Gfi (GFIG) 10-Q 12 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 30, 2014
Document and Entity Information	'	'
Entity Registrant Name	'GFI Group Inc.	'
Entity Central Index Key	'0001292426	'
Document Type	'10-Q	'
Document Period End Date	31-Mar-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	126,098,210
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Cash and cash equivalents	$149,044	$174,606
Cash and securities segregated under federal and other regulations	63,068	62,863
Accounts receivable, net of allowance for doubtful accounts of $1,931 and $1,958 at March 31, 2014 and December 31, 2013, respectively	109,154	87,502
Receivables from brokers, dealers and clearing organizations	851,781	295,727
Property, equipment and leasehold improvements, net of depreciation and amortization of $192,149 and $188,196 at March 31, 2014 and December 31, 2013, respectively	61,823	61,396
Goodwill	256,120	255,920
Intangible assets, net	43,431	45,684
Other assets	167,787	177,844
TOTAL ASSETS	1,702,208	1,161,542
LIABILITIES	'	'
Accrued compensation	65,947	77,841
Accounts payable and accrued expenses	45,221	37,409
Payables to brokers, dealers and clearing organizations	640,421	126,900
Payables to clearing services customers	199,974	177,523
Short-term borrowings	10,000	10,000
Long-term debt	240,000	240,000
Other liabilities	90,647	83,071
Total Liabilities	1,292,210	752,744
Commitments and contingencies (Note 10)	'	'
STOCKHOLDERS' EQUITY	'	'
Preferred stock, $0.01 par value; 5,000,000 shares authorized, none outstanding at March 31, 2014 and December 31, 2013	'	'
Common stock, $0.01 par value; 400,000,000 shares authorized; 143,047,788 and 140,599,626 shares issued at March 31, 2014 and December 31, 2013, respectively	1,431	1,405
Additional paid in capital	395,631	393,965
Retained earnings	80,995	83,180
Treasury stock, 17,261,480 and 17,312,957 shares of common stock at cost, at March 31, 2014 and December 31, 2013, respectively	-74,894	-75,018
Accumulated other comprehensive income	4,910	3,744
Total Stockholders' Equity	408,073	407,276
Non-controlling interests	1,925	1,522
Total Equity	409,998	408,798
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$1,702,208	$1,161,542

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED)	'	'
Accounts receivable, allowance for doubtful accounts	$1,931	$1,958
Property, equipment and leasehold improvements, depreciation and amortization	$192,149	$188,196
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	143,047,788	140,599,626
Treasury stock, common shares at cost	17,261,480	17,312,957

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenues	'	'
Agency commissions	$121,415	$126,572
Principal transactions	51,689	50,065
Total brokerage revenues	173,104	176,637
Clearing services revenues	34,164	38,064
Interest income from clearing services	528	737
Equity in net earnings of unconsolidated businesses	2,554	3,059
Software, analytics and market data	25,765	22,158
Other income, net	4,624	3,737
Total revenues	240,739	244,392
Interest and transaction-based expenses	'	'
Transaction fees on clearing services	32,640	36,908
Transaction fees on brokerage services	5,503	5,807
Interest expense from clearing services	169	160
Total interest and transaction-based expenses	38,312	42,875
Revenues, net of interest and transaction-based expenses	202,427	201,517
Expenses	'	'
Compensation and employee benefits	137,697	137,015
Communications and market data	13,347	13,587
Travel and promotion	7,779	8,061
Rent and occupancy	8,086	7,212
Depreciation and amortization	8,596	8,308
Professional fees	6,171	6,727
Interest on borrowings	7,784	7,688
Other expenses	7,464	12,824
Total other expenses	196,924	201,422
Income before provision for (benefit from) income taxes	5,503	95
Provision for (benefit from) income taxes	1,094	-4,859
Net income before attribution to non-controlling stockholders	4,409	4,954
Less: Net income attributable to non-controlling interests	406	280
GFI's net income	$4,003	$4,674
Earnings per share available to common stockholders	'	'
Basic (in dollars per share)	$0.03	$0.04
Diluted (in dollars per share)	$0.03	$0.04
Weighted average shares outstanding	'	'
Basic (in shares)	122,362,839	115,384,022
Diluted (in shares)	131,430,701	125,552,041
Dividends declared per share of common stock (in dollars per share)	$0.05	$0

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED)	'		'
Net income before attribution to non-controlling stockholders	$4,409		$4,954
Other comprehensive income (loss):	'		'
Foreign currency translation adjustment	2,241		-10,051
Unrealized (loss) gain on available-for-sale securities, net of tax(1)	-1,069	[1]	249	[1]
Total other comprehensive income (loss)	1,172		-9,802
Comprehensive income (loss) including non-controlling stockholders	5,581		-4,848
Comprehensive income attributable to non-controlling stockholders	412		152
GFI's comprehensive income (loss)	$5,169		($5,000)
[1]	Amounts are net of benefit from (provision for) income taxes of $341 and $(75) for the three months ended March 31, 2014 and 2013, respectively.

CONDENSED_CONSOLIDATED_STATEME4

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED)	'	'
Unrealized (loss) gain on available-for-sale securities, benefit from (provision for) income taxes	$341	($75)

CONDENSED_CONSOLIDATED_STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net income before attribution to non-controlling stockholders	$4,409	$4,954
Adjustments to reconcile net income to net cash (used in) provided by operating activities:	'	'
Depreciation and amortization	8,596	8,308
Share-based compensation	7,346	8,150
Tax expense related to share-based compensation	812	378
Amortization of prepaid bonuses and forgivable loans	6,720	6,348
Benefit from deferred taxes	-3,936	-7,826
(Gains) losses on foreign exchange derivative contracts, net	-202	79
Earnings from equity method investments, net	-663	-895
Amortization of deferred financing fees	454	809
Mark-to-market of future purchase commitment	'	-744
Impairment charges	611	'
Other non-cash charges, net	-382	-793
(Increase) decrease in operating assets:	'	'
Cash and securities segregated under federal and other regulations	-205	-10,558
Accounts receivable	-21,562	-18,810
Receivables from brokers, dealers and clearing organizations	-556,054	-102,828
Other assets	-6,268	21,585
Increase (decrease) in operating liabilities:	'	'
Accrued compensation	-11,894	1,489
Accounts payable and accrued expenses	7,812	2,693
Payables to brokers, dealers and clearing organizations	513,521	87,183
Payables to clearing services customers	22,451	-6,875
Other liabilities	7,449	8,177
Cash (used in) provided by operating activities	-20,985	824
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Proceeds from equity method investments	6,457	3,205
Proceeds from sales of available-for-sale investments	5,882	'
Purchases of equity method investments	-92	-21
Purchases of property, equipment and leasehold improvements	-2,628	-1,601
Capitalization of internally developed software	-2,752	-2,796
Proceeds on foreign exchange derivative contracts	271	1,019
Payments on foreign exchange derivative contracts	-338	-208
Other, net	257	'
Cash provided by (used in) investing activities	7,057	-402
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Proceeds from short-term borrowings	47,000	36,000
Repayment of short-term borrowings	-47,000	-26,000
Repurchase and retirement of a portion of long-term debt	'	-9,385
Cash dividends paid to common stockholders	-6,188	'
Shares withheld for taxes on vested restricted stock units	-5,174	-5,911
Tax expense related to share-based compensation	-812	-378
Other, net	456	-822
Cash used in financing activities	-11,718	-6,496
Effects of exchange rate changes on cash and cash equivalents	84	-5,223
DECREASE IN CASH AND CASH EQUIVALENTS	-25,562	-11,297
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	174,606	227,441
CASH AND CASH EQUIVALENTS, END OF PERIOD	149,044	216,144
SUPPLEMENTAL DISCLOSURE:	'	'
Cash paid for interest	13,635	12,009
Cash paid for income taxes	2,718	4,351
Cash received from income tax refunds	$675	$729

CONDENSED_CONSOLIDATED_STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) (USD $)	Total		Total Stockholders' Equity	Common Stock	Additional Paid In Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income	Non-Controlling Interests
In Thousands, unless otherwise specified
Balance at Dec. 31, 2013	$408,798		$407,276	$1,405	$393,965	($75,018)	$83,180	$3,744	$1,522
Increase (Decrease) in Stockholders' Equity	'		'	'	'	'	'	'	'
Issuance of treasury stock	'		'	'	-124	124	'	'	'
Issuance of common stock for exercise of stock options and vesting of restricted stock units	456		456	26	430	'	'	'	'
Withholding of restricted stock units in satisfaction of tax requirements	-5,174		-5,174	'	-5,174	'	'	'	'
Tax expense associated with share-based awards	-812		-812	'	-812	'	'	'	'
Foreign currency translation adjustment	2,241		2,235	'	'	'	'	2,235	6
Unrealized loss on available-for-sale securities, net of tax	-1,069	[1]	-1,069	'	'	'	'	-1,069	'
Dividends to stockholders	-6,188		-6,188	'	'	'	-6,188	'	'
Share-based compensation	7,346		7,346	'	7,346	'	'	'	'
Other capital adjustments	-9		'	'	'	'	'	'	-9
Net income	4,409		4,003	'	'	'	4,003	'	406
Balance at Mar. 31, 2014	$409,998		$408,073	$1,431	$395,631	($74,894)	$80,995	$4,910	$1,925
[1]	Amounts are net of benefit from (provision for) income taxes of $341 and $(75) for the three months ended March 31, 2014 and 2013, respectively.

ORGANIZATION_AND_BUSINESS

ORGANIZATION AND BUSINESS	3 Months Ended
	Mar. 31, 2014
ORGANIZATION AND BUSINESS	'
ORGANIZATION AND BUSINESS	'
	1.              ORGANIZATION AND BUSINESS
	The Condensed Consolidated Financial Statements include the accounts of GFI Group Inc. and its subsidiaries (collectively, “GFI” or the “Company”). The Company, through its subsidiaries, provides wholesale brokerage and trade execution services, clearing services and trading system software products to institutional clients in markets for a range of fixed income, financial, equity and commodity instruments. The Company complements its brokerage and trade execution capabilities with value-added services, such as market data and analytical software products for trader and back-office support, which it licenses primarily to companies in the financial services industry. As of March 31, 2014, Jersey Partners, Inc. (“JPI”) owned approximately 37% of the Company’s outstanding shares of common stock. The Company’s executive chairman, Michael Gooch, is the controlling shareholder of JPI.

SUMMARY_OF_SIGNIFICANT_ACCOUNT

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2014
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	2.              SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of Presentation— The Company’s Condensed Consolidated Financial Statements (Unaudited) are prepared in accordance with accounting principles generally accepted in the United States of America, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingencies in the Condensed Consolidated Financial Statements. Certain estimates and assumptions relate to the accounting for acquired goodwill and intangible assets, fair value measurements, compensation accruals, tax liabilities and the potential outcome of litigation matters. Management believes that the estimates utilized in the preparation of the Condensed Consolidated Financial Statements are reasonable and prudent. Actual results could differ materially from these estimates.
	Certain amounts in the Condensed Consolidated Statements of Cash Flows have been reclassified to conform to the current year presentation.
	These 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, 2013 (the “2013 Form 10-K”). The condensed consolidated financial information as of December 31, 2013 presented in this Form 10-Q has been derived from audited Consolidated Financial Statements not included herein.
	These unaudited Condensed Consolidated Financial Statements reflect all adjustments that are, in the opinion of management, necessary for a fair statement of the results for the interim periods presented. These adjustments are of a normal, recurring nature. Interim period operating results may not be indicative of the operating results for a full year.
	Consolidation Policies
	General— The Condensed Consolidated Financial Statements include the accounts of the Company, its wholly-owned subsidiaries and subsidiaries that are treated as such and other entities in which the Company has a controlling financial interest. For consolidated subsidiaries that are less than wholly-owned, equity interests that are not owned by the Company are referred to as non-controlling interests. The portion of net income attributable to non-controlling interests for such subsidiaries is presented as Net income attributable to non-controlling interests on the Condensed Consolidated Statements of Operations, and the portion of the stockholders’ equity of such subsidiaries is presented as Non-controlling interests in the Condensed Consolidated Statements of Financial Condition and Condensed Consolidated Statement of Changes in Stockholders’ Equity. All intercompany transactions and balances have been eliminated.
	Variable Interest Entities—The Company determines whether it holds any interests in entities deemed to be a variable interest entity (“VIE”). A 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 has a controlling financial interest and will consolidate a VIE if it is the primary beneficiary.
	The primary beneficiary is the party that has both (i) the power to direct the activities of the VIE that most significantly impact the economic performance of the entity and (ii) the obligation to absorb losses of the entity that could be potentially significant to the VIE or the right to receive benefits from the entity that could be potentially significant.
	As of March 31, 2014, the company holds interests in certain VIEs. One of these VIEs is consolidated because it was determined that the Company is the primary beneficiary of this VIE because (1) the Company provided the majority of the VIE’s start-up capital and (2) the Company has consent rights regarding those activities that the Company believes would most significantly impact the economic performance of the entity. The remaining VIEs are not consolidated as it was determined that the Company is not the primary beneficiary due to the level of equity ownership and voting power.  The Company reassesses its evaluation of whether an entity is a VIE when certain events occur, such as changes in economic ownership and voting power.  The Company reassesses its determination of whether it is the primary beneficiary of a VIE on an ongoing basis based on current facts and circumstances.  See Note 14 for disclosures on Variable Interest Entities.
	Cash and Cash Equivalents— Cash and cash equivalents consist of cash and highly liquid investments purchased with an original maturity of three months or less.
	Cash and Securities Segregated Under Federal and Other Regulations—The Company holds cash and securities representing funds received in connection with customer trading activities. The Company’s subsidiaries are required to satisfy regulations mandated by their primary regulators to segregate or set aside cash or equivalent securities to satisfy regulations, promulgated to protect customer assets.
	Accounts Receivable —Accounts receivable largely represents commissions due from brokers, dealers, banks and other financial and nonfinancial institutions for the execution of securities, commodities, foreign exchange and other derivative brokerage transactions. Also, included within Accounts receivable are the billed portion of existing contracts from customers related to the licensing, support and maintenance of software, analytics and market data, as well as any unbilled but earned portion of any services provided to such customers. In estimating the allowance for doubtful accounts, management considers the length of time receivables are past due and historical experience. In addition, if the Company is aware of a client’s inability to meet its financial obligations, a specific provision for doubtful accounts is recorded in the amount of the estimated losses that will result from the inability of that client to meet its financial obligation.
	Receivables from and Payables to Brokers, Dealers and Clearing Organizations—Receivables from and payables to brokers, dealers and clearing organizations primarily represent: (i) principal transactions for which the stated settlement dates have not yet been reached, (ii) principal transactions which have not settled as of their stated settlement dates, (iii) cash, including deposits, held at clearing organizations and exchanges in support of the Company’s clearing business and to facilitate settlement and clearance of matched principal transactions and (iv) the spread on matched principal transactions that have not yet been remitted from/to clearing organizations and exchanges.
	Property, Equipment and Leasehold Improvements—Property, equipment and leasehold improvements are stated at cost, less accumulated depreciation and amortization. Depreciation and amortization are calculated using the straight-line method, generally over three to seven years. Property and equipment are depreciated over their estimated useful lives. Leasehold improvements are amortized over the shorter of the remaining term of the respective lease to which they relate or the remaining useful life of the leasehold improvement. Internal and external costs incurred in developing or obtaining computer software for internal use are capitalized in accordance with Accounting Standards Codification (“ASC”) 350 Intangibles—Goodwill and Other (“ASC 350”), and are amortized on a straight-line basis over the estimated useful life of the software, generally three years. General and administrative costs related to developing or obtaining such software are expensed as incurred.
	Goodwill and Intangible Assets—Goodwill represents the excess of the purchase price allocation over the fair value of tangible and identifiable intangible net assets acquired. The goodwill associated with each business combination is allocated to the related reporting units, which are determined based on how the Company’s businesses are managed and how they are reviewed by the Company’s chief operating decision maker. Other intangible assets are recorded at their fair value upon completion of a business combination or certain other transactions. Substantially all of the firm’s identifiable intangible assets are considered to have definite lives and are amortized on a straight-line basis over their estimated useful lives.
	In accordance with ASC 350, goodwill is not amortized, but instead is periodically tested for impairment. The Company reviews goodwill for impairment on an annual basis as of November 1 of each fiscal year or whenever an event occurs or circumstances change that could reduce the fair value of a reporting unit below its carrying amount. See Note 4 for further information.
	Prepaid Bonuses and Forgivable Employee Loans—Prepaid bonuses and forgivable loans to employees are stated at historical value net of amortization when the agreement between the Company and the employee provides for the return of proportionate amounts of the bonus or loan outstanding if employment is terminated in certain circumstances prior to the end of  the term of the agreement. Amortization is calculated using the straight-line method over the term of the contract, which is generally two to four years, and is recorded in Compensation and employee benefits. The Company generally expects to recover the unamortized portion of prepaid bonuses and forgivable loans when employees voluntarily terminate their employment or if their employment is terminated for cause prior to the end of the term of the agreement. The prepaid bonuses and forgivable loans are included in Other assets in the Condensed Consolidated Statements of Financial Condition. At March 31, 2014 and December 31, 2013, the Company had prepaid bonuses of $22,699 and $23,499, respectively. At March 31, 2014 and December 31, 2013, the Company had forgivable employee loans and advances to employees of $22,448 and $24,109, respectively. Amortization of prepaid bonuses and forgivable employee loans for the three months ended March 31, 2014 and 2013 was $6,720 and $6,348, respectively and is included within Compensation and employee benefits.
	Investments—When the Company does not have a controlling financial interest in an entity but can exert significant influence over the entity’s operating and financial policies, the investment is accounted for under the equity method of accounting in accordance with ASC 323-10, Investments—Equity Method and Joint Ventures (“ASC 323-10”). Significant influence generally exists when the Company owns 20% to 50% of the entity’s common stock or in-substance common stock. The Company initially records the investment at cost and adjusts the carrying amount each period to recognize its share of the earnings and losses of the investee based on the percentage of ownership. At March 31, 2014 and December 31, 2013, the Company had equity method investments with a carrying value of $31,358 and $36,976, respectively, included within Other assets. The Company also provides clearing and other administrative services to certain of these equity method investees.
	Investments for which the Company does not have the ability to exert significant influence over operating and financial policies are generally accounted for using the cost method of accounting in accordance with ASC 325-10, Investments—Other (“ASC 325-10”). At March 31, 2014 and December 31, 2013, the Company had cost method investments of $4,614 and $5,087, respectively, included within Other assets.  The fair value of the Company’s cost method investments are not estimated if there are no identified events or changes in circumstances that may have a significant adverse effect on the fair value. The Company monitors its equity and cost method investments for indicators of impairment each reporting period.
	The Company accounts for its marketable equity securities and its debt securities in accordance with ASC 320-10, Investments—Debt and Equity Securities (“ASC 323-10”). Investments that are owned by the Company’s broker-dealer subsidiaries are recorded at fair value with realized and unrealized gains and losses reported in net income. Investments designated as available-for-sale that are owned by the Company’s non broker-dealer subsidiaries are recorded at fair value with unrealized gains or losses reported as a separate component of other comprehensive income (loss), net of tax.  The fair value of the Company’s available-for-sale securities was $0 and $5,465 as of March 31, 2014 and December 31, 2013, respectively, and is included within Other assets.
	Fair Value of Financial Instruments—In accordance with ASC 820-10, Fair Value Measurements and Disclosures (“ASC 820-10”), the Company estimates fair values of financial instruments using relevant market information and other assumptions. Fair value estimates involve uncertainties and matters of significant judgment in interpreting market data and, accordingly, changes in assumptions or in market conditions could adversely affect the estimates. The Company also discloses the fair value of its financial instruments in accordance with the fair value hierarchy as set forth by ASC 820-10. See Note 12 for further information.
	Derivative Financial Instruments—The Company enters into derivative transactions for a variety of reasons, including managing its exposure to risk arising from changes in foreign currency, facilitating customer trading activities and, in certain instances, to engage in principal trading for the Company’s own account. Derivative assets and liabilities are carried on the Condensed Consolidated Statements of Financial Condition at fair value, with changes in the fair value recognized in the Condensed Consolidated Statements of Operations. Contracts entered into to manage risk arising from changes in foreign currency are recognized in Other income and contracts entered into to facilitate customer transactions and principal trading are recognized in Principal transactions. Derivatives are reported on a net-by-counterparty basis when management believes that a legal and enforceable right of offset exists under these agreements. See Note 13 for further information.
	Payables to Clearing Services Customers—Payables to clearing services customers include amounts due on cash and margin transactions, including futures contracts transacted on behalf of customers.
	Revenue Recognition
	Brokerage Transactions—The Company provides brokerage services to its clients in the form of either agency or principal transactions. In agency transactions, the Company charges commissions for executing transactions between buyers and sellers. Agency commission revenues and related expenses are recognized on a trade date basis. These revenues are presented in “Agency Commissions”.  Principal transactions revenue is primarily derived from matched principal and principal trading transactions. Principal transactions revenues and related expenses are recognized on a trade date basis. The Company earns revenue from principal transactions on the spread between the buy and sell price of the security that is brokered. In matched principal transactions, the Company simultaneously agrees to buy instruments from one customer and sell them to another customer. These revenues are presented in “Principal Transactions”.  In the normal course of its matched principal and principal trading businesses, the Company may hold security positions overnight. These positions are marked to market on a daily basis.
	Clearing Services Revenues—The Company charges fees to customers for clearing services provided for cash and derivative transactions. Clearing services revenues are recorded on a trade date basis as customer transactions occur and are presented net of any customer negotiated rebates.
	Software, Analytics and Market Data Revenue Recognition— Software revenue consists primarily of fees charged for Trayport electronic trading software, which are typically billed on a subscription basis and are recognized ratably over the term of the subscription period, which ranges from one to five years. Analytics revenue consists primarily of software license fees for Fenics pricing tools which are typically billed on a subscription basis, and is recognized ratably over the term of the subscription period, which is generally three years. Market data revenue primarily consists of subscription fees and fees from customized one-time sales. Market data subscription fees are recognized on a straight-line basis over the term of the subscription period, which ranges from one to two years. Market data revenue from customized one-time sales is recognized upon delivery of the data. The Company markets its software, analytics and market data products through its direct sales force and, in some cases, indirectly through resellers. In general, the Company’s license agreements for such products do not provide for a right of return.
	Other Income, net—Included within Other income, net on the Company’s Condensed Consolidated Statements of Operations are revaluations of foreign currency derivative contracts, realized and unrealized transaction gains and losses on certain foreign currency denominated items, and gains and losses on certain investments, and interest income earned on short-term investments.
	Compensation and Employee Benefits—The Company’s compensation and employee benefits have both a fixed and variable component. Base salaries and benefit costs are primarily fixed for all employees while bonuses constitute the variable portion of compensation and employee benefits. The Company may pay certain performance bonuses in restricted stock units (“RSUs”). The Company also may grant sign-on and retention bonuses for certain newly-hired or existing employees who agree to long-term employment agreements.
	Share-Based Compensation—The Company’s share-based compensation consists of RSUs. The Company accounts for share-based compensation in accordance with ASC 718 Compensation— Stock Compensation (“ASC 718”). This accounting guidance requires measurement of compensation expense for equity-based awards at fair value and recognition of compensation expense over the service period, net of estimated forfeitures. In all periods presented, the only share-based compensation expense recognized by the Company has been RSUs. The Company determines the fair value of RSUs based on the number of units granted and the grant date fair value of the Company’s common stock, measured as of the closing price on the date of grant. See Note 9 for further information.
	Income Taxes— In accordance with ASC 740, Income Taxes (“ASC 740”), the Company provides for income taxes using the asset and liability method under which deferred income taxes are recognized for the estimated future tax effects attributable to temporary differences and carryforwards that result from events that have been recognized either in the financial statements or the income tax returns, but not both. The measurement of current and deferred income tax assets and liabilities is based on provisions of enacted tax laws. Valuation allowances are recognized if, based on the weight of available evidence, it is more likely than not that some portion of the deferred tax assets will not be realized. Management applies the more likely than not criteria prior to recognizing a financial statement benefit for a tax position taken (or expected to be taken) in a tax return. The Company recognizes interest and/or penalties related to income tax matters in interest expense and other expense, respectively.
	For the three months ended March 31, 2014 the Company recorded income tax expense of $1.1 million.  The expense yields an effective rate lower than the federal statutory rate of 35% due to the geographical mix of pre-tax income.
	For the three months ended March 31, 2013 the Company recorded a benefit from income taxes of $4.9 million. The benefit was primarily due to: (i) a tax benefit under the American Taxpayer Relief Act of 2012 related to taxes previously provided for, (ii) a tax benefit arising from a change in our view about the deductibility of a reserve previously deemed nondeductible, as a result of new information received in the first quarter of 2013 and (iii) the release of a tax liability in a foreign subsidiary where the statute of limitations has now expired.
	Treasury Stock—The Company accounts for Treasury stock using the cost method. Treasury stock held by the Company may be reissued with respect to vested RSUs in qualified jurisdictions. The Company’s policy is to account for these shares as a reduction of Treasury stock on a first-in, first-out basis.
	Foreign Currency Translation Adjustments and Transactions— Assets and liabilities of foreign subsidiaries having non-U.S. dollar functional currencies are translated at the period end rates of exchange, and revenue and expenses are translated at the average rates of exchange for the period. Gains or losses resulting from translating foreign currency financial statements are reflected in foreign currency translation adjustments and are reported as a separate component of comprehensive income (loss) and included in accumulated other comprehensive income in the Condensed Consolidated Statement of Changes in Stockholders’ Equity. Net losses resulting from remeasurement of foreign currency transactions and balances were $92 and $273 for the three months ended March 31, 2014 and 2013, respectively, and are included in Other income, net in the Condensed Consolidated Statements of Operations.
	Recent Accounting Pronouncements—In March 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-05, “Foreign Currency Matters” (“ASU 2013-05”), which clarifies the accounting for the cumulative translation adjustment when a parent either sells or transfers a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a foreign subsidiary or group of assets. ASU 2013-05 provides that the parent should release cumulative translation adjustment into net income only if the sale or transfer results in the complete or substantially complete liquidation of the foreign entity in which the subsidiary or group of assets had resided. This guidance was effective for the Company’s fiscal year beginning January 1, 2014, and is being applied prospectively.  The adoption of ASU 2013-05 does not have a material impact on the Company’s condensed consolidated financial statements.
	In July 2013, the FASB issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or tax credit carryforward, unless such tax loss or credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes resulting from the disallowance of a tax position. In the event that the tax position is disallowed or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit shall be presented in the financial statements as a liability and shall not be combined with deferred tax assets. The guidance was effective for the Company’s fiscal year beginning January 1, 2014, and is being applied prospectively. The adoption of ASU 2013-11 does not have a material impact on the Company’s condensed consolidated financial statements.

