GAIN Capital 10-K17 Mar 142013 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Mar. 17, 2014	Jun. 28, 2013
Document Documentand Entity Information [Abstract]	'	'	'
Entity Registrant Name	'GAIN CAPITAL HOLDINGS, INC.	'	'
Trading Symbol	'GCAP	'	'
Entity Central Index Key	'0001444363	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Accelerated Filer	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Public Float	'	'	$99
Entity Common Stock, Shares Outstanding	'	39,762,579	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
ASSETS:	'	'
Cash and cash equivalents	$39,871	$36,820
Cash and securities held for customers	739,318	446,311
Short term investments, at fair value	788	1,437
Receivables from banks and brokers, net, ($9,784) and $968, respectively, at fair value	227,630	89,916
Property and equipment, net of accumulated depreciation	17,118	11,023
Prepaid assets	8,790	7,704
Goodwill	14,183	9,030
Intangible assets, net	34,828	9,868
Other assets, net	28,609	17,153
Total assets	1,111,135	629,262
Liabilities	'	'
Payables to customers, brokers, dealers, FCMs and other regulated entities	739,318	446,311
Accrued compensation and benefits	12,985	6,055
Accrued expenses and other liabilities	55,268	12,585
Income tax payable	3,803	1,481
Convertible senior notes	65,360	0
Total liabilities	876,734	466,432
Commitments and contingent liabilities (see Note 11)	'	'
GAIN Capital Holdings, Inc. Shareholders' equity	'	'
Common stock ($0.00001 par value; 60 million shares authorized; 41,921,609 shares issued and 39,425,434 shares outstanding as of December 31, 2013; 36,486,036 shares issued and 34,924,095 shares outstanding as of December 31, 2012)	0	0
Accumulated other comprehensive income	2,576	1,249
Additional paid-in capital	138,691	85,089
Treasury stock, at cost (2,496,175 shares at December 31, 2013 and 1,561,941 at December 31, 2012, respectively)	-15,469	-8,280
Retained earnings	108,603	84,772
Total GAIN Capital Holdings, Inc. Shareholders' equity	234,401	162,830
Total liabilities and shareholders' equity	$1,111,135	$629,262

Consolidated_Balance_Sheet_Par

Consolidated Balance Sheet (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]	'	'
Receivables from banks and brokers, Fair Value	($9,784)	$968
Common Stock, par value	$0.00	$0.00
Common Stock, shares authorized	60,000,000	60,000,000
Common Stock, shares issued	41,921,609	36,486,036
Common stock, shares outstanding	39,425,434	34,924,095
Treasury stock, shares	2,496,175	1,561,941

Consolidated_Statements_of_Ope

Consolidated Statements of Operations and Comprehensive Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
REVENUE:	'	'	'
Trading revenue	$205,133	$127,520	$175,854
Commission revenue	60,727	21,373	4,691
Other revenue	1,099	2,331	1,790
Total non-interest revenue	266,959	151,224	182,335
Interest revenue	821	627	544
Interest expense	1,389	491	1,414
Total net interest (expense) / revenue	-568	136	-870
Net revenue	266,391	151,360	181,465
EXPENSES:	'	'	'
Employee compensation and benefits	67,134	47,469	46,362
Selling and marketing	22,337	26,969	36,195
Trading expenses and commissions	77,718	38,047	33,040
General and administrative	26,813	19,865	21,842
Depreciation and amortization	7,768	4,921	3,898
Purchased intangible amortization	2,906	4,134	8,893
Communications and technology	11,315	7,736	7,139
Bad debt provision	1,501	358	852
Business Combination, Acquisition Related Costs	1,824	85	0
Restructuring	1,570	634	0
Integration	1,950	0	0
Impairment of investment	450	0	0
Total Operating Expense	223,286	150,218	158,221
OPERATING PROFIT	43,105	1,142	23,244
Gain on extinguishment of debt	2,000	0	0
INCOME BEFORE INCOME TAX EXPENSE	45,105	1,142	23,244
Income tax expense / (benefit)	13,794	-1,479	7,546
NET INCOME APPLICABLE TO GAIN CAPITAL HOLDINGS, INC.	31,311	2,621	15,698
Other comprehensive income, net of tax:	'	'	'
Foreign currency translation adjustment	1,327	933	-112
NET COMPREHENSIVE INCOME APPLICABLE TO GAIN CAPITAL HOLDINGS, INC.	$32,638	$3,554	$15,586
Earnings per common share:	'	'	'
Basic (usd per share)	$0.85	$0.08	$0.46
Diluted (usd per share)	$0.79	$0.07	$0.40
Weighted average common shares outstanding used in computing earnings per common share:	'	'	'
Basic (shares)	36,551,246	34,940,800	34,286,840
Diluted (shares)	39,632,878	37,880,208	38,981,792

Consolidated_Statement_of_Chan

Consolidated Statement of Changes in Shareholders' Equity (USD $)	Total	Common Stock	Treasury Stock	Additional Paid in Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Income/(loss)
In Thousands, except Share data, unless otherwise specified	USD ($)	Common Stock	USD ($)	USD ($)	USD ($)	USD ($)
BEGINNING BALANCE at Dec. 31, 2010	$148,992	'	'	$73,381	$75,183	$428
BEGINNING BALANCE (in shares) at Dec. 31, 2010	'	31,174,651	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Exercise of options (in shares)	'	452,881	'	'	'	'
Exercise of options	853	'	'	853	'	'
Exercise of warrants (in shares)	'	3,261,575	'	'	'	'
Exercise of warrants	1,270	'	'	1,270	'	'
Conversion of restricted stock into common stock (in shares)	'	214,800	'	'	'	'
Shares issued under employee stock purchase plan (in shares)	'	28,458	'	'	'	'
Shares issued under employee stock purchase plan	165	'	'	165	'	'
Repurchase of shares, (in shares)	'	-850,121	'	'	'	'
Repurchase of shares	-5,017	'	-5,017	'	'	'
Stock compensation expense	4,018	'	'	4,018	'	'
Tax benefit of stock options exercises	-136	'	'	-136	'	'
Dividend declared	-1,758	'	'	'	-1,758	'
Foreign currency translation adjustment	-112	'	'	'	'	-112
Net income	15,698	'	'	'	15,698	'
ENDING BALANCE at Dec. 31, 2011	163,973	'	-5,017	79,551	89,123	316
ENDING BALANCE (in shares) at Dec. 31, 2011	'	34,282,244	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Exercise of options (in shares)	'	1,032,096	'	'	'	'
Exercise of options	1,969	'	'	1,969	'	'
Conversion of restricted stock into common stock (in shares)	'	276,387	'	'	'	'
Shares issued under employee stock purchase plan (in shares)	'	45,188	'	'	'	'
Shares issued under employee stock purchase plan	216	'	'	216	'	'
Repurchase of shares, (in shares)	'	-711,820	'	'	'	'
Repurchase of shares	-3,263	'	-3,263	'	'	'
Stock compensation expense	3,325	'	'	3,325	'	'
Tax benefit of stock options exercises	28	'	'	28	'	'
Dividend declared	-6,972	'	'	'	-6,972	'
Foreign currency translation adjustment	933	'	'	'	'	933
Net income	2,621	'	'	'	2,621	'
ENDING BALANCE at Dec. 31, 2012	162,830	'	-8,280	85,089	84,772	1,249
ENDING BALANCE (in shares) at Dec. 31, 2012	'	34,924,095	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Exercise of options (in shares)	1,394,977	1,394,975	'	'	'	'
Exercise of options	2,539	'	'	2,539	'	'
Issuance of common stock (in shares)	'	3,625,721	'	'	'	'
Issuance of common stock	34,771	'	'	34,771	'	'
Conversion of restricted stock into common stock (in shares)	'	339,686	'	'	'	'
Shares issued under employee stock purchase plan (in shares)	'	75,191	'	'	'	'
Shares issued under employee stock purchase plan	302	'	'	302	'	'
Repurchase of shares, (in shares)	'	-934,234	'	'	'	'
Repurchase of shares	-7,189	'	-7,189	'	'	'
Stock compensation expense	2,896	'	'	2,896	'	'
Tax benefit of stock options exercises	1,026	'	'	1,026	'	'
Dividend declared	-7,326	'	'	'	-7,326	'
Foreign currency translation adjustment	1,327	'	'	'	'	1,327
Other	-233	'	'	-79	-154	'
Convertible note issuance	12,147	'	'	12,147	'	'
Net income	31,311	'	'	'	31,311	'
ENDING BALANCE at Dec. 31, 2013	$234,401	'	($15,469)	$138,691	$108,603	$2,576
ENDING BALANCE (in shares) at Dec. 31, 2013	'	39,425,434	'	'	'	'

Consolidated_Statement_of_Chan1

Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]	'	'	'	'	'	'	'
Dividend payment, per share	$0.05	$0.05	$0.05	$0.05	$0.20	$0.20	$0.05

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'	'
Net income	$31,311	$2,621	$15,698
Adjustments to reconcile net income to cash provided by operating activities	'	'	'
Loss/(gain) on foreign currency exchange rates	3,641	1,315	-145
Depreciation and amortization	11,837	9,055	12,791
Deferred taxes	39	-1,013	-2,107
Interest income	0	0	60
Amortization of deferred financing costs	0	51	87
Bad debt provision	1,501	358	852
Impairment of cost method investment	450	0	0
Convertible note discount amortization	175	0	0
Loss on disposal of fixed assets	0	33	3
(Gain/loss on extinguishment of debt	-2,000	0	0
Stock compensation expense	2,896	3,325	4,018
Changes in operating assets and liabilities:	'	'	'
Cash and securities held for customers	-74,608	-31,285	-53,617
Trading Securities	0	0	19,993
Receivables from banks and brokers	-78,336	-5,333	12,734
Prepaid assets	318	2,372	39
Other assets	-383	1,065	-5,428
Payables to customers, brokers, dealers, FCMs and other regulated entities	74,608	31,285	52,765
Accrued compensation and benefits	7,118	1,047	-151
Accrued expenses and other liabilities	973	-1,444	1,976
Income tax payable	2,131	-1,303	28
Cash (used for) / provided by operating activities	-18,329	12,149	59,596
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'	'
Purchases of property and equipment	-6,187	-8,358	-4,018
Purchases of Treasury Bills	0	-1,355	0
Sale of Treasury Bills	599	0	0
Purchase of intangible assets	0	0	-2,547
Purchase of cost method investment	0	0	-500
Cash used for investing activities	-9,807	-19,217	-7,065
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'	'
Contractual payments for acquired assets	-2,419	-2,030	-3,050
Proceeds from issuance of convertible senior note, net	77,900	0	0
Principal payment on notes payable	-31,200	-7,875	-10,500
Proceeds from exercise of stock options	2,539	1,969	853
Proceeds from exercise of warrants	0	0	1,270
Proceeds from employee stock purchase plan	302	216	165
Purchase of treasury stock	-7,189	-3,263	-5,017
Tax benefit from employee stock option exercises	1,026	-28	421
Dividend payment	-7,326	-6,972	-1,758
Cash provided by / (used for) financing activities	33,633	-17,983	-17,616
Effect of exchange rate changes on cash and cash equivalents	-2,446	1,650	-2,229
INCREASE / (DECREASE) IN CASH AND CASH EQUIVALENTS	3,051	-23,401	32,686
CASH AND CASH EQUIVALENTSbBeginning of period	36,820	60,221	27,535
CASH AND CASH EQUIVALENTSbEnd of period	39,871	36,820	60,221
SUPPLEMENTARY DISCLOSURES OF CASH FLOW INFORMATION:	'	'	'
Interest	-655	-230	-1,037
Taxes	-8,376	260	-14,090
Purchase of fixed assets in accrued expense and other liabilities	0	95	121
Senior loan issued by seller	33,200	0	0
OEC [Member]	'	'	'
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'	'
Acquisition and funding, net of cash acquired	0	-9,504	0
GFT [Member]	'	'	'
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'	'
Acquisition and funding, net of cash acquired	-4,219	0	0
SUPPLEMENTARY DISCLOSURES OF CASH FLOW INFORMATION:	'	'	'
Common stock issued as consideration for GFT	$34,771	$0	$0

Description_of_Business_and_Ba

Description of Business and Basis of Presentation	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	'
	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

	Description of Business

	GAIN Capital Holdings, Inc., together with its subsidiaries (the “Company”) is a Delaware corporation formed and incorporated on March 24, 2006. GAIN Holdings, LLC is a wholly-owned subsidiary of GAIN Capital Holdings, Inc., and it owns all outstanding membership units in GAIN Capital Group, LLC (“Group, LLC”), the primary regulated entity in the United States of America.
	Group, LLC is a retail foreign exchange dealer (“RFED”) and a registered Futures Commission Merchant (“FCM”) with the Commodity Futures Trading Commission (“CFTC”). As such, it is subject to the regulations of the CFTC, an agency of the U.S. Government, and the rules of the National Futures Association (“NFA”), an industry self-regulatory organization.

	GAIN Capital Forex.com UK Ltd. (“GCUK”) is registered in the UK and regulated by the Financial Services Authority
	(“FSA”) as a full scope €730k BIPRU Investment Firm.
	The following list includes each of the Company’s significant U.S. and international regulated subsidiaries:
	GAIN Capital Group, LLC
	GAIN Capital-Forex.com U.K., Ltd.
	Forex.com Japan Co., Ltd.
	GAIN Capital Forex.com Australia Pty. Ltd.
	GAIN Capital-Forex.com Hong Kong Ltd.
	GAIN Capital-Forex.com Canada, Ltd.
	GAIN GTX, LLC
	Global Futures & Forex, Ltd.
	GFT Global Markets UK Ltd.
	GFT Global Markets Asia Pte., Ltd.
	In September 2013, the Company purchased all of the outstanding share capital of Global Futures & Forex, Ltd., a Michigan corporation ("GFT"). See Note 5 "Acquisitions" for further details related to this acquisition.
	During 2012, the Company purchased all of the outstanding shares of capital stock of Paragon Futures Group, Inc., a Delaware corporation. Paragon owned all of the membership interests of Open E Cry, LLC (together “OEC”), an internet based futures business subject to the regulations of the CFTC. In November 2012, OEC was merged into Group, LLC. See Note 5 "Acquisitions" for further details related to this acquisition.

	Basis of Presentation and Principles of Consolidation

	In connection with the preparation of its Form 10-Q in the third quarter of 2013, the Company identified an error in the income tax provision and in the corresponding recognized tax assets and liabilities recorded in the year ended December 31, 2010. The Company considered guidance in ASC 250, including ASC 250-10-S99 SEC, formerly Staff Accounting Bulletin Release Topic 1.M, Materiality (“SAB 99”), and SEC Staff Accounting Bulletin Release Topic 1.N, Considering the Effect of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements (“SAB 108”), and concluded that the error did not constitute a material change to its previously issued consolidated financial statements. However, in order to accurately reflect the tax charge in the appropriate period, the Company has restated the Other assets, net, Income tax payable and Retained earnings balances as of December 31, 2012 to reflect the adjustment as if it had been made in the correct period.

	The table below describes the impact on the Consolidated Balance Sheet of the changes described above:


		As of December 31,
		Restated 2012		As reported 2012
	Other assets, net	17,153		17,804

	Income tax payable	1,481		1,275

	Retained earnings	84,772		85,629

	Previously, the Company presented certain acquisition expenses in "General and administrative". To provide greater transparency into these costs and enable easier comparison of operating performance, the Company has reclassified these costs to "Acquisition expense". The change in presentation has no effect on the total expenses.
	Consolidation
	The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and balances are eliminated in consolidation. The Company applies relevant accounting standards governing consolidations in determining its own principles of consolidation.

	Use of Estimates

	The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. In presenting the consolidated financial statements, management makes estimates regarding:

	•	Valuation of assets and liabilities requiring fair value estimates;

	•	The allowance for doubtful accounts;

	•	The realization of deferred taxes;

	•	The carrying amount of goodwill and other intangible assets;

	•	The amortization period of intangible assets and other long-lived assets with finite lives;

	•	Incentive based compensation accruals and valuation of share-based payment arrangements;

	•	Transfer pricing; and

	•	Other matters that affect the reported amounts and disclosure of contingencies in the consolidated financial statements.
	Estimates, by their nature, are based on judgment and available information. Therefore, actual results could differ from those estimates and could have a material impact on the consolidated financial statements, and it is possible that such changes could occur in the near term.
	Revenue Recognition
Revenue is recognized in accordance with revenue recognition guidance. The Company generates revenue from forex trading, metals trading, futures trading, Contracts-for-difference (“CFDs”) in markets which do not prohibit such transactions and other financial products. The Company categorizes revenue as Trading revenue, Commission revenue, Other revenue and Interest revenue.

Trading revenue is generated from the bid/offer spread the Company offers its customers and any net gains and losses generated through changes in the market value of the currencies and other products held in the Company’s net exposure.

Gains or losses are realized when customer transactions are liquidated. Unrealized gains or losses on trading positions are revalued at prevailing foreign currency exchange rates (the difference between contract price and market price) at the date of the balance sheet and are included in Receivables from banks and brokers as well as Payables to customers, brokers, dealers, FCMs and other regulated entities on the Consolidated Balance Sheets. Changes in net unrealized gains or losses are recorded in Trading revenue on the Consolidated Statements of Operations and Comprehensive Income.

The Company receives Commission revenue for customers' use of its platform or services, without taking any market or credit risk. Commission revenue is determined by the volume of trades. Commission revenue has historically been comprised of revenue from our GTX business, revenue from our futures business, and revenue from GAIN Securities, our securities business. In October 2013, GAIN Securities transferred substantially all of its customer accounts to TradeKing, LLC. Since we acquired GFT in September 2013, we have also realized commission revenue from the sales trader business acquired from GFT. Our sales traders offer high-touch trading services to high net worth individuals.

Other revenue, on the Consolidated Statements of Operations and Comprehensive Income, is comprised of account management, transaction, and performance fees related to customers who have assigned trading authority to the Company’s subsidiary Gain Capital Asset Management, (“GCAM”); inactivity and training fees charged to customer accounts; foreign currency transaction gains and losses and other miscellaneous items from each of our businesses.

Interest revenue and interest expense are recorded when earned and incurred, respectively. Net interest (expense) revenue consists primarily of the revenue generated by Company cash and customer cash held and invested at banks, money market funds, in U.S. treasury bills, in Canadian Imperial Bank of Commerce (“CIBC”) treasury bills and on deposit as collateral with the Company’s wholesale forex trading partners, less interest paid to customers on their balances, interest expense on our term loan and revolver, interest expense on the amounts payable to dbFX per the terms of the asset acquisition and interest expense on our convertible senior notes.
Selling and marketing
Selling and marketing costs are incurred for the production and communication of advertising, as well as other marketing activities. The total amount charged to selling and marketing was $22.3 million, $27.0 million and $36.2 million for the years ended December 31 2013, 2012 and 2011, respectively.
Restructuring expenses
In 2013 and 2012, the Company incurred restructuring expenses, which reflected costs arising from headcount reductions and other exit costs, measured and disclosed in accordance with relevant accounting guidance.

Acquisition expenses

In 2013 and 2012, the Company incurred acquisition related expenses, which included non-recurring costs, such as legal, accounting, valuation and other costs specified in accounting guidance. These costs are expensed as incurred.

Integration expenses

In 2013, the Company incurred integration expenses, which are non-recurring acquisition related costs that do not meet the definition of acquisition costs specified in accounting guidance. These costs include incentive payments to employees to remain through the acquisition, as well as accelerated amortization of assets due to the consolidation of trading platforms, resulting from the GFT acquisition.

Impairment of investment

In 2013, the Company’s investment in Kapitall, Inc., a cost basis minority interest originating in 2011, became impaired.

Gain on extinguishment of debt

The Company settled its GFT acquisition financing for less than the principal amount, in exchange for early payment. The difference between the principal and payment constituted Gain on extinguishment of debt.

Cash and cash equivalents
The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of acquisition to be cash equivalents. At December 31, 2013 and 2012, the Company’s cash and cash equivalents consisted of money market accounts and U.S. Treasury Bills with a maturity of 90 days or less. Cash equivalents are recorded at fair value.
Cash and securities held for customers
Cash and securities held for customers represents cash held to fund customer liabilities in connection with trading positions. Included in this balance are funds deposited by customers and funds accruing to customers as a result of trades or contracts. The Company records a corresponding liability in connection with this amount in Payables to customers, brokers, dealers, FCMs and other regulated entities. A portion of the balance is not available for general use due to legal restrictions in accordance with certain jurisdictional regulatory requirements.
Short Term Investments
The Company considers all investments with an original maturity of less than one year short term investments. Short term investments consist of short-term certificates of deposit and CIBC treasury bills. All income from the certificates of deposit and treasury bills is recorded as interest income when earned.
Cost Method Investment
In accordance with ASC 325-20, Cost Method Investments, the Company recognizes an investment in the stock of an investee as an asset, in Other assets, on the Consolidated Balance Sheets. Under the cost method of accounting for investments in common stock, dividends are the basis for recognition by the Company of earnings from the investment. The net accumulated earnings of an investee subsequent to the date of investment are recognized by the Company only to the extent distributed by the investee as dividends. Dividends received in excess of earnings subsequent to the date of investment are considered a return of investment and are recorded as reductions of cost of the investment.

