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Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		12 Months Ended		23 Months Ended
	Apr. 21, 2015	Jul. 08, 2011	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2017
Share-based Compensation.
Number of Class A-2 capital interests contributed by Class A-2 members to Virtu East MIP LLC		2,625,000
Non-voting common interest units outstanding			13,502,263		14,231,535		13,502,263
Class A
Share-based Compensation.
Expense recognized				$ 3,400
Class A-2 profits interests and Class B interests | East MIP
Weighted-average assumptions used in estimating grant date fair values
Expected life (in years)			2 years 8 months 12 days	6 months
Weighted average risk free interest rate (as a percent)			0.72%	0.12%
Expected stock price volatility (as a percent)			47.00%	25.00%
Class A-2 profits interests | Maximum
Share-based Compensation.
Vesting period			4 years	4 years
Class B interests | East MIP
Share-based Compensation.
Amortization expense related to share based compensation			$ 20	$ 300
Class B interests | East MIP | Time based vesting
Share-based Compensation.
Vesting period		4 years
Non-voting common interest units (formerly Class B interests)
Share-based Compensation.
Expense recognized			200	300
Unrecognized share-based compensation expense			$ 600		$ 800		$ 600
Weighted average period for compensation expense expected to be recognized			9 months 18 days		1 year
Capitalized software development costs			$ 10	100
Non-voting common interest units (formerly Class A 2 profits interests)
Share-based Compensation.
Expense recognized			200	$ 400
Unrecognized share-based compensation expense			$ 500		$ 800		$ 500
Weighted average period for compensation expense expected to be recognized			7 months 6 days		9 months 18 days
Non-qualified stock options
Share-based Compensation.
Expense recognized			$ 1,400
Forfeited or repurchased (in shares)			195,000	625,000
Outstanding (in shares)			8,234,000	8,994,000	8,994,000
Forfeited or expired (in shares)			(195,000)	(625,000)
Outstanding (in shares)			8,039,000	8,369,000	8,234,000	8,994,000	8,039,000
Weighted Average Exercise Price Per Share
Outstanding (in dollars per share)			$ 19.00	$ 19.00	$ 19.00
Outstanding (in dollars per share)			$ 19.00	$ 19.00	$ 19.00	$ 19.00	$ 19.00
Weighted-average assumptions used in estimating grant date fair values
Expected life (in years)			6 years 3 months
Weighted average risk free interest rate (as a percent)			1.52%
Expected stock price volatility (as a percent)			30.00%
Expected dividend yield (as a percent)			5.05%
Weighted Average Fair Value
Outstanding (in dollars per share)			$ 3.02				$ 3.02
Weighted Average Remaining Life, outstanding
Weighted Average Remaining Life			8 years 18 days	9 years 18 days	8 years 3 months 15 days	9 years 3 months 15 days
Options Exercisable, Number of Options (in shares)			2,009,750		2,058,500		2,009,750
Options Exercisable, Weighted Average Exercise Price (in dollars per share)			$ 19.00		$ 19.00		$ 19.00
Non-qualified stock options | 2015 Management Incentive Plan
Share-based Compensation.
Vesting period	4 years
Expiration period	10 years
Unrecognized share-based compensation expense					$ 14,200
Weighted average period for compensation expense expected to be recognized			2 years
Restricted stock units
Share-based Compensation.
Expense recognized				$ 1,600
Unrecognized share-based compensation expense			$ 23,900	$ 28,500			$ 23,900
Weighted average period for compensation expense expected to be recognized			2 years 3 months 18 days	2 years 7 months 6 days
Activity
Outstanding (in shares)			1,573,441	984,466	984,466
Forfeited (in shares)			(95,481)	(115,869)
Outstanding (in shares)			1,477,960	868,597	1,573,441	984,466	1,477,960
Weighted Average Fair Value
Outstanding (in dollars per share)			$ 18.28	$ 22.32	$ 22.32
Forfeited (in dollars per share)			18.38	22.51
Outstanding (in dollars per share)			$ 18.28	$ 22.30	$ 18.28	$ 22.32	$ 18.28
Restricted stock units | 2015 Management Incentive Plan
Share-based Compensation.
Vesting period							4 years

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Additions made to capitalized computer software costs during the period.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-voting common interest units outstanding related to former Class A-2 profits, interests, Class B and East MIP Class B interests that were reclassified into non-voting common interest units.

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