RECEIVABLES_FROM_AND_PAYABLES_

RECEIVABLES FROM AND PAYABLES TO BROKERS, DEALERS AND CLEARING ORGANIZATIONS	3 Months Ended
	Mar. 31, 2014
RECEIVABLES FROM AND PAYABLES TO BROKERS, DEALERS AND CLEARING ORGANIZATIONS	'
RECEIVABLES FROM AND PAYABLES TO BROKERS, DEALERS AND CLEARING ORGANIZATIONS	'
	3.              RECEIVABLES FROM AND PAYABLES TO BROKERS, DEALERS AND CLEARING ORGANIZATIONS
	Amounts receivable from and payable to brokers, dealers and clearing organizations consisted of the following:
		March 31,		December 31,
		2014		2013
	Receivables from brokers, dealers and clearing organizations:
	Contract value of fails to deliver	$	635,431	$	123,470
	Receivables from and deposits with clearing organizations and financial institutions	216,350		172,257
	Total	$	851,781	$	295,727
	Payables to brokers, dealers and clearing organizations:
	Contract value of fails to receive	$	614,194	$	123,393
	Payables to clearing organizations and financial institutions	21,963		3,052
	Net pending trades	4,264		455
	Total	$	640,421	$	126,900
	Substantially all fail to deliver and fail to receive balances as of March 31, 2014 and December 31, 2013 have subsequently settled at the contracted amounts.
	In addition to the balances above, the Company had Payables to clearing services customers of $199,974 and $177,523 at March 31, 2014 and December 31, 2013, respectively. These amounts represent cash payable to the Company’s clearing customers that is held at the Company’s third-party general clearing members and are included within Cash and securities segregated under federal and other regulations or Receivables from brokers, dealers and clearing organizations as follows:
		March 31,		December 31,
		2014		2013
	Cash segregated under federal and other regulations	62,895		62,684
	Receivables from brokers, dealers, and clearing organizations	137,079		114,839
	Total	$	199,974	$	177,523

GOODWILL_AND_INTANGIBLE_ASSETS

GOODWILL AND INTANGIBLE ASSETS	3 Months Ended
	Mar. 31, 2014
GOODWILL AND INTANGIBLE ASSETS	'
GOODWILL AND INTANGIBLE ASSETS	'
	4.              GOODWILL AND INTANGIBLE ASSETS
	Goodwill—Changes in the carrying amount of the Company’s goodwill for the three months ended March 31, 2014 were as follows:
		December 31,		Goodwill		Adjustments			Foreign currency		March 31,
		2013		acquired					translation		2014
	Goodwill
	Americas Brokerage	$	83,289	$	—	$	—		$	—	$	83,289
	EMEA Brokerage	14,637		—		—			83		14,720
	Clearing and Backed Trading	23,259		—		—			150		23,409
	All Other	134,735		—		(60		)	27		134,702
		$	255,920	$	—	$	(60	)	$	260	$	256,120
	Goodwill is required to be tested for impairment at least annually and more frequently when indicators of impairment exist. All of the Company’s goodwill is allocated to its reporting units and the goodwill impairment tests are performed at the reporting unit level. The Company determined its reporting units to be Americas Brokerage; Europe, Middle East and Africa (“EMEA”) Brokerage; Asia Brokerage; Clearing and Backed Trading; Trayport; and Fenics. No events or changes in circumstances which would indicate goodwill impairment occurred in the three months ended March 31, 2014.
	Intangible Assets—Intangible assets consisted of the following:
		March 31, 2014							December 31, 2013
		Gross		Accumulated		Net			Gross		Accumulated		Net
		amount		amortization		carrying			amount		amortization		carrying
				and foreign		value					and foreign		value
				currency							currency
				translation							translation
	Amortized intangible assets:
	Customer relationships	$	77,196	$	44,000	$	33,196		$	77,196	$	42,151	$	35,045
	Trade names	8,951		6,797		2,154			8,951		6,674		2,277
	Core technology	11,950		6,411		5,539			11,950		6,285		5,665
	Non-compete agreements	3,865		3,491		374			3,865		3,478		387
	Favorable lease agreements	620		600		20			620		580		40
	Patents	3,131		1,346		1,785			3,131		1,221		1,910
	Other	647		284		363			647		287		360
	Total	$	106,360	$	62,929	$	43,431		$	106,360	$	60,676	$	45,684
	Intangible amortization expense for three months ended March 31, 2014 and 2013 was $2,469 and $2,498, respectively.
	At March 31, 2014, expected amortization expense for the definite lived intangible assets is as follows:
	2014 (remaining nine months)	$	7,277
	2015	9,609
	2016	7,693
	2017	4,333
	2018	3,510
	Thereafter	11,009
	Total	$	43,431

OTHER_ASSETS_AND_OTHER_LIABILI

OTHER ASSETS AND OTHER LIABILITIES	3 Months Ended
	Mar. 31, 2014
OTHER ASSETS AND OTHER LIABILITIES	'
OTHER ASSETS AND OTHER LIABILITIES	'
	5.              OTHER ASSETS AND OTHER LIABILITIES
	Other assets consisted of the following:
		March 31,		December 31,
		2014		2013
	Deferred tax assets	$	48,779	$	45,694
	Investments accounted for under the cost method and equity method	35,972		42,063
	Prepaid bonuses	22,699		23,499
	Forgivable employee loans and advances to employees	22,448		24,109
	Deferred financing fees	6,332		6,786
	Software inventory, net	4,422		4,749
	Financial instruments owned	951		1,416
	Other	26,184		29,528
	Total Other assets	$	167,787	$	177,844
	Other liabilities consisted of the following:
		March 31,		December 31,
		2014		2013
	Payroll related liabilities	$	31,007	$	15,896
	Deferred revenues	10,483		9,199
	Unrecognized tax benefits	8,676		8,676
	Deferred tax liabilities	6,440		6,835
	Contingent consideration liabilities	4,372		4,317
	Financial instruments sold, not yet purchased	675		993
	Other	28,994		37,155
	Total Other liabilities	$	90,647	$	83,071

SHORTTERM_BORROWINGS_AND_LONGT

SHORT-TERM BORROWINGS AND LONG-TERM DEBT	3 Months Ended
	Mar. 31, 2014
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'
	6.              SHORT-TERM BORROWINGS AND LONG-TERM DEBT
	The Company’s outstanding debt obligations consisted of the following:
		March 31,		December 31,
		2014		2013
	8.375% Senior Notes due 2018	$	240,000	$	240,000
	Loans pursuant to Credit Agreement	10,000		10,000
	Total	$	250,000	$	250,000
	The Company’s debt obligations are carried at historical amounts. The fair value of the Company’s Long-term debt obligations, categorized within Level 2 of the fair value hierarchy, is measured primarily using pricing service data from external providers.  The carrying amounts and estimated fair values of the Company’s Long-term debt obligations are as follows:
		March 31, 2014				December 31, 2013
		Carrying		Fair Value		Carrying		Fair Value
		Amount				Amount
	8.375% Senior Notes	$	240,000	$	257,400	$	240,000	$	251,100
	8.375% Senior Notes
	In July 2011, the Company issued $250,000 in aggregate principal amount of 8.375% Senior Notes (the “8.375% Senior Notes”) due 2018 in a private offering (the “Offering”) to qualified institutional buyers pursuant to Rule 144A and to certain persons in offshore transactions pursuant to Regulation S, each under the Securities Act of 1933, as amended (the “Securities Act”).  The notes were priced to investors at 100% of their principal amount, and mature in July 2018. Interest on these notes is payable, semi-annually in arrears on the 19th of January and July. Transaction costs of approximately $9,100 related to the 8.375% Senior Notes were deferred and are being amortized over the term of the notes.  On December 21, 2011, the Company completed an exchange offer for the 8.375% Senior Notes whereby it exchanged $250,000 in aggregate principal amount of the 8.375% Senior Notes for 8.375% Senior Notes that are registered under the Securities Act.
	In March 2013, the Company repurchased $10,000 principal amount of its 8.375% Senior Notes on the open market for an aggregate purchase price of $9,602, including accrued interest and sales commissions. The Company funded the repurchase of these notes with borrowings under its Credit Agreement.
	On January 18, 2013, Moody’s Investor Services lowered its credit rating on the Company’s 8.375% Senior Notes two notches to B1, which increased the Company’s applicable per annum interest, effective January 19, 2013, by an additional 50 basis points. On April 19, 2013, Fitch Ratings, Inc. (“Fitch”) further lowered its credit rating on the Company’s 8.375% Senior Notes two notches to BB and revised its outlook from Stable to Negative. This credit rating downgrade by Fitch increased our applicable per annum interest by an additional 50 basis points, effective July 19, 2013. On June 26, 2013, Standard & Poor’s (“S&P”) further lowered its credit rating on the Company’s 8.375% Senior Notes one notch to B+ and revised its outlook from Negative to Stable. This credit rating downgrade by S&P increased the Company’s applicable per annum interest by an additional 25 basis points, effective July 19, 2013.
	The cumulative effect of all such downgrades to the Company’s credit rating by the various rating agencies subsequent to the issuance of our 8.375% Senior Notes resulted in 200 basis points penalty interest, which is the maximum increase permitted under the indenture. The additional 200 basis points of interest equates to $4,800 in additional interest expense per annum, based on the aggregate amount of outstanding principal as of March 31, 2014.
	At March 31, 2014 and December 31, 2013, unamortized deferred financing fees related to the 8.375% Senior Notes of $5,357 and $5,669, respectively, were recorded within Other assets and the Company was in compliance with all applicable covenants.
	Credit Agreement
	In March 2013, the Company entered into an amendment to its second amended and restated credit agreement (as amended, the “Credit Agreement”) with Bank of America, N.A. and certain other lenders. The Credit Agreement provided for maximum revolving loans of up to $75,000 until December 2013, at which time $18,750 of the lender commitments were due to mature and the remaining $56,250 of lender commitments were due to mature in December 2015.
	On December 9, 2013, the various lenders under the Credit Agreement executed an assignment and assumption agreement pursuant to which the extending lenders under the Credit Agreement assumed the lender commitments of the non-extending lender and the Company consented to the assignment.  As a result, the borrowing capacity will remain at $75,000 until the Credit Agreement matures in December 2015. The Credit Agreement provides for up to $50,000 for letters of credit.
	Revolving loans may be either base rate loans or Eurocurrency rate loans. Eurocurrency rate loans bear interest at the annualized rate of one-month LIBOR plus the application margin and base rate loans bear interest at a rate per annum equal to a prime rate plus the applicable margin. Letter of credit fees per annum are equal to the applicable margin times the outstanding amount drawn under such letter of credit. As long as no default has occurred under the Credit Agreement, the applicable margin for base rate and Eurocurrency rate loans and letters of credit is based on a matrix that varies with a ratio of outstanding debt to EBITDA, as defined in the Credit Agreement.
	The weighted average interest rate of the outstanding loans under the Credit Agreement was 3.41% at March 31, 2014. At March 31, 2014 and December 31, 2013, unamortized deferred financing fees related to the Credit Agreement of $975 and $1,117, respectively, were recorded within Other assets.
	The Credit Agreement contains certain financial and other covenants. The Company was in compliance with all applicable covenants at March 31, 2014 and December 31, 2013.