Fair Value
The carrying amounts of assets, excluding goodwill and intangibles, and liabilities approximate their fair values due to the short term maturities. Some of the Company’s financial instruments are not measured at fair value on a recurring basis but nevertheless are recorded at amounts that approximate fair value. Such financial assets and liabilities include: cash, receivables from banks and brokers, other assets, payables to brokers, dealers, FCMs and other regulated entities, payables to customers and accrued expenses and other liabilities. These receivables and payables include open trading positions, hedging and customer respectively, which change in value as the price of the underlying product changes. The prices approximate the amounts at which the Company can settle the positions at the balance sheet date. The fair value of the convertible senior notes incorporates the unamortized discount and is assessed against prevailing interest rates.
Concentrations of Credit Risk
Financial instruments that subject the Company to credit risk primarily consist of cash equivalents. The Company’s credit risk is managed by investing cash and cash equivalents primarily in high-quality money market and U.S. and Canadian Government instruments. The majority of the Company’s cash and cash equivalents are held at ten financial institutions.
The Company also has credit risk related to receivables from banks and brokers. As of December 31, 2013 and 2012, 20% and 52%, respectively, of the Company’s Receivables from banks and brokers balance, included in the Consolidated Balance Sheet, was from one large, global financial institution.
Receivables from Banks and Brokers
The Company has posted funds with brokers as collateral as required by agreements for holding hedging positions. In addition, the Company has cash in excess of required collateral. These amounts are reflected as Receivables from banks and brokers on the Consolidated Balance Sheet and include gains or losses realized on liquidated contracts, as well as unrealized gains or losses on open positions.
Property and Equipment
Property and equipment are recorded at cost, net of accumulated depreciation. Identifiable significant improvements are capitalized and expenditures for maintenance and repairs are charged to expense as incurred.
Property and equipment are depreciated on a straight-line basis over the estimated useful lives of the assets as follows:



Software	3 years
Computer equipment	3 years
Furniture and fixtures	3 years
Leasehold improvements	Shorter of lease term or estimated useful life
Telephone equipment	3 years
Office equipment	3 years
Website development	3 years
The Company accounts for costs incurred to develop its trading platform and related software in accordance with ASC 350-40, Intangible-Goodwill and Other-Internal-Use Software. ASC 350-40 requires that such technology be capitalized in the application and infrastructure development stages. Costs related to training, administration and non-value-added maintenance are charged to expense as incurred. Capitalized software development costs are being amortized over the useful life of the software, which the Company has estimated at three years.
Long-Lived Assets
In accordance with ASC 360-10, Property, Plant and Equipment, the Company periodically evaluates the carrying value of long-lived assets when events and circumstances warrant such review. The carrying value of a long-lived asset is considered impaired when the anticipated undiscounted cash flow from such an asset is separately identifiable and is less than the carrying value. In that event, a loss is recognized in the amount by which the carrying value exceeds the fair market value of the long-lived asset. The Company has identified no such impairment losses.
*Foreign Currencies*
Items included in the financial statements of each of the Company's entities are measured using the currency of the primary environment in which the entity operates ("the functional currency"). The Company has determined that its functional currency is U.S. dollars (“USD”). The Company’s Accumulated other comprehensive income, consists of foreign currency translation adjustments from subsidiaries not using the U.S. dollar as their functional currency.
Foreign currency transactions are translated into functional currency using the exchange rates prevailing at the dates of the of the transactions. Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation at year end exchange rates of monetary assets and liabilities denominated in foreign currencies are recognized in Other revenue on the Consolidated Statements of Operations and Comprehensive Income. The Company recorded a loss of $3.6 million for the year ended December 31, 2013, a loss of $1.3 million for the year ended December 31, 2012 and a gain of $0.2 million for the year ended December 31, 2011.
Intangible Assets
Accounting guidance addressing intangible assets requires purchased intangible assets other than goodwill to be amortized over their useful lives unless their lives are determined to be indefinite. If the assets are determined to have a finite life in the future, the Company will amortize the carrying value over the remaining useful life at that time.
The Company compares the recorded value of its indefinite lived intangible assets to their fair value on an annual basis and whenever circumstances arise that indicate that an impairment may have occurred. This qualitative assessment indicated that it is more likely than not that our indefinite lived intangible assets are not impaired. See Note 3 for additional information.
Goodwill
In accordance with relevant guidance, the Company tests goodwill for impairment on an annual basis during the fourth quarter and on an interim basis when conditions indicate impairment has occurred. Goodwill impairment is determined by comparing the estimated fair value of the reporting unit with its respective book value. At the date of the latest test, in the fourth quarter of 2013, the fair value of the reporting unit was significantly in excess of its book value. See Note 3 for additional information.
Other Assets
The Company recorded receivables from vendors, security deposits, current and deferred tax assets and miscellaneous receivables in Other assets on the Consolidated Balance Sheets. See Note 3 for additional information.
Derivatives
Forex, metals, and CFDs allow for exchanging the difference in value of a particular asset such as stock index, energy product, or gold contracts, between the time at which a contract is opened and the time at which it is closed. The company's retail customer open positions are considered derivatives under derivatives accounting guidance. Therefore, they are accounted for at fair value, as included in Receivables from banks and brokers and Payables to customers, brokers, dealers, FCMs and other regulated entities in the consolidated balance sheets.


Allowance for Doubtful Accounts
The Company records an increase in the allowance for doubtful accounts when the prospect of collecting a specific customer account balance becomes doubtful. Management specifically analyzes accounts receivable and historical bad debt experience when evaluating the adequacy of the allowance for doubtful accounts. Should any of these factors change, the estimates made by management will also change, which could affect the level of the Company’s future provision for doubtful accounts. The customer receivables, net of allowance for doubtful accounts, is included in Other assets on the Consolidated Balance Sheets. Receivables from customers are reserved for and recorded in Bad debt provision on the Consolidated Statements of Operations and Comprehensive Income. The allowance for doubtful accounts consisted of the following (amounts in thousands):


Balance as of January 1, 2011	$	(74	)
Addition to provision	(852		)
Amounts written off	871

Balance as of December 31, 2011	(55		)
Addition to provision	(358		)
Amounts written off	265

Balance as of December 31, 2012	(148		)
Addition to provision	(1,501		)
Amounts written off	491

Balance as of December 31, 2013	$	(1,158	)
Payables to Customers, Brokers, Dealers, FCMs and Other Regulated Entities
Payables to customers, brokers, dealers, FCM's and other regulated entities, included on the Consolidated Balance Sheets, include amounts due on cash and margin transactions. These transactions include deposits, commissions and gains or losses arising from settled trades. The Payables to customers balance also reflects unrealized gains or losses arising from open positions in customer accounts. The Company engages in white label, or omnibus relationships, with other regulated financial institutions. The payables balance includes amounts deposited by these financial institutions in order for the Company to act as clearing broker. The payables balance includes deposits from all NFA registered entities.
Introducing broker fees
Introducing brokers direct customers to the Company in return for a commission on each referred customer’s trading volume or a share of net revenue generated by each referred customer’s trading activity. Such fees are referred to as introducing broker fees and are recorded in Trading expenses and commissions in the Consolidated Statements of Operations and Comprehensive Income.
Income Taxes
Income tax expense is provided for using the asset and liability method, under which deferred tax assets and liabilities are determined based upon the temporary differences between the financial statement and income tax bases of assets and liabilities using currently enacted tax rates. The Company operates a permanent reinvestment strategy, under which earnings derived from foreign business remain invested in the Company’s foreign subsidiaries. In accordance with ASC 740, the Company does not recognize domestic tax expense related to the permanently reinvested earnings. The Company has no plans to repatriate these earnings.
Share Based Payment
In accordance with stock compensation guidance, the Company recognizes expense for all share-based payments to employees, including grants of employee stock options as well as restricted stock units, in the Statements of Operations and Comprehensive Income based on their fair values. The Company estimates fair value using the Black Scholes model for stock options and market value on grant date for restricted stock units. For each type of award, the Company reduces expense by an estimated forfeiture rate. See Note 8 for additional share based payment disclosure.
Treasury Shares
In accordance with ASC 505-30, Equity - Treasury Stock, the Company treats the cost of acquired shares purchased as a deduction from shareholders’ equity and as a reduction of the total shares outstanding when calculating adjusted earnings per share.
Earnings Per Common Share
Basic earnings per common share is calculated using the weighted average common shares outstanding during the year. Common equivalent shares from stock options and restricted stock awards, using the treasury stock method, are also included in the diluted per share calculations unless their effect of inclusion would be anti-dilutive.
Risk Management
The Company offers its customers access to a diverse range of over 12,500 financial products, including foreign exchange, or forex, precious metals, “contracts for difference”, or CFDs, which are investment products with returns linked to the performance of underlying commodities, indices, individual equities, bonds and interest rate products, OTC options on forex, as well as futures and options on futures on more than 30 global exchange. In the United Kingdom, we also offer spread bets, which are investment products similar to CFDs, but that offer more favorable tax treatment for residents of that country. The Company actively trades currencies in the spot market, earning a dealer spread. The Company seeks to manage its market risk by generally entering into offsetting contracts in the interbank market, also on a margin basis. The Company deposits margin collateral with large money center banks and other major financial institutions. The Company is subject to credit risk or loss from counterparty nonperformance. The Company seeks to control the risks associated with its customers’ activities by requiring its customers to maintain margin collateral. The Company's trading platform does not allow customers to enter into trades if sufficient margin collateral is not on deposit with the Company.
The Company developed risk-management systems and procedures that allow it to manage the market and credit risk associated with managed flow activities in real-time. The Company does not actively initiate directional market positions in anticipation of future movements in the relative prices of currencies and evaluates market risk exposure on a continuous basis. As a result of the Company’s hedging activities, the Company is likely to have open positions in various currencies at any given time. An additional component of the risk-management approach is that levels of capital are maintained in excess of those required under applicable regulations. The Company also maintains liquidity relationships with three established, global prime brokers and at least six other wholesale trading partners, providing the Company with access to a liquidity pool.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	12 Months Ended
Recent Accounting Pronouncements	Dec. 31, 2013
Accounting Changes and Error Corrections [Abstract]	'
RECENT ACCOUNTING PRONOUNCEMENTS	'
	RECENT ACCOUNTING PRONOUNCEMENTS

	In July 2013, the Financial Accounting Standards Board, ("FASB") issued Accounting Standards Update (“ASU”) No. 2013-11, Income Taxes (Topic 740): 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 requires presenting unrecognized tax benefits netted against deferred tax assets, if such assets are sufficient and expected to replace cash payment, should an uncertain tax position not be sustained. This update is effective for annual periods beginning after December 15, 2013, and interim periods within those annual periods. Entities may choose to apply this update retrospectively. Management has not adopted this update early and continues to evaluate its potential effect on the Company's consolidated financial statements in advance of the effective date.

	In February 2013, the FASB issued ASU No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. This guidance requires an entity to present information about significant items reclassified out of Accumulated Other Comprehensive Income (AOCI) by component. For items reclassified out of AOCI and into net income, an entity must disclose the effect of such items on the affected line item. ASU No. 2013-02 is effective for annual periods beginning after December 15, 2012 and interim periods within those annual periods. It must be applied retrospectively. The adoption of ASU 2013-02 had no impact on the Company's consolidated financial statements.

	In December 2011, the FASB issued ASU 2011-11 Balance Sheet: Disclosures about Offsetting Assets and Liabilities. The new disclosure requirements mandate that entities disclose, in the consolidated balance sheet, both gross and net information about instruments and transactions eligible for offset, as well as instruments and transactions subject to an agreement similar to a master netting arrangement. In addition, the standard requires disclosure of collateral received and posted in connection with master netting agreements or similar arrangements. This ASU is effective for fiscal years, and interim periods within those years, beginning on or after January 1, 2013. In January 2013, the FASB issued ASU 2013-01 Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities. This update addresses implementation issues related to ASU 2011-11. The adoption of ASU 2011-11 and ASU 2013-01 had no impact on the Company’s consolidated statement of operations and comprehensive income or its consolidated balance sheet.

Additional_Financial_Informati

Additional Financial Information	12 Months Ended
	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
ADDITIONAL FINANCIAL INFORMATION	'
	ADDITIONAL FINANCIAL INFORMATION
	Fair Value Measurement
	The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis during the period and the related hierarchy levels (amounts in thousands):



		Fair Value Measurements on a Recurring Basis
		as of December 31, 2013
		Level 1				Level 2				Level 3				Total
	Financial Assets/(Liabilities):
	Money market accounts	$	21,019			$	—			$	—			$	21,019

	Open contracts and other positions	—				(9,904		)		—				(9,904		)

	CIBC treasury bills	706				—				—				706

	Certificates of deposit	82				—				—				82

	Investment in gold	120				—				—				120

	Customer and broker open contracts and other positions	—				129,224				—				129,224

	Total	$	21,927			$	119,320			$	—			$	141,247




		Fair Value Measurements on a Recurring Basis
		as of December 31, 2012
		Level 1				Level 2				Level 3				Total
	Financial Assets:
	Money market accounts	$	12,064			$	—			$	—			$	12,064

	Open contracts and other positions	810				—				—				810

	U.S. treasury bills	29,998				—				—				29,998

	CIBC treasury bills	1,355				—				—				1,355

	Certificates of deposit	82				—				—				82

	Investment in gold	168				—				—				168

	Customer and broker open contracts and other positions	74,943				—				—				74,943

	Total	$	119,420			$	—			$	—			$	119,420

	The Company has not changed its valuation techniques in measuring the fair value of any financial assets and liabilities during the period. The Company has included Open contracts and other positions and Customer and broker open contracts and other positions as Level 2 as of December 31, 2013 as these represent the fair value of the derivative contracts which are indexed to securities and commodities with quoted prices in active markets.
	Level 1 Financial Assets
	The Company has money market accounts, certificates of deposit, CIBC treasury bills and an investment in gold that are Level 1 financial instruments that are recorded based upon listed or quoted market rates. The money market accounts are recorded in Cash and cash equivalents and Cash and securities held for customers, the treasury bills are recorded in Cash and cash equivalents and Short term investments, based upon their maturity, the certificates of deposit are recorded in Short term investments and the investment in gold is recorded in Receivables from banks and brokers.
	Level 2 Financial Assets and Liabilities
	The Company has open contracts and other positions that are Level 2 financial instruments that are recorded in Receivables from banks and brokers.
	The Company has customer and broker open contracts and other positions that are Level 2 financial instruments that are recorded in Payable to customers, brokers, dealers, FCMs and other regulated entities.
	These Level 2 financial instruments are based upon directly observable values for underlying instruments.
	Financial Instruments Not Measured at Fair Value
	The table below presents the carrying value, fair value, and fair value hierarchy category of certain financial instruments that are not measured at fair value in the Consolidated Balance Sheet (amounts in thousands). The carrying value of Receivables from banks and brokers not measured at fair value approximates fair value because of the relatively short period of time between their origination and expected maturity. The carrying value of Payables to customers, brokers, dealers, FCMs, and other regulated entities includes amounts deposited by these financial institutions in order for the Company to act as a clearing broker. The carrying value of Payables to customers, brokers, dealers, FCMs, and other regulated entities includes cash and open margin positions. The open positions are based on observable market prices. The carrying value of Convertible senior note represents the notes’ principal amounts net of unamortized discount (see note 7). We assessed the notes' fair value against prevailing interest rates as of the balance sheet date. The carrying value of Accrued expense and other liabilities includes $20.0 million, referred to as the Holdback Amount, to be paid net of an amount required to settle certain liabilities of GFT after the closing date of the acquisition (see note 3). The carrying values of Accrued expense and other liabilities not measured at fair value approximate fair value because of the relatively short period of time between their origination and expected settlement date.

	In April 2011, the Company acquired customer account balances and effective customer agreements from Deutsche Bank AG, relating to Deutsche Bank’s “dbFX” business, for an upfront payment and additional contractual future payments to be made to Deutsche Bank based upon volume generated from the acquired customers over a two-year period following the closing of the acquisition. In accordance with ASC 835-30, Interest, the Company accounted for the payments due to dbFX as a note payable. As such, the total payments due to dbFX under the agreement were discounted to their present value using an imputed rate of interest. This liability was settled during July 2013.



		As of December 31, 2013								Fair Value Measurements using:
		Carrying Value				Fair Value				Quoted Prices			Significant				Significant
in Active										Observable			Unobservable
Markets for										Inputs			Inputs
Identical Assets										(Level 2)			(Level 3)
(Level 1)
Financial Assets:
Receivables from banks and brokers		$	237,414			$	237,414			—				$	237,414			—

Financial Liabilities:
Payables to customers, brokers, dealers, FCMs and other regulated entities	868,542				868,542				—			868,542				—

Convertible senior notes	$	65,360			$	64,372						$	64,372

Accrued expense and other liabilities	$	20,000			$	20,000						$	20,000


	As of December 31, 2012								Fair Value Measurements using:
	Carrying Value				Fair Value				Quoted Prices			Significant				Significant
									in Active			Observable				Unobservable
									Markets for			Inputs				Inputs
									Identical Assets			(Level 2)				(Level 3)
									(Level 1)
Financial Assets:
Receivables from banks and brokers	$	88,938			$	88,938			—			$	88,938			—

Financial Liabilities:
Payables to customers, brokers, dealers, FCMs and other regulated entities	$	371,368			$	371,368			—			$	371,368			—

Payable to dbFX	$	2,386			$	2,392			—			—				$	2,392

The Company’s investment in Kapitall, Inc., recorded in Other assets, is carried at cost, less impairment. The Company recognized an impairment of $0.5 million in the current year. The carrying value of the investment at December 31, 2013 was $0.1 million.
Receivables from Banks and Brokers
Amounts receivable from banks and brokers consisted of the following as of (amounts in thousands):


	31-Dec-13				31-Dec-12
Required collateral	$	148,731			$	47,595

Excess from futures broker - Restricted	4,575				—

Cash in excess of required collateral	84,108				41,343

Open positions	(9,904		)		810

Investment in spot gold	120				168

	$	227,630			$	89,916

The Company has posted funds with banks and brokers as collateral required by agreements for holding trading positions. In addition, the Company has deposited with such banks and brokers cash in excess of required collateral. These amounts are reflected as Receivables from banks and brokers on the Consolidated Balance Sheets.
Derivatives
The Company's contracts with its customers and its liquidity providers are deemed to be derivative instruments. The table below represents the fair values of the Company’s derivative instruments reported within Receivables from banks and brokers and Payables to customers, brokers, dealers, FCMs and other regulated entities on the accompanying Consolidated Balance Sheet (amounts in thousands):



	December 31, 2013
	Gross amounts of				Gross amount of				Net amounts of
	assets for				liabilities for				assets/liabilities
	derivative open				derivative open				for derivative
	positions at fair				positions at fair				open positions at
	value				value				fair value
Derivative Instruments:
Foreign currency exchange contracts	$	152,326			$	47,631			$	104,695

CFD contracts	50,169				45,735				4,434

Metals contracts	16,485				6,294				10,190

Total	$	218,980			$	99,660			$	119,320


	December 31, 2013
	Cash Collateral				Net amounts of				Net amounts of
					assets/liabilities				assets/liabilities
					for derivative				presented in the
					open positions at				balance sheet
					fair value
Derivative Assets/Liabilities:
Receivables from bank and brokers	$	237,414			$	(9,904	)		$	227,630

Payables to customers, brokers, dealers, FCMs and other regulated entities	$	868,542			$	129,224			$	739,318

The Company’s derivatives include different underlyings, which vary in price. Foreign exchange contracts typically have prices less than two dollars, while certain metals contracts and contracts for difference can be considerably higher priced. The table below represents the notional values of the Company’s derivative instruments reported within Receivables from banks and brokers and Payables to customers, brokers, dealers, FCMs and other regulated entities on the accompanying Consolidated Balance Sheet (amounts in thousands):


	December 31, 2013
	Total contracts in long positions			Total contracts in short positions
Derivative Instruments:
Foreign currency exchange contracts	3,031,742			4,000,937

CFD contracts	514,058			19,201

Metals contracts	1,069			680

Total	3,546,869			4,020,818


The Company did not designate any of its derivatives as hedging instruments. Net gains/(losses) with respect to derivative instruments reflected in Trading Revenue in the accompanying Consolidated Statements of Operations and Comprehensive Income for the twelve months ended December 31, 2013 were as follows (amounts in thousands):



Derivative Instruments:
Foreign currency exchange contracts	$	130,668

CFD contracts	21,162

Metals contracts	53,303

Total	$	205,133

Property and Equipment
Property and equipment, including leasehold improvements and capitalized software development costs, consisted of the following as of (amounts in thousands):



	31-Dec-13				31-Dec-12
Software	$	25,913			$	19,757

Computer equipment	6,649				5,248

Leasehold improvements	6,560				1,863

Telephone equipment	714				725

Office equipment	1,994				1,471

Furniture and fixtures	1,108				241

Web site development costs	626				654

	43,564				29,959

Less: Accumulated depreciation and amortization	(26,446		)		(18,936		)
Property and equipment, net	$	17,118			$	11,023

As mentioned in Note 1 above, in September 2013, the Company purchased all of the outstanding share capital of GFT. The allocation of the preliminary purchase price to property and equipment is detailed below in Note 5, “Acquisition”.
Depreciation and amortization expense for property and equipment was $7.8 million, $4.9 million and $3.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.
Intangible Assets
The Company's various finite-lived intangible assets consisted of the following as of (amounts in thousands):


	31-Dec-13								31-Dec-12
	Cost				Accumulated				Cost				Accumulated
					Amortization								Amortization
Customer list	$	21,556			$	(13,594	)		$	19,356			$	(12,138	)

Technology	26,930				(910		)		1,560				(37		)

Trademark	650				(173		)		430				(14		)

Non-compete agreement	1,859				(1,852		)		1,859				(1,510		)

	$	50,995			$	(16,529	)		$	23,205			$	(13,699	)

As mentioned in Note 1 above, in September 2013, the Company purchased all of the outstanding share capital of GFT. The allocation of the preliminary purchase price to intangible assets is detailed below in Note 5, “Acquisition”.
In 2003, the Company acquired the Forex.com domain name for $0.2 million, and in 2004, the foreignexchange.com domain name was purchased for $0.1 million. Because the rights to use these domain names require the payment of a nominal annual renewal fee, management determined that there was no legal, regulatory or technological limitation on their useful lives. Accordingly, these indefinite-lived assets are not amortized. The Company tests intangible assets for impairment on an annual basis in the fourth quarter and on an interim basis when conditions indicate impairment may have occurred.


Balance at January 1, 2011	$	9,089

Purchase of dbFX Customer assets and non-compete	9,701

Amortization and foreign currency transaction gains/losses	(8,019		)
Balance at December 31, 2011	$	10,771

Customer list acquired in acquisition of OEC	1,580

Trademark acquired	430

Technology acquired	1,560

Amortization and foreign currency transaction gains/losses	(4,473		)
Balance at December 31, 2012	$	9,868

Technology acquired	25,300

Customer list acquired	3,150

Finalization in fair value of OEC intangibles (1)	(660		)
Amortization and foreign currency transaction gains/losses	(2,830		)
Balance at December 31, 2013	34,828

(1) To finalize its valuation of OEC acquisition intangibles, the Company reduced the intangibles by $0.7 million, with a corresponding adjustment to goodwill.
Amortization expense for the purchased intangibles was $2.9 million, $4.1 million and $8.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Future annual estimated amortization expense for the next five years is as follows (amounts in thousands):


Years Ended December 31:
2014	4,823

2015	4,823

2016	4,823

2017	3,963

2018	3,213

Goodwill
Goodwill is calculated as the difference between the cost of acquisition and the fair value of the net identifiable assets of an acquired business. As of December 31, 2013 and December 31, 2012, the Company had recorded goodwill of approximately $14.2 million and $9.0 million, respectively.
Goodwill increased $4.8 million during the year as a result of the acquisition of GFT. In addition, during the twelve months ended December 31, 2013, the finalization of the fair value of assets acquired as a result of the OEC acquisition in 2012 resulted in an increase of $0.4 million to goodwill.
Other Assets
Other assets consisted of the following as of (amounts in thousands):


	31-Dec-13				31-Dec-12
Vendor and security deposits	$	3,344			$	3,647

Current tax receivable	4,547				4,898

Deferred tax assets	4,922				5,619

Investment in Kapitall, Inc.	50				500

Indemnification asset	8,596				—

GTX Trade Receivables	4,704				1,335

Miscellaneous receivables, net	2,446				1,154

	$	28,609			$	17,153


The Company has recorded a liability of $8.6 million in Accrued expenses and other liabilities. This represents the Company's best estimate for the settlement of certain liabilities that were incurred as a result of ordinary course of operations in GFT prior to its acquisition. The actual amount required to settle these liabilities may vary from this estimate.

