	2,202,477	1,609,901
Financial instruments owned and pledged	618,707	748,846
Liabilities
Financial instruments sold, not yet purchased	2,457,674	2,268,330
U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	82,830	106,013
Financial instruments owned and pledged		0
Liabilities
Financial instruments sold, not yet purchased	55,563	115,112
Corporate Bonds
Assets
Financial instruments owned, at fair value	104,667	87,500
Liabilities
Financial instruments sold, not yet purchased	170,432	40,123
Exchange traded notes
Assets
Financial instruments owned, at fair value	18,512	31,362
Financial instruments owned and pledged	51,294	42,269
Liabilities
Financial instruments sold, not yet purchased	17,911	39,984
Equity investment
Assets
Other assets	46,351	45,856
Exchange stock
Assets
Other assets	2,848	2,417
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Financial instruments owned, at fair value	936,334	694,441
Financial instruments owned and pledged	308,326	396,778
Other assets	2,848	2,417
Liabilities
Financial instruments sold, not yet purchased	1,363,648	1,055,472
Quoted Prices in Active Markets for Identical Assets (Level 1) | Currency forwards
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Options
Assets
Financial instruments owned, at fair value	3,665	11,899
Liabilities
Financial instruments sold, not yet purchased	3,579	11,051
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Assets
Financial instruments owned, at fair value	864,371	587,680
Financial instruments owned and pledged	308,315	389,810
Liabilities
Financial instruments sold, not yet purchased	1,307,307	931,992
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	68,114	91,466
Financial instruments owned and pledged		0
Liabilities
Financial instruments sold, not yet purchased	52,658	112,058
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate Bonds
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange traded notes
Assets
Financial instruments owned, at fair value	184	3,396
Financial instruments owned and pledged	11	6,968
Liabilities
Financial instruments sold, not yet purchased	104	371
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity investment
Assets
Other assets	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange stock
Assets
Other assets	2,848	2,417
Significant Other Observable Inputs (Level 2)
Assets
Financial instruments owned, at fair value	3,882,972	3,944,607
Financial instruments owned and pledged	361,675	394,337
Other assets	0	0
Liabilities
Financial instruments sold, not yet purchased	3,743,742	4,139,877
Significant Other Observable Inputs (Level 2) | Currency forwards
Assets
Financial instruments owned, at fair value	2,407,155	2,792,373
Liabilities
Financial instruments sold, not yet purchased	2,402,231	2,720,749
Significant Other Observable Inputs (Level 2) | Options
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Other Observable Inputs (Level 2) | Equity securities
Assets
Financial instruments owned, at fair value	1,338,106	1,022,221
Financial instruments owned and pledged	310,392	359,036
Liabilities
Financial instruments sold, not yet purchased	1,150,367	1,336,338
Significant Other Observable Inputs (Level 2) | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	14,716	14,547
Financial instruments owned and pledged		0
Liabilities
Financial instruments sold, not yet purchased	2,905	3,054
Significant Other Observable Inputs (Level 2) | Corporate Bonds
Assets
Financial instruments owned, at fair value	104,667	87,500
Liabilities
Financial instruments sold, not yet purchased	170,432	40,123
Significant Other Observable Inputs (Level 2) | Exchange traded notes
Assets
Financial instruments owned, at fair value	18,328	27,966
Financial instruments owned and pledged	51,283	35,301
Liabilities
Financial instruments sold, not yet purchased	17,807	39,613
Significant Other Observable Inputs (Level 2) | Equity investment
Assets
Other assets	0	0
Significant Other Observable Inputs (Level 2) | Exchange stock
Assets
Other assets	0	0
Significant Unobservable Inputs (Level 3)
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned and pledged	0	0
Other assets	46,351	45,856
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Currency forwards
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Options
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Equity securities
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned and pledged	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | U.S. and Non-U.S. government obligations
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned and pledged		0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Corporate Bonds
Assets
Financial instruments owned, at fair value	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Exchange traded notes
Assets
Financial instruments owned, at fair value	0	0
Financial instruments owned and pledged	0	0
Liabilities
Financial instruments sold, not yet purchased	0	0
Significant Unobservable Inputs (Level 3) | Equity investment
Assets
Other assets	46,351	45,856
Significant Unobservable Inputs (Level 3) | Exchange stock
Assets
Other assets	$ 0	$ 0

Financial Assets and Liabilit_4

Financial Assets and Liabilities - SBI Investment (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Transfers of financial instruments between levels	$ 0	$ 0
SBI
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Discount rate applied to cash flow forecasts to determine initial fair value of equity method investment.	15.00%
Market approach average price/earnings multiples of comparable companies to corroborate the income approach	12.6
Time period of projected income to determine fair value of equity method investment	5 years