STOCKHOLDERS_EQUITY

STOCKHOLDERS' EQUITY	3 Months Ended
	Mar. 31, 2014
STOCKHOLDERS' EQUITY	'
STOCKHOLDERS' EQUITY	'
	7.              STOCKHOLDERS’ EQUITY
	In August 2007, the Company’s Board of Directors authorized the Company to implement a stock repurchase program to repurchase a limited number of shares of the Company’s common stock. Under the repurchase plan, the Board of Directors authorized the Company to repurchase shares of the Company’s common stock on the open market in such amounts as determined by the Company’s management, provided, however, such amounts are not to exceed, during any calendar year, the number of shares issued upon the exercise of stock options plus the number of shares underlying grants of RSUs that are granted or which management reasonably anticipates will be granted in such calendar year. During the three months ended March 31, 2014, and March 31, 2013 the Company did not repurchase any shares of its common stock.
	On March 28, 2014 the Company paid a cash dividend of $0.05 per share, which, based on the number of shares outstanding on the record date for such dividends, totaled $6,188.  In December 2012, the Company’s Board of Directors declared a dividend for the fourth quarter of 2012 on an accelerated basis. The dividend was declared and paid in December 2012 and the Company, therefore, did not pay a cash dividend during the first quarter of 2013.

EARNINGS_PER_SHARE

EARNINGS PER SHARE	3 Months Ended
	Mar. 31, 2014
EARNINGS PER SHARE	'
EARNINGS PER SHARE	'
	8.              EARNINGS PER SHARE
	Basic earnings per share for common stock is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding during the period. Diluted earnings per share is calculated by dividing net income by the sum of: (i) the weighted average number of shares outstanding, (ii) outstanding stock options and RSUs (using the “treasury stock” method when the impact of such options and RSUs would be dilutive), and (iii) any contingently issuable shares when dilutive.
	Basic and diluted earnings per share for the three months ended March 31, 2014 and 2013 were as follows:
		Three Months Ended March 31,
		2014			2013
	Basic earnings per share
	GFI’s net income	$	4,003		$	4,674
	Weighted average common shares outstanding	122,362,839			115,384,022
	Basic earnings per share	$	0.03		$	0.04
	Diluted earnings per share
	GFI’s net income	$	4,003		$	4,674
	Weighted average common shares outstanding	122,362,839			115,384,022
	Effect of dilutive options, RSUs, and other contingently issuable shares	9,067,862			10,168,019
	Weighted average shares outstanding and common stock equivalents	131,430,701			125,552,041
	Diluted earnings per share	$	0.03		$	0.04
	Excluded from the computation of diluted earnings per share because their effect would be anti-dilutive were the following:
		Three Months Ended March 31,
		2014		2013
	Stock options	16,844		69,476
	RSUs	286,014		6,135,867
	Included in the computation of diluted earnings per share, but not in the computation of basic earnings per share as the conditions for issuance were not satisfied as of the respective reporting period were 1,171,879 and 3,682,916 contingently issuable shares for the three months ended March 31, 2014 and 2013, respectively.

SHAREBASED_COMPENSATION

SHARE-BASED COMPENSATION	3 Months Ended
	Mar. 31, 2014
SHARE-BASED COMPENSATION	'
SHARE-BASED COMPENSATION	'
	9.              SHARE-BASED COMPENSATION
	The Company’s Amended and Restated GFI Group Inc. 2008 Equity Incentive Plan, which was approved by the Company’s stockholders on June 6, 2013 (as amended and restated, the “2008 Equity Incentive Plan”) permits the grant of non-qualified stock options, incentive stock options, stock appreciation rights, shares of restricted stock, restricted stock units and performance units to employees, non-employee directors or consultants. The Company issues shares from authorized but unissued shares and authorized and issued shares reacquired and held as treasury shares, which are reserved for issuance upon the vesting of RSUs granted pursuant to the 2008 Equity Incentive Plan.  As of March 31, 2014, there were 7,272,045 shares of common stock available for future grants of awards under the 2008 Equity Incentive Plan.
	As of March 31, 2014, the Company had stock options outstanding under the GFI Group 2002 Stock Option Plan (the “GFI Group 2002 Plan”). No additional grants will be made under this option plan.
	Restricted Stock Units
	The fair value of RSUs is based on the closing price of the Company’s common stock on the date of grant and is recorded as compensation expense over the service period, net of estimated forfeitures. The following is a summary of RSU transactions under both the 2008 Equity Incentive Plan and the 2004 Equity Incentive Plan:
		RSUs		Weighted-
				Average
				Grant Date
				Fair Value
	Outstanding December 31, 2013	18,483,001		$	4.01
	Granted	2,908,418		3.56
	Vested	(3,908,980	)	4.11
	Cancelled	(224,874	)	3.62
	Outstanding March 31, 2014	17,257,565		$	3.92
	The weighted average grant-date fair value of RSUs granted for the three months ended March 31, 2014 was $3.56 per unit, compared with $3.35 per unit for the same period in the prior year. Total compensation expense and related income tax benefits recognized in relation to RSUs are as follows:
		Three Months Ended March 31,
		2014			2013
	Compensation expense	$	7,356		$	8,142
	Income tax benefits	$	2,099		$	2,488
	At March 31, 2014, total unrecognized compensation cost related to the RSUs prior to the consideration of expected forfeitures was approximately $51,663 and is expected to be recognized over a weighted-average period of 1.79 years. The total fair value of RSUs vested during the three months ended March 31, 2014 and 2013 was $16,057 and $20,472, respectively.
	Stock Options
	The following is a summary of stock options outstanding under the GFI Group 2002 Plan as of March 31, 2014:
		Options		Weighted
				Average
				Exercise
				Price
	Outstanding December 31, 2013	139,164		$	4.16
	Exercised	(20,212	)	2.97
	Cancelled	—		—
	Expired	(94,740	)	4.24
	Outstanding March 31, 2014	24,212		$	4.56
	As of March 31, 2014 and 2013, there was no unrecognized compensation cost related to stock options.

COMMITMENTS_AND_CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2014
COMMITMENTS AND CONTINGENCIES	'
COMMITMENTS AND CONTINGENCIES	'
	10.                 COMMITMENTS AND CONTINGENCIES
	Purchase Obligations— The Company has various unconditional purchase obligations. These obligations are for the purchase of market data from a number of information service providers during the normal course of business. As of March 31, 2014, the Company had total purchase commitments for market data of approximately $26,603, with $18,807 due within the next twelve months and $7,796 due between one to three years. Additionally, the Company had $8,515 of other purchase commitments including $7,500 primarily related to network upgrades in the U.S. and U.K., and $1,015 for hosting and software license agreements. Of these other purchase commitments, approximately $4,493 is due within the next twelve months.
	Contingencies—In the normal course of business, the Company and certain subsidiaries included in the condensed consolidated financial statements are, and have been in the past, involved  in various lawsuits and proceedings and are, and have been in the past, involved in certain regulatory examinations. These legal proceedings are at varying stages of adjudication, arbitration or investigation and involve a wide variety of claims. In view of the inherent difficulty of predicting the outcome of such litigation and regulatory matters, particularly where the claimants seek very large or indeterminate damages or where the matters present novel legal theories, the Company generally cannot predict what the eventual outcome of the pending matters will be, what the timing of the ultimate resolution of these matters will be, or what the eventual loss, fines or penalties, if any, relating to each matter may be.
	The Company is subject to the possibility of losses from these various contingencies. Considerable judgment is necessary to estimate the probability and amount of any loss from such contingencies. In accordance with applicable accounting guidelines, an accrual is made when it is probable that a liability has been incurred or an asset has been impaired and the amount of loss can be reasonably estimated.  Where a loss contingency is not both probable and estimable, the Company does not establish an accrued liability.
	The Company is subject to regular examinations by various tax authorities in jurisdictions in which the Company has significant business operations. The Company regularly assesses the likelihood of additional tax assessments that may result from these examinations in each of the tax jurisdictions. A tax accrual has been established, which the Company believes to be adequate in relation to the potential for additional tax assessments. Once established, the accrual may be adjusted based on new information or events. The imposition of additional tax assessments, penalties or fines by a tax authority could have a material impact on the Company’s effective tax rate.
	Additionally, the Company has recorded reserves for certain contingencies to which it may have exposure, such as contingencies related to the employer portion of National Insurance Contributions in the U.K.
	Based on currently available information, the outcome of the Company’s outstanding legal proceedings are not expected to have a material adverse impact on the Company’s financial position. However, the outcome of any such matters may be material to the Company’s results of operations or cash flows in a given period. It is not presently possible to determine the Company’s ultimate exposure to these matters and there is no assurance that the resolution of the Company’s outstanding matters will not significantly exceed any reserves accrued by the Company.
	The purchase price paid in connection with the acquisition of Contigo Limited, included contingent consideration with an estimated net present value, at the time of the acquisition, of £2,458 (or approximately $3,942). Subsequent changes in the estimated fair value of the contingent consideration, which is to be settled in 2015, will be recorded in Other income, net in the Condensed Consolidated Statements of Operations and the estimated fair value of the contingent consideration as of March 31, 2013 is included within Other liabilities in the Condensed Consolidated Statements of Financial Condition. See Note 12 for further information.
	Risks and Uncertainties— The Company primarily generates its revenues by executing and facilitating transactions for counterparties. Revenues for these services are transaction based. As a result, the Company’s revenues will likely vary based upon the trading volumes of the various securities, commodities, foreign exchange and other cash and derivative markets in which the Company provides its services.
	Guarantees— The Company, through its subsidiaries, is a member of certain exchanges and clearing houses. Under the membership agreements, members are generally required to guarantee certain obligations. To mitigate the performance risks of its members, the exchanges and clearing houses may, from time to time, require members to post collateral, as well as meet certain minimum financial standards. The Company’s maximum potential liability under these arrangements cannot be quantified. However, management believes that the potential for the Company to be required to make payments under these arrangements is unlikely. Accordingly, no contingent liability is recorded in the Condensed Consolidated Statements of Financial Condition for these arrangements.

MARKET_AND_CREDIT_RISKS

MARKET AND CREDIT RISKS	3 Months Ended
	Mar. 31, 2014
MARKET AND CREDIT RISKS	'
MARKET AND CREDIT RISKS	'
	11.                 MARKET AND CREDIT RISKS
	Disclosure regarding the Company’s financial instruments with market and credit risks are described in “Note 15—Market and Credit Risks” of the Notes to the Consolidated Financial Statements contained in the Company’s 2013 Form 10-K. There have been no material changes to these risks during the three months ended March 31, 2014.

FAIR_VALUE_OF_FINANCIAL_INSTRU

FAIR VALUE OF FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2014
FAIR VALUE OF FINANCIAL INSTRUMENTS	'
FAIR VALUE OF FINANCIAL INSTRUMENTS	'
	12.                 FAIR VALUE OF FINANCIAL INSTRUMENTS
	Certain of the Company’s financial assets and liabilities are carried at fair value, and are measured at fair value on a recurring basis. Fair value is defined as the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (the exit price). Financial instruments owned and Financial instruments sold, not yet purchased are recorded at fair value, and included in Other assets and Other liabilities, respectively. Contingent consideration, if any, is also recorded at fair value, and included in Other liabilities. The Company’s investments that are accounted for under the cost and equity methods are investments in companies that are not publicly traded and for which no established market for their securities exists. The fair value of these investments is only estimated if there are identified events or changes in circumstances that may have a significant adverse effect on the carrying value of the investment.
	The Company’s financial assets and liabilities recorded at fair value have been categorized based upon a fair value hierarchy in accordance with ASC 820-10. In accordance with ASC 820-10, the Company has categorized its financial assets and liabilities, based on the priority of the inputs to the valuation technique, into a three-level fair value hierarchy as set forth below.
	Level 1—Financial assets and liabilities whose values are based on unadjusted quoted prices for identifiable assets or liabilities in an active market that the company has the ability to access at the measurement date (examples include active exchange-traded equity securities, listed derivatives, and most U.S. Government and agency securities).
	Level 2—Financial assets and liabilities whose values are based on quoted prices in markets where trading occurs infrequently or whose values are based on quoted prices of instruments with similar attributes in active markets. Level 2 inputs include the following:
	·                  Quoted prices for identifiable or similar assets or liabilities in non-active markets (examples include corporate and municipal bonds which trade infrequently); and
	·                  Inputs other than quoted prices that are observable for substantially the full term of the asset or liability (examples include interest rate and currency swaps).
	Level 3—Financial assets and liabilities whose values are based on prices or valuation techniques that require inputs that are both unobservable and significant to the overall fair value measurement. These inputs reflect management’s own assumptions about the assumptions a market participant would use in pricing the asset or liability.
	Valuation Techniques
	A description of the valuation techniques applied to the Company’s major categories of assets and liabilities measured at fair value on a recurring basis are as follows:
	U.S. Treasury Securities - U.S. Treasury securities are valued using quoted market prices. Valuation adjustments are not applied. Accordingly, U.S. Treasury securities are generally categorized in Level 1 of the fair value hierarchy.
	Equity Securities - Equity securities include mostly exchange-traded securities and are valued based on quoted market prices. Accordingly, exchange-traded equity securities are generally categorized in Level 1 of the fair value hierarchy.  Non-exchange traded equity securities are measured primarily using broker quotations, pricing service data from external providers and prices observed for recently executed market transactions. Non-exchange traded equity securities are generally categorized within Level 2 of the fair value hierarchy.
	Corporate Bonds — Corporate bonds are measured primarily using broker quotations, pricing service data from external providers and prices observed for recently executed market transactions. Corporate bonds are generally categorized in Level 2 of the fair value hierarchy.
	Foreign government bonds — Foreign government bonds are mostly valued using quoted market prices. Accordingly, foreign government bonds are generally categorized in Level 1 of the fair value hierarchy.
	Derivative Contracts — Derivative contracts include instruments such as foreign exchange, commodity, fixed income and equity derivative contracts.
	Listed Derivative Contracts - Listed derivatives that are actively traded are valued based on quoted prices from the exchange and are categorized in Level 1 of the fair value hierarchy.
	OTC Derivative Contracts — Over-the-counter (“OTC”) derivative contracts include forwards, swaps, and options contracts related to foreign currencies. Depending on the product and the terms of the transaction, the fair value of OTC derivative products can be either observed or modeled using a series of techniques and model inputs from comparable benchmarks, including closed-form analytic formulas, such as the Black-Scholes option-pricing model, and simulation models or a combination thereof.  Many pricing models do not entail material subjectivity because the methodologies employed do not necessitate significant judgment, and the pricing inputs are observed from actively quoted markets. In the case of more established derivative products, the pricing models used by the Company are widely accepted by the financial services industry. OTC derivative products valued by the Company using pricing models generally fall into this category and are categorized in Level 2 of the fair value hierarchy.
	Equity warrants -  Non-exchange traded equity warrants are classified within Level 3 of the fair value hierarchy and are measured using the Black-Scholes model with key inputs impacting the valuation including the underlying security price, implied volatility, dividend yield, interest rate curve, strike price and maturity date.
	Contingent Consideration — The category consists primarily of contingent consideration related to one of the Company’s acquisitions.
	On November 14, 2013, the Company completed the acquisition of Contigo Limited, a provider of trading, portfolio risk management and logistics software for the energy industry. This contingent liability, which will be settled in a combination of cash and up to 50% of the Company’s common stock at the Company’s discretion, will be remeasured at fair value and is principally based on the acquired business’ future financial performance, including revenues and operating margins, from May 1, 2014 through April 30, 2015.  The payment of the contingent consideration, if expected financial results are met by Contigo Limited, would not significantly impact the Company’s financial position, results of operations or cash flows.
	The inputs used in estimating the fair value of these contingent considerations are both unobservable and significant to the overall fair value measurement of this liability, therefore the liability is categorized in Level 3 of the fair value hierarchy.
	In the three months ended March 31, 2014 and 2013, the Company did not have any material transfers among Level 1, Level 2, and Level 3.
	Financial Assets and Liabilities measured at fair value on a recurring basis as of March 31, 2014 are as follows:
		Quoted Prices in			Significant Other			Significant			Balance at
		Active Markets for			Observable			Unobservable			March 31,
		Identical Assets			Inputs			Inputs			2014
		(Level 1)			(Level 2)			(Level 3)
	Assets
	Other assets: Financial instruments owned:
	Equity securities	$	7		$	186		$	—		$	193
	Derivative contracts:
	Foreign exchange derivative contracts	$	112		$	630		$	—		$	742
	Fixed income derivative contracts	247			—			—			247
	Equity derivative contracts	—			—			—			—
	Netting (1)	(231		)	—			—			(231		)
	Total derivative contracts	$	128		$	630		$	—		$	758
	Total financial instruments owned	$	135		$	816		$	—		$	951
	Total	$	135		$	816		$	—		$	951
	Liabilities
	Other liabilities: Financial instruments sold, not yet purchased:
	Derivative contracts:
	Foreign exchange derivative contracts	$	4		$	675		$	—		$	679
	Fixed income derivative contracts	227			—			—			227
	Netting (1)		(231	)		—			—			(231	)
	Total derivative contracts	$	—		$	675		$	—		$	675
	Total financial instruments sold, not yet purchased	$	—		$	675		$	—		$	675
	Other liabilities: Contingent consideration	$	—		$	—		$	4,372		$	4,372
	Total	$	—		$	675		$	4,372		$	5,047
	(1)                                 Represents the impact of netting on a net-by-counterparty basis.
	Excluded from the table above is variation margin on net long derivative contracts related to exchange traded futures in the amount of $324 included within Receivables from brokers, dealers and clearing organizations.
	Financial Assets and Liabilities measured at fair value on a recurring basis as of December 31, 2013 are as follows:
		Quoted Prices in			Significant Other			Significant			Balance at
		Active Markets for			Observable			Unobservable			December 31,
		Identical Assets			Inputs			Inputs			2013
		(Level 1)			(Level 2)			(Level 3)
	Assets
	Other assets: Financial instruments owned:
	Equity securities	$	546		$	177		$	—		$	723
	Derivative contracts:
	Foreign exchange derivative contracts	$	—		$	679		$	—		$	679
	Equity derivative contracts	—			—			14			14
	Total derivative contracts	$	—		$	679		$	14		$	693
	Total financial instruments owned	$	546		$	856		$	14		$	1,416
Other assets: Other:
Equity security, available-for-sale	$	5,465		$	—		$	—		$	5,465
Total	$	6,011		$	856		$	14		$	6,881
Liabilities
Other liabilities: Financial instruments sold, not yet purchased:
Derivative contracts:
Foreign exchange derivative contracts	$	—		$	993		$	—		$	993
Total financial instruments sold, not yet purchased	$	—		$	993		$	—		$	993
Other liabilities: Contingent consideration	$	—		$	—		$	4,317		$	4,317
Total	$	—		$	993		$	4,317		$	5,310
Excluded from the table above is variation margin on net long derivative contracts related to exchange traded futures in the amount of $388 included within Receivables from brokers, dealers and clearing organizations.  Also excluded from the table above is variation margin on net short derivative contracts related to exchange traded futures in the amount of $596 included within Payables to brokers, dealers and clearing organizations.
Changes in Level 3 Financial Assets and Liabilities measured at fair value on a recurring basis for the three months ended March 31, 2014 are as follows:
	Opening			Total realized			Unrealized gains			Purchases			Issues		Sales		Settlements			Closing		Unrealized
	Balance			and unrealized			included													Balance at		gains
				gains (losses)			in Other													March 31,		(losses) for Level
				included in			comprehensive													2014		3 Assets /
				Net income (1)			(income) loss															Liabilities
																						Outstanding at
																						March 31,
																						2014
Assets
Other assets:
Financial instruments owned:
Equity derivative contracts	$	14		$	(14	)	$	—		$	—		$	—	$	—	$	—		$	—	$	(14	)
Liabilities
Other liabilities:
Contingent consideration:	$	4,317		$	28		$	27		$	—		$	—	$	—	$	—		$	4,372	$	28
(1)                                     Realized and unrealized gains (losses) are reported in Other income, net in the Condensed Consolidated Statements of Operations.
Changes in Level 3 Financial Assets and Liabilities measured at fair value on a recurring basis for the three months ended March 31, 2013 are as follows:
	Opening			Total realized			Unrealized gains			Purchases			Issues		Sales		Settlements			Closing		Unrealized gains
	Balance			and unrealized			included													Balance at		(losses) for Level
				gains (losses)			in Other													March 31,		3 Assets /
				included in			comprehensive													2013		Liabilities
				Income (1)			(income) loss															Outstanding at
																						March 31,
																						2013
Assets
Other assets:
Financial instruments owned:
Equity derivative contracts	$	28		$	(22	)	$	—		$	—		$	—	$	—	$	—		$	6	$	(22	)
Liabilities
Other liabilities:
Future purchase commitment:	$	3,209		$	744		$	208		$	—		$	—	$	—	$	—		$	2,257	$	744
Other liabilities:
Contingent consideration	$	518		$	—		$	—		$	—		$	—	$	—	$	(156	)	$	362	$	—
(1)             Realized and unrealized gains (losses) are reported in Other income, net in the Condensed Consolidated Statements of Operations.
The following tables present quantitative information about the significant unobservable inputs utilized by the Company in the fair value measurement of Level 3 Assets and Liabilities measured at fair value on a recurring basis, as of March 31, 2014 and December 31, 2013, respectively:
	Fair Value as of			Valuation		Unobservable Input(s)		Range (Weighted
	March 31,			Technique(s)				Average) (a)
	2014
Assets
Equity derivative contracts	$	—		Black-Scholes Merton Model		Expected volatility		30	%
Liabilities
Contingent consideration	$	4,372		Present value of expected payments		Discount rate		17	%
						Forecasted financial information		(b)
	Fair Value as of			Valuation		Unobservable Input(s)		Range (Weighted
	December 31,			Technique(s)				Average) (a)
	2013
Assets
Equity derivative contracts	$	14		Black-Scholes Merton Model		Expected volatility		30	%
Liabilities
Contingent consideration	$	4,317		Present value of expected payments		Discount rate		17	%
						Forecasted financial information		(b)
(a)         As of March 31, 2014 and December 31, 2013, each asset and liability type consists of one security.
(b)         The Company’s estimate of contingent consideration as of March 31, 2014 and December 31, 2013, respectively, was principally based on the acquired business’ projected future financial performance, including revenues and operating margins from May 1, 2014 through April 30, 2015.
Valuation Processes—Level 3 Measurements—Depending on the instrument, the Company utilizes a valuation technique, including discounted cash flow methods, option pricing methods and present value methods, as indicated above. Valuations are generally conducted by the Company, with consultation of a third-party valuation expert to develop the valuation model when the asset or liability is initially recorded. Each reporting period, the Company updates unobservable inputs utilizing relevant published information, where applicable. The Company has a formal process to review changes in fair value for satisfactory explanation.
Sensitivity Analysis—Level 3 Measurements
Equity derivative contracts - The significant unobservable inputs used in the fair value of the Company’s equity derivative contracts are the expected volatility and an estimated share price. Significant increases (decreases) in expected volatility or estimated share price would result in a higher (lower) fair value measurement.
Contingent consideration — The significant unobservable inputs used in the fair value in the Company’s contingent consideration are the discount rate and forecasted financial information.  Significant increases (decreases) in the discount rate would have resulted in a lower (higher) fair value measurement. Significant increases (decreases) in the forecasted financial information would have resulted in a higher (lower) fair value measurement.
For all significant unobservable inputs used in the fair value measurement of all Level 3 assets and liabilities, a change in one of the inputs would not necessarily result in a directionally similar change in the other.