Under the terms of the acquisition of GFT, the selling stockholder of GFT has agreed to indemnify the Company for these liabilities that are expected to be settled after September 24, 2013. Based on the Company's best estimate of the amounts necessary to settle such liabilities, the Company recorded an indemnification asset of $8.6 million at December 31, 2013. This is included within Other current assets in the preliminary purchase price allocation of GFT, refer to note 5.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2013
Related Party Transactions [Abstract]	'
RELATED PARTY TRANSACTIONS	'
	RELATED PARTY TRANSACTIONS
	Certain officers and directors of the Company have personal funds on deposit in separate customer accounts with the Company. These accounts are recorded in Payables to customers, brokers, dealers, FCMs and other regulated entities on the Consolidated Balance Sheets. The aggregate amount of these funds was $3.0 million and $2.4 million at December 31, 2013 and December 31, 2012, respectively.
	Scivantage, Inc. provides hosting services to GAIN Capital Securities, Inc., (“GCSI”) under a one-year agreement dated December 1, 2010, which automatically renews for successive one-year terms, in which Scivantage provides the technology infrastructure hosting facility for GCSI, who provides brokerage securities services. Two members of the Company’s board of directors, Messrs. Calhoun and Sugden, are members of the board of directors of Scivantage.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
ACQUISITIONS	'
	ACQUISITIONS

	Global Futures & Forex, Ltd

	On September 24, 2013, the Company entered into an Amended and Restated Stock Purchase Agreement with Gary L. Tilkin, a natural person (the “Seller”), and GFT, pursuant to which the Company purchased all of the issued and outstanding share capital of GFT from the Seller. The acquisition was made as part of the Company's strategy to increase its offering of products and to expand its retail and institutional businesses into new markets and geographies.

	The preliminary purchase price of GFT was derived as follows (amounts in thousands):



	Cash	$	40,000

	Payment for excess cash adjustment	2,160

	Loan payable	33,200

	Common Stock issued	34,771

	Total purchase price	$	110,131

	The preliminary purchase price of GFT was allocated to the fair value of various assets and liabilities as follows (amounts in thousands):



	Cash and cash equivalents acquired	$	15,781

	Cash and cash equivalents held for customers acquired	228,419

	Receivable from brokers	61,028

	Property and equipment	7,515

	Other current assets	15,002

	Total tangible assets	327,745

	Total liabilities assumed	250,833

	Net assets	76,912

	Consideration less net assets	33,219

	Identifiable intangible assets:
	Software	25,300

	Customer relationships	3,150

	Intangible assets, net	28,450

	Goodwill	4,769

	The foregoing purchase price allocation is preliminary due to the proximity of the closing date of the acquisition to the period end. The final allocation will be based on final analyses of identifiable intangible assets, property and equipment, contingent liabilities and income taxes and will be finalized after the data necessary to complete the analyses of fair values of assets and liabilities is obtained and analyzed.
	Acquisition expenses were $1.8 million for the twelve months ended December 31, 2013. They are recorded in Acquisition expense.
	For the period from acquisition to December 31, 2013, revenues generated by GFT were $26.9 million and expenses were $32.0 million generating a loss before taxes of $5.1 million.

	OEC
	On June 27, 2012, Group, LLC and optionsXpress Holdings, Inc., a subsidiary of The Charles Schwab Corporation, entered into a Stock Purchase Agreement whereby the Company acquired Paragon Futures Group, Inc., which owned all membership interests of OEC, an online futures broker, for a purchase price of $12.0 million. This acquisition was made as part of the Company’s plan to offer additional products to its customers and diversify its revenue streams. The transaction was completed on August 31, 2012. In addition to the $12.0 million paid at the closing, there was an additional payment made in the fourth quarter of 2012 of $2.7 million based on a contractual working capital adjustment.
	The purchase price of OEC was derived as follows (amounts in thousands):


	Cash paid	$	12,000

	Working capital adjustment	2,691

Total purchase price	$	14,691

The purchase price of OEC was allocated to the fair value of various assets and liabilities as follows (amounts in thousands):


Cash and cash equivalents acquired	$	5,187

Cash and securities held for customers acquired	109,042

Receivables from brokers acquired	815

Other assets acquired	98

Total tangible assets acquired	$	115,142

Total liabilities assumed	(109,960		)
Identifiable intangible assets:
Trademark	650

Technology	1,630

Customer relationships	630

Goodwill	6,599



Pro Forma Information (unaudited):
The following unaudited pro forma operating data are presented as if the acquisition of GFT had occurred on January 1st of the respective fiscal years for which comparative information is presented. Additionally, the acquisition of OEC (which was consummated in August 2012) is presented as if it had consummated on January 1, 2012 for the purposes of the comparative periods. The unaudited pro forma data does not include the impact of forecasted operating expense synergies.
The unaudited pro forma data is provided for informational purposes only and may not necessarily be indicative of future results of operations or what the results of operations would have been had the Company and GFT and OEC operated as a combined entity for the periods presented.
Unaudited pro forma income statement line items for the twelve months ended December 31, 2013 and 2012, were as follows (amounts in thousands):


	For the Twelve Months Ended December 31,
	2013			2012

REVENUE:	$	355,489		$	256,114

Total non-interest revenue	$	355,489		$	256,114

Interest revenue	927			1,118

Interest expense	1,865			993

Total net interest (expense) / revenue	(938		)	125

Net revenue	354,551			256,239

EXPENSES:

Other expense items (1)	299,658			269,704

Depreciation and amortization	11,012			8,354

Purchased intangible amortization	5,157			7,488

Acquisition expense	1,824			85

Restructuring	1,570			634

Integration	1,950			—

Total	321,172			286,263

INCOME / (LOSS) BEFORE INCOME TAX EXPENSE	33,379			(30,024		)

Income tax expense / (benefit)	12,517			(11,259		)

Net income / (loss)	$	20,862		$	(18,765	)


(1) Other expenses items for the year ended December 31, 2013, included a one-time, non-recurring expense of $5.1
million relating to a GFT accrual for certain liabilities to third parties.

Restructuring

In 2013, the Company incurred Restructuring expenses, which reflected the cost of reducing global headcount following the GFT acquisition. This category includes charges for employees who left the Company in October and employees on a transition plan, most of whom will leave in the first quarter of 2014.
In 2012, the Company incurred Restructuring expenses in connection with an related headcount reduction.
2013 expenses were $1.6 million, with an additional $0.2 expected to be recorded in 2014, related to this particular restructuring event. Restructuring expenses were $0.6 million in 2012.
These expenses are recorded in Restructuring expense in the Consolidated Statements of Operations and Comprehensive Income.


	For the Twelve Months Ended December 31,
	2013
Restructuring liability as of January 1, 2013	—

2013 restructuring expenses	1,570

Payments made in 2013	986

Liability as of December 31, 2013	584

Shareholders_Equity

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2013
Equity [Abstract]	'
SHAREHOLDERS' EQUITY	'
	SHAREHOLDERS EQUITY

	Common Stock — At December 31, 2013 and 2012, the Company had authorized 60,000,000 shares of Common Stock (“Common Stock”), of which 41,921,609 and 39,425,434 shares were issued and outstanding, respectively as of December 31, 2013 and 36,486,036 and 34,924,095 shares were issued and outstanding, respectively as of December 31, 2012.

	Treasury Stock — As of December 31, 2013, the Company had repurchased 2.5 million shares of outstanding Common Stock for an aggregate cost of $15.5 million reducing the number of shares outstanding.

	Dividends — In February, May, July and November 2013, the Company announced the payment of a $0.05 quarterly dividend per share of Common Stock. The dividend payments announced in February, May, July and November were paid in March, June, September and December 2013, respectively, for an aggregate amount of $7.3 million, which was applied against Retained Earnings. In February 2014, the Company announced the payment of a $0.05 dividend per share of Common Stock payable in March 2014.

Convertible_Senior_Notes

Convertible Senior Notes	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
CONVERTIBLE SENIOR NOTES	'
	CONVERTIBLE SENIOR NOTES

	Convertible Senior Notes due 2018

	On November 27, 2013, the Company issued $80.0 million principal amount of 4.125% Convertible Senior Notes maturing on December 1, 2018. The Company received net proceeds of $77.9 million, after deducting the initial purchasers' discount. The Convertible Notes pay interest semi-annually on June 1 and December 1 at a rate of 4.125% per year, commencing June 1, 2014.

	The Convertible Notes will be convertible at an initial conversion rate of 83.33 shares of the Company's common stock per $1,000 principal amount, which is equivalent to an initial conversion price of approximately $12.00. In addition, following certain corporate transactions occurring prior to the maturity date, the Company will, in certain circumstances, increase the conversion rate for a holder electing to convert notes in connection with such corporate transaction. Upon conversion, the Company will deliver cash up to the principal amount. With respect to any conversion value in excess of the principal amount, the Company will deliver shares of its common stock, unless it elects to deliver cash in lieu of all or a portion of such shares.

	Holders may convert notes in integral multiples of $1,000 principal amount, at any time prior to the close of business on the business day immediately preceding June 1, 2018, but only in the following circumstances:


	•	During any calendar quarter commencing after the calendar quarter ending on March 31, 2014 (and only during such quarter), the last reported sale price of the Company’s common stock for each of at least 20 of the preceding 30 trading days, ending on and including the last trading day of the quarter exceeds 130% of the conversion price. These days need not be consecutive;

	•	During the five consecutive business day period immediately after any five consecutive trading day period, if the aggregate share cap does not apply, or ten consecutive trading day period, if the aggregate share cap does apply (such five or ten consecutive trading day period, as applicable, being referred to as the “measurement period”), in which the trading price (as defined in the offering memorandum) per $1,000 principal amount of the notes, as determined following a request by a holder of the notes in the manner described in the offering memorandum, for each trading day of the measurement period was less than 98% of the product of the last reported sale price of our common stock and the conversion rate on such trading day;

	•	Upon the occurrence of specified corporate events (as described in the offering memorandum);

	•	If we have called the notes for redemption (as described in the offering memorandum);

	In addition, regardless of the foregoing circumstances, holders may convert their notes at any time on or after June 1, 2018 until the close of business on the business day immediately preceding the maturity date.

	In addition, if the Company undergoes a fundamental change (as defined in the Note indenture), holders may, subject to certain conditions, require the Company to repurchase their notes for cash at a price equal to 100% of the principal amount of the notes to be purchased, plus accrued and unpaid interest.

	Under ASC 470, an entity must separately account for the liability and equity components of a convertible debt instruments that may be settled entirely or partially in cash upon conversion. The separate accounting must reflect the issuer's economic interest cost. The fair value of the equity component, net of pro-rata initial purchasers’ discounts, is included in the additional paid-in capital section of stockholders' equity in the Company's consolidated statement of financial condition. The principal amount of the Convertible Notes is reduced by unamortized original issue discount, which reflects the Convertible Notes fair value. At issuance, the equity component of the Convertible Notes was valued at $12.6 million before pro-rata initial purchasers' commissions of $0.3 million and related additional costs of $0.1 million. The Convertible Notes were valued at $67.4 million consisting of $80.0 million of principal net of $12.6 million allocated to equity, not including pro-rata initial purchasers' commissions of $1.8 million and additional related costs of $0.5 million. The original issue discount will be amortized over the life of the Convertible Notes using the effective interest rate of 8.0%.

	Relevant accounting guidance requires entities to disclose the dilutive effects of convertible instruments. As of December 31, 2013, the Company’s common stock had not met the convertibility criteria noted in the offering memorandum. Therefore, the Convertible Senior Notes were not dilutive as of December 31, 2013.

	The balances of the liability and equity components as of December 31, 2013, were as follows, with amounts in thousands:



		December 31,

		2013

	Liability component - principal	$	80,000

	Deferred bond discount	(14,640		)
	Liability component - net carrying value	$	65,360


	Additional paid in capital	$	12,572

	Discount attributable to equity	(425		)
	Equity component	$	12,147


	Interest expense related to the Convertible Notes, included in Interest on borrowings in the condensed consolidated statements of operations was as follows, with amounts in thousands:



		Twelve Months Ended

		December 31,

		2013

	Interest expense - stated coupon rate	$	275

	Interest expense - amortization of deferred bond discount and costs	213

	Total interest expense - convertible note	$	488


The Company incurred $2.7 million of Convertible Notes issuance cost and additional related fees. Amortization of Convertible Notes issuance costs included in Interest expense in the consolidated statements of operations was $0.2 million for the twelve months ended December 31, 2013. Unamortized Convertible Notes issuance discount was $1.9 million at December 31, 2013 and is included in Convertible senior notes and Additional paid in capital in the Consolidated balance sheets.

Share_Based_Compensation

Share Based Compensation	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
SHARE BASED COMPENSATION	'
	SHARE BASED COMPENSATION

	Share Based Payment

	On November 22, 2010, the Company’s board of directors adopted the GAIN Capital Holdings, Inc. 2010 Omnibus Incentive Compensation Plan, (the “2010 Plan”), which became effective December 13, 2010. Initially, the 2010 Plan made available 7.1 million shares (1.5 million to be issued pursuant to future awards and grants under the 2010 Omnibus Incentive Compensation plan, 5.2 million shares that are subject to outstanding grants under a predecessor plan, and 0.4 million shares to be issued pursuant to the 2011 Employee Stock Purchase Plan) for awards to employees, nonemployee directors, consultants, and advisors in the form of incentive stock options, nonqualified stock options, stock awards, stock units, stock appreciation rights and other stock-based awards. In addition, as of the first trading day of January during the term of the 2010 Plan, beginning with calendar year 2012, an additional positive number of shares of the Company’s stock shall be added to the number of shares of the Company stock authorized to be issued or transferred under the 2010 Plan equal to (1) three percent (3%) of the total number of shares of Company stock outstanding (on a fully diluted basis) as of the last trading day in December of the immediately preceding calendar year, or (2) such lesser number of shares as the Company’s board of directors may determine. On January 1, 2013 the Company authorized an additional 1.2 million shares to be issued or transferred under the 2010 Plan. On January 1, 2014, the Company authorized an additional 1.3 million shares to be issued or transferred under the 2010 Plan pursuant to the terms of the 2010 Plan.

	Under the 2010 Plan, the committee will determine the exercise price of the options granted and may grant options to purchase shares of the Company’s common stock in amounts as determined by the committee. The committee may grant options that are intended to qualify as ISOs under Section 422 of the Internal Revenue Code, or NQSOs which are not intended to so qualify. ISOs may only be granted to employees. Anyone eligible to participate in the 2010 Plan may receive a grant of NQSQs. The exercise price of a stock option granted under the 2010 Plan cannot be less than the fair market value of a share of the Company’s common stock on the date the option is granted. All options granted under the 2010 Plan expire seven years from the date of grant.

	Stock Options

	The following table summarizes the stock option activity under all plans from January 1, 2013 through December 31, 2013:



			Options Outstanding
											Weighted
							Weighted				Average
			Number of				Average				Remaining		Aggregate
			Options				Exercise Price				Life (Years)		Intrinsic Value
	Outstanding January 1, 2013		3,588,900				$	2.32			1.09

	Granted		496,000				$	5.3			6.17

	Exercised		(1,394,977		)		$	1.83			1.99

	Forfeited		(66,798		)		$	4.85			7.84

	Outstanding December 31, 2013		2,623,125				$	4.1			4.6		9,111,804

	Vested and expected to vest options		2,554,173				$	4.07			4.18		8,929,214

	Exercisable, December 31, 2013		1,614,240				$	3.51			3.92		6,535,178


	Fair market value of common stock at exercise date		$	7,279,641

	Cost to exercise		2,538,979

	Net value of Stock options exercised		$	4,740,662


	The following table summarizes information concerning outstanding and exercisable stock options as of December 31, 2013:


			Options Outstanding									Options Exercisable
										Weighted
										Average
						Weighted				Remaining		Number of			Weighted
			Number			Average				Contractual		Options			Average
	Exercise Price		Outstanding			Exercise Price				Life (Years)		Exercisable			Exercise Price
	$1.11		11,660			1.11				0.42		11,660			1.11

	$1.55		374			1.55				1.02		374			1.55

	$1.99		462,488			1.99				1.41		462,488			1.99

	$2.43		262,161			2.43				1.86		262,161			2.43

	$2.87		38,135			2.87				1.81		38,135			2.87

	$3.83		767,574			3.83				6.31		603,526			3.83

	$4.40		481,000			4.4				8.9		—			—

$5.30		293,563			5.3				7.86		78,312			5.3

$8.02		306,170			8.02				6.94		157,584			8.02

		2,623,125			$	4.1			4.6		1,614,240			$	3.51


The weighted-average remaining contractual life for the 2.6 million outstanding options as of December 31, 2013, is approximately 4.60 years. There were 1.6 million stock options exercisable as of December 31, 2013. The total intrinsic value of stock options exercised during 2013, 2012 and 2011 respectively were $4.7 million, $3.3 million and $2.0 million. During 2013, the Company had 0.3 million stock options vest. The Company received $2.5 million, $2.0 million, and $0.9 million from stock option exercises in 2013, 2012 and 2011, respectively.

In March 2013, the Company granted 0.5 million options to employees. In 2012, the Company granted 0.3 million options to employees. In 2011, 0.4 million options were granted to employees.

The Compensation Committee of the Company's Board of Directors approved stock option grants with a fair market value estimated under a Black-Scholes option pricing valuation model using the following assumptions:



	For the Twelve Months Ended December 31,
	2013		2012		2011
Valuation Assumptions
Risk-free rate	0.80%		0.90%		2.30%
Expected volatility	48.80%		48.50%		47.60%
Expected term (years)	4.8 years		4.8 years		4.8 years
Dividend yield	4.90%		4.90%		—%

The expected volatility was calculated based upon the volatility of public companies in similar industries or financial service companies. The average risk free rate is based upon the risk free rate of the U.S. Treasury bond rate with a maturity commensurate with the expected term. The options granted during 2013 were granted on March 1, 2013. For any future grants, the Company’s current history of paying cash dividends on a quarterly basis will be considered in assessing a market participant view of the appropriate expected dividend yield in the related option pricing valuation model.

The Company recorded stock-based compensation expense related to options in accordance with ASC 718-10 of $0.7 million, $0.8 million and $0.8 million in 2013, 2012 and 2011, respectively. The stock-based compensation expense is recorded in Employee compensation and benefits on the Consolidated Statements of Operations and Comprehensive Income.

Restricted Stock Units and Restricted Stock Awards

The 2010 Plan provides for the issuance of RSUs that are convertible on a 1:1 basis into shares of the Company’s common stock. The Company maintains a restricted unit account for each grantee. Restrictions typically lapse over four years, with 25% lapsing on each anniversary date of the grant. After the restrictions lapse, the grantee shall receive payment in the form of cash, shares of the Company’s common stock, or in a combination of the two, as determined by the Company. Payment shall be made upon the date the restrictions lapse, upon a predetermined delivery date, upon a change in control of the Company. or upon the employee leaving the Company. The Company has historically settled these awards through the issuance of common stock to recipients and intends to continue to do so. The Company may also issue performance grants which have restrictions lapsing immediately, but delivery of the common stock deferred until a later date. RSUs are assigned the value of the Company’s common stock at date of grant issuance, and the grant date fair value is amortized over a four year period. During 2013, 0.8 million RSUs were granted to employees and members of the Board of Directors. During 2012, 0.6 million RSUs were granted to employees and members of the Board of Directors.

The 2010 Plan also provides for the issuance of restricted stock awards, or RSAs, which represent shares of the Company’s common stock. The Company maintains a restricted stock award account for each grantee. Restrictions typically lapse over four years, with 25% lapsing on each anniversary date of the grant. After the restrictions lapse, or upon a change in control of the Company the grantee shall receive payment in the form of cash, shares of the Company’s common stock, or in a combination of the two, as determined by the Company. The Company has historically settled these awards through the issuance of common stock to recipients and intends to continue to do so. The Company may also issue performance grants which have immediate vesting. There were no RSAs granted during 2013 or 2012. During 2011, 0.2 million RSAs were granted to employees and members of the Board of Directors.

The Company recorded $2.2 million, $2.5 million and $3.2 million in stock-based compensation expense related to restricted stock for the year ended December 31, 2013, 2012 and 2011, respectively.

A summary of the status of the Company’s nonvested shares of restricted stock units and restricted stock awards as of December 31, 2013 and changes during the year ended December 31, 2013, is presented below:



				Weighted Average							Weighted Average
	Number			Grant Date				Number			Grant Date
Non-Vested Shares	of RSUs			Fair Value				of RSAs			Fair Value
Non-vested at January 1, 2013	586,096			$	5.8			181,888			$	7.2

Granted	812,442			4.4				—			—

Vested	(276,466	)		6				(63,220	)		7.22

Forfeited	(92,677	)		4.75				(7,229	)		6.71

Non-vested at December 31, 2013	1,029,395			$	4.7			111,439			$	7.28


As of December 31, 2013 there was $4.5 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements granted under the 2010 Plan. The cost is expected to be recognized over a weighted-average period of approximately two years. The fair market value on the grant date for RSUs and RSAs vested during the years ended December 31, 2013, 2012 and 2011 was $1.7 million, $3.1 million and $3.9 million, respectively. The total intrinsic value of the RSUs and RSAs that became unrestricted during the year ended December 31, 2013 was $1.8 million at the date they became unrestricted. RSUs and RSAs that were vested and outstanding as of December 31, 2013 had a value at grant date of $21.5 million. The Company granted RSUs during the year ended December 31, 2013 which had a value of $3.6 million at grant date. The fair market value of RSUs and RSAs at the date of grant during the year ended December 31, 2012 was $3.1 million.

Employee Stock Purchase Plan

The 2011 Employee Stock Purchase Plan, or the ESPP, was adopted by the Company’s board of directors on November 22, 2010. The ESPP became effective on January 1, 2011. The ESPP permits eligible employees to purchase shares of the Company’s common stock at a 15% discount from the lesser of the fair market value per share of the Company’s common stock on the first day of the offering period or the fair market value of the Company’s common stock on the interim purchase date through after-tax payroll deductions. Shares reserved for issuance under the ESPP was initially 500,000. It is intended that the ESPP meet the requirements for an “employee stock purchase plan” under Section 423 of the Internal Revenue Code. For the year ended December 31, 2013, 0.08 million shares were issued under the plan. For the year ended December 31, 2012, 0.05 million shares were issued under the ESPP.