Financial Assets and Liabilit_5

Financial Assets and Liabilities - Not Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 458,064	$ 729,547
Cash restricted or segregated under regulations and other	39,497	6,500
Securities borrowed	1,201,327	1,399,684
Securities purchased under agreements to resell	22,974	15,475
Receivables from broker-dealers and clearing organizations	1,287,091	1,101,449
Total assets	9,081,397	7,380,978
Liabilities
Short-term borrowings	146,847	15,128
Long-term borrowings	1,931,811	907,037
Securities loaned	778,351	1,130,039
Securities sold under agreements to repurchase	295,803	281,861
Payables to broker-dealers and clearing organizations	668,545	567,441
Total liabilities	7,729,528	5,886,279
Carrying Value
Assets
Cash and cash equivalents	458,064	736,047
Cash restricted or segregated under regulations and other	39,497
Securities borrowed	1,201,327	1,399,684
Securities purchased under agreements to resell	22,974	15,475
Receivables from broker-dealers and clearing organizations	1,287,091	1,101,449
Total assets	3,008,953	3,252,655
Liabilities
Short-term borrowings	146,847	15,128
Long-term borrowings	1,931,811	907,037
Securities loaned	778,351	1,130,039
Securities sold under agreements to repurchase	295,803	281,861
Payables to broker-dealers and clearing organizations	668,545	567,441
Total liabilities	3,821,357	2,901,506
Fair Value
Assets
Cash and cash equivalents	458,064	736,047
Cash restricted or segregated under regulations and other	39,497
Securities borrowed	1,201,327	1,399,684
Securities purchased under agreements to resell	22,974	15,475
Receivables from broker-dealers and clearing organizations	1,287,091	1,101,449
Total assets	3,008,953	3,252,655
Liabilities
Short-term borrowings	146,847	15,128
Long-term borrowings	2,003,866	916,465
Securities loaned	778,351	1,130,039
Securities sold under agreements to repurchase	295,803	281,861
Payables to broker-dealers and clearing organizations	668,545	567,441
Total liabilities	3,893,412	2,910,934
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and cash equivalents	458,064	736,047
Cash restricted or segregated under regulations and other	39,497
Securities borrowed	0	0
Securities purchased under agreements to resell	0	0
Receivables from broker-dealers and clearing organizations	39,394	71,288
Total assets	536,955	807,335
Liabilities
Short-term borrowings	0	0
Long-term borrowings	0	0
Securities loaned	0	0
Securities sold under agreements to repurchase	0	0
Payables to broker-dealers and clearing organizations	15,876	1,031
Total liabilities	15,876	1,031
Fair Value | Significant Other Observable Inputs (Level 2)
Assets
Cash and cash equivalents	0	0
Cash restricted or segregated under regulations and other	0
Securities borrowed	1,201,327	1,399,684
Securities purchased under agreements to resell	22,974	15,475
Receivables from broker-dealers and clearing organizations	1,247,697	1,030,161
Total assets	2,471,998	2,445,320
Liabilities
Short-term borrowings	146,847	15,128
Long-term borrowings	2,003,866	916,465
Securities loaned	778,351	1,130,039
Securities sold under agreements to repurchase	295,803	281,861
Payables to broker-dealers and clearing organizations	652,669	566,410
Total liabilities	3,877,536	2,909,903
Fair Value | Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents	0	0
Cash restricted or segregated under regulations and other	0
Securities borrowed	0	0
Securities purchased under agreements to resell	0	0
Receivables from broker-dealers and clearing organizations	0	0
Total assets	0	0
Liabilities
Short-term borrowings	0	0
Long-term borrowings	0	0
Securities loaned	0	0
Securities sold under agreements to repurchase	0	0
Payables to broker-dealers and clearing organizations	0	0
Total liabilities	$ 0	$ 0

Financial Assets and Liabilit_6

Financial Assets and Liabilities - Level 3 financial instruments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 45,856	$ 40,588
Purchases	0	0
Total Realized and Unrealized Gains / (Losses)	495	505
Net Transfers into (out of) Level 3	0	0
Settlement	0	0
Ending Balance	46,351	41,093
Change in Net Unrealized Gains / (Losses) on Investments still held at end of period	495	505
Equity investment
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	45,856	40,588
Purchases	0	0
Total Realized and Unrealized Gains / (Losses)	495	505
Net Transfers into (out of) Level 3	0	0
Settlement	0	0
Ending Balance	46,351	41,093
Change in Net Unrealized Gains / (Losses) on Investments still held at end of period	$ 495	$ 505