DERIVATIVE_FINANCIAL_INSTRUMEN

DERIVATIVE FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2014
DERIVATIVE FINANCIAL INSTRUMENTS	'
DERIVATIVE FINANCIAL INSTRUMENTS	'
	13. DERIVATIVE FINANCIAL INSTRUMENTS
	The Company uses foreign exchange derivative contracts, including forward contracts and foreign currency swaps, to reduce the effects of fluctuations in certain assets and liabilities denominated in foreign currencies. The Company also hedges a portion of its foreign currency exposures on anticipated foreign currency denominated revenues and expenses by entering into forward foreign exchange contracts. As of March 31, 2014 and December 31, 2013, none of these contracts were designated as foreign currency cash flow hedges under ASC 815-10, Derivatives and Hedging (“ASC 815-10”).
	The Company provides brokerage services to its customers for exchange-traded and over-the-counter derivative products, which include futures, forwards and options contracts. The Company may enter into principal transactions for exchange-traded and over-the-counter derivative products to facilitate customer trading activities or to engage in principal trading for the Company’s own account.
	The Company monitors market risk exposure from its matched principal business and principal trading business by regularly monitoring both (i) its concentration of market risk to financial instruments, countries or counterparties and (ii) trades that have not settled within prescribed settlement periods or volume thresholds. Additionally, market risks are monitored and mitigated by the use of the Company’s proprietary, electronic risk monitoring system, which provides daily credit reports in each of the Company’s geographic regions that analyze credit concentration and facilitates the regular monitoring of transactions against key risk indicators.
	For certain derivative contracts, the Company has entered into agreements with counterparties that allow for the netting of positions. The Company reports these derivative contracts on a net-by-counterparty basis when management believes that a legal and enforceable right of offset exists under these agreements.
	Fair values of derivative contracts on a gross and net basis as of March 31, 2014 and December 31, 2013 are as follows:
		March 31, 2014						December 31, 2013
	Derivatives not designated as hedging	Derivative			Derivative			Derivative			Derivative
	instruments under ASC 815-10	Assets(1)			Liabilities(2)			Assets(1)			Liabilities(2)
	Foreign exchange derivative contracts	$	986		$	867		$	679		$	993
	Commodity derivative contracts	29,974			29,886			17,604			17,216
	Fixed income derivative contracts	7,882			7,679			15,824			16,415
	Equity derivative contracts	22			25			24			15
	Total fair value of derivative contracts	$	38,864		$	38,457		$	34,131		$	34,639
	Counterparty netting	(37,782		)	(37,782		)	(33,050		)	(33,050		)
	Total fair value	$	1,082		$	675		$	1,081		$	1,589
	(1)                     Reflects futures and options on futures contracts within Receivables from brokers, dealers and clearing organizations and options and forwards contracts within Other assets.
	(2)                     Reflects futures and options on futures contracts within Payables to brokers, dealers and clearing organizations and options and forwards contracts within Other liabilities.
	As of March 31, 2014 and December 31, 2013, the Company had outstanding forward foreign exchange hedge contracts with a combined notional value of $91,537 and $86,170, respectively. Approximately $33,432 and $27,659 of these forward foreign exchange contracts represents a hedge of Euro, British pound and Swiss franc-denominated balance sheet positions at March 31, 2014 and December 31, 2013, respectively. The remaining outstanding forward foreign exchange contracts are hedges of anticipated future cash flows.
	In addition to the Company’s outstanding forward foreign exchange hedge contracts, the following table includes the outstanding long and short notional amounts on a gross basis of derivative financial instruments as of March 31, 2014 and December 31, 2013:
		March 31, 2014						December 31, 2013
		Long			Short			Long			Short
	Foreign exchange derivative contracts	$	286		$	148,055		$	—		$	—
	Commodity derivative contracts	950,241			938,030			349,004			342,573
	Fixed income derivative contracts	9,890,091			10,191,069			9,415,546			10,047,771
	Equity derivative contracts	1,181			1,174			5,731			220
	The following is a summary of the effect of derivative contracts on the Condensed Consolidated Statements of Operations for the three months ended March 31, 2014 and 2013:
		Location of Gain (Loss)		Amount of Gain (Loss) Recognized in Income on
				Derivatives
	Derivatives not designated as hedging	Recognized in Income on		For the Three Months			For the Three Months Ended
	instruments under ASC 815-10	Derivatives		Ended March 31, 2014			March 31, 2013
	Foreign exchange derivative contracts	-1		$	295		$	(791	)
	Commodity derivative contracts	Principal transactions		1,753			2,499
	Fixed income derivative contracts	Principal transactions		3,130			2,992
	Equity derivative contracts	-2		7			(297		)
	(1)         For the three months ended March 31, 2014, approximately $202 of gains on foreign exchange derivative contracts were included within Other income, net and approximately $93 of gains on foreign currency options were included within Principal transactions.  For the three months ended March 31, 2013, approximately $80 of losses on foreign exchange derivative contracts were included within Other income, net and approximately $711 of losses on foreign currency options were included within Principal transactions.
	(2)         For the three months ended March 31, 2014, approximately $14 of losses on equity derivative contracts were included within Other income, net and approximately $21 of gains on equity derivative contracts were included within Principal transactions. For the three months ended March 31, 2013, approximately $22 of losses on equity derivative contracts were included within Other income, net and approximately $275 of losses on equity derivative contracts were included within Principal transactions.
	The following is a summary of derivative contracts, by counterparty, including the gross amounts offset in the Condensed   Consolidated Statements of Financial Position as of March 31, 2014:
								Net Amounts of
					Gross Amount			Assets Offset in the			Gross Amounts Not Offset in the
					Offset in the			Condensed			Condensed Consolidated Statements
		Gross			Condensed			Consolidated			of Financial Condition
		Amounts of			Consolidated			Statements of						Cash Collateral
		Recognized			Statements of			Financial Position						Received/
	Counterparties	Assets			Financial Position			-1			Derivatives (2)			(Pledged)		Net Amount
	Derivative Assets:
	Counterparty A	$	114		$	—		$	114		$	—		$	—	$	114
	Counterparty B	29,973			29,886			87			—			—		87
	Counterparty C	8,261			7,896			365			—			—		365
	Counterparty E	516			—			516			—			—		516
	Total	$	38,864		$	37,782		$	1,082		$	—		$	—	$	1,082
	Derivative Liabilities:
	Counterparty A	$	540		$	—		$	540		$	—		$	—	$	540
	Counterparty B	29,886			29,886			—			—			—		—
	Counterparty C	7,896			7,896			—			—			—		—
	Counterparty E	135			—			135			—			—		135
	Total	$	38,457		$	37,782		$	675		$	—		$	—	$	675
	(1)         The total reconciles to the aggregate of total derivative contracts in the fair value measurements table and the variation margin on exchange traded futures for the respective periods; both reflected in Note 12. Derivative assets and derivative liabilities are reflected within Other assets and Other Liabilities, respectively, with the exception of futures and options on futures contracts. Futures and options on futures contracts are included within Receivables from and Payables to brokers, dealers, and clearing organizations, as applicable.
	(2)         As of March 31, 2014, the Company does not have any derivative positions under a master netting agreement that are not netted.
	The following is a summary of derivative contracts, by counterparty, including the gross amounts offset in the Consolidated Statements of Financial Position as of December 31, 2013:
								Net Amounts of
					Gross Amounts			Assets Offset in the			Gross Amounts Not Offset in the
					Offset in the			Condensed			Condensed Consolidated Statements
				Condensed			Consolidated			of Financial Condition
	Gross Amounts of			Consolidated			Statements of						Cash Collateral
	Recognized			Statements of			Financial Position						Received/
Counterparties	Assets			Financial Position			-1			Derivatives (2)			(Pledged)		Net Amount
Derivative Assets:
Counterparty A	$	268		$	—		$	268		$	—		$	—	$	268
Counterparty B	17,604			17,216			388			—			—		388
Counterparty C	15,834			15,834			—			—			—		—
Counterparty D	14			—			14			—			—		14
Counterparty E	411			—			411			—			—		411
Total	$	34,131		$	33,050		$	1,081		$	—		$	—	$	1,081
Derivative Liabilities:
Counterparty A	$	834		$	—		$	834		$	—		$	—	$	834
Counterparty B	17,216			17,216			—			—			—		—
Counterparty C	16,430			15,834			596			—			—		596
Counterparty E	159			—			159			—			—		159
Total	$	34,639		$	33,050		$	1,589		$	—		$	—	$	1,589
(1)         The total reconciles to the aggregate of total derivative contracts in the fair value measurements table and the variation margin on exchange traded futures for the respective periods; both reflected in Note 12.  Derivative assets and derivative liabilities are reflected within Other assets and Other Liabilities, respectively, with the exception of futures and options on futures contracts. Futures and options on futures contracts are included within Receivables from and Payables to brokers, dealers, and clearing organizations, as applicable.
(2)         As of December 31, 2013, the Company does not have any derivative positions under a master netting agreement that are not netted.

VARIABLE_INTEREST_ENTITIES

VARIABLE INTEREST ENTITIES	3 Months Ended
	Mar. 31, 2014
VARIABLE INTEREST ENTITIES	'
VARIABLE INTEREST ENTITIES	'
	14. VARIABLE INTEREST ENTITIES
	Non-consolidated VIEs
	The Company holds interests in certain VIEs that it does not consolidate. The Company has determined that it is not the primary beneficiary, mostly due to a lack of significant economic interest, voting power and/or power to direct the activities that would most significantly impact the economic performance of the VIE.
	As of March 31, 2014 and December 31, 2013, the Company had certain variable interests in non-consolidated VIEs in the form of direct equity interests, a convertible note and a non-recourse loan. The carrying amount of these VIEs was $3,654 as of March 31, 2014 and $3,954 as of December 31, 2013, and was recorded within Other assets. These VIEs include a technology provider with a proprietary financial application, trading entities in which the Company has provided initial capital to fund trading activities, investment fund managers and a commodity pool operator. The Company also provides clearing and other administrative services to certain of these non-consolidated VIEs. The maximum exposure to loss on these VIEs was $4,823 as of March 31, 2014 and $4,592 as of December 31, 2013, respectively.
	As of March 31, 2014 and December 31, 2013, the Company had certain variable interests in non-consolidated VIEs in the form of trading margin accounts in which the Company had an economic interest in profits and losses and has provided initial capital to fund trading activities. The Company also provides clearing and other administrative services to these non-consolidated VIEs. The carrying amount of these VIEs was $1,538 as of March 31, 2014 and $1,653 as of December 31, 2013, and was recorded within Receivables from brokers, dealers and clearing organizations.  The maximum exposure to loss of these VIEs was $1,538 as of March 31, 2014 and $1,653 as of December 31, 2013.
	The Company has not recorded any liabilities with respect to non-consolidated VIEs.
	Consolidated VIEs
	In December 2010, Kyte invested in a limited company that is focused on developing a proprietary trading business. The limited company is a VIE and it was determined that the Company is the primary beneficiary of this VIE because the Company, through Kyte, was the provider of the majority of this VIE’s start-up capital and has the power to direct the activities of this VIE that most significantly impact its economic performance, primarily through its voting percentage and consent rights on the activities that would most significantly influence the entity. The consolidated VIE had total assets of $10,413 at March 31, 2014 and $8,953 as of December 31, 2013, which primarily consisted of clearing margin. There were no material restrictions on the consolidated VIE’s assets. The consolidated VIE had total liabilities of $3,289 at March 31, 2014 and $2,652 at December 31, 2013.

REGULATORY_REQUIREMENTS

REGULATORY REQUIREMENTS	3 Months Ended
	Mar. 31, 2014
REGULATORY REQUIREMENTS	'
REGULATORY REQUIREMENTS	'
	15.    REGULATORY REQUIREMENTS
	Many of the Company’s material operating subsidiaries are subject to regulatory restrictions and minimum capital requirements, which may restrict the Company’s ability to withdraw capital from its subsidiaries.
	Certain domestic subsidiaries of the Company are registered as a broker-dealer, swap execution facility (“SEF”) or introducing broker and therefore are subject to the applicable rules and regulations of the Securities Exchange Commission (“SEC”) and the Commodity Futures Trading Commission (“CFTC”). Certain foreign subsidiaries are also registered as introducing brokers with the CFTC. These rules contain uniform minimum net capital requirements, as defined, and also require a significant part of the registrants’ assets be kept in relatively liquid form. As of March 31, 2014, each of the Company’s subsidiaries that are subject to these regulations had net capital in excess of their minimum capital requirements.
	Certain of the Company’s European subsidiaries are regulated by the Financial Conduct Authority (“FCA”) and must maintain financial resources (as defined by the FCA) in excess of FCA’s total financial resources requirement. As of March 31, 2014, each of these European subsidiaries had financial resources in excess of their requirements.
	Certain other subsidiaries of the Company are subject to similar regulatory and other requirements in the jurisdictions in which they operate and, as of March 31, 2014, each of these subsidiaries was in compliance with its regulatory capital requirements.
	The regulatory requirements referred to above may restrict the Company’s ability to withdraw capital from its regulated subsidiaries. As of March 31, 2014, the Company had the following aggregate regulatory capital, in individually regulated entities, in each of its operating regions:
		Americas		EMEA		Asia
	Regulatory capital	$	26,367	$	144,528	$	31,620
	Minimum regulatory capital required	7,645		113,526		9,199
	Excess regulatory capital	$	18,722	$	31,002	$	22,421
	The regulatory requirements set forth in the table above include aggregated amounts held in individually regulated entities in each of the Company’s operating regions, calculated by entity, to comply with the requirements of various regulators for capital requirements in each of those entities. In situations where the Company is subject to the requirements of multiple regulators, the Company has included the more onerous capital requirement in the table above.