Earnings_Per_Common_Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
EARNINGS PER COMMON SHARE	'
	EARNINGS PER COMMON SHARE
	Basic and diluted earnings per common share are computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share includes the determinants of basic net income per share and, in addition, gives effect to the potential dilution that would occur if securities or other contracts to issue common stock were exercised, vested or converted into common stock, unless they are anti-dilutive. Diluted weighted average common shares include vested and unvested stock options, vested restricted stock units which are to be delivered as soon as administratively practicable on or after December 31, 2013, unvested restricted stock units and unvested restricted stock awards. Approximately 0.3 million and 0.6 million stock options were excluded from the calculation of diluted earnings per share for the twelve months ended December 31, 2013 and the twelve months ended December 31, 2012, respectively, as they were anti-dilutive.
	The following table sets forth the computation of earnings per share (amounts in thousands except share and per share data):



		For the years ended December 31,

		2013			2012		2011

	Net income applicable to GAIN Capital Holdings, Inc.	$	31,311		$	2,621	$	15,698

	Series E correction(1)	(154		)	—		—

	Net income after correction	31,157			2,621		15,698

	Weighted average common shares outstanding:

	Basic weighted average common shares outstanding	36,551,246			34,940,800		34,286,840

	Effect of dilutive securities:

	Warrants	—			—		160,529

	Stock options	1,214,370			1,490,089		2,732,302

	RSUs/RSAs	1,867,262			1,449,319		1,802,121

	Diluted weighted average common shares outstanding	39,632,878			37,880,208		38,981,792

	Earnings per common share

	Basic	$	0.85		$	0.08	$	0.46

	Diluted	$	0.79		$	0.07	$	0.4



	-1	During the period an adjustment to retained earnings was made, reflecting the amounts deemed uncollectible associated with previously issued preferred stock, which was converted to common stock immediately prior to the IPO.

Legal

Legal	12 Months Ended
Legal	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
LEGAL	'
	LEGAL
	From time to time the Company becomes involved in legal proceedings and in each case the Company assesses the likely liability and/or the amount of damages as appropriate. Where available information indicates that it is probable a liability had been incurred at the date of the condensed consolidated financial statements and the Company can reasonably estimate the amount of that loss, the Company accrues the estimated loss by a charge to income. In many proceedings, however, it is inherently difficult to determine whether any loss is probable or even possible or to estimate the amount of any loss. In addition, even where loss is possible or an exposure to loss exists in excess of the liability already accrued with respect to a previously recognized loss contingency, it is often not possible to reasonably estimate the size of the possible loss or range of loss.
	For certain legal proceedings, the Company can estimate possible losses, additional losses, ranges of loss or ranges of additional loss in excess of amounts accrued. For certain other legal proceedings, the Company cannot reasonably estimate such losses, if any, since the Company cannot predict if, how or when such proceedings will be resolved or what the eventual settlement, fine, penalty or other relief, if any, may be, particularly for proceedings that are in their early stages of development or where plaintiffs seek substantial or indeterminate damages. Numerous issues must be developed, including the need to discover and determine important factual matters and the need to address novel or unsettled legal questions relevant to the proceedings in question, before a loss or additional loss or range of loss or additional loss can be reasonably estimated for any proceeding.
	Litigation

	On February 16, 2012, the Company received a Letter of Claim on behalf of certain individuals who had lost money in an investment scheme operated by a third-party money management firm, incorporated in the United Kingdom, which has since been closed down by the United Kingdom’s Financial Services Authority (now known as the Financial Conduct Authority). The investment firm, Cameron Farley Ltd, had opened a corporate account with the Company and invested the individuals’ money, representing such funds as its own, while operating a fraudulent scheme. Though a complaint has been filed and served on the Company, the claimants requested, and the Company agreed, to follow the United Kingdom’s Pre-Action Protocol, a pre-litigation process intended to resolve matters without the need to engage in formal litigation. The Company submitted a Response to the Letter before Claim on July 4, 2012. On July 5, 2012 the Company received a substantially similar Letter of Claim on behalf of further individuals. Subsequently, the parties agreed to consolidate claims by those other similarly situated individuals with the pending Pre-Action Protocol process. The parties agreed it would be more appropriate for the proceedings to be dealt with in the Commercial Court and the matters were transferred pursuant to Consent Orders dated March 14, 2013. The Company subsequently filed an application for strike out and/or summary judgment in respect of all claims on March 15, 2013. The claimants filed an answer to the Company's motion on June 2, 2013 and subsequently the Company filed a response to this answer on July 15, 2013. A hearing was held on the Company's application for strike out and/or summary judgment on September 18 and 19, 2013. After the hearing, the judge asked the claimants to respond in writing to his additional questions from the hearing. The complaints had until October 11, 2013 to provide answers and the Company was given until November 1, 2013 to respond. On February 26, 2014, the judge denied the Company’s motion for strike out/summary judgment. The Company can provide no assurances that this matter will be successfully resolved. This matter is currently pending. At this time, a potential loss or a potential range of loss cannot be reasonably estimated.

	Through the Company’s acquisition of OEC, the Company became the subject of a patent infringement lawsuit originally filed against OEC on February 9, 2010 in the U.S. District Court for the Northern District of Illinois by Trading Technologies International, Inc. seeking injunctive relief and unspecified damages. As reflected in a Second Amended Complaint filed on June 15, 2011, plaintiff alleges infringement of 12 patents relating to real-time display of price quotes and market depth on OEC’s electronic trading interfaces. The case was consolidated with 11 related cases in February 2011, and the parties have exchanged infringement, non-infringement and invalidity contentions for several of the disputed patents. In June 2011, the court stayed discovery to allow summary judgment briefing on the ramifications of a recent Federal Circuit decision. On February 9, 2012, the court issued an order, which granted Defendants' motions for summary judgment, resulting in a substantial narrowing of the scope of plaintiff’s claims. Plaintiff filed a motion for reconsideration of that ruling on March 8, 2012. Plaintiff also filed a motion for certification of judgment for interlocutory appeal. The court denied plaintiff’s motion for reconsideration but granted plaintiff’s motion for certification of judgments of patent invalidity with respect to four of the asserted patents. On August 30, 2013, the Federal Circuit issued its opinion vacating and remanding the court’s judgment of patent invalidity regarding four of the asserted patents. On remand, Defendants renewed their motion for summary judgment of patent invalidity and the court is currently considering when to revisit the invalidity issue. Since the court’s certification of judgments ruling, the court has continued its stay of discovery. Plaintiff’s complaint does not specify the amount of damages sought. At this time, a potential loss or a potential range of loss cannot be reasonably estimated.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
COMMITMENTS AND CONTINGENCIES	'
	COMMITMENTS AND CONTINGENCIES

	Leases — The Company leases office space under non-cancelable operating lease agreements that expire on various dates through 2025. Such leases do not require any contingent rental payments or impose any financial restrictions. The majority of leases include renewal terms substantially the same as the current terms. Future annual minimum lease payments, including maintenance and management fees, for non-cancellable operating leases, are as follows (amounts in thousands):


	Years Ended December 31:
	2014	$	4,193

	2015	3,550

	2016	2,838

	2017	2,045

	2018 and beyond	9,258

		$	21,884


	Rent expense was $3.7 million, $2.6 million, and $2.5 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	INCOME TAXES
	The following table presents the U.S. and non-U.S. components of income before income tax expense / (benefit) for the years ended December 31, 2013, 2012, and 2011 (amounts in thousands):


		For the Fiscal Year Ended
		December 31,
		2013				2012				2011
	U.S.	$	17,375			$	(10,795	)		$	9,766

	Non-U.S.	27,730				11,937				13,478

		$	45,105			$	1,142			$	23,244


	The provision for income tax expense / (benefit) consisted of (amounts in thousands):



		For the Fiscal Year Ended
		December 31,
		2013				2012				2011
	Current
	Federal	$	6,651			$	(2,880	)		$	4,803

	State	170				34				1,453

	UK	6,917				2,750				3,396

	Japan	14				14				—

	Other non-U.S.	3				3				1

		13,755				(79		)		9,653

	Deferred
	Federal	(565		)		(865		)		(1,953		)
	State	328				(1		)		(338		)

	Japan	121				126				184

	Other non-U.S.	(235		)		(30		)		—

	Change in valuation allowance	390				(630		)		—

		39				(1,400		)		(2,107		)

	Total income tax expense / (benefit)	$	13,794			$	(1,479	)		$	7,546


	Deferred income taxes reflect the net tax effects of temporary differences between the financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when such differences are expected to reverse. The Company’s net deferred tax assets are included in Other assets on the Consolidated Balance Sheets. The net change in valuation allowance for the year ended December 31, 2013 was $0.4 million. Significant components of the Company’s deferred tax assets and liabilities were as follows (amounts in thousands):


		December 31,
		2013				2012
	Deferred tax assets
	Net foreign exchange operating losses	$	2,006			$	1,893

	Stock-based compensation expense	6,334				6,608

	Intangible assets	2,777				3,414

	Other	942				588

Total deferred tax assets	12,059				12,503

Valuation allowance	(493		)		(103		)
Total deferred tax assets after valuation allowance	$	11,566			$	12,400


Deferred tax liabilities
Unrealized trading differences	$	(5,653	)		$	(4,867	)
Unrealized foreign currency	—				(152		)

Basis difference in property and equipment	(333		)		(1,546		)
State taxes	(26		)		(78		)
Other	(632		)		(138		)
Total deferred liabilities	(6,644		)		(6,781		)
Net deferred tax assets	$	4,922			$	5,619


The Company has restated the 2012 deferred tax assets to reflect an error. See Note 1 for details.

The following table reconciles the provision to the U.S. federal statutory income tax rate:


	2013			2012			2011
Federal income tax at statutory rate	35	%		35	%		35	%
Increase/(decrease) in taxes resulting from:
State income tax	0.75	%		2.47	%		3.06	%
Foreign rate differential	(6.45	)%		(121.09	)%		(4.24	)%
Meals & entertainment	0.16	%		5.65	%		0.4	%
R&D credit	—	%		7.47	%		(0.7	)%
Establishment/(release) of valuation allowance	0.87	%		(51.34	)%		—	%
Uncertain tax positions	(0.05	)%		(9.04	)%		—	%
Other permanent differences	0.3	%		1.46	%		(1.06	)%
Effective Tax Rate	30.58	%		(129.42	)%		32.46	%

The Company has $7.9 million in foreign net operating loss (“NOL”) carry forwards as of December 31, 2013. These NOLs begin to expire in 2019. The Company has a deferred tax asset of $2.0 million relating to these NOLs for which it has established a valuation allowance of $0.5 million.

At December 31, 2013, undistributed earnings of our foreign subsidiaries indefinitely invested outside the United States amounted to approximately $53.7 million. No provision has been made for foreign taxes associated with the cumulative undistributed earnings of foreign subsidiaries, as these earnings are expected to be reinvested in working capital and other business needs. Upon repatriation of those earnings, in the form of dividends or otherwise, the Company would be subject to income taxes of approximately $6.2 million, subject to an adjustment for the participation exemption.

The Company has recorded a liability of $0.1 million related to uncertain tax positions at December 31, 2013 in accordance with ASC 740-10, Income Taxes.

The following table summarizes the activity to the gross unrecognized Tax benefits from uncertain tax positions (amounts in thousands):


	As of December 31,

	2013				2012				2011

Beginning balance as of January 1	$	78			$	189			$	126

Increases based on tax positions related to the current period	—				3				39

Increases based on tax positions related to prior periods	—								56

Decreases based on tax positions related to prior periods	(21		)		(20		)		—

Decreases related to a lapse of applicable statute of limitations	—				(94		)		(32		)

Ending balance as of December 31	$	57			$	78			$	189


The Company’s open tax years range from 2010 through 2012 for its U.S. federal returns, from 2009 through 2012 for the U.K., from March 2012 through March 2013 for Japan and from 2009 through 2012 for its major state jurisdictions.

Included in the total unrecognized tax benefits at December 31, 2013, 2012, and 2011 is $0.1 million, $0.1 million, and $0.2 million, respectively, that if recognized would favorably affect the effective tax rate. No unrecognized tax benefits were recorded at December 31, 2013. It is reasonably possible that the amount of liability for unrecognized tax benefits could change during the next 12 months. An estimate of the range of the possible change cannot be made until issues are further developed or examinations closed.

Retirement_Plans

Retirement Plans	12 Months Ended
Retirement Plans	Dec. 31, 2013
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]	'
RETIREMENT PLANS	'
	RETIREMENT PLANS

	The Company sponsors a “Safe Harbor” 401(k) retirement plan which was put into effect as of January 1, 2011. The plan provides for a 100% match by GAIN on the first 3% of the employee’s salary contributed to the plan and 50% on the next 2% with immediate vesting on all employer contributions, subject to IRS limitations. Substantially all of the Company’s employees are eligible to participate in the plan.

	Prior to 2011, the Company sponsored a 401(k) retirement plan, under the terms of which the Company was obligated to match 25% (50% for employees with three years or more of service) of the employee’s salary contributed to the plan up to 15% of the employee’s compensation for each payroll period.

	The expense recorded to employee compensation and benefits on the Consolidated Statements of Operations and Comprehensive Income by the Company for its employees’ participation in the respective plans during the years ended December 31, 2013, 2012 and 2011 was $0.9 million, $0.5 million, and $0.7 million, respectively.

Regulatory_Requirements

Regulatory Requirements	12 Months Ended
	Dec. 31, 2013
Banking and Thrift [Abstract]	'
REGULATORY REQUIREMENTS	'
	REGULATORY REQUIREMENTS
	Regulatory requirements have remained substantially the same as those disclosed in the Company’s Annual Report on Form 10-K filed with the SEC on March 18, 2013 with the exception of the requirements of GAIN Capital Forex.com Australia, Pty. Ltd. (“GCAU”). GCAU holds an Australian Financial Services License issued by the Australian Securities & Investments Commission (“ASIC”). As of January 31, 2013, the ASIC implemented changes to the Regulatory Guide 166. As a result of these changes, GCAU is required to maintain a minimum capital requirement of $0.4 million (AUD 0.5 million) or 5% of the average revenue. This change did not have a material impact on the Company or GCAU.
	Group, LLC, the Company’s FCM and RFED subsidiary, is subject to the CFTC Net Capital Rule (Rule 1.17) and NFA Financial Requirements Sections 11 and 12. Under applicable provisions of these rules, Group, LLC is required to maintain adjusted net capital of $20.0 million plus 5.0% of the total payables to customers over $10.0 million. At December 31, 2013, Group LLC maintained $14.5 million more than the minimum required regulatory capital for a total of 1.6 times the required capital and at all times maintained compliance with all applicable regulations.
	GCSI is a broker-dealer registered with the SEC under the Securities Exchange Act of 1934, as amended. GCSI is a member of the Financial Industry Regulatory Authority (“FINRA”), Municipal Securities Rulemaking Board (“MSRB”), and Securities Investor Protection Corporation (“SIPC”). Pursuant to the SEC’s Uniform Net Capital Rule 15c3-1, GCSI is required to maintain a minimum net capital balance (as defined) of $0.05 million. GCSI must also maintain a ratio of aggregate indebtedness (as defined) to net capital of not more than 15 to 1. At December 31, 2013, GCSI maintained $0.4 million more than the minimum required regulatory capital for a total of 9 times the required capital and at all times maintained compliance with all applicable regulations.

	GAIN Capital Forex.com UK Ltd. (“GCUK”) is registered in the UK and regulated by the Financial Conduct Authority (“FCA”) as a full scope €730k BIPRU Investment Firm. GCUK is required to maintain the greater of $1.0 million (€730,000) or the Financial Resources Requirement, which is calculated as the sum of the firm’s operational, credit, counterparty, concentration, market and forex risk. The regulatory capital held is required to be in excess of 110% of its requirements at all times. At December 31, 2013, GCUK maintained $37.0 million more than the minimum required regulatory capital for a total of 2.8 times the required capital and at all times maintained compliance with all applicable regulations.

	GFT Global Markets UK Limited, or GFTUK, is registered in the UK and regulated by the FCA as a full scope €730k BIPRU Investment Firm and is subject to the same regulatory capital requirements as GCUK. At December 31, 2013, GFTUK maintained $10 million more than the required minimum regulatory capital for a total of 1.3 times the required capital and at all times maintained compliance with all applicable regulations. Effective February 28, 2014, substantially all of GFTUK's business and operations were transferred to GCUK.

	Forex.com Japan Co., Ltd. (“GC Japan”) is a registered Type I financial instruments business firm regulated by the Japan Financial Services Agency in accordance with Financial Instruments and Exchange Law (Law No. 25 of 1948, as amended). GC Japan is a member of the Financial Futures Association of Japan. GC Japan is subject to a minimum capital adequacy ratio of 120%, which is derived by dividing Net Capital (as defined in Law No. 25) by the sum of GC Japan’s market, counterparty credit risk and operational risk. At December 31, 2013, GC Japan maintained $6.4 million more than the minimum required regulatory capital for a total of 3 times the required capital and at all times maintained compliance with all applicable regulations.

	GCAU holds an Australian Financial Services License issued by the Australian Securities & Investments Commission (“ASIC”). GCAU is required to maintain a minimum capital requirement of $0.05 million (0.05 million AUD) plus 5% of adjusted liabilities between $1.02 million (1 million AUD) and $101.6 million (100 million AUD). At December 31, 2013, GCAU maintained $2.3 million more than the minimum required regulatory capital for a total of 8.7 times the required capital and at all times maintained compliance with all applicable regulations.

	GCHK is licensed by the Securities and Futures Commission (“SFC”) to carry out Type 3 Regulated Activity, Leveraged Foreign Exchange Trading. GCHK is subject to the requirements of section 145 of the Securities and Futures Ordinance (Cap.571). Under this rule, GCHK is required to maintain a minimum liquid capital requirement of the higher of $1.9 million or the sum of 1.5% of its aggregate gross foreign currency position and 5% of its adjusted liabilities and clients’ margin calculated in accordance with applicable rules. At December 31, 2013, GCHK maintained $1.9 million more than the minimum required regulatory capital for a total of 2 times the required capital and at all times maintained compliance with all applicable regulations.

	GAIN Global Markets, Inc. (“GGMI”), the Company’s Cayman Island subsidiary, is a registered securities arranger with the Cayman Islands Monetary Authority (“CIMA”). GGMI is required to maintain a capital level that is the greater of one quarter of relevant annual expenditure, or $100,000. At December 31, 2013, GGMI maintained $0.2 million more than the minimum required regulatory capital for a total of 3 times the required capital and at all times maintained compliance with all applicable regulations.

	Gain Capital-Forex.com Canada Ltd (“GCC”) became registered as an investment dealer with the Investment Industry Regulatory Organization of Canada (“IIROC”) in May 2012. GCC is required to maintain a minimum capital requirement of $0.25 million (0.25 million CAD) and comply with applicable margin and securities concentration charges. At December 31, 2013, GCC maintained $1.8 million more than the minimum required regulatory capital for a total of 10 times the required capital and at all times maintained compliance with all applicable regulations.

	GFT Global Markets Asia Pte Limited , or GFT SG, is a sole proprietorship foreign exchange trading firm registered with the Monetary Authority of Singapore, or MAS, and operates as an approved holder of Capital Markets Services License. GFT SG is subject to the requirements of MAS and pursuant to the Securities and Futures Act (Cap.289) and a Commodity Brokers License granted under the Commodity Trading Act by the International Enterprise of Singapore. Under these rules, GFT SG is required to maintain a minimum liquid capital requirement of $1.6 million (2.0 million SGD). At December 31, 2013, GFT SG maintained $0.1 million than the required minimum regulatory capital for a total of 1.0 times the required capital and at all times maintained compliance with all applicable regulations.
	The following table illustrates the minimum regulatory capital our subsidiaries were required to maintain as of December 31, 2013 and the actual amounts of capital that were maintained (amounts in millions):



	Entity Name	Minimum Regulatory Capital Requirements		Capital Levels Maintained		Excess Net Capital		Percent of Requirement Maintained
	GFT Global Markets UK Ltd.	$	32.3	$	57.2	$	24.9	177	%

	GAIN Capital Group, LLC	24.6		39.1		14.5		159	%

	GAIN Capital-Forex.com U.K., Ltd.	20.5		57.5		37		280	%

	Forex.com Japan Co., Ltd.	3.1		9.5		6.4		306	%

	GAIN Capital-Forex.com Hong Kong, Ltd.	1.9		3.8		1.9		200	%

	Global Futures & Forex, Ltd.	1		9		8		900	%

	GAIN Capital Forex.com Australia, Pty. Ltd.	0.3		2.6		2.3		867	%

	GAIN Capital-Forex.com Canada Ltd.	0.2		2		1.8		1,000	%

	GAIN Capital Securities, Inc.	0.1		0.5		0.4		500	%

	GAIN Global Markets, Inc.	0.1		0.3		0.2		300	%

	GFT Global Markets Asia Pte., Ltd.	1.6		1.7		0.1		106	%

	Total	$	85.7	$	183.2	$	97.5	214	%

Segment_Information

Segment Information	12 Months Ended
Segment Information	Dec. 31, 2013
Segment Reporting [Abstract]	'
SEGMENT INFORMATION	'
	SEGMENT INFORMATION
	ASC 280, Disclosures about Segments of an Enterprise and Related Information, establishes standards for reporting information about operating segments. Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision-maker, or decision making group, in deciding how to allocate resources and in assessing performance. Reportable segments are defined as an operating segment that either (a) exceeds 10% of revenue, or (b) reported profit or loss in absolute amount exceeds 10% of profit of all operating segments that did not report a loss or (c) exceeds 10% of the combined assets of all operating segments. The Company’s operations relate to global trading services and solutions. Based on the Company’s management strategies, and common production, marketing, development and client coverage teams, the Company has concluded that it operates in a single operating segment.
	For the twelve months ended December 31, 2013 and the twelve months ended December 31, 2012, no single retail or institutional customer accounted for more than 3% of the Company’s total net revenue.

Quarterly_Financial_Data_Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
QUARTERLY FINANCIAL DATA (UNAUDITED)	'
	QUARTERLY FINANCIAL DATA (UNAUDITED)

	The following table sets forth selected quarterly financial data for 2013 and 2012 (in thousands, except per share data):


		First			Second		Third		Fourth
		Quarter			Quarter		Quarter		Quarter
	For the Year Ended December 31, 2013
	Gross revenue	$	49,754		$	72,833	$	60,571	$	83,801

	Net revenue	$	49,765		$	72,995	$	60,598	$	83,033

	Income before income tax expense	$	5,140		$	24,433	$	8,643	$	6,889

	Net income	$	4,279		$	17,164	$	5,600	$	4,268

	Basic net income per share	$	0.12		$	0.48	$	0.16	$	0.11

	Diluted net income per share	$	0.11		$	0.44	$	0.14	$	0.1


	For the Year Ended December 31, 2012
	Gross revenue	$	33,309		$	45,721	$	39,908	$	32,286

	Net revenue	$	33,246		$	45,684	$	39,985	$	32,445

	(Loss) / income before income tax expense	$	(1,859	)	$	5,988	$	4,431	$	(7,418	)

	Net (loss) / income	$	(1,247	)	$	4,435	$	3,221	$	(3,787	)

	Basic net (loss) / income per share	$	(0.04	)	$	0.13	$	0.09	$	(0.11	)

	Diluted net (loss) / income per share	$	(0.04	)	$	0.11	$	0.08	$	(0.11	)

Subsequent_Events

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2013
Subsequent Events [Abstract]	'
SUBSEQUENT EVENTS	'
	SUBSEQUENT EVENTS

	In February 2014, the Company announced the payment of a $0.05 dividend per share of Common Stock payable on March 20, 2014 to stockholders of record on March 17, 2014.