Financial Assets and Liabilit_7

Financial Assets and Liabilities - Netting of Certain Financial Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities borrowed
Gross Amounts of Recognized Assets	$ 1,201,327	$ 1,399,684
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	1,201,327	1,399,684
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(1,173,186)	(1,361,635)
Cash Collateral Received	(1,691)	(8,822)
Net Amount	26,450	29,227
Securities purchased under agreements to resell
Gross Amounts of Recognized Assets	22,974	15,475
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	22,974	15,475
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(22,974)	(15,475)
Cash Collateral Received	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Assets	3,635,121	4,219,431
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(2,384,305)	(2,790,242)
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	1,250,816	1,429,189
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(1,199,825)	(1,389,009)
Cash Collateral Received	(1,691)	(8,822)
Net Amount	49,300	31,358
Currency forwards
Trading assets, at fair value:
Gross Amounts of Recognized Assets	2,407,155	2,792,373
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(2,384,305)	(2,790,242)
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	22,850	2,131
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	0	0
Cash Collateral Received	0	0
Net Amount	22,850	2,131
Options
Trading assets, at fair value:
Gross Amounts of Recognized Assets	3,665	11,899
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Statement of Financial Condition	3,665	11,899
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(3,665)	(11,899)
Cash Collateral Received	0	0
Net Amount	$ 0	$ 0

Financial Assets and Liabilit_8

Financial Assets and Liabilities - Netting of Certain Financial Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities loaned
Gross Amounts of Recognized Liabilities	$ 778,351	$ 1,130,039
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	778,351	1,130,039
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(728,309)	(1,108,461)
Cash Collateral Pledged	(6,644)	(8,822)
Net Amount	43,398	12,756
Securities sold under agreements to repurchase
Gross Amounts of Recognized Liabilities	295,803	281,861
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	295,803	281,861
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(295,803)	(281,861)
Cash Collateral Pledged	0	0
Net Amount	0	0
Total
Gross Amounts of Recognized Liabilities	3,479,964	4,143,700
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(2,390,972)	(2,719,954)
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	1,088,992	1,423,746
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(1,027,691)	(1,401,373)
Cash Collateral Pledged	(6,644)	(9,614)
Net Amount	54,657	12,759
Currency forwards
Trading liabilities, at fair value:
Gross Amounts of Recognized Liabilities	2,402,231	2,720,749
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	(2,390,972)	(2,719,954)
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	11,259	795
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	0	0
Cash Collateral Pledged	0	(792)
Net Amount	11,259	3
Options
Trading liabilities, at fair value:
Gross Amounts of Recognized Liabilities	3,579	11,051
Gross Amounts Offset in the Condensed Consolidated Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Condensed Consolidated Statement of Financial Condition	3,579	11,051
Gross Amounts Not Offset in the Condensed Consolidated Statement of Financial Condition
Financial Instruments	(3,579)	(11,051)
Cash Collateral Pledged	0	0
Net Amount	$ 0	$ 0

Financial Assets and Liabilit_9

Financial Assets and Liabilities - Gross Obligations For Securities Lending Transactions (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	$ 295,803	$ 281,861
Remaining contractual maturity for securities loaned	778,351	1,130,039
Overnight and Continuous
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	5,803	11,861
Remaining contractual maturity for securities loaned	778,351	1,130,039
Less than 30 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	65,000	45,000
Remaining contractual maturity for securities loaned	0	0
30 - 60 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	65,000	65,000
Remaining contractual maturity for securities loaned	0	0
61 - 90 Days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	160,000	160,000
Remaining contractual maturity for securities loaned	0	0
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	290,000	270,000
Remaining contractual maturity for securities loaned	778,351	1,130,039
Equity securities | Overnight and Continuous
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	0	0
Remaining contractual maturity for securities loaned	778,351	1,130,039
Equity securities | Less than 30 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	65,000	45,000
Remaining contractual maturity for securities loaned	0	0
Equity securities | 30 - 60 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	65,000	65,000
Remaining contractual maturity for securities loaned	0	0
Equity securities | 61 - 90 Days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	160,000	160,000
Remaining contractual maturity for securities loaned	0	0
U.S. and Non-U.S. government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	5,803	11,861
U.S. and Non-U.S. government obligations | Overnight and Continuous
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	5,803	11,861
U.S. and Non-U.S. government obligations | Less than 30 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	0	0
U.S. and Non-U.S. government obligations | 30 - 60 days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	0	0
U.S. and Non-U.S. government obligations | 61 - 90 Days
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Remaining contractual maturity for securities sold under agreements to repurchase	$ 0	$ 0

