Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net Income	$ 18,898	$ 158,340	$ 197,490
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	47,327	29,703	33,629
Amortization of purchased intangibles and acquired capitalized software	15,447	211	211
Debt issue cost related to debt refinancing	10,460	5,579
Amortization of debt issuance costs and deferred financing fees	5,822	1,690	1,755
Termination of office leases	3,671		1,380
Share based compensation	26,259	22,866	61,878
Reserve for legal matter	657		5,440
Equipment writeoff	1,216	428	559
Tax receivable agreement obligation reduction	(86,599)
Deferred taxes	102,973	13,313	3,985
Other	(4,577)	(1,070)	219
Changes in operating assets and liabilities:
Securities borrowed	155,277	233,291	31,638
Securities purchased under agreements to resell	16,894	14,981	16,482
Receivables from broker dealers and clearing organizations	26,145	27,808	(88,884)
Trading assets, at fair value	1,210,599	(530,668)	247,094
Other Assets	44,494	772	(5,796)
Securities loaned	366,295	(302,400)	26,741
Securities sold under agreements to repurchase	(450,964)		(2,006)
Payables to broker dealers and clearing organizations	(516,376)	209,374	(199,599)
Trading liabilities, at fair value	(721,204)	370,065	(58,544)
Accounts payable and accrued expenses and other liabilities	17,860	(14,684)	(13,392)
Net cash provided by operating activities	290,574	239,599	260,280
Cash flows from investing activities
Development of capitalized software	(14,158)	(8,404)	(8,028)
Acquisition of property and equipment	(18,932)	(11,859)	(16,271)
Investment in SBI Japannext		(38,754)
Acquisition of KCG Holdings, net of cash acquired, described in Note 3	(799,632)
Acquisition of Teza Technologies	(5,594)
Proceeds from sale of DMM business	300
Net cash used in investing activities	(838,016)	(59,017)	(24,299)
Cash flows from financing activities
Distribution to members			(130,000)
Distribution from Virtu Financial to non-controlling interest	(89,563)	(162,969)	(81,377)
Dividends	(63,814)	(37,759)	(17,362)
Purchase of treasury stock	(2,683)	(4,539)	(3,819)
Short-term borrowings, net	7,000	(20,000)	45,000
Proceeds from long-term borrowings	1,115,036	75,753
Repayment of senior secured credit facility	(256,473)	(3,825)	(2,914)
Repayment of KCG Notes	(480,987)
Tax receivable agreement obligations	(7,045)
Debt issuance costs	(56,505)	(5,094)	(976)
Issuance of common stock, net of offering costs	735,974		327,366
Repurchase of Virtu Financial Units and corresponding number of Class A and C Common Stock			(277,153)
Issuance of common stock, net of offering costs		16,677	7,782
Repurchase of Virtu Financial Units and corresponding number of Class A and C common stock in connection with IPO		(17,383)	(8,805)
Net cash provided by (used in) financing activities	889,797	(161,237)	(144,355)
Effect of exchange rate changes on cash and cash equivalents	9,117	(1,165)	(4,255)
Net decrease in Cash and cash equivalents	351,472	18,180	87,371
Cash and cash equivalents beginning of period	181,415	163,235	75,864
Cash and Cash Equivalents, at Carrying Value	181,415	163,235	75,864
Supplementary disclosure of cash flow information
Cash paid for interest	112,982	54,872	63,230
Cash paid for taxes	5,976	16,175	12,875
Non-cash investing activities
Share based compensation of developers relating to software capitalized	1,605	2,750	11,278
Non-cash financing activities
Tax receivable agreement described in Note 6	1,534	545	(21,854)
Class A-2
Cash flows from financing activities
Purchase of treasury stock	$ (11,143)	(2,000)	$ (2,097)
Class C
Cash flows from financing activities
Purchase of treasury stock		$ (98)