	On March 12, 2014, the Company announced that it had entered into purchase agreements with each of Global Asset Advisors, LLC ("GAA") and Top Third Ag Marketing LLC ("Top Third") providing for the purchase of 55% of the outstanding shares of GAA and Top Third from their major shareholders.

	The Company has evaluated events subsequent to December 31, 2013 to assess the need for potential recognition or disclosure in these consolidated financial statements. Such events were evaluated through March 17, 2014, the date these consolidated financial statements were issued.

Description_of_Business_and_Ba1

Description of Business and Basis of Presentation (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Error Correction	'
	In connection with the preparation of its Form 10-Q in the third quarter of 2013, the Company identified an error in the income tax provision and in the corresponding recognized tax assets and liabilities recorded in the year ended December 31, 2010. The Company considered guidance in ASC 250, including ASC 250-10-S99 SEC, formerly Staff Accounting Bulletin Release Topic 1.M, Materiality (“SAB 99”), and SEC Staff Accounting Bulletin Release Topic 1.N, Considering the Effect of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements (“SAB 108”), and concluded that the error did not constitute a material change to its previously issued consolidated financial statements. However, in order to accurately reflect the tax charge in the appropriate period, the Company has restated the Other assets, net, Income tax payable and Retained earnings balances as of December 31, 2012 to reflect the adjustment as if it had been made in the correct period.

	The table below describes the impact on the Consolidated Balance Sheet of the changes described above:


		As of December 31,
		Restated 2012	As reported 2012
	Other assets, net	17,153	17,804

	Income tax payable	1,481	1,275

	Retained earnings	84,772	85,629

	Previously, the Company presented certain acquisition expenses in "General and administrative". To provide greater transparency into these costs and enable easier comparison of operating performance, the Company has reclassified these costs to "Acquisition expense". The change in presentation has no effect on the total expenses.
Consolidation	'
	Consolidation
	The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and balances are eliminated in consolidation. The Company applies relevant accounting standards governing consolidations in determining its own principles of consolidation.
Use of Estimates	'
	Use of Estimates

	The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. In presenting the consolidated financial statements, management makes estimates regarding:

	•	Valuation of assets and liabilities requiring fair value estimates;

	•	The allowance for doubtful accounts;

	•	The realization of deferred taxes;

	•	The carrying amount of goodwill and other intangible assets;

	•	The amortization period of intangible assets and other long-lived assets with finite lives;

	•	Incentive based compensation accruals and valuation of share-based payment arrangements;

	•	Transfer pricing; and

	•	Other matters that affect the reported amounts and disclosure of contingencies in the consolidated financial statements.
	Estimates, by their nature, are based on judgment and available information. Therefore, actual results could differ from those estimates and could have a material impact on the consolidated financial statements, and it is possible that such changes could occur in the near term.
Revenue Recognition	'
	Revenue Recognition
	Revenue is recognized in accordance with revenue recognition guidance. The Company generates revenue from forex trading, metals trading, futures trading, Contracts-for-difference (“CFDs”) in markets which do not prohibit such transactions and other financial products. The Company categorizes revenue as Trading revenue, Commission revenue, Other revenue and Interest revenue.

	Trading revenue is generated from the bid/offer spread the Company offers its customers and any net gains and losses generated through changes in the market value of the currencies and other products held in the Company’s net exposure.

	Gains or losses are realized when customer transactions are liquidated. Unrealized gains or losses on trading positions are revalued at prevailing foreign currency exchange rates (the difference between contract price and market price) at the date of the balance sheet and are included in Receivables from banks and brokers as well as Payables to customers, brokers, dealers, FCMs and other regulated entities on the Consolidated Balance Sheets. Changes in net unrealized gains or losses are recorded in Trading revenue on the Consolidated Statements of Operations and Comprehensive Income.

	The Company receives Commission revenue for customers' use of its platform or services, without taking any market or credit risk. Commission revenue is determined by the volume of trades. Commission revenue has historically been comprised of revenue from our GTX business, revenue from our futures business, and revenue from GAIN Securities, our securities business. In October 2013, GAIN Securities transferred substantially all of its customer accounts to TradeKing, LLC. Since we acquired GFT in September 2013, we have also realized commission revenue from the sales trader business acquired from GFT. Our sales traders offer high-touch trading services to high net worth individuals.

	Other revenue, on the Consolidated Statements of Operations and Comprehensive Income, is comprised of account management, transaction, and performance fees related to customers who have assigned trading authority to the Company’s subsidiary Gain Capital Asset Management, (“GCAM”); inactivity and training fees charged to customer accounts; foreign currency transaction gains and losses and other miscellaneous items from each of our businesses.

	Interest revenue and interest expense are recorded when earned and incurred, respectively. Net interest (expense) revenue consists primarily of the revenue generated by Company cash and customer cash held and invested at banks, money market funds, in U.S. treasury bills, in Canadian Imperial Bank of Commerce (“CIBC”) treasury bills and on deposit as collateral with the Company’s wholesale forex trading partners, less interest paid to customers on their balances, interest expense on our term loan and revolver, interest expense on the amounts payable to dbFX per the terms of the asset acquisition and interest expense on our convertible senior notes.
Advertising	'
	Selling and marketing
	Selling and marketing costs are incurred for the production and communication of advertising, as well as other marketing activities.
Restructuring	'
	Restructuring expenses
	In 2013 and 2012, the Company incurred restructuring expenses, which reflected costs arising from headcount reductions and other exit costs, measured and disclosed in accordance with relevant accounting guidance.
Acquisition	'
	Acquisition expenses

	In 2013 and 2012, the Company incurred acquisition related expenses, which included non-recurring costs, such as legal, accounting, valuation and other costs specified in accounting guidance. These costs are expensed as incurred.

	Integration expenses

	In 2013, the Company incurred integration expenses, which are non-recurring acquisition related costs that do not meet the definition of acquisition costs specified in accounting guidance. These costs include incentive payments to employees to remain through the acquisition, as well as accelerated amortization of assets due to the consolidation of trading platforms, resulting from the GFT acquisition.
Cash and Cash Equivalents	'
	Cash and cash equivalents
	The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of acquisition to be cash equivalents. At December 31, 2013 and 2012, the Company’s cash and cash equivalents consisted of money market accounts and U.S. Treasury Bills with a maturity of 90 days or less. Cash equivalents are recorded at fair value.
Cash and Cash Securities Held for Customers	'
	Cash and securities held for customers
	Cash and securities held for customers represents cash held to fund customer liabilities in connection with trading positions. Included in this balance are funds deposited by customers and funds accruing to customers as a result of trades or contracts. The Company records a corresponding liability in connection with this amount in Payables to customers, brokers, dealers, FCMs and other regulated entities. A portion of the balance is not available for general use due to legal restrictions in accordance with certain jurisdictional regulatory requirements.
Short Term Investments	'
	Short Term Investments
	The Company considers all investments with an original maturity of less than one year short term investments. Short term investments consist of short-term certificates of deposit and CIBC treasury bills. All income from the certificates of deposit and treasury bills is recorded as interest income when earned.
Cost Method Investment	'
	Cost Method Investment
	In accordance with ASC 325-20, Cost Method Investments, the Company recognizes an investment in the stock of an investee as an asset, in Other assets, on the Consolidated Balance Sheets. Under the cost method of accounting for investments in common stock, dividends are the basis for recognition by the Company of earnings from the investment. The net accumulated earnings of an investee subsequent to the date of investment are recognized by the Company only to the extent distributed by the investee as dividends. Dividends received in excess of earnings subsequent to the date of investment are considered a return of investment and are recorded as reductions of cost of the investment.

Fair Value	'
	Fair Value
	The carrying amounts of assets, excluding goodwill and intangibles, and liabilities approximate their fair values due to the short term maturities. Some of the Company’s financial instruments are not measured at fair value on a recurring basis but nevertheless are recorded at amounts that approximate fair value. Such financial assets and liabilities include: cash, receivables from banks and brokers, other assets, payables to brokers, dealers, FCMs and other regulated entities, payables to customers and accrued expenses and other liabilities. These receivables and payables include open trading positions, hedging and customer respectively, which change in value as the price of the underlying product changes. The prices approximate the amounts at which the Company can settle the positions at the balance sheet date. The fair value of the convertible senior notes incorporates the unamortized discount and is assessed against prevailing interest rates.
Concentrations of Credit Risk	'
	Risk Management
	The Company offers its customers access to a diverse range of over 12,500 financial products, including foreign exchange, or forex, precious metals, “contracts for difference”, or CFDs, which are investment products with returns linked to the performance of underlying commodities, indices, individual equities, bonds and interest rate products, OTC options on forex, as well as futures and options on futures on more than 30 global exchange. In the United Kingdom, we also offer spread bets, which are investment products similar to CFDs, but that offer more favorable tax treatment for residents of that country. The Company actively trades currencies in the spot market, earning a dealer spread. The Company seeks to manage its market risk by generally entering into offsetting contracts in the interbank market, also on a margin basis. The Company deposits margin collateral with large money center banks and other major financial institutions. The Company is subject to credit risk or loss from counterparty nonperformance. The Company seeks to control the risks associated with its customers’ activities by requiring its customers to maintain margin collateral. The Company's trading platform does not allow customers to enter into trades if sufficient margin collateral is not on deposit with the Company.
	The Company developed risk-management systems and procedures that allow it to manage the market and credit risk associated with managed flow activities in real-time. The Company does not actively initiate directional market positions in anticipation of future movements in the relative prices of currencies and evaluates market risk exposure on a continuous basis. As a result of the Company’s hedging activities, the Company is likely to have open positions in various currencies at any given time. An additional component of the risk-management approach is that levels of capital are maintained in excess of those required under applicable regulations. The Company also maintains liquidity relationships with three established, global prime brokers and at least six other wholesale trading partners, providing the Company with access to a liquidity pool.
	Concentrations of Credit Risk
	Financial instruments that subject the Company to credit risk primarily consist of cash equivalents. The Company’s credit risk is managed by investing cash and cash equivalents primarily in high-quality money market and U.S. and Canadian Government instruments. The majority of the Company’s cash and cash equivalents are held at ten financial institutions.
	The Company also has credit risk related to receivables from banks and brokers.
Receivables from Banks and Brokers	'
	Receivables from Banks and Brokers
	The Company has posted funds with brokers as collateral as required by agreements for holding hedging positions. In addition, the Company has cash in excess of required collateral. These amounts are reflected as Receivables from banks and brokers on the Consolidated Balance Sheet and include gains or losses realized on liquidated contracts, as well as unrealized gains or losses on open positions.
Property and Equipment	'
	Property and Equipment
	Property and equipment are recorded at cost, net of accumulated depreciation. Identifiable significant improvements are capitalized and expenditures for maintenance and repairs are charged to expense as incurred.
	Property and equipment are depreciated on a straight-line basis over the estimated useful lives of the assets as follows:



	Software	3 years
	Computer equipment	3 years
	Furniture and fixtures	3 years
	Leasehold improvements	Shorter of lease term or estimated useful life
	Telephone equipment	3 years
	Office equipment	3 years
	Website development	3 years
	The Company accounts for costs incurred to develop its trading platform and related software in accordance with ASC 350-40, Intangible-Goodwill and Other-Internal-Use Software. ASC 350-40 requires that such technology be capitalized in the application and infrastructure development stages. Costs related to training, administration and non-value-added maintenance are charged to expense as incurred. Capitalized software development costs are being amortized over the useful life of the software, which the Company has estimated at three years.
Long Lived Assets	'
	Long-Lived Assets
	In accordance with ASC 360-10, Property, Plant and Equipment, the Company periodically evaluates the carrying value of long-lived assets when events and circumstances warrant such review. The carrying value of a long-lived asset is considered impaired when the anticipated undiscounted cash flow from such an asset is separately identifiable and is less than the carrying value. In that event, a loss is recognized in the amount by which the carrying value exceeds the fair market value of the long-lived asset. The Company has identified no such impairment losses.
Foreign Currencies	'
	*Foreign Currencies*
	Items included in the financial statements of each of the Company's entities are measured using the currency of the primary environment in which the entity operates ("the functional currency"). The Company has determined that its functional currency is U.S. dollars (“USD”). The Company’s Accumulated other comprehensive income, consists of foreign currency translation adjustments from subsidiaries not using the U.S. dollar as their functional currency.
	Foreign currency transactions are translated into functional currency using the exchange rates prevailing at the dates of the of the transactions. Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation at year end exchange rates of monetary assets and liabilities denominated in foreign currencies are recognized in Other revenue on the Consolidated Statements of Operations and Comprehensive Income.
Intangible Assets	'
	Intangible Assets
	Accounting guidance addressing intangible assets requires purchased intangible assets other than goodwill to be amortized over their useful lives unless their lives are determined to be indefinite. If the assets are determined to have a finite life in the future, the Company will amortize the carrying value over the remaining useful life at that time.
	The Company compares the recorded value of its indefinite lived intangible assets to their fair value on an annual basis and whenever circumstances arise that indicate that an impairment may have occurred. This qualitative assessment indicated that it is more likely than not that our indefinite lived intangible assets are not impaired. See Note 3 for additional information.
Goodwill	'
	Goodwill
	In accordance with relevant guidance, the Company tests goodwill for impairment on an annual basis during the fourth quarter and on an interim basis when conditions indicate impairment has occurred. Goodwill impairment is determined by comparing the estimated fair value of the reporting unit with its respective book value. At the date of the latest test, in the fourth quarter of 2013, the fair value of the reporting unit was significantly in excess of its book value. See Note 3 for additional information.
Other Assets	'
	Other Assets
	The Company recorded receivables from vendors, security deposits, current and deferred tax assets and miscellaneous receivables in Other assets on the Consolidated Balance Sheets. See Note 3 for additional information.
Derivatives	'
	Derivatives
	Forex, metals, and CFDs allow for exchanging the difference in value of a particular asset such as stock index, energy product, or gold contracts, between the time at which a contract is opened and the time at which it is closed. The company's retail customer open positions are considered derivatives under derivatives accounting guidance. Therefore, they are accounted for at fair value, as included in Receivables from banks and brokers and Payables to customers, brokers, dealers, FCMs and other regulated entities in the consolidated balance sheets.
Allowance For Doubtful Accounts	'
	Allowance for Doubtful Accounts
	The Company records an increase in the allowance for doubtful accounts when the prospect of collecting a specific customer account balance becomes doubtful. Management specifically analyzes accounts receivable and historical bad debt experience when evaluating the adequacy of the allowance for doubtful accounts. Should any of these factors change, the estimates made by management will also change, which could affect the level of the Company’s future provision for doubtful accounts. The customer receivables, net of allowance for doubtful accounts, is included in Other assets on the Consolidated Balance Sheets. Receivables from customers are reserved for and recorded in Bad debt provision on the Consolidated Statements of Operations and Comprehensive Income.
Payables to Customers, Brokers, Dealers, FCMs and Other Regulated Entities	'
	Payables to Customers, Brokers, Dealers, FCMs and Other Regulated Entities
	Payables to customers, brokers, dealers, FCM's and other regulated entities, included on the Consolidated Balance Sheets, include amounts due on cash and margin transactions. These transactions include deposits, commissions and gains or losses arising from settled trades. The Payables to customers balance also reflects unrealized gains or losses arising from open positions in customer accounts. The Company engages in white label, or omnibus relationships, with other regulated financial institutions. The payables balance includes amounts deposited by these financial institutions in order for the Company to act as clearing broker. The payables balance includes deposits from all NFA registered entities.
Introducing broker fees	'
	Introducing broker fees
	Introducing brokers direct customers to the Company in return for a commission on each referred customer’s trading volume or a share of net revenue generated by each referred customer’s trading activity. Such fees are referred to as introducing broker fees and are recorded in Trading expenses and commissions in the Consolidated Statements of Operations and Comprehensive Income.
Income Taxes	'
	Income Taxes
	Income tax expense is provided for using the asset and liability method, under which deferred tax assets and liabilities are determined based upon the temporary differences between the financial statement and income tax bases of assets and liabilities using currently enacted tax rates. The Company operates a permanent reinvestment strategy, under which earnings derived from foreign business remain invested in the Company’s foreign subsidiaries. In accordance with ASC 740, the Company does not recognize domestic tax expense related to the permanently reinvested earnings. The Company has no plans to repatriate these earnings.
Share Based Payment	'
	Share Based Payment
	In accordance with stock compensation guidance, the Company recognizes expense for all share-based payments to employees, including grants of employee stock options as well as restricted stock units, in the Statements of Operations and Comprehensive Income based on their fair values. The Company estimates fair value using the Black Scholes model for stock options and market value on grant date for restricted stock units. For each type of award, the Company reduces expense by an estimated forfeiture rate. See Note 8 for additional share based payment disclosure.
Treasury Shares	'
	Treasury Shares
	In accordance with ASC 505-30, Equity - Treasury Stock, the Company treats the cost of acquired shares purchased as a deduction from shareholders’ equity and as a reduction of the total shares outstanding when calculating adjusted earnings per share.
Earnings Per Common Share	'
	Earnings Per Common Share
	Basic earnings per common share is calculated using the weighted average common shares outstanding during the year. Common equivalent shares from stock options and restricted stock awards, using the treasury stock method, are also included in the diluted per share calculations unless their effect of inclusion would be anti-dilutive.

Description_of_Business_and_Ba2

Description of Business and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Impact on Consolidated Balance Sheet	'
	The table below describes the impact on the Consolidated Balance Sheet of the changes described above:


		As of December 31,
		Restated 2012		As reported 2012
	Other assets, net	17,153		17,804

	Income tax payable	1,481		1,275

	Retained earnings	84,772		85,629

Estimated Useful Lives	'
	Property and equipment are depreciated on a straight-line basis over the estimated useful lives of the assets as follows:



	Software	3 years
	Computer equipment	3 years
	Furniture and fixtures	3 years
	Leasehold improvements	Shorter of lease term or estimated useful life
	Telephone equipment	3 years
	Office equipment	3 years
	Website development	3 years
	Property and equipment, including leasehold improvements and capitalized software development costs, consisted of the following as of (amounts in thousands):



		31-Dec-13			31-Dec-12
	Software	$	25,913		$	19,757

	Computer equipment	6,649			5,248

	Leasehold improvements	6,560			1,863

	Telephone equipment	714			725

	Office equipment	1,994			1,471

	Furniture and fixtures	1,108			241

	Web site development costs	626			654

		43,564			29,959

	Less: Accumulated depreciation and amortization	(26,446		)	(18,936		)
	Property and equipment, net	$	17,118		$	11,023

Allowance For Doubtful Accounts	'
	The allowance for doubtful accounts consisted of the following (amounts in thousands):


	Balance as of January 1, 2011	$	(74	)
	Addition to provision	(852		)
	Amounts written off	871

	Balance as of December 31, 2011	(55		)
	Addition to provision	(358		)
	Amounts written off	265

	Balance as of December 31, 2012	(148		)
	Addition to provision	(1,501		)
	Amounts written off	491

	Balance as of December 31, 2013	$	(1,158	)

Additional_Financial_Informati1

Additional Financial Information (Tables)	12 Months Ended
Additional Financial Information (Tables)	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following table presents the Company’s assets and liabilities that are measured at fair value on a recurring basis during the period and the related hierarchy levels (amounts in thousands):



		Fair Value Measurements on a Recurring Basis
		as of December 31, 2013
		Level 1				Level 2			Level 3			Total
	Financial Assets/(Liabilities):
	Money market accounts	$	21,019			$	—		$	—		$	21,019
	Money market accounts	$	21,019			$	—		$	—		$	21,019
	Open contracts and other positions	—				(9,904		)	—			(9,904		)
	Open contracts and other positions	—				(9,904		)	—			(9,904		)
	CIBC treasury bills	706				—			—			706
	CIBC treasury bills	706				—			—			706
	Certificates of deposit	82				—			—			82
	Certificates of deposit	82				—			—			82
	Investment in gold	120				—			—			120
	Investment in gold	120				—			—			120
	Customer and broker open contracts and other positions	—				129,224			—			129,224
	Customer and broker open contracts and other positions	—				129,224			—			129,224
	Total	$	21,927			$	119,320		$	—		$	141,247
	Total	$	21,927			$	119,320		$	—		$	141,247



		Fair Value Measurements on a Recurring Basis
		as of December 31, 2012
		Level 1				Level 2			Level 3			Total
	Financial Assets:
	Money market accounts	$	12,064			$	—		$	—		$	12,064
	Money market accounts	$	12,064			$	—		$	—		$	12,064
	Open contracts and other positions	810				—			—			810
	Open contracts and other positions	810				—			—			810
	U.S. treasury bills	29,998				—			—			29,998
	U.S. treasury bills	29,998				—			—			29,998
	CIBC treasury bills	1,355				—			—			1,355
	CIBC treasury bills	1,355				—			—			1,355
	Certificates of deposit	82				—			—			82
	Certificates of deposit	82				—			—			82
	Investment in gold	168				—			—			168
	Investment in gold	168				—			—			168
	Customer and broker open contracts and other positions	74,943				—			—			74,943
	Customer and broker open contracts and other positions	74,943				—			—			74,943
	Total	$	119,420			$	—		$	—		$	119,420
	Total	$	119,420			$	—		$	—		$	119,420
Carrying Value and Fair Value and Fair Value Hierarchy Category of Financial Instruments Not Measured at Fair Value in Condensed Consolidated Statements of Financial Condition	'


		As of December 31, 2013							Fair Value Measurements using:
		Carrying Value				Fair Value			Quoted Prices		Significant				Significant
									in Active		Observable				Unobservable
									Markets for		Inputs				Inputs
									Identical Assets		(Level 2)				(Level 3)
									(Level 1)
	Financial Assets:
	Receivables from banks and brokers	$	237,414			$	237,414		—		$	237,414			—
	Receivables from banks and brokers	$	237,414			$	237,414		—		$	237,414			—
	Financial Liabilities:
	Payables to customers, brokers, dealers, FCMs and other regulated entities	868,542				868,542			—		868,542				—
		868,542				868,542			—		868,542				—
	Convertible senior notes	$	65,360			$	64,372				$	64,372
	Convertible senior notes	$	65,360			$	64,372				$	64,372
	Accrued expense and other liabilities	$	20,000			$	20,000				$	20,000
	Accrued expense and other liabilities	$	20,000			$	20,000				$	20,000