Derivative Instruments - Fair V

Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Equities futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	$ 1,426	$ (15,382)
Derivatives Assets, Notional	2,902,864	2,891,606
Equities futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	(302)	468
Derivatives Liabilities, Notional	160,909	106,487
Commodity futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	39,317	69,235
Derivatives Assets, Notional	9,777,946	11,595,215
Commodity futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	(11,522)	(375)
Derivatives Liabilities, Notional	5,129,312	54,782
Currency futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	(36)	(9,432)
Derivatives Assets, Notional	2,401,655	3,756,914
Currency futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	(4,790)	(30,643)
Derivatives Liabilities, Notional	2,543,167	6,239,725
Fixed income futures | Derivative instruments not designated as hedging instruments | Receivables from broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	3	(28)
Derivatives Assets, Notional	553	18,694
Fixed income futures | Derivative instruments not designated as hedging instruments | Payables to broker-dealers and clearing organizations
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	0	93
Derivatives Liabilities, Notional	0	8,591
Options
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	3,665	11,899
Derivatives Liabilities, Fair Value	3,579	11,051
Options | Derivative instruments not designated as hedging instruments | Financial instruments owned
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	3,665	11,899
Derivatives Assets, Notional	296,807	659,101
Options | Derivative instruments not designated as hedging instruments | Financial instruments sold, not yet purchased
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	3,579	11,051
Derivatives Liabilities, Notional	310,548	608,756
Currency forwards
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	2,407,155	2,792,373
Derivatives Liabilities, Fair Value	2,402,231	2,720,749
Currency forwards | Derivative instruments not designated as hedging instruments | Financial instruments owned
Derivatives, Fair Value [Line Items]
Derivatives Assets, Fair Value	2,407,155	2,792,373
Derivatives Assets, Notional	174,182,937	171,288,432
Currency forwards | Derivative instruments not designated as hedging instruments | Financial instruments sold, not yet purchased
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	2,402,231	2,720,749
Derivatives Liabilities, Notional	174,180,475	171,252,224
Currency forwards | Derivative instruments designated as hedging instruments | Financial instruments sold, not yet purchased
Derivatives, Fair Value [Line Items]
Derivatives Liabilities, Fair Value	0	(792)
Derivatives Liabilities, Notional	$ 0	$ 13,501

Derivative Instruments - Gain F

Derivative Instruments - Gain From Derivative Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	$ 66,691	$ 107,900	$ 115,565	$ (241,654)
Futures | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	83,225	6,909	155,610	(429,506)
Currency forwards | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	(20,869)	110,828	(45,042)	196,588
Options | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain impact that derivative instruments not designated as hedging instruments had on results of operations	4,335	(9,837)	4,997	(8,736)
Foreign exchange - forward contract | Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Net gain from derivative instruments, which are recorded in accumulated other comprehensive income	$ 0	$ 6	$ 0	$ 156

Revenues from Contracts with _3

Revenues from Contracts with Customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	$ 145,120,000	$ 46,565,000	$ 220,267,000	$ 100,409,000
Total revenue	378,456,000	328,126,000	741,448,000	1,143,179,000
Revenue related to performance obligations satisfied in previous periods	500,000		500,000
Receivables related to revenue from contracts with customers	57,000,000		57,000,000		$ 1,700,000
Impairment losses on receivables			0
Deferred revenue related to contracts with customers	11,900,000		11,900,000
Revenue recognized	7,800,000		14,900,000
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	358,195,000		714,398,000
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	20,261,000		27,050,000
Commissions, net
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	108,688,000		171,443,000
Workflow technology
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	25,455,000		34,327,000
Analytics
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	10,977,000		14,497,000
Other sources of revenue
Disaggregation of Revenue [Line Items]
Total revenue	233,336,000		521,181,000
Market Making
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	4,961,000		9,961,000
Total revenue	235,004,000	287,695,000	514,225,000	720,231,000
Market Making | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	235,004,000		514,225,000
Market Making | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0		0
Market Making | Commissions, net
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	4,961,000		9,961,000
Market Making | Workflow technology
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0		0
Market Making | Analytics
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0		0
Market Making | Other sources of revenue
Disaggregation of Revenue [Line Items]
Total revenue	230,043,000		504,264,000
Execution Services
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	140,159,000		210,306,000
Total revenue	142,024,000	40,774,000	225,542,000	424,553,000
Execution Services | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	121,763,000		198,492,000
Execution Services | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	20,261,000		27,050,000
Execution Services | Commissions, net
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	103,727,000		161,482,000
Execution Services | Workflow technology
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	25,455,000		34,327,000
Execution Services | Analytics
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	10,977,000		14,497,000
Execution Services | Other sources of revenue
Disaggregation of Revenue [Line Items]
Total revenue	1,865,000		15,236,000
Corporate
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0		0
Total revenue	1,428,000	$ (343,000)	1,681,000	$ (1,605,000)
Corporate | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	1,428,000		1,681,000
Corporate | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	0		0
Corporate | Commissions, net
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0		0
Corporate | Workflow technology
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0		0
Corporate | Analytics
Disaggregation of Revenue [Line Items]
Revenues from contract with customers	0		0
Corporate | Other sources of revenue
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,428,000		$ 1,681,000