SEGMENT_AND_GEOGRAPHIC_INFORMA

SEGMENT AND GEOGRAPHIC INFORMATION	3 Months Ended
	Mar. 31, 2014
SEGMENT AND GEOGRAPHIC INFORMATION	'
SEGMENT AND GEOGRAPHIC INFORMATION	'
	16.    SEGMENT AND GEOGRAPHIC INFORMATION
	In accordance with ASC 280-10, Segment Reporting (“ASC 280-10”) and based on the nature of the Company’s operations, products and services in each geographic region, the Company determined that it has four reportable segments: (i) Americas Brokerage, (ii)  EMEA Brokerage, (iii) Asia Brokerage and (iv) Clearing and Backed Trading. The Company’s brokerage operations provide brokerage services in four broad product categories: fixed income, financial, equity and commodity. The Clearing and Backed Trading segment encompasses the Company’s clearing, risk management, settlement and other back-office services, as well as the capital we provide to start-up trading groups, small hedge funds, market-makers and individual traders. Information about other business activities is disclosed in an “All Other” category. All Other includes the results of the Company’s software, analytics and market data operations. All Other also includes revenues and expenses that are not directly assignable to one of the Company’s reportable segments, primarily consisting of indirect costs related to the Company’s brokerage segments as well as all of the Company’s corporate business activities.
	The accounting policies of the segments are the same as those described above in Note 2—Summary of Significant Accounting Policies. The Company evaluates performance of the operating segments based on income (loss) before income taxes, which it defines as revenues less direct expenses.
	Revenues within each brokerage segment include revenues that are directly related to providing brokerage services along with interest and other income (loss) directly attributable to the operating segment. Revenues within the Clearing and Backed Trading segment primarily include revenues that are directly related to providing clearing services along with the Company’s share of profit (loss) on trading activity from capital investments. The Company’s Clearing and Backed Trading segment incurs exchange fees on behalf of its clients, which are reflected within Interest and transaction-based expenses. The reimbursement of these fees from the Company’s clients is reflected within Total Revenues. Therefore, the Company evaluates the top-line performance of its Clearing and Backed Trading segment using Revenues, net of interest and transaction-based expenses.
	Direct expenses of the operating segments are those expenses that are directly related to providing the brokerage or clearing services and trading activities of the operating segments and include compensation expense related to the segment management and staff, communication and market data, travel and promotion, and certain professional fees and other expenses that are directly incurred by the operating segments. However, the Company does not allocate to its brokerage operating segments certain expenses that it manages separately at the corporate level. The unallocated costs include rent and occupancy, depreciation and amortization, professional fees, interest on borrowings and other expenses and are included in the All Other operating segment. Management generally does not consider the unallocated costs in its performance measurement of its reportable segments.
	Selected financial information for the Company’s reportable segments is presented below for periods indicated:
		Three Months Ended March 31, 2014
		Americas		EMEA		Asia		Clearing		All Other			Total
		Brokerage		Brokerage		Brokerage		and Backed
								Trading
	Total revenues	$	61,698	$	89,300	$	19,223	$	44,293	$	26,225		$	240,739
	Revenues, net of interest and transaction-based expenses	58,752		86,427		19,103		11,140		27,005			202,427
	Income (loss) before income taxes	14,342		28,704		5,632		931		(44,106		)	5,503
		Three Months Ended March 31, 2013
		Americas		EMEA		Asia		Clearing		All Other			Total
		Brokerage		Brokerage		Brokerage		and Backed
								Trading
	Total revenues	$	69,258	$	87,668	$	18,359	$	47,610	$	21,497		$	244,392
	Revenues, net of interest and transaction-based expenses	66,148		84,993		18,249		10,339		21,788			201,517
	Income (loss) before income taxes	19,394		26,037		4,822		610		(50,768		)	95
	In addition, with the exception for goodwill, the Company does not identify or allocate assets by operating segment, nor does its chief operating decision maker evaluate operating segments using discrete asset information. See Note 4 for goodwill by reportable segment.
	For the three months ended March 31, 2014 and 2013, the U.K. is the only individual foreign country that accounts for 10% or more of the Company’s total revenues and total long-lived assets. Information regarding revenue for the three months ended March 31, 2014 and 2013, and information regarding long-lived assets (defined as property, equipment, leasehold improvements and software inventory) in geographic areas as of March 31, 2014 and December 31, 2013, are as follows:
		Three Months Ended
		March 31,
		2014		2013
	Revenues:
	United States	$	63,213	$	69,175
	United Kingdom	124,305		125,486
	Other	53,221		49,731
	Total	$	240,739	$	244,392
		Three Months Ended
		March 31,
		2014		2013
	Revenues, net of interest and transaction-based expenses:
	United States	$	62,096	$	67,431
	United Kingdom	89,819		87,187
	Other	50,512		46,899
	Total	$	202,427	$	201,517
		March 31,		December 31,
		2014		2013
	Long-lived Assets, as defined:
	United States	$	50,544	$	49,987
	United Kingdom	11,379		11,762
	Other	4,322		4,396
	Total	$	66,245	$	66,145
	Revenues are attributed to geographic areas based on the location of the particular subsidiary of the Company which generated the revenues.

SUBSEQUENT_EVENTS

SUBSEQUENT EVENTS	3 Months Ended
	Mar. 31, 2014
SUBSEQUENT EVENTS	'
SUBSEQUENT EVENTS	'
	17.    SUBSEQUENT EVENTS
	In April 2014, the Board of Directors declared a quarterly cash dividend of $0.05 per share payable on May 30, 2014 to stockholders of record on May 16, 2014.
	Subsequent events have been evaluated for recording and disclosure in the notes to the Condensed Consolidated Financial Statements through the filing date of this Form 10-Q.

SUMMARY_OF_SIGNIFICANT_ACCOUNT1

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2014
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
Basis of Presentation	'
	Basis of Presentation— The Company’s Condensed Consolidated Financial Statements (Unaudited) are prepared in accordance with accounting principles generally accepted in the United States of America, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingencies in the Condensed Consolidated Financial Statements. Certain estimates and assumptions relate to the accounting for acquired goodwill and intangible assets, fair value measurements, compensation accruals, tax liabilities and the potential outcome of litigation matters. Management believes that the estimates utilized in the preparation of the Condensed Consolidated Financial Statements are reasonable and prudent. Actual results could differ materially from these estimates.
	Certain amounts in the Condensed Consolidated Statements of Cash Flows have been reclassified to conform to the current year presentation.
	These 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, 2013 (the “2013 Form 10-K”). The condensed consolidated financial information as of December 31, 2013 presented in this Form 10-Q has been derived from audited Consolidated Financial Statements not included herein.
	These unaudited Condensed Consolidated Financial Statements reflect all adjustments that are, in the opinion of management, necessary for a fair statement of the results for the interim periods presented. These adjustments are of a normal, recurring nature. Interim period operating results may not be indicative of the operating results for a full year.
Consolidation Policies	'
	Consolidation Policies
	General— The Condensed Consolidated Financial Statements include the accounts of the Company, its wholly-owned subsidiaries and subsidiaries that are treated as such and other entities in which the Company has a controlling financial interest. For consolidated subsidiaries that are less than wholly-owned, equity interests that are not owned by the Company are referred to as non-controlling interests. The portion of net income attributable to non-controlling interests for such subsidiaries is presented as Net income attributable to non-controlling interests on the Condensed Consolidated Statements of Operations, and the portion of the stockholders’ equity of such subsidiaries is presented as Non-controlling interests in the Condensed Consolidated Statements of Financial Condition and Condensed Consolidated Statement of Changes in Stockholders’ Equity. All intercompany transactions and balances have been eliminated.
Variable Interest Entities	'
	Variable Interest Entities—The Company determines whether it holds any interests in entities deemed to be a variable interest entity (“VIE”). A 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 has a controlling financial interest and will consolidate a VIE if it is the primary beneficiary.
	The primary beneficiary is the party that has both (i) the power to direct the activities of the VIE that most significantly impact the economic performance of the entity and (ii) the obligation to absorb losses of the entity that could be potentially significant to the VIE or the right to receive benefits from the entity that could be potentially significant.
	As of March 31, 2014, the company holds interests in certain VIEs. One of these VIEs is consolidated because it was determined that the Company is the primary beneficiary of this VIE because (1) the Company provided the majority of the VIE’s start-up capital and (2) the Company has consent rights regarding those activities that the Company believes would most significantly impact the economic performance of the entity. The remaining VIEs are not consolidated as it was determined that the Company is not the primary beneficiary due to the level of equity ownership and voting power.  The Company reassesses its evaluation of whether an entity is a VIE when certain events occur, such as changes in economic ownership and voting power.  The Company reassesses its determination of whether it is the primary beneficiary of a VIE on an ongoing basis based on current facts and circumstances.  See Note 14 for disclosures on Variable Interest Entities.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents— Cash and cash equivalents consist of cash and highly liquid investments purchased with an original maturity of three months or less.
Cash and Securities Segregated Under Federal and Other Regulations	'
	Cash and Securities Segregated Under Federal and Other Regulations—The Company holds cash and securities representing funds received in connection with customer trading activities. The Company’s subsidiaries are required to satisfy regulations mandated by their primary regulators to segregate or set aside cash or equivalent securities to satisfy regulations, promulgated to protect customer assets.
Accounts Receivable	'
	Accounts Receivable —Accounts receivable largely represents commissions due from brokers, dealers, banks and other financial and nonfinancial institutions for the execution of securities, commodities, foreign exchange and other derivative brokerage transactions. Also, included within Accounts receivable are the billed portion of existing contracts from customers related to the licensing, support and maintenance of software, analytics and market data, as well as any unbilled but earned portion of any services provided to such customers. In estimating the allowance for doubtful accounts, management considers the length of time receivables are past due and historical experience. In addition, if the Company is aware of a client’s inability to meet its financial obligations, a specific provision for doubtful accounts is recorded in the amount of the estimated losses that will result from the inability of that client to meet its financial obligation.
Receivables from and Payables to Brokers, Dealers and Clearing Organizations	'
	Receivables from and Payables to Brokers, Dealers and Clearing Organizations—Receivables from and payables to brokers, dealers and clearing organizations primarily represent: (i) principal transactions for which the stated settlement dates have not yet been reached, (ii) principal transactions which have not settled as of their stated settlement dates, (iii) cash, including deposits, held at clearing organizations and exchanges in support of the Company’s clearing business and to facilitate settlement and clearance of matched principal transactions and (iv) the spread on matched principal transactions that have not yet been remitted from/to clearing organizations and exchanges.
Property, Equipment and Leasehold Improvements	'
	Property, Equipment and Leasehold Improvements—Property, equipment and leasehold improvements are stated at cost, less accumulated depreciation and amortization. Depreciation and amortization are calculated using the straight-line method, generally over three to seven years. Property and equipment are depreciated over their estimated useful lives. Leasehold improvements are amortized over the shorter of the remaining term of the respective lease to which they relate or the remaining useful life of the leasehold improvement. Internal and external costs incurred in developing or obtaining computer software for internal use are capitalized in accordance with Accounting Standards Codification (“ASC”) 350 Intangibles—Goodwill and Other (“ASC 350”), and are amortized on a straight-line basis over the estimated useful life of the software, generally three years. General and administrative costs related to developing or obtaining such software are expensed as incurred.
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets—Goodwill represents the excess of the purchase price allocation over the fair value of tangible and identifiable intangible net assets acquired. The goodwill associated with each business combination is allocated to the related reporting units, which are determined based on how the Company’s businesses are managed and how they are reviewed by the Company’s chief operating decision maker. Other intangible assets are recorded at their fair value upon completion of a business combination or certain other transactions. Substantially all of the firm’s identifiable intangible assets are considered to have definite lives and are amortized on a straight-line basis over their estimated useful lives.
	In accordance with ASC 350, goodwill is not amortized, but instead is periodically tested for impairment. The Company reviews goodwill for impairment on an annual basis as of November 1 of each fiscal year or whenever an event occurs or circumstances change that could reduce the fair value of a reporting unit below its carrying amount. See Note 4 for further information.
Prepaid Bonuses and Forgivable Employee Loans	'
	Prepaid Bonuses and Forgivable Employee Loans—Prepaid bonuses and forgivable loans to employees are stated at historical value net of amortization when the agreement between the Company and the employee provides for the return of proportionate amounts of the bonus or loan outstanding if employment is terminated in certain circumstances prior to the end of  the term of the agreement. Amortization is calculated using the straight-line method over the term of the contract, which is generally two to four years, and is recorded in Compensation and employee benefits. The Company generally expects to recover the unamortized portion of prepaid bonuses and forgivable loans when employees voluntarily terminate their employment or if their employment is terminated for cause prior to the end of the term of the agreement. The prepaid bonuses and forgivable loans are included in Other assets in the Condensed Consolidated Statements of Financial Condition. At March 31, 2014 and December 31, 2013, the Company had prepaid bonuses of $22,699 and $23,499, respectively. At March 31, 2014 and December 31, 2013, the Company had forgivable employee loans and advances to employees of $22,448 and $24,109, respectively. Amortization of prepaid bonuses and forgivable employee loans for the three months ended March 31, 2014 and 2013 was $6,720 and $6,348, respectively and is included within Compensation and employee benefits.
Investments	'
	Investments—When the Company does not have a controlling financial interest in an entity but can exert significant influence over the entity’s operating and financial policies, the investment is accounted for under the equity method of accounting in accordance with ASC 323-10, Investments—Equity Method and Joint Ventures (“ASC 323-10”). Significant influence generally exists when the Company owns 20% to 50% of the entity’s common stock or in-substance common stock. The Company initially records the investment at cost and adjusts the carrying amount each period to recognize its share of the earnings and losses of the investee based on the percentage of ownership. At March 31, 2014 and December 31, 2013, the Company had equity method investments with a carrying value of $31,358 and $36,976, respectively, included within Other assets. The Company also provides clearing and other administrative services to certain of these equity method investees.
	Investments for which the Company does not have the ability to exert significant influence over operating and financial policies are generally accounted for using the cost method of accounting in accordance with ASC 325-10, Investments—Other (“ASC 325-10”). At March 31, 2014 and December 31, 2013, the Company had cost method investments of $4,614 and $5,087, respectively, included within Other assets.  The fair value of the Company’s cost method investments are not estimated if there are no identified events or changes in circumstances that may have a significant adverse effect on the fair value. The Company monitors its equity and cost method investments for indicators of impairment each reporting period.
	The Company accounts for its marketable equity securities and its debt securities in accordance with ASC 320-10, Investments—Debt and Equity Securities (“ASC 323-10”). Investments that are owned by the Company’s broker-dealer subsidiaries are recorded at fair value with realized and unrealized gains and losses reported in net income. Investments designated as available-for-sale that are owned by the Company’s non broker-dealer subsidiaries are recorded at fair value with unrealized gains or losses reported as a separate component of other comprehensive income (loss), net of tax.  The fair value of the Company’s available-for-sale securities was $0 and $5,465 as of March 31, 2014 and December 31, 2013, respectively, and is included within Other assets.
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments—In accordance with ASC 820-10, Fair Value Measurements and Disclosures (“ASC 820-10”), the Company estimates fair values of financial instruments using relevant market information and other assumptions. Fair value estimates involve uncertainties and matters of significant judgment in interpreting market data and, accordingly, changes in assumptions or in market conditions could adversely affect the estimates. The Company also discloses the fair value of its financial instruments in accordance with the fair value hierarchy as set forth by ASC 820-10. See Note 12 for further information.
Derivative Financial Instruments	'
	Derivative Financial Instruments—The Company enters into derivative transactions for a variety of reasons, including managing its exposure to risk arising from changes in foreign currency, facilitating customer trading activities and, in certain instances, to engage in principal trading for the Company’s own account. Derivative assets and liabilities are carried on the Condensed Consolidated Statements of Financial Condition at fair value, with changes in the fair value recognized in the Condensed Consolidated Statements of Operations. Contracts entered into to manage risk arising from changes in foreign currency are recognized in Other income and contracts entered into to facilitate customer transactions and principal trading are recognized in Principal transactions. Derivatives are reported on a net-by-counterparty basis when management believes that a legal and enforceable right of offset exists under these agreements. See Note 13 for further information.
Payables to Clearing Services Customers	'
	Payables to Clearing Services Customers—Payables to clearing services customers include amounts due on cash and margin transactions, including futures contracts transacted on behalf of customers.
Revenue Recognition	'
	Revenue Recognition
	Brokerage Transactions—The Company provides brokerage services to its clients in the form of either agency or principal transactions. In agency transactions, the Company charges commissions for executing transactions between buyers and sellers. Agency commission revenues and related expenses are recognized on a trade date basis. These revenues are presented in “Agency Commissions”.  Principal transactions revenue is primarily derived from matched principal and principal trading transactions. Principal transactions revenues and related expenses are recognized on a trade date basis. The Company earns revenue from principal transactions on the spread between the buy and sell price of the security that is brokered. In matched principal transactions, the Company simultaneously agrees to buy instruments from one customer and sell them to another customer. These revenues are presented in “Principal Transactions”.  In the normal course of its matched principal and principal trading businesses, the Company may hold security positions overnight. These positions are marked to market on a daily basis.
	Clearing Services Revenues—The Company charges fees to customers for clearing services provided for cash and derivative transactions. Clearing services revenues are recorded on a trade date basis as customer transactions occur and are presented net of any customer negotiated rebates.
	Software, Analytics and Market Data Revenue Recognition— Software revenue consists primarily of fees charged for Trayport electronic trading software, which are typically billed on a subscription basis and are recognized ratably over the term of the subscription period, which ranges from one to five years. Analytics revenue consists primarily of software license fees for Fenics pricing tools which are typically billed on a subscription basis, and is recognized ratably over the term of the subscription period, which is generally three years. Market data revenue primarily consists of subscription fees and fees from customized one-time sales. Market data subscription fees are recognized on a straight-line basis over the term of the subscription period, which ranges from one to two years. Market data revenue from customized one-time sales is recognized upon delivery of the data. The Company markets its software, analytics and market data products through its direct sales force and, in some cases, indirectly through resellers. In general, the Company’s license agreements for such products do not provide for a right of return.
	Other Income, net—Included within Other income, net on the Company’s Condensed Consolidated Statements of Operations are revaluations of foreign currency derivative contracts, realized and unrealized transaction gains and losses on certain foreign currency denominated items, and gains and losses on certain investments, and interest income earned on short-term investments.
Compensation and Employee Benefits	'
	Compensation and Employee Benefits—The Company’s compensation and employee benefits have both a fixed and variable component. Base salaries and benefit costs are primarily fixed for all employees while bonuses constitute the variable portion of compensation and employee benefits. The Company may pay certain performance bonuses in restricted stock units (“RSUs”). The Company also may grant sign-on and retention bonuses for certain newly-hired or existing employees who agree to long-term employment agreements.
Share-Based Compensation	'
	Share-Based Compensation—The Company’s share-based compensation consists of RSUs. The Company accounts for share-based compensation in accordance with ASC 718 Compensation— Stock Compensation (“ASC 718”). This accounting guidance requires measurement of compensation expense for equity-based awards at fair value and recognition of compensation expense over the service period, net of estimated forfeitures. In all periods presented, the only share-based compensation expense recognized by the Company has been RSUs. The Company determines the fair value of RSUs based on the number of units granted and the grant date fair value of the Company’s common stock, measured as of the closing price on the date of grant. See Note 9 for further information.
Income Taxes	'
	Income Taxes— In accordance with ASC 740, Income Taxes (“ASC 740”), the Company provides for income taxes using the asset and liability method under which deferred income taxes are recognized for the estimated future tax effects attributable to temporary differences and carryforwards that result from events that have been recognized either in the financial statements or the income tax returns, but not both. The measurement of current and deferred income tax assets and liabilities is based on provisions of enacted tax laws. Valuation allowances are recognized if, based on the weight of available evidence, it is more likely than not that some portion of the deferred tax assets will not be realized. Management applies the more likely than not criteria prior to recognizing a financial statement benefit for a tax position taken (or expected to be taken) in a tax return. The Company recognizes interest and/or penalties related to income tax matters in interest expense and other expense, respectively.
	For the three months ended March 31, 2014 the Company recorded income tax expense of $1.1 million.  The expense yields an effective rate lower than the federal statutory rate of 35% due to the geographical mix of pre-tax income.
	For the three months ended March 31, 2013 the Company recorded a benefit from income taxes of $4.9 million. The benefit was primarily due to: (i) a tax benefit under the American Taxpayer Relief Act of 2012 related to taxes previously provided for, (ii) a tax benefit arising from a change in our view about the deductibility of a reserve previously deemed nondeductible, as a result of new information received in the first quarter of 2013 and (iii) the release of a tax liability in a foreign subsidiary where the statute of limitations has now expired.
Treasury Stock	'
	Treasury Stock—The Company accounts for Treasury stock using the cost method. Treasury stock held by the Company may be reissued with respect to vested RSUs in qualified jurisdictions. The Company’s policy is to account for these shares as a reduction of Treasury stock on a first-in, first-out basis.
Foreign Currency Translation Adjustments and Transactions	'
	Foreign Currency Translation Adjustments and Transactions— Assets and liabilities of foreign subsidiaries having non-U.S. dollar functional currencies are translated at the period end rates of exchange, and revenue and expenses are translated at the average rates of exchange for the period. Gains or losses resulting from translating foreign currency financial statements are reflected in foreign currency translation adjustments and are reported as a separate component of comprehensive income (loss) and included in accumulated other comprehensive income in the Condensed Consolidated Statement of Changes in Stockholders’ Equity. Net losses resulting from remeasurement of foreign currency transactions and balances were $92 and $273 for the three months ended March 31, 2014 and 2013, respectively, and are included in Other income, net in the Condensed Consolidated Statements of Operations.
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements—In March 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2013-05, “Foreign Currency Matters” (“ASU 2013-05”), which clarifies the accounting for the cumulative translation adjustment when a parent either sells or transfers a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a foreign subsidiary or group of assets. ASU 2013-05 provides that the parent should release cumulative translation adjustment into net income only if the sale or transfer results in the complete or substantially complete liquidation of the foreign entity in which the subsidiary or group of assets had resided. This guidance was effective for the Company’s fiscal year beginning January 1, 2014, and is being applied prospectively.  The adoption of ASU 2013-05 does not have a material impact on the Company’s condensed consolidated financial statements.
	In July 2013, the FASB issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (“ASU 2013-11”). ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or tax credit carryforward, unless such tax loss or credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes resulting from the disallowance of a tax position. In the event that the tax position is disallowed or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit shall be presented in the financial statements as a liability and shall not be combined with deferred tax assets. The guidance was effective for the Company’s fiscal year beginning January 1, 2014, and is being applied prospectively. The adoption of ASU 2013-11 does not have a material impact on the Company’s condensed consolidated financial statements.