		As of December 31, 2012							Fair Value Measurements using:
		Carrying Value				Fair Value			Quoted Prices		Significant				Significant
									in Active		Observable				Unobservable
									Markets for		Inputs				Inputs
									Identical Assets		(Level 2)				(Level 3)
									(Level 1)
	Financial Assets:
	Receivables from banks and brokers	$	88,938			$	88,938		—		$	88,938			—
	Receivables from banks and brokers	$	88,938			$	88,938		—		$	88,938			—
	Financial Liabilities:
	Payables to customers, brokers, dealers, FCMs and other regulated entities	$	371,368			$	371,368		—		$	371,368			—
		$	371,368			$	371,368		—		$	371,368			—
	Payable to dbFX	$	2,386			$	2,392		—		—				$	2,392
	Payable to dbFX	$	2,386			$	2,392		—		—				$	2,392
Receivable from Brokers	'
	Amounts receivable from banks and brokers consisted of the following as of (amounts in thousands):


		31-Dec-13				31-Dec-12
	Required collateral	$	148,731			$	47,595
	Required collateral	$	148,731			$	47,595
	Excess from futures broker - Restricted	4,575				—
	Excess from futures broker - Restricted	4,575				—
	Cash in excess of required collateral	84,108				41,343
	Cash in excess of required collateral	84,108				41,343
	Open positions	(9,904		)		810
	Open positions	(9,904		)		810
	Investment in spot gold	120				168
	Investment in spot gold	120				168
		$	227,630			$	89,916
		$	227,630			$	89,916
Fair Values of Derivative Instruments	'
	The table below represents the fair values of the Company’s derivative instruments reported within Receivables from banks and brokers and Payables to customers, brokers, dealers, FCMs and other regulated entities on the accompanying Consolidated Balance Sheet (amounts in thousands):



		December 31, 2013
		Gross amounts of				Gross amount of			Net amounts of
		assets for				liabilities for			assets/liabilities
		derivative open				derivative open			for derivative
		positions at fair				positions at fair			open positions at
		value				value			fair value
	Derivative Instruments:
	Foreign currency exchange contracts	$	152,326			$	47,631		$	104,695
	Foreign currency exchange contracts	$	152,326			$	47,631		$	104,695
	CFD contracts	50,169				45,735			4,434
	CFD contracts	50,169				45,735			4,434
	Metals contracts	16,485				6,294			10,190
	Metals contracts	16,485				6,294			10,190
	Total	$	218,980			$	99,660		$	119,320
	Total	$	218,980			$	99,660		$	119,320

		December 31, 2013
		Cash Collateral				Net amounts of			Net amounts of
						assets/liabilities			assets/liabilities
						for derivative			presented in the
						open positions at			balance sheet
						fair value
	Derivative Assets/Liabilities:
	Receivables from bank and brokers	$	237,414			$	(9,904	)	$	227,630
	Receivables from bank and brokers	$	237,414			$	(9,904	)	$	227,630
	Payables to customers, brokers, dealers, FCMs and other regulated entities	$	868,542			$	129,224		$	739,318
		$	868,542			$	129,224		$	739,318
Notional Values of Derivative Instruments	'
	The Company’s derivatives include different underlyings, which vary in price. Foreign exchange contracts typically have prices less than two dollars, while certain metals contracts and contracts for difference can be considerably higher priced. The table below represents the notional values of the Company’s derivative instruments reported within Receivables from banks and brokers and Payables to customers, brokers, dealers, FCMs and other regulated entities on the accompanying Consolidated Balance Sheet (amounts in thousands):


		December 31, 2013
		Total contracts in long positions			Total contracts in short positions
	Derivative Instruments:
	Foreign currency exchange contracts	3,031,742			4,000,937
	Foreign currency exchange contracts	3,031,742			4,000,937
	CFD contracts	514,058			19,201
	CFD contracts	514,058			19,201
	Metals contracts	1,069			680
	Metals contracts	1,069			680
	Total	3,546,869			4,020,818
	Total	3,546,869			4,020,818
Net Gains (Losses) With Respect to Derivative Instruments Which are Reflected in Trading Revenue	'
	Net gains/(losses) with respect to derivative instruments reflected in Trading Revenue in the accompanying Consolidated Statements of Operations and Comprehensive Income for the twelve months ended December 31, 2013 were as follows (amounts in thousands):



	Derivative Instruments:
	Foreign currency exchange contracts	$	130,668
	Foreign currency exchange contracts	$	130,668
	CFD contracts	21,162
	CFD contracts	21,162
	Metals contracts	53,303
	Metals contracts	53,303
	Total	$	205,133
	Total	$	205,133
Property and Equipment Including Leasehold Improvements and Capitalized Software Development Costs	'
	Property and equipment are depreciated on a straight-line basis over the estimated useful lives of the assets as follows:



	Software	3 years
	Computer equipment	3 years
	Furniture and fixtures	3 years
	Leasehold improvements	Shorter of lease term or estimated useful life
	Telephone equipment	3 years
	Office equipment	3 years
	Website development	3 years
	Property and equipment, including leasehold improvements and capitalized software development costs, consisted of the following as of (amounts in thousands):



		31-Dec-13				31-Dec-12
	Software	$	25,913			$	19,757
	Software	$	25,913			$	19,757
	Computer equipment	6,649				5,248
	Computer equipment	6,649				5,248
	Leasehold improvements	6,560				1,863
	Leasehold improvements	6,560				1,863
	Telephone equipment	714				725
	Telephone equipment	714				725
	Office equipment	1,994				1,471
	Office equipment	1,994				1,471
	Furniture and fixtures	1,108				241
	Furniture and fixtures	1,108				241
	Web site development costs	626				654
	Web site development costs	626				654
		43,564				29,959
		43,564				29,959
	Less: Accumulated depreciation and amortization	(26,446		)		(18,936		)
	Property and equipment, net	$	17,118			$	11,023
	Property and equipment, net	$	17,118			$	11,023
Intangible Assets	'
	The Company's various finite-lived intangible assets consisted of the following as of (amounts in thousands):


		31-Dec-13							31-Dec-12
		Cost				Accumulated			Cost			Accumulated
		Cost				Amortization			Cost			Amortization
	Customer list	$	21,556			$	(13,594	)	$	19,356		$	(12,138	)
	Customer list	$	21,556			$	(13,594	)	$	19,356		$	(12,138	)
	Technology	26,930				(910		)	1,560			(37		)
	Technology	26,930				(910		)	1,560			(37		)
	Trademark	650				(173		)	430			(14		)
	Trademark	650				(173		)	430			(14		)
	Non-compete agreement	1,859				(1,852		)	1,859			(1,510		)
	Non-compete agreement	1,859				(1,852		)	1,859			(1,510		)
		$	50,995			$	(16,529	)	$	23,205		$	(13,699	)
		$	50,995			$	(16,529	)	$	23,205		$	(13,699	)
Finite-lived Intangible Assets	'


	Balance at January 1, 2011	$	9,089
	Balance at January 1, 2011	$	9,089
	Purchase of dbFX Customer assets and non-compete	9,701
	Purchase of dbFX Customer assets and non-compete	9,701
	Amortization and foreign currency transaction gains/losses	(8,019		)
	Balance at December 31, 2011	$	10,771
	Balance at December 31, 2011	$	10,771
	Customer list acquired in acquisition of OEC	1,580
	Customer list acquired in acquisition of OEC	1,580
	Trademark acquired	430
	Trademark acquired	430
	Technology acquired	1,560
	Technology acquired	1,560
	Amortization and foreign currency transaction gains/losses	(4,473		)
	Balance at December 31, 2012	$	9,868
	Balance at December 31, 2012	$	9,868
	Technology acquired	25,300
	Technology acquired	25,300
	Customer list acquired	3,150
	Customer list acquired	3,150
	Finalization in fair value of OEC intangibles (1)	(660		)
	Amortization and foreign currency transaction gains/losses	(2,830		)
	Balance at December 31, 2013	34,828
	Balance at December 31, 2013	34,828
	(1) To finalize its valuation of OEC acquisition intangibles, the Company reduced the intangibles by $0.7 million, with a corresponding adjustment to goodwill
Schedule of Expected Future Amortization Expense	'
	Future annual estimated amortization expense for the next five years is as follows (amounts in thousands):


	Years Ended December 31:
	2014	4,823
	2014	4,823
	2015	4,823
	2015	4,823
	2016	4,823
	2016	4,823
	2017	3,963
	2017	3,963
	2018	3,213
	2018	3,213
Other Assets	'
	Other assets consisted of the following as of (amounts in thousands):


		31-Dec-13				31-Dec-12
	Vendor and security deposits	$	3,344			$	3,647
	Vendor and security deposits	$	3,344			$	3,647
	Current tax receivable	4,547				4,898
	Current tax receivable	4,547				4,898
	Deferred tax assets	4,922				5,619
	Deferred tax assets	4,922				5,619
	Investment in Kapitall, Inc.	50				500
	Investment in Kapitall, Inc.	50				500
	Indemnification asset	8,596				—
	Indemnification asset	8,596				—
	GTX Trade Receivables	4,704				1,335
	GTX Trade Receivables	4,704				1,335
	Miscellaneous receivables, net	2,446				1,154
	Miscellaneous receivables, net	2,446				1,154
		$	28,609			$	17,153
		$	28,609			$	17,153

Acquisition_Tables

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2013
Business Acquisition [Line Items]	'
Unaudited Pro Forma Income Statement Line Items	'
	Unaudited pro forma income statement line items for the twelve months ended December 31, 2013 and 2012, were as follows (amounts in thousands):


		For the Twelve Months Ended December 31,
		2013			2012

	REVENUE:	$	355,489		$	256,114

	Total non-interest revenue	$	355,489		$	256,114

	Interest revenue	927			1,118

	Interest expense	1,865			993

	Total net interest (expense) / revenue	(938		)	125

	Net revenue	354,551			256,239

	EXPENSES:

	Other expense items (1)	299,658			269,704

	Depreciation and amortization	11,012			8,354

	Purchased intangible amortization	5,157			7,488

	Acquisition expense	1,824			85

	Restructuring	1,570			634

	Integration	1,950			—

	Total	321,172			286,263

	INCOME / (LOSS) BEFORE INCOME TAX EXPENSE	33,379			(30,024		)

	Income tax expense / (benefit)	12,517			(11,259		)

	Net income / (loss)	$	20,862		$	(18,765	)


	(1) Other expenses items for the year ended December 31, 2013, included a one-time, non-recurring expense of $5.1
	million relating to a GFT accrual for certain liabilities to third parties.
Schedule of Restructuring Costs	'


		For the Twelve Months Ended December 31,
		2013
	Restructuring liability as of January 1, 2013	—

	2013 restructuring expenses	1,570

	Payments made in 2013	986

	Liability as of December 31, 2013	584

Global Futures & Forex Ltd	'
Business Acquisition [Line Items]	'
Preliminary Purchase Price	'
	The preliminary purchase price of GFT was derived as follows (amounts in thousands):



	Cash	$	40,000

	Payment for excess cash adjustment	2,160

	Loan payable	33,200

	Common Stock issued	34,771

	Total purchase price	$	110,131

Preliminary Purchase Price Allocated to the Fair Value of Assets and Liabilities	'
	The preliminary purchase price of GFT was allocated to the fair value of various assets and liabilities as follows (amounts in thousands):



	Cash and cash equivalents acquired	$	15,781

	Cash and cash equivalents held for customers acquired	228,419

	Receivable from brokers	61,028

	Property and equipment	7,515

	Other current assets	15,002

	Total tangible assets	327,745

	Total liabilities assumed	250,833

	Net assets	76,912

	Consideration less net assets	33,219

	Identifiable intangible assets:
	Software	25,300

	Customer relationships	3,150

	Intangible assets, net	28,450

	Goodwill	4,769

Open E Cry Limited Liability Company	'
Business Acquisition [Line Items]	'
Preliminary Purchase Price	'
	The purchase price of OEC was derived as follows (amounts in thousands):


	Cash paid	$	12,000

	Working capital adjustment	2,691

	Total purchase price	$	14,691

Preliminary Purchase Price Allocated to the Fair Value of Assets and Liabilities	'
	The purchase price of OEC was allocated to the fair value of various assets and liabilities as follows (amounts in thousands):


	Cash and cash equivalents acquired	$	5,187

	Cash and securities held for customers acquired	109,042

	Receivables from brokers acquired	815

	Other assets acquired	98

	Total tangible assets acquired	$	115,142

	Total liabilities assumed	(109,960		)
	Identifiable intangible assets:
	Trademark	650

	Technology	1,630

	Customer relationships	630

	Goodwill	6,599

Convertible_Senior_Notes_Table

Convertible Senior Notes (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Schedule of Liability and Equity Components of Convertible Debt	'
	The balances of the liability and equity components as of December 31, 2013, were as follows, with amounts in thousands:



		December 31,

		2013

	Liability component - principal	$	80,000

	Deferred bond discount	(14,640		)
	Liability component - net carrying value	$	65,360


	Additional paid in capital	$	12,572

	Discount attributable to equity	(425		)
	Equity component	$	12,147

Schedule of Interest Expense	'
	Interest expense related to the Convertible Notes, included in Interest on borrowings in the condensed consolidated statements of operations was as follows, with amounts in thousands:



		Twelve Months Ended

		December 31,

		2013

	Interest expense - stated coupon rate	$	275

	Interest expense - amortization of deferred bond discount and costs	213

	Total interest expense - convertible note	$	488

Share_Based_Compensation_Table

Share Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Stock Option Activity Under All plans	'
	The following table summarizes the stock option activity under all plans from January 1, 2013 through December 31, 2013:



			Options Outstanding
											Weighted
							Weighted				Average
			Number of				Average				Remaining		Aggregate
			Options				Exercise Price				Life (Years)		Intrinsic Value
	Outstanding January 1, 2013		3,588,900				$	2.32			1.09

	Granted		496,000				$	5.3			6.17

	Exercised		(1,394,977		)		$	1.83			1.99

	Forfeited		(66,798		)		$	4.85			7.84

	Outstanding December 31, 2013		2,623,125				$	4.1			4.6		9,111,804

	Vested and expected to vest options		2,554,173				$	4.07			4.18		8,929,214

	Exercisable, December 31, 2013		1,614,240				$	3.51			3.92		6,535,178


	Fair market value of common stock at exercise date		$	7,279,641

	Cost to exercise		2,538,979

	Net value of Stock options exercised		$	4,740,662

Summary of Outstanding and Exercisable Stock Options	'
	The following table summarizes information concerning outstanding and exercisable stock options as of December 31, 2013:


			Options Outstanding									Options Exercisable
										Weighted
										Average
						Weighted				Remaining		Number of		Weighted
			Number			Average				Contractual		Options		Average
	Exercise Price		Outstanding			Exercise Price				Life (Years)		Exercisable		Exercise Price
	$1.11		11,660			1.11				0.42		11,660		1.11

	$1.55		374			1.55				1.02		374		1.55

	$1.99		462,488			1.99				1.41		462,488		1.99

	$2.43		262,161			2.43				1.86		262,161		2.43

	$2.87		38,135			2.87				1.81		38,135		2.87

	$3.83		767,574			3.83				6.31		603,526		3.83

	$4.40		481,000			4.4				8.9		—		—

	$5.30		293,563			5.3				7.86		78,312		5.3

	$8.02		306,170			8.02				6.94		157,584		8.02

			2,623,125			$	4.1			4.6		1,614,240		$	3.51

Assumptions For Stock Options Granted	'
	The Compensation Committee of the Company's Board of Directors approved stock option grants with a fair market value estimated under a Black-Scholes option pricing valuation model using the following assumptions:



		For the Twelve Months Ended December 31,
		2013		2012		2011
	Valuation Assumptions
	Risk-free rate	0.80%		0.90%		2.30%
	Expected volatility	48.80%		48.50%		47.60%
	Expected term (years)	4.8 years		4.8 years		4.8 years
	Dividend yield	4.90%		4.90%		—%
Summary of Nonvested Shares of Restricted Stock Units and Restricted Stock Awards	'
	A summary of the status of the Company’s nonvested shares of restricted stock units and restricted stock awards as of December 31, 2013 and changes during the year ended December 31, 2013, is presented below:



					Weighted Average							Weighted Average
		Number			Grant Date				Number			Grant Date
	Non-Vested Shares	of RSUs			Fair Value				of RSAs			Fair Value
	Non-vested at January 1, 2013	586,096			$	5.8			181,888			$	7.2

	Granted	812,442			4.4				—			—

	Vested	(276,466	)		6				(63,220	)		7.22

	Forfeited	(92,677	)		4.75				(7,229	)		6.71

	Non-vested at December 31, 2013	1,029,395			$	4.7			111,439			$	7.28

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Computation of Earnings Per Share	'
	The following table sets forth the computation of earnings per share (amounts in thousands except share and per share data):



		For the years ended December 31,

		2013			2012		2011

	Net income applicable to GAIN Capital Holdings, Inc.	$	31,311		$	2,621	$	15,698

	Series E correction(1)	(154		)	—		—

	Net income after correction	31,157			2,621		15,698

	Weighted average common shares outstanding:

	Basic weighted average common shares outstanding	36,551,246			34,940,800		34,286,840

	Effect of dilutive securities:

	Warrants	—			—		160,529

	Stock options	1,214,370			1,490,089		2,732,302

	RSUs/RSAs	1,867,262			1,449,319		1,802,121

	Diluted weighted average common shares outstanding	39,632,878			37,880,208		38,981,792

	Earnings per common share

	Basic	$	0.85		$	0.08	$	0.46

	Diluted	$	0.79		$	0.07	$	0.4



	-1	During the period an adjustment to retained earnings was made, reflecting the amounts deemed uncollectible associated with previously issued preferred stock, which was converted to common stock immediately prior to the IPO.

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Future Annual Minimum Lease Payments	'
	Future annual minimum lease payments, including maintenance and management fees, for non-cancellable operating leases, are as follows (amounts in thousands):


	Years Ended December 31:
	2014	$	4,193

	2015	3,550

	2016	2,838

	2017	2,045

	2018 and beyond	9,258

		$	21,884

INCOME_TAXES_Income_Taxes_Tabl

INCOME TAXES Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Components of Income from Continuing Operations Before Income Tax Expense	'
	The following table presents the U.S. and non-U.S. components of income before income tax expense / (benefit) for the years ended December 31, 2013, 2012, and 2011 (amounts in thousands):


		For the Fiscal Year Ended
		December 31,
		2013				2012				2011
	U.S.	$	17,375			$	(10,795	)		$	9,766

	Non-U.S.	27,730				11,937				13,478

		$	45,105			$	1,142			$	23,244

Provision for Income Tax Expense Benefit	'
	The provision for income tax expense / (benefit) consisted of (amounts in thousands):



		For the Fiscal Year Ended
		December 31,
		2013				2012				2011
	Current
	Federal	$	6,651			$	(2,880	)		$	4,803

	State	170				34				1,453

	UK	6,917				2,750				3,396

	Japan	14				14				—

	Other non-U.S.	3				3				1

		13,755				(79		)		9,653

	Deferred
	Federal	(565		)		(865		)		(1,953		)
	State	328				(1		)		(338		)

	Japan	121				126				184

	Other non-U.S.	(235		)		(30		)		—

	Change in valuation allowance	390				(630		)		—

		39				(1,400		)		(2,107		)

	Total income tax expense / (benefit)	$	13,794			$	(1,479	)		$	7,546

Components of Company Deferred Tax Assets and Liabilities	'
	Significant components of the Company’s deferred tax assets and liabilities were as follows (amounts in thousands):


		December 31,
		2013				2012
	Deferred tax assets
	Net foreign exchange operating losses	$	2,006			$	1,893

	Stock-based compensation expense	6,334				6,608

	Intangible assets	2,777				3,414

	Other	942				588

	Total deferred tax assets	12,059				12,503

	Valuation allowance	(493		)		(103		)
	Total deferred tax assets after valuation allowance	$	11,566			$	12,400


	Deferred tax liabilities
	Unrealized trading differences	$	(5,653	)		$	(4,867	)
	Unrealized foreign currency	—				(152		)

	Basis difference in property and equipment	(333		)		(1,546		)
	State taxes	(26		)		(78		)
	Other	(632		)		(138		)
	Total deferred liabilities	(6,644		)		(6,781		)
	Net deferred tax assets	$	4,922			$	5,619

Reconciles Provision to United States Federal Statutory Income Tax Rate	'
	The following table reconciles the provision to the U.S. federal statutory income tax rate:


		2013			2012			2011
	Federal income tax at statutory rate	35	%		35	%		35	%
	Increase/(decrease) in taxes resulting from:
	State income tax	0.75	%		2.47	%		3.06	%
	Foreign rate differential	(6.45	)%		(121.09	)%		(4.24	)%
	Meals & entertainment	0.16	%		5.65	%		0.4	%
	R&D credit	—	%		7.47	%		(0.7	)%
	Establishment/(release) of valuation allowance	0.87	%		(51.34	)%		—	%
	Uncertain tax positions	(0.05	)%		(9.04	)%		—	%
	Other permanent differences	0.3	%		1.46	%		(1.06	)%
	Effective Tax Rate	30.58	%		(129.42	)%		32.46	%
Gross Unrecognized Tax Benefits from Uncertain Tax Positions	'
	The following table summarizes the activity to the gross unrecognized Tax benefits from uncertain tax positions (amounts in thousands):


		As of December 31,

		2013				2012				2011

	Beginning balance as of January 1	$	78			$	189			$	126

	Increases based on tax positions related to the current period	—				3				39

	Increases based on tax positions related to prior periods	—								56

	Decreases based on tax positions related to prior periods	(21		)		(20		)		—

	Decreases related to a lapse of applicable statute of limitations	—				(94		)		(32		)

	Ending balance as of December 31	$	57			$	78			$	189

Regulatory_Requirements_Tables

Regulatory Requirements (Tables)	12 Months Ended
	Dec. 31, 2013
Banking and Thrift [Abstract]	'
Minimum Regulatory Capital Subsidiaries Required to Maintain	'
	The following table illustrates the minimum regulatory capital our subsidiaries were required to maintain as of December 31, 2013 and the actual amounts of capital that were maintained (amounts in millions):



	Entity Name	Minimum Regulatory Capital Requirements		Capital Levels Maintained		Excess Net Capital		Percent of Requirement Maintained
	GFT Global Markets UK Ltd.	$	32.3	$	57.2	$	24.9	177	%