Income Taxes (Details)

Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ (11,094,000)	$ 3,000,000	$ (13,679,000)	$ 61,515,000
Effective tax rate	16.70%	6.00%	16.50%	13.10%
Current income taxes receivable	$ 62,600,000		$ 62,600,000		$ 41,100,000
Current taxes payable	13,600,000		13,600,000		10,000,000
Operating loss carryforwards	239,300,000		239,300,000		239,300,000
Deferred tax asset, non-U.S. operating loss carryforward	44,900,000		44,900,000		44,900,000
Valuation allowance on deferred taxes	0		0		$ 0
Unrecognized tax benefits that would impact effective tax rate	$ 9,200,000		$ 9,200,000

Commitments, Contingencies an_2

Commitments, Contingencies and Guarantees (Details) € in Millions, $ in Millions	Jun. 26, 2019USD ($)	Apr. 29, 2019lawsuit	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2017USD ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2015USD ($)	Dec. 31, 2015EUR (€)
Commitments and Contingencies Disclosure [Abstract]
Amount of fine			$ 3.4	€ 3	$ 3.9	€ 3.3	$ 5.4	€ 5
ProShares Trust II Securities Litigation, No. 19-cv-886-DLC
Loss Contingencies [Line Items]
Number of lawsuits consolidated | lawsuit		3
Breach of Non-Disparagement Clause by Former Employee
Loss Contingencies [Line Items]
Damages sought | $	$ 65

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Termination of office leases		$ 65,200
Impairment of ROU Asset	$ 25,857	25,857
Write-offs of leasehold improvements and fixed assets		37,900
Dilapidation charges		$ 1,400
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	1 year	1 year
Sublease, term of contract	1 year	1 year
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, term of contract	13 years	13 years
Sublease, term of contract	13 years	13 years

Leases - Lease Assets and Liabi

Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating leases
Operating lease right-of-use assets	$ 318,269	$ 0
Operating lease liabilities	388,070	$ 0
Finance leases
Property and equipment, at cost	37,258
Accumulated depreciation	(20,139)
Finance lease liabilities	$ 17,566

Leases - Lease Term and Discoun

Leases - Lease Term and Discount Rate (Details)	Jun. 30, 2019
Operating leases
Weighted average remaining lease term	7 years 10 months 2 days
Weighted average discount rate	5.70%
Finance leases
Weighted average remaining lease term	1 year 7 months 20 days
Weighted average discount rate	3.58%

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Operating lease cost:
Fixed	$ 19,288	$ 34,084
Variable	1,869	3,447
Impairment of ROU Asset	25,857	25,857
Total Operating lease cost	47,014	63,388
Finance lease cost:
Amortization of right-of-use assets	3,082	6,052
Interest on lease liabilities	175	361
Total Finance lease cost	3,257	6,413
Sublease income	$ 3,355	$ 5,915

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases
2019	$ 37,768
2020	75,066
2021	71,830
2022	65,920
2023	63,178
2024 and thereafter	171,840
Total lease payments	485,602
Less imputed interest	(97,532)
Total lease liability	388,070	$ 0
Finance Lease, Liability, Payment, Due [Abstract]
2019	6,784
2020	10,062
2021	2,436
2022	131
2023	0
2024 and thereafter	0
Total lease payments	19,413
Less imputed interest	(1,847)
Total lease liability	$ 17,566
2019		21,983
2020		11,283
2021		1,651
2022		0
2023		0
Thereafter		0
Total minimum lease payments		34,917
2019		32,755
2020		30,473
2021		25,564
2022		22,710
2023		21,456
Thereafter		113,779
Total minimum lease payments		246,737
2019		(8,979)
2020		(9,324)
2021		(8,844)
2022		(8,552)
2023		(8,695)
Thereafter		(36,312)
Total minimum lease payments		$ (80,706)