RECEIVABLES_FROM_AND_PAYABLES_1

RECEIVABLES FROM AND PAYABLES TO BROKERS, DEALERS AND CLEARING ORGANIZATIONS (Tables)	3 Months Ended
	Mar. 31, 2014
RECEIVABLES FROM AND PAYABLES TO BROKERS, DEALERS AND CLEARING ORGANIZATIONS	'
Schedule of amounts receivable from and payable to brokers, dealers and clearing organizations	'
		March 31,		December 31,
		2014		2013
	Receivables from brokers, dealers and clearing organizations:
	Contract value of fails to deliver	$	635,431	$	123,470
	Receivables from and deposits with clearing organizations and financial institutions	216,350		172,257
	Total	$	851,781	$	295,727
	Payables to brokers, dealers and clearing organizations:
	Contract value of fails to receive	$	614,194	$	123,393
	Payables to clearing organizations and financial institutions	21,963		3,052
	Net pending trades	4,264		455
	Total	$	640,421	$	126,900
Schedule of cash and securities segregated under federal and other regulations or Receivables from brokers, dealers and clearing organizations	'
		March 31,		December 31,
		2014		2013
	Cash segregated under federal and other regulations	62,895		62,684
	Receivables from brokers, dealers, and clearing organizations	137,079		114,839
	Total	$	199,974	$	177,523

GOODWILL_AND_INTANGIBLE_ASSETS1

GOODWILL AND INTANGIBLE ASSETS (Tables)	3 Months Ended
	Mar. 31, 2014
GOODWILL AND INTANGIBLE ASSETS	'
Schedule of changes in the carrying amount of the Company's goodwill	'
		December 31,		Goodwill		Adjustments			Foreign currency		March 31,
		2013		acquired					translation		2014
	Goodwill
	Americas Brokerage	$	83,289	$	—	$	—		$	—	$	83,289
	EMEA Brokerage	14,637		—		—			83		14,720
	Clearing and Backed Trading	23,259		—		—			150		23,409
	All Other	134,735		—		(60		)	27		134,702
		$	255,920	$	—	$	(60	)	$	260	$	256,120
Schedule of intangible assets	'
		March 31, 2014							December 31, 2013
		Gross		Accumulated		Net			Gross		Accumulated		Net
		amount		amortization		carrying			amount		amortization		carrying
				and foreign		value					and foreign		value
				currency							currency
				translation							translation
	Amortized intangible assets:
	Customer relationships	$	77,196	$	44,000	$	33,196		$	77,196	$	42,151	$	35,045
	Trade names	8,951		6,797		2,154			8,951		6,674		2,277
	Core technology	11,950		6,411		5,539			11,950		6,285		5,665
	Non-compete agreements	3,865		3,491		374			3,865		3,478		387
	Favorable lease agreements	620		600		20			620		580		40
	Patents	3,131		1,346		1,785			3,131		1,221		1,910
	Other	647		284		363			647		287		360
	Total	$	106,360	$	62,929	$	43,431		$	106,360	$	60,676	$	45,684
Schedule of expected amortization expense for the definite lived intangible assets	'
	2014 (remaining nine months)	$	7,277
	2015	9,609
	2016	7,693
	2017	4,333
	2018	3,510
	Thereafter	11,009
	Total	$	43,431

OTHER_ASSETS_AND_OTHER_LIABILI1

OTHER ASSETS AND OTHER LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2014
OTHER ASSETS AND OTHER LIABILITIES	'
Schedule of other assets	'
		March 31,		December 31,
		2014		2013
	Deferred tax assets	$	48,779	$	45,694
	Investments accounted for under the cost method and equity method	35,972		42,063
	Prepaid bonuses	22,699		23,499
	Forgivable employee loans and advances to employees	22,448		24,109
	Deferred financing fees	6,332		6,786
	Software inventory, net	4,422		4,749
	Financial instruments owned	951		1,416
	Other	26,184		29,528
	Total Other assets	$	167,787	$	177,844
Schedule of other liabilities	'
		March 31,		December 31,
		2014		2013
	Payroll related liabilities	$	31,007	$	15,896
	Deferred revenues	10,483		9,199
	Unrecognized tax benefits	8,676		8,676
	Deferred tax liabilities	6,440		6,835
	Contingent consideration liabilities	4,372		4,317
	Financial instruments sold, not yet purchased	675		993
	Other	28,994		37,155
	Total Other liabilities	$	90,647	$	83,071

SHORTTERM_BORROWINGS_AND_LONGT1

SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Tables)	3 Months Ended
	Mar. 31, 2014
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'
Schedule of outstanding debt obligations	'
		March 31,		December 31,
		2014		2013
	8.375% Senior Notes due 2018	$	240,000	$	240,000
	Loans pursuant to Credit Agreement	10,000		10,000
	Total	$	250,000	$	250,000
Schedule of the carrying amounts and estimated fair values of the Company's Long-term debt	'
		March 31, 2014				December 31, 2013
		Carrying		Fair Value		Carrying		Fair Value
		Amount				Amount
	8.375% Senior Notes	$	240,000	$	257,400	$	240,000	$	251,100

EARNINGS_PER_SHARE_Tables

EARNINGS PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2014
EARNINGS PER SHARE	'
Schedule of basic and diluted earnings per share	'
		Three Months Ended March 31,
		2014			2013
	Basic earnings per share
	GFI’s net income	$	4,003		$	4,674
	Weighted average common shares outstanding	122,362,839			115,384,022
	Basic earnings per share	$	0.03		$	0.04
	Diluted earnings per share
	GFI’s net income	$	4,003		$	4,674
	Weighted average common shares outstanding	122,362,839			115,384,022
	Effect of dilutive options, RSUs, and other contingently issuable shares	9,067,862			10,168,019
	Weighted average shares outstanding and common stock equivalents	131,430,701			125,552,041
	Diluted earnings per share	$	0.03		$	0.04
Schedule of securities excluded from the computation of diluted earnings per share because their effect would be anti-dilutive	'
		Three Months Ended March 31,
		2014		2013
	Stock options	16,844		69,476
	RSUs	286,014		6,135,867

SHAREBASED_COMPENSATION_Tables

SHARE-BASED COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2014
SHARE-BASED COMPENSATION	'
Summary of RSU transactions	'
		RSUs		Weighted-
				Average
				Grant Date
				Fair Value
	Outstanding December 31, 2013	18,483,001		$	4.01
	Granted	2,908,418		3.56
	Vested	(3,908,980	)	4.11
	Cancelled	(224,874	)	3.62
	Outstanding March 31, 2014	17,257,565		$	3.92
Schedule of total compensation expense and related income tax benefits recognized in relation to RSUs	'
		Three Months Ended March 31,
		2014			2013
	Compensation expense	$	7,356		$	8,142
	Income tax benefits	$	2,099		$	2,488
Stock options outstanding under the GFI Group 2002 Plan	'
		Options		Weighted
				Average
				Exercise
				Price
	Outstanding December 31, 2013	139,164		$	4.16
	Exercised	(20,212	)	2.97
	Cancelled	—		—
	Expired	(94,740	)	4.24
	Outstanding March 31, 2014	24,212		$	4.56

FAIR_VALUE_OF_FINANCIAL_INSTRU1

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2014
FAIR VALUE OF FINANCIAL INSTRUMENTS	'
Schedule of financial assets and liabilities measured at fair value on a recurring basis	'
		Quoted Prices in			Significant Other			Significant			Balance at
		Active Markets for			Observable			Unobservable			March 31,
		Identical Assets			Inputs			Inputs			2014
		(Level 1)			(Level 2)			(Level 3)
	Assets
	Other assets: Financial instruments owned:
	Equity securities	$	7		$	186		$	—		$	193
	Derivative contracts:
	Foreign exchange derivative contracts	$	112		$	630		$	—		$	742
	Fixed income derivative contracts	247			—			—			247
	Equity derivative contracts	—			—			—			—
	Netting (1)	(231		)	—			—			(231		)
	Total derivative contracts	$	128		$	630		$	—		$	758
	Total financial instruments owned	$	135		$	816		$	—		$	951
	Total	$	135		$	816		$	—		$	951
	Liabilities
	Other liabilities: Financial instruments sold, not yet purchased:
	Derivative contracts:
	Foreign exchange derivative contracts	$	4		$	675		$	—		$	679
	Fixed income derivative contracts	227			—			—			227
	Netting (1)		(231	)		—			—			(231	)
	Total derivative contracts	$	—		$	675		$	—		$	675
	Total financial instruments sold, not yet purchased	$	—		$	675		$	—		$	675
	Other liabilities: Contingent consideration	$	—		$	—		$	4,372		$	4,372
	Total	$	—		$	675		$	4,372		$	5,047
	(1)                                 Represents the impact of netting on a net-by-counterparty basis.
		Quoted Prices in			Significant Other			Significant			Balance at
		Active Markets for			Observable			Unobservable			December 31,
		Identical Assets			Inputs			Inputs			2013
		(Level 1)			(Level 2)			(Level 3)
	Assets
	Other assets: Financial instruments owned:
	Equity securities	$	546		$	177		$	—		$	723
	Derivative contracts:
	Foreign exchange derivative contracts	$	—		$	679		$	—		$	679
	Equity derivative contracts	—			—			14			14
	Total derivative contracts	$	—		$	679		$	14		$	693
	Total financial instruments owned	$	546		$	856		$	14		$	1,416
	Other assets: Other:
	Equity security, available-for-sale	$	5,465		$	—		$	—		$	5,465
	Total	$	6,011		$	856		$	14		$	6,881
	Liabilities
	Other liabilities: Financial instruments sold, not yet purchased:
	Derivative contracts:
	Foreign exchange derivative contracts	$	—		$	993		$	—		$	993
	Total financial instruments sold, not yet purchased	$	—		$	993		$	—		$	993
	Other liabilities: Contingent consideration	$	—		$	—		$	4,317		$	4,317
	Total	$	—		$	993		$	4,317		$	5,310
Schedule of changes in Level 3 financial assets and liabilities measured at fair value on a recurring basis	'
		Opening			Total realized			Unrealized gains			Purchases			Issues		Sales		Settlements			Closing		Unrealized
		Balance			and unrealized			included													Balance at		gains
					gains (losses)			in Other													March 31,		(losses) for Level
					included in			comprehensive													2014		3 Assets /
					Net income (1)			(income) loss															Liabilities
																							Outstanding at
																							March 31,
																							2014
	Assets
	Other assets:
	Financial instruments owned:
	Equity derivative contracts	$	14		$	(14	)	$	—		$	—		$	—	$	—	$	—		$	—	$	(14	)
	Liabilities
	Other liabilities:
	Contingent consideration:	$	4,317		$	28		$	27		$	—		$	—	$	—	$	—		$	4,372	$	28
	(1)                                     Realized and unrealized gains (losses) are reported in Other income, net in the Condensed Consolidated Statements of Operations.
		Opening			Total realized			Unrealized gains			Purchases			Issues		Sales		Settlements			Closing		Unrealized gains
		Balance			and unrealized			included													Balance at		(losses) for Level
					gains (losses)			in Other													March 31,		3 Assets /
					included in			comprehensive													2013		Liabilities
					Income (1)			(income) loss															Outstanding at
																							March 31,
																							2013
	Assets
	Other assets:
	Financial instruments owned:
	Equity derivative contracts	$	28		$	(22	)	$	—		$	—		$	—	$	—	$	—		$	6	$	(22	)
	Liabilities
	Other liabilities:
	Future purchase commitment:	$	3,209		$	744		$	208		$	—		$	—	$	—	$	—		$	2,257	$	744
	Other liabilities:
	Contingent consideration	$	518		$	—		$	—		$	—		$	—	$	—	$	(156	)	$	362	$	—
	(1)             Realized and unrealized gains (losses) are reported in Other income, net in the Condensed Consolidated Statements of Operations.
Schedule of significant unobservable inputs utilized by the company in the fair value measurement of Level 3 assets and liabilities measured at fair value on a recurring basis	'
		Fair Value as of			Valuation		Unobservable Input(s)		Range (Weighted
		March 31,			Technique(s)				Average) (a)
		2014
	Assets
	Equity derivative contracts	$	—		Black-Scholes Merton Model		Expected volatility		30	%
	Liabilities
	Contingent consideration	$	4,372		Present value of expected payments		Discount rate		17	%
							Forecasted financial information		(b)
		Fair Value as of			Valuation		Unobservable Input(s)		Range (Weighted
		December 31,			Technique(s)				Average) (a)
		2013
	Assets
	Equity derivative contracts	$	14		Black-Scholes Merton Model		Expected volatility		30	%
	Liabilities
	Contingent consideration	$	4,317		Present value of expected payments		Discount rate		17	%
							Forecasted financial information		(b)
	(a)         As of March 31, 2014 and December 31, 2013, each asset and liability type consists of one security.
	(b)         The Company’s estimate of contingent consideration as of March 31, 2014 and December 31, 2013, respectively, was principally based on the acquired business’ projected future financial performance, including revenues and operating margins from May 1, 2014 through April 30, 2015.