	GAIN Capital Group, LLC	24.6		39.1		14.5		159	%

	GAIN Capital-Forex.com U.K., Ltd.	20.5		57.5		37		280	%

	Forex.com Japan Co., Ltd.	3.1		9.5		6.4		306	%

	GAIN Capital-Forex.com Hong Kong, Ltd.	1.9		3.8		1.9		200	%

	Global Futures & Forex, Ltd.	1		9		8		900	%

	GAIN Capital Forex.com Australia, Pty. Ltd.	0.3		2.6		2.3		867	%

	GAIN Capital-Forex.com Canada Ltd.	0.2		2		1.8		1,000	%

	GAIN Capital Securities, Inc.	0.1		0.5		0.4		500	%

	GAIN Global Markets, Inc.	0.1		0.3		0.2		300	%

	GFT Global Markets Asia Pte., Ltd.	1.6		1.7		0.1		106	%

	Total	$	85.7	$	183.2	$	97.5	214	%

Quarterly_Financial_Data_Unaud1

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Financial Data	'
	The following table sets forth selected quarterly financial data for 2013 and 2012 (in thousands, except per share data):


		First			Second		Third		Fourth
		Quarter			Quarter		Quarter		Quarter
	For the Year Ended December 31, 2013
	Gross revenue	$	49,754		$	72,833	$	60,571	$	83,801

	Net revenue	$	49,765		$	72,995	$	60,598	$	83,033

	Income before income tax expense	$	5,140		$	24,433	$	8,643	$	6,889

	Net income	$	4,279		$	17,164	$	5,600	$	4,268

	Basic net income per share	$	0.12		$	0.48	$	0.16	$	0.11

	Diluted net income per share	$	0.11		$	0.44	$	0.14	$	0.1


	For the Year Ended December 31, 2012
	Gross revenue	$	33,309		$	45,721	$	39,908	$	32,286

	Net revenue	$	33,246		$	45,684	$	39,985	$	32,445

	(Loss) / income before income tax expense	$	(1,859	)	$	5,988	$	4,431	$	(7,418	)

	Net (loss) / income	$	(1,247	)	$	4,435	$	3,221	$	(3,787	)

	Basic net (loss) / income per share	$	(0.04	)	$	0.13	$	0.09	$	(0.11	)

	Diluted net (loss) / income per share	$	(0.04	)	$	0.11	$	0.08	$	(0.11	)

Recovered_Sheet1

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]	'	'	'
Advertising Expense	$22,300,000	$27,000,000	$36,200,000
Foreign currency gain (loss)	($3,641,000)	($1,315,000)	$145,000

Recovered_Sheet2

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION - Impact on Balance Sheet (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other assets, net	$28,609	$17,153
Income tax payable	3,803	1,481
Retained earnings	108,603	84,772
As reported	'	'
Other assets, net	'	17,804
Income tax payable	'	1,275
Retained earnings	'	$85,629

Recovered_Sheet3

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION - Concentration Risk (Details) (Credit Concentration Risk [Member], Accounts Receivable [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Credit Concentration Risk [Member] \| Accounts Receivable [Member]	'	'
Concentration Risk [Line Items]	'	'
Percentage of revenue from a single customer	20.00%	52.00%

DESCRIPTION_OF_BUSINESS_AND_BA3

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION - Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2013
Software	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'3 years
Computer equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'3 years
Furniture and fixtures	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'3 years
Telephone equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'3 years
Office equipment	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'3 years
Website development	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'3 years
Software development	'
Property, Plant and Equipment [Line Items]	'
Estimated useful lives	'3 years

DESCRIPTION_OF_BUSINESS_AND_BA4

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION - Allowance for Doubtful Accounts (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable [Roll Forward]	'	'	'
Beginning balance	($148)	($55)	($74)
Addition to provision	-1,501	-358	-852
Amounts written off	491	265	871
Ending balance	($1,158)	($148)	($55)

DESCRIPTION_OF_BUSINESS_AND_BA5

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION - Risk Management (Details)	Dec. 31, 2013
	counterparty
Global Prime Brokers	'
Derivative [Line Items]	'
Liquidity relationships, number of counterparties	3
Forex Trading Partners	'
Derivative [Line Items]	'
Liquidity relationships, number of counterparties	6

Recovered_Sheet4

ADDITIONAL FINANCIAL INFORMATION - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	$141,247	$119,420
Money market accounts	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	21,019	12,064
Open contracts and other positions	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	'	810
Liabilities	-9,904	'
U.S. treasury bills	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	'	29,998
Canadian Imperial Bank of Commerce treasury bills	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	706	1,355
Certificates of deposit	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	82	82
Investment in gold	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	120	168
Customer and broker open contracts and other positions	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	129,224	74,943
Quoted Prices in Active Markets for Identical Assets (Level 1)	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	21,927	119,420
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market accounts	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	21,019	12,064
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Open contracts and other positions	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	'	810
Liabilities	0	'
Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. treasury bills	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	'	29,998
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Canadian Imperial Bank of Commerce treasury bills	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	706	1,355
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Certificates of deposit	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	82	82
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Investment in gold	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	120	168
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Customer and broker open contracts and other positions	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	74,943
Significant Observable Inputs (Level 2)	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	119,320	0
Significant Observable Inputs (Level 2) \| Money market accounts	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Observable Inputs (Level 2) \| Open contracts and other positions	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	'	0
Liabilities	-9,904	'
Significant Observable Inputs (Level 2) \| U.S. treasury bills	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	'	0
Significant Observable Inputs (Level 2) \| Canadian Imperial Bank of Commerce treasury bills	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Observable Inputs (Level 2) \| Certificates of deposit	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Observable Inputs (Level 2) \| Investment in gold	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Observable Inputs (Level 2) \| Customer and broker open contracts and other positions	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	129,224	0
Significant Unobservable Inputs (Level 3)	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Unobservable Inputs (Level 3) \| Money market accounts	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Unobservable Inputs (Level 3) \| Open contracts and other positions	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	'	0
Liabilities	0	'
Significant Unobservable Inputs (Level 3) \| U.S. treasury bills	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	'	0
Significant Unobservable Inputs (Level 3) \| Canadian Imperial Bank of Commerce treasury bills	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Unobservable Inputs (Level 3) \| Certificates of deposit	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Unobservable Inputs (Level 3) \| Investment in gold	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	0	0
Significant Unobservable Inputs (Level 3) \| Customer and broker open contracts and other positions	'	'
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]	'	'
Assets	$0	$0

Recovered_Sheet5

ADDITIONAL FINANCIAL INFORMATION - Carrying Value and Fair Value and Fair Value Hierarchy Category of Financial Instruments Not Measured at Fair Value in Condensed Consolidated Statements of Financial Condition (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financial Assets:	'	'
Receivables from banks and brokers	$227,630	$89,916
Financial Liabilities:	'	'
Payables to customers, brokers, dealers, FCMs and other regulated entities	739,318	446,311
Convertible senior notes	65,360	0
Significant Observable Inputs (Level 2)	'	'
Financial Assets:	'	'
Receivables from banks and brokers	237,414	88,938
Financial Liabilities:	'	'
Payables to customers, brokers, dealers, FCMs and other regulated entities	868,542	371,368
Convertible senior notes	64,372	'
Accrued Liabilities, Current	20,000	'
Significant Unobservable Inputs (Level 3)	'	'
Financial Liabilities:	'	'
Payable to dbFX	'	2,392
Carrying Value	'	'
Financial Assets:	'	'
Receivables from banks and brokers	237,414	88,938
Financial Liabilities:	'	'
Payables to customers, brokers, dealers, FCMs and other regulated entities	868,542	371,368
Payable to dbFX	'	2,386
Convertible senior notes	65,360	'
Accrued Liabilities, Current	20,000	'
Fair Value	'	'
Financial Assets:	'	'
Receivables from banks and brokers	237,414	88,938
Financial Liabilities:	'	'
Payables to customers, brokers, dealers, FCMs and other regulated entities	868,542	371,368
Payable to dbFX	'	2,392
Convertible senior notes	64,372	'
Accrued Liabilities, Current	$20,000	'

ADDITIONAL_FINANCIAL_INFORMATI2

ADDITIONAL FINANCIAL INFORMATION - Receivable from Brokers (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Receivables from Brokerage Clients [Line Items]	'	'
Receivable from banks and brokers	$227,630	$89,916
Required collateral	'	'
Receivables from Brokerage Clients [Line Items]	'	'
Receivable from banks and brokers	148,731	47,595
Excess from futures broker - restricted	'	'
Receivables from Brokerage Clients [Line Items]	'	'
Receivable from banks and brokers	4,575	0
Cash in excess of required collateral	'	'
Receivables from Brokerage Clients [Line Items]	'	'
Receivable from banks and brokers	84,108	41,343
Open Position	'	'
Receivables from Brokerage Clients [Line Items]	'	'
Receivable from banks and brokers	-9,904	810
Investment in spot gold	'	'
Receivables from Brokerage Clients [Line Items]	'	'
Receivable from banks and brokers	$120	$168

ADDITIONAL_FINANCIAL_INFORMATI3

ADDITIONAL FINANCIAL INFORMATION - Fair Values of Derivative Instruments (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]	'	'
Gross amounts of assets for derivative open positions at fair value	$218,980	'
Gross amounts of liability for derivative open positions at fair value	99,660	'
Net amounts of assets/liabilities for derivative open positions at fair value	119,320	'
Net amounts of assets/liabilities presented in the balance sheet	227,630	89,916
Net amounts of assets/liabilities presented in the balance sheet	739,318	446,311
Derivative Assets	'	'
Derivatives, Fair Value [Line Items]	'	'
Cash Collateral	237	'
Net amounts of assets/liabilities for derivative open positions at fair value	-10	'
Net amounts of assets/liabilities presented in the balance sheet	227,630	'
Derivative Liabilities	'	'
Derivatives, Fair Value [Line Items]	'	'
Cash Collateral	869	'
Net amounts of assets/liabilities for derivative open positions at fair value	129	'
Foreign Exchange Contract [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross amounts of assets for derivative open positions at fair value	152,326	'
Gross amounts of liability for derivative open positions at fair value	47,631	'
Net amounts of assets/liabilities for derivative open positions at fair value	104,695	'
CFD contracts	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross amounts of assets for derivative open positions at fair value	50,169	'
Gross amounts of liability for derivative open positions at fair value	45,735	'
Net amounts of assets/liabilities for derivative open positions at fair value	4,434	'
Metal contracts	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross amounts of assets for derivative open positions at fair value	16,485	'
Gross amounts of liability for derivative open positions at fair value	6,294	'
Net amounts of assets/liabilities for derivative open positions at fair value	$10,190	'

ADDITIONAL_FINANCIAL_INFORMATI4

ADDITIONAL FINANCIAL INFORMATION - Notional Values of Derivative Instruments (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013
Notional amounts of derivative open long positions	'
Derivative [Line Items]	'
Notional amounts of derivative open long positions	$3,546,869
Notional amounts of derivative open long positions \| Foreign Exchange Contract [Member]	'
Derivative [Line Items]	'
Notional amounts of derivative open long positions	3,031,742
Notional amounts of derivative open long positions \| CFD contracts	'
Derivative [Line Items]	'
Notional amounts of derivative open long positions	514,058
Notional amounts of derivative open long positions \| Metal contracts	'
Derivative [Line Items]	'
Notional amounts of derivative open long positions	1,069
Notional amounts of derivative open short positions	'
Derivative [Line Items]	'
Notional amounts of derivative open long positions	4,020,818
Notional amounts of derivative open short positions \| Foreign Exchange Contract [Member]	'
Derivative [Line Items]	'
Notional amounts of derivative open long positions	4,000,937
Notional amounts of derivative open short positions \| CFD contracts	'
Derivative [Line Items]	'
Notional amounts of derivative open long positions	19,201
Notional amounts of derivative open short positions \| Metal contracts	'
Derivative [Line Items]	'
Notional amounts of derivative open long positions	$680

ADDITIONAL_FINANCIAL_INFORMATI5

ADDITIONAL FINANCIAL INFORMATION - Net Gains Losses with Respect to Derivative Instruments (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Derivative [Line Items]	'
Net gains (losses) on derivative instruments, total	$205,133
Foreign Exchange Contract [Member]	'
Derivative [Line Items]	'
Net gains (losses) on derivative instruments	130,668
CFD contracts	'
Derivative [Line Items]	'
Net gains (losses) on derivative instruments	21,162
Metal contracts	'
Derivative [Line Items]	'
Net gains (losses) on derivative instruments	$53,303

ADDITIONAL_FINANCIAL_INFORMATI6

ADDITIONAL FINANCIAL INFORMATION - Property and Equipment Including Leasehold Improvements and Capitalized Software Development Costs (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	$43,564	$29,959
Less: Accumulated depreciation and amortization	-26,446	-18,936
Property and equipment, net	17,118	11,023
Software	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	25,913	19,757
Computer equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	6,649	5,248
Leasehold improvements	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	6,560	1,863
Telephone equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	714	725
Office equipment	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	1,994	1,471
Furniture and fixtures	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	1,108	241
Website development costs	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment	$626	$654

ADDITIONAL_FINANCIAL_INFORMATI7

ADDITIONAL FINANCIAL INFORMATION - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2004	Dec. 31, 2003	Dec. 31, 2013	Sep. 24, 2013
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2004	Dec. 31, 2003	Global Futures & Forex Ltd	Global Futures & Forex Ltd
Additional Financial Information [Line Items]	'	'	'	'	'	'	'
Holdback Amount	$20,000,000	'	'	'	'	'	'
Domain name acquired amount	'	'	'	100,000	200,000	'	'
Reduction in intangibles due to finalization of valuation	660,000	'	'	'	'	'	'
Purchased intangible amortization	2,906,000	4,134,000	8,893,000	'	'	'	'
Depreciation and amortization expense	7,768,000	4,921,000	3,898,000	'	'	'	'
Goodwill	14,183,000	9,030,000	'	'	'	'	4,769,000
Increase in goodwill	4,800,000	400,000	'	'	'	'	'
Settlement of liabilities incurred prior to acquisition	'	'	'	'	'	8,600,000	'
Indemnification asset	$8,596,000	$0	'	'	'	'	'

ADDITIONAL_FINANCIAL_INFORMATI8

ADDITIONAL FINANCIAL INFORMATION - Definite-Lived Intangible Assets (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Intangible Assets by Major Class [Line Items]	'	'
Cost	$50,995	$23,205
Accumulated Amortization	-16,529	-13,699
Customer lists	'	'
Intangible Assets by Major Class [Line Items]	'	'
Cost	21,556	19,356
Accumulated Amortization	-13,594	-12,138
Technology	'	'
Intangible Assets by Major Class [Line Items]	'	'
Cost	26,930	1,560
Accumulated Amortization	-910	-37
Trademark	'	'
Intangible Assets by Major Class [Line Items]	'	'
Cost	650	430
Accumulated Amortization	-173	-14
Non-compete agreement	'	'
Intangible Assets by Major Class [Line Items]	'	'
Cost	1,859	1,859
Accumulated Amortization	($1,852)	($1,510)

ADDITIONAL_FINANCIAL_INFORMATI9

ADDITIONAL FINANCIAL INFORMATION - Acquired Intangible Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Finite-lived Intangible Assets [Roll Forward]	'		'	'
Beginning Balance	$9,868		'	'
Finite-Lived Intangible Assets, Purchase Accounting Adjustments	-660		'	'
Amortization of Intangible Assets	-2,906		-4,134	-8,893
Ending Balance	34,828		9,868	'
Series of Individually Immaterial Business Acquisitions [Member]	'		'	'
Finite-lived Intangible Assets [Roll Forward]	'		'	'
Beginning Balance	9,868		10,771	9,089
Finite-Lived Intangible Assets, Purchase Accounting Adjustments	-660	[1]	'	'
Amortization of Intangible Assets	-2,830		-4,473	-8,019
Ending Balance	34,828		9,868	10,771
Series of Individually Immaterial Business Acquisitions [Member] \| Customer assets and non-compete	'		'	'
Finite-lived Intangible Assets [Roll Forward]	'		'	'
Finite-lived Intangible Assets Acquired	'		'	9,701
Series of Individually Immaterial Business Acquisitions [Member] \| Customer lists	'		'	'
Finite-lived Intangible Assets [Roll Forward]	'		'	'
Finite-lived Intangible Assets Acquired	3,150		1,580	'
Series of Individually Immaterial Business Acquisitions [Member] \| Trademark	'		'	'
Finite-lived Intangible Assets [Roll Forward]	'		'	'
Finite-lived Intangible Assets Acquired	'		430	'
Series of Individually Immaterial Business Acquisitions [Member] \| Technology	'		'	'
Finite-lived Intangible Assets [Roll Forward]	'		'	'
Finite-lived Intangible Assets Acquired	$25,300		$1,560	'

[1]	To finalize its valuation of OEC acquisition intangibles, the Company reduced the intangibles by $0.7 million

Recovered_Sheet6

ADDITIONAL FINANCIAL INFORMATION - Future Amortization Expense (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
2014	$4,823
2015	4,823
2016	4,823
2017	3,963
2018	$3,213

Recovered_Sheet7

ADDITIONAL FINANCIAL INFORMATION - Other Assets (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 30, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 30, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'	'	'
Vendor and security deposits	$3,344	$3,647	'
Current tax receivable	4,547	4,898	'
Deferred tax assets	4,922	5,619	5,619
Investment in Kapitall, Inc.	50	500	'
Indemnification asset	8,596	0	'
GTX Trade Receivables	4,704	1,335	'
Miscellaneous receivables, net	2,446	1,154	'
Other assets, net	$28,609	$17,153	'

RELATED_PARTY_TRANSACTIONS_Add

RELATED PARTY TRANSACTIONS - Additional Information (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
In Millions, unless otherwise specified	Management	Management	Scivantage, Inc.
			board_member
Related Party Transaction [Line Items]	'	'	'
Payables to customers	$3	$2.40	'
Term of agreement	'	'	'1 year
Number of board of directors serving both companies	'	'	2

ACQUISITIONS_Additional_Inform

ACQUISITIONS - Additional Information (Details) (USD $)	12 Months Ended			0 Months Ended	3 Months Ended	12 Months Ended		0 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 24, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Jun. 27, 2013	Dec. 31, 2012
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Global Futures & Forex Ltd	Global Futures & Forex Ltd	Global Futures & Forex Ltd	Global Futures & Forex Ltd	Open E Cry Limited Liability Company	Open E Cry Limited Liability Company
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'
Acquisition expense	$1,824,000	$85,000	$0	'	'	$1,800,000	'	'	'
Revenue from acquiree from acquisition date	'	'	'	'	26,900,000	'	'	'	'
Expenses from acquiree from acquisition date	'	'	'	'	32,000,000	'	'	'	'
Loss before taxes from acquiree from acquisition date	'	'	'	'	5,100,000	'	'	'	'
Cash paid	'	'	'	40,000,000	'	'	'	12,000,000	2,700,000
Non-recurring expense	'	'	'	'	'	5,100,000	'	'	'
Restructuring	1,570,000	634,000	0	'	'	1,570,000	600,000	'	'
Expected restructuring cost to be recorded in 2014	'	'	'	'	'	$200,000	'	'	'

ACQUISITIONS_Schedule_of_Purch

ACQUISITIONS - Schedule of Purchase Price (Details) (USD $)	0 Months Ended		3 Months Ended
In Thousands, unless otherwise specified	Sep. 24, 2013	Jun. 27, 2013	Dec. 31, 2012
	Global Futures & Forex Ltd	Open E Cry Limited Liability Company	Open E Cry Limited Liability Company
Business Acquisition [Line Items]	'	'	'
Cash paid	$40,000	$12,000	$2,700
Payment for excess cash adjustment	2,160	'	'
Working capital adjustment	'	2,691	'
Loans Payable	33,200	'	'
Common Stock issued	34,771	'	'
Total purchase price	$110,131	$14,691	'

ACQUISITIONS_Allocation_of_Pur

ACQUISITIONS - Allocation of Purchase Price to Fair Value of Assets and Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Sep. 24, 2013	Sep. 24, 2013	Sep. 24, 2013	Jun. 27, 2012	Jun. 27, 2012	Jun. 27, 2012	Jun. 27, 2012
In Thousands, unless otherwise specified			Global Futures & Forex Ltd	Global Futures & Forex Ltd	Global Futures & Forex Ltd	Open E Cry Limited Liability Company	Open E Cry Limited Liability Company	Open E Cry Limited Liability Company	Open E Cry Limited Liability Company
				Software	Customer Relationships		Trademark	Technology	Customer Relationships
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'
Cash and cash equivalents acquired	'	'	$15,781	'	'	$5,187	'	'	'
Cash and securities held for customers acquired	'	'	228,419	'	'	109,042	'	'	'
Receivables from brokers acquired	'	'	61,028	'	'	815	'	'	'
Property and equipment	'	'	7,515	'	'	'	'	'	'
Other assets acquired	'	'	15,002	'	'	98	'	'	'
Total tangible assets acquired	'	'	327,745	'	'	115,142	'	'	'
Total liabilities assumed	'	'	250,833	'	'	109,960	'	'	'
Net assets	'	'	76,912	'	'	'	'	'	'
Consideration less net assets	'	'	33,219	'	'	'	'	'	'
Identified intangible assets	'	'	28,450	25,300	3,150	'	650	1,630	630
Goodwill	$14,183	$9,030	$4,769	'	'	$6,599	'	'	'

ACQUISITIONS_Pro_Forma_Revenue

ACQUISITIONS - Pro Forma Revenue and Net Income (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:	'	'	'	'	'	'	'	'	'	'	'
Revenues, Excluding Interest and Dividends	'	'	'	'	'	'	'	'	$266,959	$151,224	$182,335
Interest revenue	'	'	'	'	'	'	'	'	821	627	544
Interest Expense	'	'	'	'	'	'	'	'	1,389	491	1,414
Total net interest (expense) / revenue	'	'	'	'	'	'	'	'	-568	136	-870
EXPENSES:	'	'	'	'	'	'	'	'	'	'	'
Depreciation and amortization	'	'	'	'	'	'	'	'	7,768	4,921	3,898
Purchased intangible amortization	'	'	'	'	'	'	'	'	2,906	4,134	8,893
Acquisition expense	'	'	'	'	'	'	'	'	1,824	85	0
Restructuring	'	'	'	'	'	'	'	'	1,570	634	0
Integration	'	'	'	'	'	'	'	'	1,950	0	0
Total Operating Expense	'	'	'	'	'	'	'	'	223,286	150,218	158,221
INCOME BEFORE INCOME TAX EXPENSE	6,889	8,643	24,433	5,140	-7,418	4,431	5,988	-1,859	45,105	1,142	23,244
Income tax expense / (benefit)	'	'	'	'	'	'	'	'	13,794	-1,479	7,546
Pro Forma	'	'	'	'	'	'	'	'	'	'	'
Revenues:	'	'	'	'	'	'	'	'	'	'	'
Revenues, Excluding Interest and Dividends	'	'	'	'	'	'	'	'	355,489	256,114	'
Interest revenue	'	'	'	'	'	'	'	'	927	1,118	'
Interest Expense	'	'	'	'	'	'	'	'	1,865	993	'
Total net interest (expense) / revenue	'	'	'	'	'	'	'	'	-938	125	'
Revenue, Net	'	'	'	'	'	'	'	'	354,551	256,239	'
EXPENSES:	'	'	'	'	'	'	'	'	'	'	'
Other expense items	'	'	'	'	'	'	'	'	299,658	269,704	'
Depreciation and amortization	'	'	'	'	'	'	'	'	11,012	8,354	'
Purchased intangible amortization	'	'	'	'	'	'	'	'	5,157	7,488	'
Acquisition expense	'	'	'	'	'	'	'	'	1,824	85	'
Restructuring	'	'	'	'	'	'	'	'	1,570	634	'
Integration	'	'	'	'	'	'	'	'	1,950	0	'
Total Operating Expense	'	'	'	'	'	'	'	'	321,172	286,263	'
INCOME BEFORE INCOME TAX EXPENSE	'	'	'	'	'	'	'	'	33,379	-30,024	'
Income tax expense / (benefit)	'	'	'	'	'	'	'	'	12,517	-11,259	'
Net income / (loss)	'	'	'	'	'	'	'	'	$20,862	($18,765)	'