Cash (Details)

Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 458,064	$ 729,547
Cash restricted or segregated under regulations and other	39,497	6,500
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 497,561	$ 736,047	$ 660,067	$ 532,887

Capital Structure - Additional

Capital Structure - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019voteclassshares	Jun. 30, 2018shares	Dec. 31, 2018shares
Class of Stock [Line Items]
Number of classes of common stock | class	4,000,000
Non-voting common interest units outstanding (in shares) | shares	8,150,771		8,760,755
Number of non-voting common interest units forfeited or repurchased (in shares) | shares	609,984	2,958,931
Class A common stock and Class C common stock
Class of Stock [Line Items]
Number of votes | vote	1
Class B common stock and Class D common stock
Class of Stock [Line Items]
Number of votes | vote	10

Capital Structure - Amended and

Capital Structure - Amended and Restated 2015 Management Incentive Plan (Details)	Apr. 21, 2015shares
2015 Management Incentive Plan | Class A
Class of Stock [Line Items]
Number of shares of stock authorized (in shares)	16,000,000

Capital Structure - Amended a_2

Capital Structure - Amended and Restated Investment Technology Group, Inc. 2007 Omnibus Equity Compensation Plan (Details) - Assumed Awards - Class A	Mar. 01, 2019shares
Class of Stock [Line Items]
Number of shares of stock authorized	2,497,028
Number of shares remaining to be issued	1,230,406

Capital Structure - Acquisition

Capital Structure - Acquisition of KCG (Details) - Class A - USD ($) $ in Millions	Jul. 20, 2017	May 31, 2018
Class of Stock [Line Items]
Number of shares of stock issued (in shares)		10,518,750
KCG | Aranda
Class of Stock [Line Items]
Number of shares of stock issued (in shares)	8,012,821
Aggregate purchase price	$ 125
KCG | North Island Stockholder
Class of Stock [Line Items]
Number of shares of stock issued (in shares)	40,064,103
Aggregate purchase price	$ 618.7

Capital Structure - Share Repur

Capital Structure - Share Repurchase Program (Details) - USD ($) shares in Millions	Jul. 27, 2018	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Feb. 28, 2018
Class of Stock [Line Items]
Authorized repurchase amount	$ 100,000,000
Increase in authorized repurchase amount	$ 50,000,000
Value of shares repurchased		$ 2,093,000	$ 8,805,000	$ 29,520,000	$ 14,444,000
Class A
Class of Stock [Line Items]
Authorized repurchase amount							$ 50,000,000
Number of shares repurchased						2.6
Value of shares repurchased						$ 65,900,000
Remaining capacity for future purchases		$ 34,100,000				$ 34,100,000

Capital Structure - Secondary O

Capital Structure - Secondary Offerings (Details) - Class A - $ / shares	1 Months Ended
	May 31, 2018	May 31, 2019
Class of Stock [Line Items]
Number of shares issued (in shares)	17,250,000	9,000,000
Purchase price per share (in dollars per share)	$ 27.16	$ 22
Offering price per share (in dollars per share)	$ 28
Number of shares of stock issued (in shares)	10,518,750
Selling Stockholders
Class of Stock [Line Items]
Number of shares of stock issued (in shares)	6,731,250
Number of shares issued upon exercise of stock options (in shares)	2,081,250

Capital Structure - Employee Ex

Capital Structure - Employee Exchanges (Details)	6 Months Ended
	Jun. 30, 2019shares	Jun. 30, 2018shares
Virtu Financial
Class of Stock [Line Items]
Ownership interest (as a percent)	62.00%
VFH
Class of Stock [Line Items]
Common stock exchange ratio	1
VFH | Class A
Class of Stock [Line Items]
Issuance of common stock in connection with employee exchanges (in shares)	609,984	3,508,217

Share-based Compensation - Narr

Share-based Compensation - Narrative (Details) - USD ($) $ in Millions	Apr. 21, 2015	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Mar. 01, 2019
Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized		$ (0.2)	$ 0.8	$ 2.5	$ 4.7
Granted (in shares)				423,393	594,536
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share-based compensation expense		67.9		$ 67.9		$ 21.3
Weighted average period for compensation expense expected to be recognized				2 years		1 year 8 months 12 days
RSUs | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized		$ 16.4	4.5	$ 39.6	$ 8.4
2015 Management Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				156,129
2015 Management Incentive Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Expiration period	10 years
Expense recognized			$ 1.5	$ 1.4	$ 2.9
Unrecognized share-based compensation expense						$ 1.6
Weighted average period for compensation expense expected to be recognized						3 months 18 days
2015 Management Incentive Plan | RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Assumed Plan | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance		1,230,406		1,230,406			2,497,028