DERIVATIVE_FINANCIAL_INSTRUMEN1

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2014
DERIVATIVE FINANCIAL INSTRUMENTS	'
Schedule of fair values of derivative contracts on a gross and net basis	'
		March 31, 2014						December 31, 2013
	Derivatives not designated as hedging	Derivative			Derivative			Derivative			Derivative
	instruments under ASC 815-10	Assets(1)			Liabilities(2)			Assets(1)			Liabilities(2)
	Foreign exchange derivative contracts	$	986		$	867		$	679		$	993
	Commodity derivative contracts	29,974			29,886			17,604			17,216
	Fixed income derivative contracts	7,882			7,679			15,824			16,415
	Equity derivative contracts	22			25			24			15
	Total fair value of derivative contracts	$	38,864		$	38,457		$	34,131		$	34,639
	Counterparty netting	(37,782		)	(37,782		)	(33,050		)	(33,050		)
	Total fair value	$	1,082		$	675		$	1,081		$	1,589
	(1)                     Reflects futures and options on futures contracts within Receivables from brokers, dealers and clearing organizations and options and forwards contracts within Other assets.
	(2)                     Reflects futures and options on futures contracts within Payables to brokers, dealers and clearing organizations and options and forwards contracts within Other liabilities.
Schedule of outstanding long and short notional amounts on a gross basis of derivative financial instruments	'
		March 31, 2014						December 31, 2013
		Long			Short			Long			Short
	Foreign exchange derivative contracts	$	286		$	148,055		$	—		$	—
	Commodity derivative contracts	950,241			938,030			349,004			342,573
	Fixed income derivative contracts	9,890,091			10,191,069			9,415,546			10,047,771
	Equity derivative contracts	1,181			1,174			5,731			220
Summary of the effect of derivative contracts on the Consolidated Statements of Operations	'
		Location of Gain (Loss)		Amount of Gain (Loss) Recognized in Income on
				Derivatives
	Derivatives not designated as hedging	Recognized in Income on		For the Three Months			For the Three Months Ended
	instruments under ASC 815-10	Derivatives		Ended March 31, 2014			March 31, 2013
	Foreign exchange derivative contracts	-1		$	295		$	(791	)
	Commodity derivative contracts	Principal transactions		1,753			2,499
	Fixed income derivative contracts	Principal transactions		3,130			2,992
	Equity derivative contracts	-2		7			(297		)
	(1)         For the three months ended March 31, 2014, approximately $202 of gains on foreign exchange derivative contracts were included within Other income, net and approximately $93 of gains on foreign currency options were included within Principal transactions.  For the three months ended March 31, 2013, approximately $80 of losses on foreign exchange derivative contracts were included within Other income, net and approximately $711 of losses on foreign currency options were included within Principal transactions.
	(2)         For the three months ended March 31, 2014, approximately $14 of losses on equity derivative contracts were included within Other income, net and approximately $21 of gains on equity derivative contracts were included within Principal transactions. For the three months ended March 31, 2013, approximately $22 of losses on equity derivative contracts were included within Other income, net and approximately $275 of losses on equity derivative contracts were included within Principal transactions.
Summary of derivative contracts, by counterparty, including the gross amounts offset in the Condensed Consolidated Statements of Financial Position	'
	The following is a summary of derivative contracts, by counterparty, including the gross amounts offset in the Condensed   Consolidated Statements of Financial Position as of March 31, 2014:
								Net Amounts of
					Gross Amount			Assets Offset in the			Gross Amounts Not Offset in the
					Offset in the			Condensed			Condensed Consolidated Statements
		Gross			Condensed			Consolidated			of Financial Condition
		Amounts of			Consolidated			Statements of						Cash Collateral
		Recognized			Statements of			Financial Position						Received/
	Counterparties	Assets			Financial Position			-1			Derivatives (2)			(Pledged)		Net Amount
	Derivative Assets:
	Counterparty A	$	114		$	—		$	114		$	—		$	—	$	114
	Counterparty B	29,973			29,886			87			—			—		87
	Counterparty C	8,261			7,896			365			—			—		365
	Counterparty E	516			—			516			—			—		516
	Total	$	38,864		$	37,782		$	1,082		$	—		$	—	$	1,082
	Derivative Liabilities:
	Counterparty A	$	540		$	—		$	540		$	—		$	—	$	540
	Counterparty B	29,886			29,886			—			—			—		—
	Counterparty C	7,896			7,896			—			—			—		—
	Counterparty E	135			—			135			—			—		135
	Total	$	38,457		$	37,782		$	675		$	—		$	—	$	675
	(1)         The total reconciles to the aggregate of total derivative contracts in the fair value measurements table and the variation margin on exchange traded futures for the respective periods; both reflected in Note 12. Derivative assets and derivative liabilities are reflected within Other assets and Other Liabilities, respectively, with the exception of futures and options on futures contracts. Futures and options on futures contracts are included within Receivables from and Payables to brokers, dealers, and clearing organizations, as applicable.
	(2)         As of March 31, 2014, the Company does not have any derivative positions under a master netting agreement that are not netted.
	The following is a summary of derivative contracts, by counterparty, including the gross amounts offset in the Consolidated Statements of Financial Position as of December 31, 2013:
								Net Amounts of
					Gross Amounts			Assets Offset in the			Gross Amounts Not Offset in the
					Offset in the			Condensed			Condensed Consolidated Statements
					Condensed			Consolidated			of Financial Condition
		Gross Amounts of			Consolidated			Statements of						Cash Collateral
		Recognized			Statements of			Financial Position						Received/
	Counterparties	Assets			Financial Position			-1			Derivatives (2)			(Pledged)		Net Amount
	Derivative Assets:
	Counterparty A	$	268		$	—		$	268		$	—		$	—	$	268
	Counterparty B	17,604			17,216			388			—			—		388
	Counterparty C	15,834			15,834			—			—			—		—
	Counterparty D	14			—			14			—			—		14
	Counterparty E	411			—			411			—			—		411
	Total	$	34,131		$	33,050		$	1,081		$	—		$	—	$	1,081
	Derivative Liabilities:
	Counterparty A	$	834		$	—		$	834		$	—		$	—	$	834
	Counterparty B	17,216			17,216			—			—			—		—
	Counterparty C	16,430			15,834			596			—			—		596
	Counterparty E	159			—			159			—			—		159
	Total	$	34,639		$	33,050		$	1,589		$	—		$	—	$	1,589
	(1)         The total reconciles to the aggregate of total derivative contracts in the fair value measurements table and the variation margin on exchange traded futures for the respective periods; both reflected in Note 12.  Derivative assets and derivative liabilities are reflected within Other assets and Other Liabilities, respectively, with the exception of futures and options on futures contracts. Futures and options on futures contracts are included within Receivables from and Payables to brokers, dealers, and clearing organizations, as applicable.
	(2)         As of December 31, 2013, the Company does not have any derivative positions under a master netting agreement that are not netted.

REGULATORY_REQUIREMENTS_Tables

REGULATORY REQUIREMENTS (Tables)	3 Months Ended
	Mar. 31, 2014
REGULATORY REQUIREMENTS	'
Schedule of aggregate regulatory capital in individually regulated entities in its operating regions	'
	As of March 31, 2014, the Company had the following aggregate regulatory capital, in individually regulated entities, in each of its operating regions:
		Americas		EMEA		Asia
	Regulatory capital	$	26,367	$	144,528	$	31,620
	Minimum regulatory capital required	7,645		113,526		9,199
	Excess regulatory capital	$	18,722	$	31,002	$	22,421

SEGMENT_AND_GEOGRAPHIC_INFORMA1

SEGMENT AND GEOGRAPHIC INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2014
SEGMENT AND GEOGRAPHIC INFORMATION	'
Schedule of financial information for the Company's reportable segments	'
		Three Months Ended March 31, 2014
		Americas		EMEA		Asia		Clearing		All Other			Total
		Brokerage		Brokerage		Brokerage		and Backed
								Trading
	Total revenues	$	61,698	$	89,300	$	19,223	$	44,293	$	26,225		$	240,739
	Revenues, net of interest and transaction-based expenses	58,752		86,427		19,103		11,140		27,005			202,427
	Income (loss) before income taxes	14,342		28,704		5,632		931		(44,106		)	5,503
		Three Months Ended March 31, 2013
		Americas		EMEA		Asia		Clearing		All Other			Total
		Brokerage		Brokerage		Brokerage		and Backed
								Trading
	Total revenues	$	69,258	$	87,668	$	18,359	$	47,610	$	21,497		$	244,392
	Revenues, net of interest and transaction-based expenses	66,148		84,993		18,249		10,339		21,788			201,517
	Income (loss) before income taxes	19,394		26,037		4,822		610		(50,768		)	95
Schedule of geographic information regarding revenues and long-lived assets	'
		Three Months Ended
		March 31,
		2014		2013
	Revenues:
	United States	$	63,213	$	69,175
	United Kingdom	124,305		125,486
	Other	53,221		49,731
	Total	$	240,739	$	244,392
		Three Months Ended
		March 31,
		2014		2013
	Revenues, net of interest and transaction-based expenses:
	United States	$	62,096	$	67,431
	United Kingdom	89,819		87,187
	Other	50,512		46,899
	Total	$	202,427	$	201,517
		March 31,		December 31,
		2014		2013
	Long-lived Assets, as defined:
	United States	$	50,544	$	49,987
	United Kingdom	11,379		11,762
	Other	4,322		4,396
	Total	$	66,245	$	66,145

ORGANIZATION_AND_BUSINESS_Deta

ORGANIZATION AND BUSINESS (Details) (JPI)	Mar. 31, 2014
JPI	'
Organization and Business	'
Ownership by Jersey Partners, Inc. (as a percent)	37.00%

SUMMARY_OF_SIGNIFICANT_ACCOUNT2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
	item
Significant accounting policies	'	'	'
Number of VIEs in which the company is the primary beneficiary	1	'	'
Prepaid bonuses	$22,699	'	$23,499
Forgivable employee loans and advances to employees	22,448	'	24,109
Amortization of prepaid bonuses and forgivable employee loans	6,720	6,348	'
Carrying amount of equity method investments	31,358	'	36,976
Carrying amount of cost-method investments	4,614	'	5,087
Fair value of available-for-sale securities	0	'	5,465
Net losses resulting from remeasurement of foreign currency transactions and balances	92	273	'
Income tax expense (benefit)	$1,094	($4,859)	'
Federal statutory rate (as a percent)	35.00%	'	'
Minimum	'	'	'
Significant accounting policies	'	'	'
Amortization period of prepaid bonuses and forgivable loans	'2 years	'	'
Maximum	'	'	'
Significant accounting policies	'	'	'
Amortization period of prepaid bonuses and forgivable loans	'4 years	'	'
Software revenue | Minimum	'	'	'
Significant accounting policies	'	'	'
Period for recognition of deferred revenue	'1 year	'	'
Software revenue | Maximum	'	'	'
Significant accounting policies	'	'	'
Period for recognition of deferred revenue	'5 years	'	'
Analytics revenue	'	'	'
Significant accounting policies	'	'	'
Period for recognition of deferred revenue	'3 years	'	'
Market data subscription revenue | Minimum	'	'	'
Significant accounting policies	'	'	'
Period for recognition of deferred revenue	'1 year	'	'
Market data subscription revenue | Maximum	'	'	'
Significant accounting policies	'	'	'
Period for recognition of deferred revenue	'2 years	'	'
Property, equipment and leasehold improvements | Minimum	'	'	'
Significant accounting policies	'	'	'
Useful life	'3 years	'	'
Property, equipment and leasehold improvements | Maximum	'	'	'
Significant accounting policies	'	'	'
Useful life	'7 years	'	'
Computer software	'	'	'
Significant accounting policies	'	'	'
Useful life	'3 years	'	'

RECEIVABLES_FROM_AND_PAYABLES_2

RECEIVABLES FROM AND PAYABLES TO BROKERS, DEALERS AND CLEARING ORGANIZATIONS (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Receivables from brokers, dealers and clearing organizations:	'	'
Contract value of fails to deliver	$635,431	$123,470
Receivables from and deposits with clearing organizations and financial institutions	216,350	172,257
Total	851,781	295,727
Payables to brokers, dealers and clearing organizations:	'	'
Contract value of fails to receive	614,194	123,393
Payables to clearing organizations and financial institutions	21,963	3,052
Net pending trades	4,264	455
Total	$640,421	$126,900

RECEIVABLES_FROM_AND_PAYABLES_3

RECEIVABLES FROM AND PAYABLES TO BROKERS, DEALERS AND CLEARING ORGANIZATIONS (Details 2) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Cash payable to clearing customers	'	'
Payables to clearing services customers	$199,974	$177,523
Cash segregated under federal and other regulations	'	'
Cash payable to clearing customers	'	'
Payables to clearing services customers	62,895	62,684
Receivables from brokers, dealers, and clearing organizations	'	'
Cash payable to clearing customers	'	'
Payables to clearing services customers	$137,079	$114,839

GOODWILL_AND_INTANGIBLE_ASSETS2

GOODWILL AND INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended			3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
		Reportable segment	Reportable segment	Reportable segment	Reportable segment	All other
		Americas Brokerage	Americas Brokerage	EMEA Brokerage	Clearing and Backed Trading
Goodwill	'	'	'	'	'	'
Goodwill at the beginning of the period	$255,920	$83,289	$83,289	$14,637	$23,259	$134,735
Adjustments	-60	'	'	'	'	-60
Foreign currency translation	260	'	'	83	150	27
Goodwill at the end of the period	$256,120	$83,289	$83,289	$14,720	$23,409	$134,702

GOODWILL_AND_INTANGIBLE_ASSETS3

GOODWILL AND INTANGIBLE ASSETS (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Intangible Assets	'	'	'
Gross amount	$106,360	'	$106,360
Accumulated amortization and foreign currency translation	62,929	'	60,676
Net carrying value	43,431	'	45,684
Intangible amortization expense	2,469	2,498	'
Expected amortization expense for the definite lived intangible assets	'	'	'
2014 (remaining nine months)	7,277	'	'
2015	9,609	'	'
2016	7,693	'	'
2017	4,333	'	'
2018	3,510	'	'
Thereafter	11,009	'	'
Customer relationships	'	'	'
Intangible Assets	'	'	'
Gross amount	77,196	'	77,196
Accumulated amortization and foreign currency translation	44,000	'	42,151
Net carrying value	33,196	'	35,045
Trade names	'	'	'
Intangible Assets	'	'	'
Gross amount	8,951	'	8,951
Accumulated amortization and foreign currency translation	6,797	'	6,674
Net carrying value	2,154	'	2,277
Core technology	'	'	'
Intangible Assets	'	'	'
Gross amount	11,950	'	11,950
Accumulated amortization and foreign currency translation	6,411	'	6,285
Net carrying value	5,539	'	5,665
Non-compete agreements	'	'	'
Intangible Assets	'	'	'
Gross amount	3,865	'	3,865
Accumulated amortization and foreign currency translation	3,491	'	3,478
Net carrying value	374	'	387
Favorable lease agreements	'	'	'
Intangible Assets	'	'	'
Gross amount	620	'	620
Accumulated amortization and foreign currency translation	600	'	580
Net carrying value	20	'	40
Patents	'	'	'
Intangible Assets	'	'	'
Gross amount	3,131	'	3,131
Accumulated amortization and foreign currency translation	1,346	'	1,221
Net carrying value	1,785	'	1,910
Other	'	'	'
Intangible Assets	'	'	'
Gross amount	647	'	647
Accumulated amortization and foreign currency translation	284	'	287
Net carrying value	$363	'	$360

OTHER_ASSETS_AND_OTHER_LIABILI2

OTHER ASSETS AND OTHER LIABILITIES (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other assets	'	'
Deferred tax assets	$48,779	$45,694
Investments accounted for under the cost method and equity method	35,972	42,063
Prepaid bonuses	22,699	23,499
Forgivable employee loans and advances to employees	22,448	24,109
Deferred financing fees	6,332	6,786
Software inventory, net	4,422	4,749
Financial instruments owned	951	1,416
Other	26,184	29,528
Total Other assets	$167,787	$177,844

OTHER_ASSETS_AND_OTHER_LIABILI3

OTHER ASSETS AND OTHER LIABILITIES (Details 2) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Other liabilities	'	'
Payroll related liabilities	$31,007	$15,896
Deferred revenues	10,483	9,199
Unrecognized tax benefits	8,676	8,676
Deferred tax liabilities	6,440	6,835
Contingent consideration liabilities	4,372	4,317
Financial instruments sold, not yet purchased	675	993
Other	28,994	37,155
Total Other liabilities	$90,647	$83,071

SHORTTERM_BORROWINGS_AND_LONGT2

SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Details) (USD $)	0 Months Ended			1 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Jun. 26, 2013	Apr. 19, 2013	Jan. 18, 2013	Jul. 31, 2011	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 21, 2011
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'	'	'	'	'	'	'	'
Long-term debt	'	'	'	'	$240,000	$240,000	'	'
Loans pursuant to Credit Agreement	'	'	'	'	10,000	10,000	'	'
Total	'	'	'	'	250,000	250,000	'	'
Unamortized deferred financing fees	'	'	'	'	6,332	6,786	'	'
8.375% Senior Notes due 2018	'	'	'	'	'	'	'	'
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'	'	'	'	'	'	'	'
Long-term debt	'	'	'	'	240,000	240,000	'	'
Carrying Amount	'	'	'	'	240,000	240,000	'	'
Fair Value	'	'	'	'	257,400	251,100	'	'
Interest rate (as a percent)	'	'	'	8.38%	8.38%	'	'	'
Aggregate principal amount	'	'	'	250,000	'	'	'	'
Price of notes as percentage of principal amount	'	'	'	100.00%	'	'	'	'
Transaction costs	'	'	'	9,100	'	'	'	'
Aggregate principal amount of notes exchanged for notes registered under the Securities Act	'	'	'	'	'	'	'	250,000
Principal amount	'	'	'	'	'	'	10,000	'
Aggregate purchase price	'	'	'	'	'	'	9,602	'
Increase in per annum interest rate (as a percent)	0.25%	0.50%	0.50%	'	2.00%	'	'	'
Additional interest per annum	'	'	'	'	4,800	'	'	'
Unamortized deferred financing fees	'	'	'	'	5,357	5,669	'	'
Credit Agreement	'	'	'	'	'	'	'	'
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'	'	'	'	'	'	'	'
Maximum borrowings	'	'	'	'	75,000	'	75,000	'
Weighted average interest rate (as a percent)	'	'	'	'	3.41%	'	'	'
Unamortized deferred financing fees	'	'	'	'	975	1,117	'	'
Credit Agreement | Maturity by December 2013	'	'	'	'	'	'	'	'
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'	'	'	'	'	'	'	'
Maximum borrowings	'	'	'	'	'	'	18,750	'
Credit Agreement | Maturity by December 2015	'	'	'	'	'	'	'	'
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'	'	'	'	'	'	'	'
Maximum borrowings	'	'	'	'	'	'	56,250	'
Letters of credit	'	'	'	'	'	'	'	'
SHORT-TERM BORROWINGS AND LONG-TERM DEBT	'	'	'	'	'	'	'	'
Maximum borrowings	'	'	'	'	$50,000	'	'	'

STOCKHOLDERS_EQUITY_Details

STOCKHOLDERS' EQUITY (Details) (USD $)	0 Months Ended	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 28, 2014	Mar. 31, 2014
Cash dividend paid (in dollars per share)	$0.05	'
Total cash dividend paid	$6,188	$6,188

EARNINGS_PER_SHARE_Details

EARNINGS PER SHARE (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Basic earnings per share	'	'
GFI's net income	$4,003	$4,674
Weighted average common shares outstanding	122,362,839	115,384,022
Basic earnings per share (in dollars per share)	$0.03	$0.04
Diluted earnings per share	'	'
GFI's net income	$4,003	$4,674
Weighted average common shares outstanding	122,362,839	115,384,022
Effect of dilutive options, RSUs and other contingently issuable shares	9,067,862	10,168,019
Weighted average shares outstanding and common stock equivalents	131,430,701	125,552,041
Diluted earnings per share (in dollars per share)	$0.03	$0.04
LOSS PER SHARE	'	'
Contingently issuable shares excluded from computation of diluted loss per share as a result of net loss	1,171,879	3,682,916
RSUs	'	'
LOSS PER SHARE	'	'
Securities excluded from computation of diluted loss per share as a result of net loss (in shares)	286,014	6,135,867
Stock options	'	'
LOSS PER SHARE	'	'
Securities excluded from computation of diluted loss per share as a result of net loss (in shares)	16,844	69,476

SHAREBASED_COMPENSATION_Detail

SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Stock Options	'	'
Additional disclosures	'	'
Unrecognized compensation cost	$0	$0
2008 Equity Incentive Plan	'	'
SHARE-BASED COMPENSATION	'	'
Shares of common stock available for future grants of awards	7,272,045	'
2008 Equity Incentive Plan and 2004 Equity Incentive Plan | Restricted Stock Units	'	'
Restricted Stock Units	'	'
Outstanding at the beginning of the period (in shares)	18,483,001	'
Granted (in shares)	2,908,418	'
Vested (in shares)	-3,908,980	'
Cancelled (in shares)	-224,874	'
Outstanding at the end of the period (in shares)	17,257,565	'
Weighted-Average Grant Date Fair Value	'	'
Outstanding at the beginning of the period (in dollars per share)	$4.01	'
Granted (in dollars per share)	$3.56	$3.35
Vested (in dollars per share)	$4.11	'
Cancelled (in dollars per share)	$3.62	'
Outstanding at the end of the period (in dollars per share)	$3.92	'
Total compensation expense and related income tax benefits	'	'
Compensation expense	7,356	8,142
Income tax benefits	2,099	2,488
Total unrecognized compensation cost	51,663	'
Weighted average period over which unrecognized compensation cost is expected to be recognized	'1 year 9 months 14 days	'
Total fair value of shares vested	$16,057	$20,472
GFI Group 2002 Plan | Stock Options	'	'
Stock Options	'	'
Outstanding at the beginning of the period (in shares)	139,164	'
Exercised (in shares)	-20,212	'
Expired (in shares)	-94,740	'
Outstanding at the end of the period (in shares)	24,212	'
Weighted Average Exercise Price	'	'
Outstanding at the beginning of the period (in dollars per share)	$4.16	'
Exercised (in dollars per share)	$2.97	'
Expired (in dollars per share)	$4.24	'
Outstanding at the end of the period (in dollars per share)	$4.56	'

COMMITMENTS_AND_CONTINGENCIES_

COMMITMENTS AND CONTINGENCIES (Details) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Purchase Obligations	'
Other purchase commitments	$8,515
Other purchase commitments due within the next twelve months	4,493
Market data	'
Purchase Obligations	'
Total purchase commitments	26,603
Purchase commitments due within the next twelve months	18,807
Purchase commitments due between one to three years	7,796
Network upgrades	'
Purchase Obligations	'
Other purchase commitments	7,500
Hosting and software license agreements	'
Purchase Obligations	'
Other purchase commitments	$1,015

COMMITMENTS_AND_CONTINGENCIES_1

COMMITMENTS AND CONTINGENCIES (Details 2)	Mar. 31, 2014	Dec. 31, 2013	Nov. 14, 2013	Nov. 14, 2013
In Thousands, unless otherwise specified	USD ($)	USD ($)	Contigo Limited	Contigo Limited
			USD ($)	GBP (£)
Contingencies	'	'	'	'
Contingent consideration	$4,372	$4,317	$3,942	£ 2,458

FAIR_VALUE_OF_FINANCIAL_INSTRU2

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details)	Mar. 31, 2014	Nov. 14, 2013
	item	Contigo Limited
Valuation Techniques	'	'
Number of acquisitions with contingent consideration	1	'
Percentage of common stock	'	50.00%

FAIR_VALUE_OF_FINANCIAL_INSTRU3

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Other assets: Financial instruments owned	$951	$1,416
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	675	993
Other liabilities: Contingent consideration	4,372	4,317
Excluded portion	'	'
Liabilities	'	'
Margin on net long derivative contracts related to exchange traded futures included within receivables from brokers, dealers and clearing organizations	324	388
Margin on net short derivative contracts related to exchange traded futures included within payables to brokers, dealers and clearing organizations	'	596
Fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'
Assets	'	'
Other assets: Financial instruments owned	135	546
Other assets: Other:	'	'
Equity security, available-for-sale	'	5,465
Total	135	6,011
Fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities	'	'
Assets	'	'
Other assets: Financial instruments owned	7	546
Fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	128	'
Netting	-231	'
Liabilities	'	'
Netting	-231	'
Fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	112	'
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	4	'
Fair value measured on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	247	'
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	227	'
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2)	'	'
Assets	'	'
Other assets: Financial instruments owned	816	856
Other assets: Other:	'	'
Total	816	856
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	675	993
Total	675	993
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Equity securities	'	'
Assets	'	'
Other assets: Financial instruments owned	186	177
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	630	679
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	675	'
Fair value measured on a recurring basis | Significant Other Observable Inputs (Level 2) | Foreign exchange derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	630	679
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	675	993
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3)	'	'
Assets	'	'
Other assets: Financial instruments owned	'	14
Other assets: Other:	'	'
Total	'	14
Liabilities	'	'
Other liabilities: Contingent consideration	4,372	4,317
Total	4,372	4,317
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	'	14
Fair value measured on a recurring basis | Significant Unobservable Inputs (Level 3) | Equity derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	'	14
Other assets: Other:	'	'
Total	'	14
Fair value measured on a recurring basis | Total	'	'
Assets	'	'
Other assets: Financial instruments owned	951	1,416
Other assets: Other:	'	'
Equity security, available-for-sale	'	5,465
Total	951	6,881
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	675	993
Other liabilities: Contingent consideration	4,372	4,317
Total	5,047	5,310
Fair value measured on a recurring basis | Total | Equity securities	'	'
Assets	'	'
Other assets: Financial instruments owned	193	723
Fair value measured on a recurring basis | Total | Derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	758	693
Netting	-231	'
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	675	'
Netting	-231	'
Fair value measured on a recurring basis | Total | Foreign exchange derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	742	679
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	679	993
Fair value measured on a recurring basis | Total | Fixed income derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	247	'
Liabilities	'	'
Other liabilities: Financial instruments sold, not yet purchased	227	'
Fair value measured on a recurring basis | Total | Equity derivative contracts	'	'
Assets	'	'
Other assets: Financial instruments owned	'	$14

FAIR_VALUE_OF_FINANCIAL_INSTRU4

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) (Equity derivative contracts, Recurring basis, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Equity derivative contracts | Recurring basis	'	'
Changes in Level 3 Financial Assets measured at fair value	'	'
Opening Balance	$14	$28
Total realized and unrealized gains (losses) included in Net income	-14	-22
Closing Balance	'	6
Unrealized gains (losses) for Level 3 Assets outstanding at end of the period	($14)	($22)

FAIR_VALUE_OF_FINANCIAL_INSTRU5

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4) (Recurring basis, USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Future purchase commitment	'	'
Changes in Level 3 Financial Liabilities measured at fair value	'	'
Opening Balance	'	$3,209
Total realized and unrealized gains (losses) included in Net income	'	744
Unrealized gains included in Other Comprehensive (income) loss	'	208
Closing Balance	'	2,257
Unrealized gains (losses) for Level 3 Liabilities outstanding at end of the period	'	744
Contingent consideration	'	'
Changes in Level 3 Financial Liabilities measured at fair value	'	'
Opening Balance	4,317	518
Total realized and unrealized gains (losses) included in Net income	28	'
Unrealized gains included in Other Comprehensive (income) loss	27	'
Settlements	'	-156
Closing Balance	4,372	362
Unrealized gains (losses) for Level 3 Liabilities outstanding at end of the period	$28	'

FAIR_VALUE_OF_FINANCIAL_INSTRU6

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 5) (Fair value measured on a recurring basis, Significant Unobservable Inputs (Level 3), USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair value, Unobservable Input	'	'
Fair Value, Assets	'	14
Fair Value, Liabilities	4,372	4,317
Contingent consideration	'	'
Fair value, Unobservable Input	'	'
Fair Value, Liabilities	4,372	4,317
Contingent consideration | Present value of expected payments	'	'
Unobservable Input(s)	'	'
Discount rate (as a percent)	17.00%	17.00%
Equity derivative contracts	'	'
Fair value, Unobservable Input	'	'
Fair Value, Assets	'	14
Equity derivative contracts | Black-Scholes-Merton Model	'	'
Unobservable Input(s)	'	'
Expected volatility (as a percent)	30.00%	30.00%

DERIVATIVE_FINANCIAL_INSTRUMEN2

DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative Assets	'	'
Total fair value of derivative contracts	$38,864	$34,131
Counterparty netting	-37,782	-33,050
Total fair value	1,082	1,081
Derivative Liabilities	'	'
Total fair value of derivative contracts	38,457	34,639
Counterparty netting	-37,782	-33,050
Total fair value	675	1,589
Derivatives not designated as hedging instruments	'	'
Derivative Assets	'	'
Total fair value of derivative contracts	38,864	34,131
Counterparty netting	-37,782	-33,050
Total fair value	1,082	1,081
Derivative Liabilities	'	'
Total fair value of derivative contracts	38,457	34,639
Counterparty netting	-37,782	-33,050
Total fair value	675	1,589
Foreign exchange derivative contracts | Derivatives not designated as hedging instruments	'	'
Derivative Assets	'	'
Total fair value of derivative contracts	986	679
Derivative Liabilities	'	'
Total fair value of derivative contracts	867	993
Foreign exchange derivative contracts | Derivatives designated as hedging instruments	'	'
Derivative Liabilities	'	'
Notional value of derivative	91,537	86,170
Euro-denominated and Swiss franc-denominated balance sheet positions | Derivatives designated as hedging instruments	'	'
Derivative Liabilities	'	'
Notional value of derivative	33,432	27,659
Commodity derivative contracts | Derivatives not designated as hedging instruments	'	'
Derivative Assets	'	'
Total fair value of derivative contracts	29,974	17,604
Derivative Liabilities	'	'
Total fair value of derivative contracts	29,886	17,216
Fixed income derivative contracts | Derivatives not designated as hedging instruments	'	'
Derivative Assets	'	'
Total fair value of derivative contracts	7,882	15,824
Derivative Liabilities	'	'
Total fair value of derivative contracts	7,679	16,415
Equity derivative contracts | Derivatives not designated as hedging instruments	'	'
Derivative Assets	'	'
Total fair value of derivative contracts	22	24
Derivative Liabilities	'	'
Total fair value of derivative contracts	$25	$15

DERIVATIVE_FINANCIAL_INSTRUMEN3

DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Foreign exchange derivative contracts | Long	'	'
Notional amount of derivatives	'	'
Notional amount	$286	'
Foreign exchange derivative contracts | Short	'	'
Notional amount of derivatives	'	'
Notional amount	148,055	'
Commodity derivative contracts | Long	'	'
Notional amount of derivatives	'	'
Notional amount	950,241	349,004
Commodity derivative contracts | Short	'	'
Notional amount of derivatives	'	'
Notional amount	938,030	342,573
Fixed income derivative contracts | Long	'	'
Notional amount of derivatives	'	'
Notional amount	9,890,091	9,415,546
Fixed income derivative contracts | Short	'	'
Notional amount of derivatives	'	'
Notional amount	10,191,069	10,047,771
Equity derivative contracts | Long	'	'
Notional amount of derivatives	'	'
Notional amount	1,181	5,731
Equity derivative contracts | Short	'	'
Notional amount of derivatives	'	'
Notional amount	$1,174	$220

DERIVATIVE_FINANCIAL_INSTRUMEN4

DERIVATIVE FINANCIAL INSTRUMENTS (Details 3) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Foreign exchange derivative contracts | Principal transactions	'	'
Effect of derivative contracts on the Condensed Consolidated Statements	'	'
Amount of Gain (Loss) Recognized in Income on Derivatives	$93	($711)
Foreign exchange derivative contracts | Other income, net	'	'
Effect of derivative contracts on the Condensed Consolidated Statements	'	'
Amount of Gain (Loss) Recognized in Income on Derivatives	202	-80
Foreign exchange derivative contracts | Derivatives not designated as hedging instruments	'	'
Effect of derivative contracts on the Condensed Consolidated Statements	'	'
Amount of Gain (Loss) Recognized in Income on Derivatives	295	-791
Commodity derivative contracts | Derivatives not designated as hedging instruments | Principal transactions	'	'
Effect of derivative contracts on the Condensed Consolidated Statements	'	'
Amount of Gain (Loss) Recognized in Income on Derivatives	1,753	2,499
Fixed income derivative contracts | Derivatives not designated as hedging instruments | Principal transactions	'	'
Effect of derivative contracts on the Condensed Consolidated Statements	'	'
Amount of Gain (Loss) Recognized in Income on Derivatives	3,130	2,992
Equity derivative contracts | Principal transactions	'	'
Effect of derivative contracts on the Condensed Consolidated Statements	'	'
Amount of Gain (Loss) Recognized in Income on Derivatives	21	-275
Equity derivative contracts | Other income, net	'	'
Effect of derivative contracts on the Condensed Consolidated Statements	'	'
Amount of Gain (Loss) Recognized in Income on Derivatives	-14	-22
Equity derivative contracts | Derivatives not designated as hedging instruments	'	'
Effect of derivative contracts on the Condensed Consolidated Statements	'	'
Amount of Gain (Loss) Recognized in Income on Derivatives	$7	($297)

DERIVATIVE_FINANCIAL_INSTRUMEN5

DERIVATIVE FINANCIAL INSTRUMENTS (Details 4) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative Assets:	'	'
Gross Amounts of Recognized Assets	$38,864	$34,131
Gross Amounts Offset in the Condensed Consolidated Statements of Financial Position	37,782	33,050
Net Amounts of Assets Offset in the Condensed Consolidated Statements of Financial Position	1,082	1,081
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	1,082	1,081
Derivative Liabilities:	'	'
Gross Amounts of Recognized Liabilities	38,457	34,639
Gross Amounts Offset in the Condensed Consolidated Statements of Financial Position	37,782	33,050
Net Amounts of Liabilities Offset in the Condensed Consolidated Statements of Financial Position	675	1,589
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	675	1,589
Counterparty A	'	'
Derivative Assets:	'	'
Gross Amounts of Recognized Assets	114	268
Net Amounts of Assets Offset in the Condensed Consolidated Statements of Financial Position	114	268
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	114	268
Derivative Liabilities:	'	'
Gross Amounts of Recognized Liabilities	540	834
Net Amounts of Liabilities Offset in the Condensed Consolidated Statements of Financial Position	540	834
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	540	834
Counterparty B	'	'
Derivative Assets:	'	'
Gross Amounts of Recognized Assets	29,973	17,604
Gross Amounts Offset in the Condensed Consolidated Statements of Financial Position	29,886	17,216
Net Amounts of Assets Offset in the Condensed Consolidated Statements of Financial Position	87	388
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	87	388
Derivative Liabilities:	'	'
Gross Amounts of Recognized Liabilities	29,886	17,216
Gross Amounts Offset in the Condensed Consolidated Statements of Financial Position	29,886	17,216
Counterparty C	'	'
Derivative Assets:	'	'
Gross Amounts of Recognized Assets	8,261	15,834
Gross Amounts Offset in the Condensed Consolidated Statements of Financial Position	7,896	15,834
Net Amounts of Assets Offset in the Condensed Consolidated Statements of Financial Position	365	'
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	365	'
Derivative Liabilities:	'	'
Gross Amounts of Recognized Liabilities	7,896	16,430
Gross Amounts Offset in the Condensed Consolidated Statements of Financial Position	7,896	15,834
Net Amounts of Liabilities Offset in the Condensed Consolidated Statements of Financial Position	'	596
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	'	596
Counterparty D	'	'
Derivative Assets:	'	'
Gross Amounts of Recognized Assets	'	14
Net Amounts of Assets Offset in the Condensed Consolidated Statements of Financial Position	'	14
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	'	14
Counterparty E	'	'
Derivative Assets:	'	'
Gross Amounts of Recognized Assets	516	411
Net Amounts of Assets Offset in the Condensed Consolidated Statements of Financial Position	516	411
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	516	411
Derivative Liabilities:	'	'
Gross Amounts of Recognized Liabilities	135	159
Net Amounts of Liabilities Offset in the Condensed Consolidated Statements of Financial Position	135	159
Gross Amounts Not Offset in the Condensed Consolidated Statements of Financial Condition	$135	$159

VARIABLE_INTEREST_ENTITIES_Det

VARIABLE INTEREST ENTITIES (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Non-consolidated Variable Interest Entities | VIEs in the form of direct equity interests, a convertible note and a non-recourse loan	'	'
VARIABLE INTEREST ENTITIES	'	'
Carrying Amount of Assets	$3,654	$3,954
Maximum exposure to loss	4,823	4,592
Non-consolidated Variable Interest Entities | VIEs in the form of trading margin accounts	'	'
VARIABLE INTEREST ENTITIES	'	'
Carrying Amount of Assets	1,538	1,653
Maximum exposure to loss	1,538	1,653
Consolidated Variable Interest Entities	'	'
VARIABLE INTEREST ENTITIES	'	'
Total assets of consolidated VIE	10,413	8,953
Total liabilities of consolidated VIE	$3,289	$2,652

REGULATORY_REQUIREMENTS_Detail

REGULATORY REQUIREMENTS (Details) (USD $)	Mar. 31, 2014
In Thousands, unless otherwise specified
Americas	'
REGULATORY REQUIREMENTS	'
Regulatory capital	$26,367
Minimum regulatory capital required	7,645
Excess regulatory capital	18,722
EMEA	'
REGULATORY REQUIREMENTS	'
Regulatory capital	144,528
Minimum regulatory capital required	113,526
Excess regulatory capital	31,002
Asia	'
REGULATORY REQUIREMENTS	'
Regulatory capital	31,620
Minimum regulatory capital required	9,199
Excess regulatory capital	$22,421

SEGMENT_AND_GEOGRAPHIC_INFORMA2

SEGMENT AND GEOGRAPHIC INFORMATION (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
	item
SEGMENT AND GEOGRAPHIC INFORMATION	'	'
Number of reportable segments	4	'
Number of broad product categories	4	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'
Total revenues	$240,739	$244,392
Revenues, net of interest and transaction-based expenses	202,427	201,517
Income (loss) before income taxes	5,503	95
Reportable segment | Americas Brokerage	'	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'
Total revenues	61,698	69,258
Revenues, net of interest and transaction-based expenses	58,752	66,148
Income (loss) before income taxes	14,342	19,394
Reportable segment | EMEA Brokerage	'	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'
Total revenues	89,300	87,668
Revenues, net of interest and transaction-based expenses	86,427	84,993
Income (loss) before income taxes	28,704	26,037
Reportable segment | Asia Brokerage	'	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'
Total revenues	19,223	18,359
Revenues, net of interest and transaction-based expenses	19,103	18,249
Income (loss) before income taxes	5,632	4,822
Reportable segment | Clearing and Backed Trading	'	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'
Total revenues	44,293	47,610
Revenues, net of interest and transaction-based expenses	11,140	10,339
Income (loss) before income taxes	931	610
All other	'	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'
Total revenues	26,225	21,497
Revenues, net of interest and transaction-based expenses	27,005	21,788
Income (loss) before income taxes	($44,106)	($50,768)

SEGMENT_AND_GEOGRAPHIC_INFORMA3

SEGMENT AND GEOGRAPHIC INFORMATION (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
SEGMENT AND GEOGRAPHIC INFORMATION	'	'	'
Revenues:	$240,739	$244,392	'
Revenues, net of interest and transaction-based expenses:	202,427	201,517	'
Long-lived Assets, as defined:	66,245	'	66,145
United States	'	'	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'	'
Revenues:	63,213	69,175	'
Revenues, net of interest and transaction-based expenses:	62,096	67,431	'
Long-lived Assets, as defined:	50,544	'	49,987
United Kingdom	'	'	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'	'
Revenues:	124,305	125,486	'
Revenues, net of interest and transaction-based expenses:	89,819	87,187	'
Long-lived Assets, as defined:	11,379	'	11,762
Other	'	'	'
SEGMENT AND GEOGRAPHIC INFORMATION	'	'	'
Revenues:	53,221	49,731	'
Revenues, net of interest and transaction-based expenses:	50,512	46,899	'
Long-lived Assets, as defined:	$4,322	'	$4,396

SUBSEQUENT_EVENTS_Details

SUBSEQUENT EVENTS (Details) (Subsequent event, Dividend declared, USD $)	Apr. 30, 2014
Subsequent event | Dividend declared	'
SUBSEQUENT EVENTS	'
Cash dividend declared (in dollars per share)	$0.05