Share-based Compensation - Summ

Share-based Compensation - Summary of Activity in Options (Details) - 2015 Management Incentive Plan - $ / shares	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Number of Options
Outstanding at beginning of period (in shares)	3,486,150	7,783,000	7,783,000
Granted (in shares)	156,129
Exercised (in shares)	(353,500)	(4,049,058)
Forfeited or expired (in shares)	(40,000)	(83,750)
Outstanding at end of period (in shares)	3,248,779	3,650,192	3,486,150	7,783,000
Weighted Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 19	$ 19	$ 19
Granted (in dollars per share)	13.60
Exercised (in dollars per share)	19	19
Outstanding at end of period (in dollars per share)	$ 18.74	$ 19	$ 19	$ 19
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life	5 years 8 months 26 days	6 years 9 months 18 days	6 years 3 months 18 days	7 years 3 months 14 days
Weighted Average Remaining Contractual Life, Granted	4 years 10 months 13 days
Options Exercisable, Number of Options (in shares)	3,248,779	1,779,442	1,660,400	3,891,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 18.74	$ 19	$ 19	$ 19

Share-based Compensation - Su_2

Share-based Compensation - Summary of Activity in RSUs (Details) - 2015 Management Incentive Plan - RSUs - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Number of Shares
Outstanding at beginning of period (in shares)	1,378,922	853,047
Granted (in shares)	3,305,045	1,070,917
Forfeited (in shares)	(189,149)	(127,493)
Vested (in shares)	(820,287)	0
Outstanding at end of period (in shares)	3,674,531	1,796,471
Weighted Average Fair Value
Outstanding at beginning of period (in dollars per share)	$ 20.03	$ 17.94
Granted (in dollars per share)	25.76	20.93
Forfeited (in dollars per share)	20.97	18.30
Vested (in dollars per share)	23.81	0
Outstanding at end of period (in dollars per share)	$ 24.29	$ 19.70

Regulatory Requirement - Narrat

Regulatory Requirement - Narrative (Details)	6 Months Ended
	Jun. 30, 2019USD ($)broker_dealer	Nov. 03, 2017broker_dealer
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Number of broker-dealer subsidiaries | broker_dealer	5	3
Virtu Financial Capital Markets LLC
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum capital required to be maintained in connection with the operation of the Company's DMM business	$ 1,150,000
Required amount under exchange rules	1,000,000
Required amount under exchange rules for every 0.1% NYSE transaction dollar volume	$ 75,000
Percentage of NYSE transaction dollar volume	0.10%
VAL
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash in special reserve bank accounts for the benefit of customers	$ 23,000,000
Cash in reserve bank accounts for the benefit of proprietary accounts of brokers	1,000,000
VITG
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Cash in special reserve bank accounts for the benefit of customers	7,400,000
Cash in reserve bank accounts for the benefit of proprietary accounts of brokers	$ 4,400,000

Regulatory Requirement - Regula

Regulatory Requirement - Regulatory Capital and Capital Requirements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Virtu Americas LLC
Entity Information [Line Items]
Regulatory Capital	$ 328,965	$ 381,211
Regulatory Capital Requirement	4,406	2,035
Excess Regulatory Capital	324,559	379,176
Virtu Financial BD LLC
Entity Information [Line Items]
Regulatory Capital	101,477	133,850
Regulatory Capital Requirement	1,000	1,000
Excess Regulatory Capital	100,477	132,850
Virtu Financial Capital Markets LLC
Entity Information [Line Items]
Regulatory Capital	9,633	9,457
Regulatory Capital Requirement	1,000	1,000
Excess Regulatory Capital	8,633	$ 8,457
Virtu ITG LLC
Entity Information [Line Items]
Regulatory Capital	45,020
Regulatory Capital Requirement	1,000
Excess Regulatory Capital	44,020
Virtu Alternet Securities LLC
Entity Information [Line Items]
Regulatory Capital	2,189
Regulatory Capital Requirement	100
Excess Regulatory Capital	2,089
Virtu ITG Canada Corp | Canada
Entity Information [Line Items]
Regulatory Capital	17,854
Regulatory Capital Requirement	191
Excess Regulatory Capital	17,663
TriAct Canada Marketplace LP | Canada
Entity Information [Line Items]
Regulatory Capital	1,518
Regulatory Capital Requirement	191
Excess Regulatory Capital	1,327
Virtu Financial Canada ULC | Canada
Entity Information [Line Items]
Regulatory Capital	2,591
Regulatory Capital Requirement	191
Excess Regulatory Capital	2,400
Virtu ITG Europe Limited | Ireland
Entity Information [Line Items]
Regulatory Capital	52,855
Regulatory Capital Requirement	31,324
Excess Regulatory Capital	21,531
Virtu Financial Ireland Limited | Ireland
Entity Information [Line Items]
Regulatory Capital	79,308
Regulatory Capital Requirement	35,537
Excess Regulatory Capital	43,771
Virtu ITG UK Limited | United Kingdom
Entity Information [Line Items]
Regulatory Capital	1,335
Regulatory Capital Requirement	952
Excess Regulatory Capital	383
KCG Europe Limited | United Kingdom
Entity Information [Line Items]
Regulatory Capital	50,672
Regulatory Capital Requirement	32,000
Excess Regulatory Capital	18,672
Virtu ITG Australia Limited | Asia Pacific
Entity Information [Line Items]
Regulatory Capital	26,682
Regulatory Capital Requirement	14,545
Excess Regulatory Capital	12,137
Virtu ITG Hong Kong Limited | Asia Pacific
Entity Information [Line Items]
Regulatory Capital	2,071
Regulatory Capital Requirement	538
Excess Regulatory Capital	1,533
Virtu ITG Singapore Pte Limited | Asia Pacific
Entity Information [Line Items]
Regulatory Capital	1,034
Regulatory Capital Requirement	74
Excess Regulatory Capital	$ 960

Geographic Information and Bu_3

Geographic Information and Business Segments - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	Jan. 02, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers [Line Items]
Total revenue		$ 378,456	$ 328,126	$ 741,448	$ 1,143,179
BondPoint | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Revenues from External Customers [Line Items]
Gain on sale of BondPoint	$ 337,550				337,600
United States
Revenues from External Customers [Line Items]
Total revenue		274,074	277,263	565,410	1,020,414
Ireland
Revenues from External Customers [Line Items]
Total revenue		48,890	24,601	84,565	38,624
United Kingdom
Revenues from External Customers [Line Items]
Total revenue		(817)	3,245	(533)	14,845
Singapore
Revenues from External Customers [Line Items]
Total revenue		29,707	22,626	56,545	68,837
Canada
Revenues from External Customers [Line Items]
Total revenue		15,088	0	20,300	0
Australia
Revenues from External Customers [Line Items]
Total revenue		10,591	0	13,893	0
Others
Revenues from External Customers [Line Items]
Total revenue		$ 923	$ 391	$ 1,268	$ 459

Geographic Information and Bu_4

Geographic Information and Business Segments - Narrative (Details)	6 Months Ended
	Jun. 30, 2019segment
Segment Reporting [Abstract]
Number of operating segments	2
Number of non-operating segments	1

Geographic Information and Bu_5

Geographic Information and Business Segments - Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Total revenue	$ 378,456	$ 328,126	$ 741,448	$ 1,143,179
Income (loss) before income taxes and noncontrolling interest	(66,579)	49,622	(82,783)	518,160
Market Making
Segment Reporting Information [Line Items]
Total revenue	235,004	287,695	514,225	720,231
Income (loss) before income taxes and noncontrolling interest	21,962	60,003	69,501	223,166
Execution Services
Segment Reporting Information [Line Items]
Total revenue	142,024	40,774	225,542	424,553
Income (loss) before income taxes and noncontrolling interest	(21,697)	389	(66,102)	331,574
Corporate
Segment Reporting Information [Line Items]
Total revenue	1,428	(343)	1,681	(1,605)
Income (loss) before income taxes and noncontrolling interest	$ (66,844)	$ (10,770)	$ (86,182)	$ (36,580)

Related Party Transactions (Det

Related Party Transactions (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)joint_venture	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)joint_venture	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Related Party Transaction [Line Items]
Payable to affiliates	$ 1.2		$ 1.2		$ 3
Two microwave communication network JVs
Related Party Transaction [Line Items]
Payments to related party	$ 5.2	$ 4.4	$ 10.4	$ 10.1
Number of microwave communication network JVs the Company makes payments to | joint_venture	2		2
Level 3
Related Party Transaction [Line Items]
Payments for purchases	$ 0.5	0.8	$ 0.8	1.5
SBI
Related Party Transaction [Line Items]
Payments to related party	$ 2.7	$ 2.3	$ 6.1	$ 4.6

Subsequent Events (Details)

Subsequent Events (Details)	Aug. 08, 2019$ / shares
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.24