ACQUISITIONS_Restructuring_Det

ACQUISITIONS - Restructuring (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Reserve [Roll Forward]	'	'	'
2013 restructuring expenses	$1,570	$634	$0
Global Futures & Forex Ltd	'	'	'
Restructuring Reserve [Roll Forward]	'	'	'
Restructuring liability as of January 1, 2013	0	'	'
2013 restructuring expenses	1,570	600	'
Payments made in 2013	986	'	'
Liability as of December 31, 2013	$584	$0	'

SHAREHOLDERS_EQUITY_Additional

SHAREHOLDERS' EQUITY - Additional Information (Details) (USD $)	3 Months Ended				12 Months Ended			1 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2014
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Subsequent Event [Member]
Class of Stock [Line Items]	'	'	'	'	'	'	'	'
Common Stock, shares authorized	60,000,000	'	'	'	60,000,000	60,000,000	'	'
Common Stock, shares issued	41,921,609	'	'	'	41,921,609	36,486,036	'	'
Common stock, shares outstanding	39,425,434	'	'	'	39,425,434	34,924,095	'	'
Treasury stock, shares	2,496,175	'	'	'	2,496,175	1,561,941	'	'
Treasury stock, cost	$15,469,000	'	'	'	$15,469,000	$8,280,000	'	'
Dividends payable, amount per share	$0.05	$0.05	$0.05	$0.05	$0.20	$0.20	$0.05	$0.05
Aggregate amount dividends paid	'	'	'	'	$7,300,000	'	'	'

CONVERTIBLE_SENIOR_NOTES_Addit

CONVERTIBLE SENIOR NOTES - Additional Information (Details) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended		12 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Nov. 27, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Nov. 27, 2013	Nov. 27, 2013	Nov. 27, 2013	Nov. 27, 2013
				Convertible Debt [Member]	Convertible Debt [Member]	Convertible Debt [Member]	Convertible Debt [Member]	Convertible Debt [Member]	Convertible Debt [Member]	Convertible Debt [Member]	Convertible Debt [Member]
						Convertible Senior Note and Additional Paid In Capital	Interest Expense	Debt Instrument, Redemption, Period One	Debt Instrument, Redemption, Period Two and Three	Debt Instrument, Redemption, Period Two	Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Debt Instrument, Face Amount	'	'	'	$80,000,000	'	'	'	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	'	'	'	4.13%	'	'	'	'	'	'	'
Proceeds from issuance of convertible senior note, net	77,900,000	0	0	'	77,900,000	'	'	'	'	'	'
Debt Instrument, Convertible, Conversion Ratio	'	'	'	83.33	'	'	'	'	'	'	'
Debt Conversion, Converted Instrument, Amount	'	'	'	1,000	'	'	'	'	'	'	'
Debt Instrument, Convertible, Conversion Price	'	'	'	$12	'	'	'	'	'	'	'
Debt Instrument, Convertible, Number of Days Stock Price Exceeds Conversion Price Trigger	'	'	'	'	'	'	'	'20 days	'	'	'
Debt Instrument, Convertible, Threshold Consecutive Trading Days	'	'	'	'	'	'	'	'30 days	'	'5 days	'10 days
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger	'	'	'	'	'	'	'	130.00%	'	98.00%	'
Debt Instrument Convertible, Conversion Period	'	'	'	'	'	'	'	'	'5 days	'	'
Debt Instrument, Redemption Price, Percentage	'	'	'	100.00%	'	'	'	'	'	'	'
Debt Instrument, Convertible, Issuance Amount of Equity Component	'	'	'	12,600,000	12,572,000	'	'	'	'	'	'
Debt Issuance Cost, Purchasers Commission, Equity Component	'	'	'	300,000	'	'	'	'	'	'	'
Debt Issuance Cost, Additional Cost, Equity Component	'	'	'	100,000	'	'	'	'	'	'	'
Long-term Debt	'	'	'	67,400,000	65,360,000	'	'	'	'	'	'
Debt Instrument, Unamortized Discount	'	'	'	12,600,000	14,640,000	'	'	'	'	'	'
Debt Issuance Cost, Purchasers Commission	'	'	'	1,800,000	'	'	'	'	'	'	'
Debt Issuance Cost, Additional Cost	'	'	'	500,000	'	'	'	'	'	'	'
Debt Instrument, Unamortized Discount, Effective Interest Rate	'	'	'	8.00%	'	'	'	'	'	'	'
Debt Issuance Cost	'	'	'	2,700,000	'	'	'	'	'	'	'
Amortization of deferred financing costs	0	51,000	87,000	'	213,000	'	200,000	'	'	'	'
Unamortized Debt Issuance Expense	'	'	'	'	'	$1,900,000	'	'	'	'	'

CONVERTIBLE_SENIOR_NOTES_Sched

CONVERTIBLE SENIOR NOTES - Schedule of Liability and Equity Components (Details) (Convertible Debt [Member], USD $)	Dec. 31, 2013	Nov. 27, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013	Nov. 27, 2013
Convertible Debt [Member]	'	'
Debt Instrument [Line Items]	'	'
Liability component - principal	$80,000	'
Deferred bond discount	-14,640	-12,600
Liability component - net carrying value	65,360	67,400
Additional paid in capital	12,572	12,600
Discount attributable to equity	-425	'
Equity component	$12,147	'

CONVERTIBLE_SENIOR_NOTES_Sched1

CONVERTIBLE SENIOR NOTES - Schedule of Interest Expense (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]	'	'	'
Interest expense - amortization of deferred bond discount and costs	$0	$51	$87
Convertible Debt [Member]	'	'	'
Debt Instrument [Line Items]	'	'	'
Interest expense - stated coupon rate	275	'	'
Interest expense - amortization of deferred bond discount and costs	213	'	'
Total interest expense - convertible note	$488	'	'

SHARE_BASED_COMPENSATION_Addit

SHARE BASED COMPENSATION - Additional Information (Details) (USD $)

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

Jan. 02, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Nov. 22, 2010

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Nov. 22, 2010

Jan. 02, 2014

Nov. 22, 2010

Dec. 31, 2013

Dec. 31, 2012

Nov. 22, 2010

Restricted Stock Units (RSUs)

Restricted Stock Awards

2010 Omnibus Equity Incentive Plan

Equity Incentive Plan 2006

Employee Stock Purchase Plan 2011

Subsequent Event [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation, number of shares available for issuance

7,100,000

1,500,000

5,200,000

400,000

Share based compensation, additional number of shares to be issued percentage

3.00%

Share based compensation, additional number of shares to be issued

1,200,000

1,300,000

Share based compensation, grants expiry period

'7 years

Stock options, outstanding

2,623,125

3,588,900

Stock option, weighted average remaining contractual life

'4 years 7 months 6 days

'1 year 1 month 2 days

Stock options, exercisable

1,614,240

Total intrinsic value of stock options exercised

$4,740,662

$3,300,000

$2,000,000

Stock options vested

300,000

Proceeds from exercise of stock options

2,539,000

1,969,000

853,000

Stock options granted

496,000

300,000

400,000

Stock-based compensation expense related to options

700,000

800,000

Conversion ratio to shares of common stock

Restiricted stock lapsing percentage

25.00%

Restricted stock, shares granted

812,442

600,000

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number

1,029,395

586,096

111,439

181,888

Share based compensation, granted stock vesting period

'4 years

Stock-based compensation expense related to restricted stock

2,200,000

2,500,000

3,200,000

Total unrecognized compensation cost related to non-vested share-based compensation

4,500,000

Total unrecognized compensation cost related to non-vested share-based compensation, recognition period

'2 years

Fair market value on the grant date for RSUs and RSAs vested

1,700,000

3,100,000

3,900,000

Total intrinsic value of the RSUs and RSAs unrestricted

1,800,000

Restricted Stock Units and Restricted Stock awards vested and outstanding

21,500,000

Restricted Stock Units and Restricted Stock awards, granted

$3,100,000

$3,600,000

Employee Stock Purchase Plan, employee discount rate to purchase shares

15.00%

Shares reserved for issuance under employee Stock Purchase Plan

500,000

Shares issued under employee stock purchase plan (in shares)

80,000

50,000

Summary_of_Stock_Option_Activi

- Summary of Stock Option Activity Under All Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Number of Options	'	'	'
Beginning balance	3,588,900	'	'
Granted	496,000	300,000	400,000
Exercised	-1,394,977	'	'
Forfeited	-66,798	'	'
Ending balance	2,623,125	3,588,900	'
Vested and expected to vest options	2,554,173	'	'
Exercisable, December 31, 2013	1,614,240	'	'
Fair market value of common stock at exercise date	$7,279,641	'	'
Cost to exercise	2,539,000	1,969,000	853,000
Total intrinsic value of stock options exercised	4,740,662	3,300,000	2,000,000
Weighted average exercise price	'	'	'
Beginning balance	$2.32	'	'
Granted	$5.30	'	'
Exercised	$1.83	'	'
Forfeited	$4.85	'	'
Ending balance	$4.10	$2.32	'
Vested and expected to vest options	$4.07	'	'
Exercisable, December 31, 2013	$3.51	'	'
Weighted average remaining contractual term	'	'	'
Outstanding, January 1, 2013	'4 years 7 months 6 days	'1 year 1 month 2 days	'
Granted	'6 years 2 months 1 day	'	'
Exercised	'1 year 11 months 26 days	'	'
Forfeited	'7 years 10 months 2 days	'	'
Outstanding, December 31, 2013	'4 years 7 months 6 days	'1 year 1 month 2 days	'
Vested and expected to vest options	'4 years 2 months 4 days	'	'
Exercisable, December 31, 2013	'3 years 11 months 1 day	'	'
Aggregate intrinsic value	'	'	'
Outstanding, December 31, 2013	9,111,804	'	'
Vested and expected to vest options	8,929,214	'	'
Exercisable, December 31, 2013	$6,535,178	'	'

Summary_of_Outstanding_and_Exe

- Summary of Outstanding and Exercisable Stock Options (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	2,623,125	3,588,900
Weighted Average Exercise Price	$4.10	$2.32
Weighted Average Remaining Contractual Life (Years)	'4 years 7 months 6 days	'1 year 1 month 2 days
Number of Options Exercisable	1,614,240	'
Weighted Average Exercise Price	$3.51	'
$1.11	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	11,660	'
Weighted Average Exercise Price	$1.11	'
Weighted Average Remaining Contractual Life (Years)	'5 months 1 day	'
Number of Options Exercisable	11,660	'
Weighted Average Exercise Price	$1.11	'
$1.55	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	374	'
Weighted Average Exercise Price	$1.55	'
Weighted Average Remaining Contractual Life (Years)	'1 year 0 months 7 days	'
Number of Options Exercisable	374	'
Weighted Average Exercise Price	$1.55	'
$1.99	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	462,488	'
Weighted Average Exercise Price	$1.99	'
Weighted Average Remaining Contractual Life (Years)	'1 year 4 months 27 days	'
Number of Options Exercisable	462,488	'
Weighted Average Exercise Price	$1.99	'
$2.43	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	262,161	'
Weighted Average Exercise Price	$2.43	'
Weighted Average Remaining Contractual Life (Years)	'1 year 10 months 9 days	'
Number of Options Exercisable	262,161	'
Weighted Average Exercise Price	$2.43	'
$2.87	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	38,135	'
Weighted Average Exercise Price	$2.87	'
Weighted Average Remaining Contractual Life (Years)	'1 year 9 months 21 days	'
Number of Options Exercisable	38,135	'
Weighted Average Exercise Price	$2.87	'
$3.83	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	767,574	'
Weighted Average Exercise Price	$3.83	'
Weighted Average Remaining Contractual Life (Years)	'6 years 3 months 21 days	'
Number of Options Exercisable	603,526	'
Weighted Average Exercise Price	$3.83	'
$4.40	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	481,000	'
Weighted Average Exercise Price	$4.40	'
Weighted Average Remaining Contractual Life (Years)	'8 years 10 months 24 days	'
Number of Options Exercisable	0	'
Weighted Average Exercise Price	$0	'
$5.30	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	293,563	'
Weighted Average Exercise Price	$5.30	'
Weighted Average Remaining Contractual Life (Years)	'7 years 10 months 9 days	'
Number of Options Exercisable	78,312	'
Weighted Average Exercise Price	$5.30	'
$8.02	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'
Number Outstanding	306,170	'
Weighted Average Exercise Price	$8.02	'
Weighted Average Remaining Contractual Life (Years)	'6 years 11 months 8 days	'
Number of Options Exercisable	157,584	'
Weighted Average Exercise Price	$8.02	'

SHARE_BASED_COMPENSATION_Assum

SHARE BASED COMPENSATION - Assumptions for Stock Options Granted (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Assumptions	'	'	'
Risk-free rate	0.80%	0.90%	2.30%
Expected volatility	48.80%	48.50%	47.60%
Expected life	'4 years 9 months 18 days	'4 years 9 months 18 days	'4 years 9 months 18 days
Dividend yield	4.90%	4.90%	0.00%

Summary_of_Nonvested_Shares_of

- Summary of Nonvested Shares of Restricted Stock Units and Restricted Stock Awards (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Restricted Stock Units (RSUs)	'	'
Number of Shares	'	'
Non-vested, beginning balance	586,096	'
Granted	812,442	600,000
Vested	-276,466	'
Forfeited	-92,677	'
Non-vested, ending balance	1,029,395	586,096
Weighted Average Grant Date Fair Value	'	'
Non-vested, beginning balance	$5.80	'
Granted	$4.40	'
Vested	$6	'
Forfeited	$4.75	'
Non-vested, ending balance	$4.70	$5.80
Restricted Stock Awards	'	'
Number of Shares	'	'
Non-vested, beginning balance	181,888	'
Granted	0	'
Vested	-63,220	'
Forfeited	-7,229	'
Non-vested, ending balance	111,439	'
Weighted Average Grant Date Fair Value	'	'
Non-vested, beginning balance	$7.20	'
Granted	$0	'
Vested	$7.22	'
Forfeited	$6.71	'
Non-vested, ending balance	$7.28	'

EARNINGS_PER_COMMON_SHARE_Addi

EARNINGS PER COMMON SHARE - Additional Information (Details)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]	'	'
Anti-dilutive stock options excluded from calculation of diluted earnings per share	0.3	0.6

EARNINGS_PER_COMMON_SHARE_Comp

EARNINGS PER COMMON SHARE - Computation of Earnings Per Share (Details) (USD $)

3 Months Ended

12 Months Ended

In Thousands, except Share data, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Earnings Per Share [Abstract]

Net income

$4,268

$5,600

$17,164

$4,279

($3,787)

$3,221

$4,435

($1,247)

$31,311

$2,621

$15,698

Series E correction

-154

[1]

Net income after correction

$31,157

$2,621

$15,698

Weighted average common shares outstanding:

Basic weighted average common shares outstanding

36,551,246

34,940,800

34,286,840

Effect of dilutive securities:

Warrants (in shares)

160,529

Stock options (in shares)

1,214,370

1,490,089

2,732,302

RSUs/RSAs (in shares)

1,867,262

1,449,319

1,802,121

Diluted weighted average common shares outstanding

39,632,878

37,880,208

38,981,792

Earnings per common share

Basic (usd per share)

$0.11

$0.16

$0.48

$0.12

($0.11)

$0.09

$0.13

($0.04)

$0.85

$0.08

$0.46

Diluted (usd per share)

$0.10

$0.14

$0.44

$0.11

($0.11)

$0.08

$0.11

($0.04)

$0.79

$0.07

$0.40

[1]

During the period an adjustment to retained earnings was made, reflecting the amounts deemed uncollectible associated with previously issued preferred stock, which was converted to common stock immediately prior to the IPO.

LEGAL_Additional_Information_D

LEGAL - Additional Information (Details)	Feb. 28, 2011	Jun. 15, 2011	Aug. 30, 2013
	cases	Open E Cry Limited Liability Company	Patent Infringement [Member]
		patents	patents
Long-term Purchase Commitment [Line Items]	'	'	'
Number of alleged patent infringement lawsuit against the company	11	12	'
Loss Contingency, Number of Patents Vacated and Remanded	'	'	4

Future_Annual_Minimum_Lease_Pa

- Future Annual Minimum Lease Payments (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
2014	$4,193
2015	3,550
2016	2,838
2017	2,045
2018 and beyond	9,258
Operating Leases, Future Minimum Payments Due, Total	$21,884

Recovered_Sheet8

COMMITMENTS AND CONTINGENCIES - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]	'	'	'
Rent expense	$3.70	$2.60	$2.50

INCOME_TAXES_Components_of_Inc

INCOME TAXES - Components of Income from Continuing Operations Before Income Tax Expense (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
U.S.	'	'	'	'	'	'	'	'	$17,375	($10,795)	$9,766
Non-U.S.	'	'	'	'	'	'	'	'	27,730	11,937	13,478
INCOME BEFORE INCOME TAX EXPENSE	$6,889	$8,643	$24,433	$5,140	($7,418)	$4,431	$5,988	($1,859)	$45,105	$1,142	$23,244

INCOME_TAXES_Provision_for_Inc

INCOME TAXES - Provision for Income Tax Expense Benefit (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current	'	'	'
Federal	$6,651	($2,880)	$4,803
State	170	34	1,453
Current Income Tax Expense (Benefit)	13,755	-79	9,653
Deferred	'	'	'
Federal	-565	-865	-1,953
State	328	-1	-338
Change in valuation allowance	390	-630	0
Deferred Tax Expense (Benefit)	39	-1,400	-2,107
Total income tax (benefit) / expense	13,794	-1,479	7,546
UK [Member]	'	'	'
Current	'	'	'
Foreign	6,917	2,750	3,396
Japan [Member]	'	'	'
Current	'	'	'
Foreign	14	14	0
Deferred	'	'	'
Foreign	121	126	184
Other non-U.S. [Member]	'	'	'
Current	'	'	'
Foreign	3	3	1
Deferred	'	'	'
Foreign	($235)	($30)	$0

INCOME_TAXES_Additional_Inform

INCOME TAXES - Additional Information (Details) (USD $)	12 Months Ended
INCOME TAXES - Additional Information (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]	'	'	'	'
Foreign operating loss carryforwards	$7,900,000	'	'	'
Foreign net operating loss carryforwards	2,000,000	'	'	'
Net change in valuation allowance	400,000	'	'	'
Valuation allowance on Foreign Operating loss carry forwards	500,000	'	'	'
Undistributed earnings of foreign subsidiaries	53,700,000	'	'	'
Income tax expense on undistributed earnings of foreign subsidiaries upon repatriation	6,200,000	'	'	'
Liability for uncertain tax positions	57,000	78,000	189,000	126,000
Unrecognized tax benefits impact on effective tax rate	$100,000	$100,000	$200,000	'

INCOME_TAXES_Components_of_Com

INCOME TAXES - Components of Company Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 30, 2012
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 30, 2012
Deferred tax assets	'	'	'
Net foreign operating losses	$2,006	'	$1,893
Stock-based compensation expense	6,334	'	6,608
Intangible assets	2,777	'	3,414
Other	942	'	588
Total deferred tax assets	12,059	'	12,503
Valuation allowance	-493	'	-103
Total deferred tax assets after valuation allowance	11,566	'	12,400
Deferred tax liabilities	'	'	'
Unrealized trading differences	-5,653	'	-4,867
Unrealized foreign currency	0	'	-152
Basis difference in property and equipment	-333	'	-1,546
State taxes	-26	'	-78
Other	-632	'	-138
Total deferred tax liabilities	-6,644	'	-6,781
Net deferred tax assets	$4,922	$5,619	$5,619

INCOME_TAXES_Reconciles_Provis

INCOME TAXES - Reconciles Provision to United States Federal Statutory Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Federal income tax at statutory rate	35.00%	35.00%	35.00%
Increase/(decrease) in taxes resulting from:	'	'	'
State income tax	0.75%	2.47%	3.06%
Foreign rate differential	-6.45%	-121.09%	-4.24%
Meals & entertainment	0.16%	5.65%	0.40%
R&D credit	0.00%	7.47%	-0.70%
Establishment/(release) of valuation allowance	0.87%	-51.34%	0.00%
Uncertain tax positions	-0.05%	-9.04%	0.00%
Other permanent differences	0.30%	1.46%	-1.06%
Effective Tax Rate	30.58%	-129.42%	32.46%

Gross_Unrecognized_Tax_Benefit

- Gross Unrecognized Tax Benefits from Uncertain Tax Positions (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]	'	'	'
Beginning balance as of January 1	$78	$189	$126
Increases based on tax positions related to the current period	0	3	39
Increases based on tax positions related to prior periods	0	'	56
Decreases based on tax positions related to prior periods	-21	-20	0
Decreases related to a lapse of applicable statute of limitations	0	-94	-32
Ending balance as of December 31	$57	$78	$189

RETIREMENT_PLANS_Additional_In

RETIREMENT PLANS - Additional Information (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Employer's matching contribution percentage	'	'	'	25.00%
Employer's contribution percentage	'	'	'	15.00%
Employer's obligation to match employees with 3 years or more of service	'	'	'	50.00%
Employee compensation, benefits and expense	$0.90	$0.50	$0.70	'
Minimum	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Employees year of service	'	'	'	'3 years
401(K) retirement plan \| First Contributions	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Employer's matching contribution percentage	100.00%	'	'	'
Employer's contribution percentage	3.00%	'	'	'
401(K) retirement plan \| Next Contributions	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Employer's matching contribution percentage	50.00%	'	'	'
Employer's contribution percentage	2.00%	'	'	'

REGULATORY_REQUIREMENTS_Additi

REGULATORY REQUIREMENTS - Additional Information (Details)

Dec. 31, 2013

Jan. 17, 2013

Dec. 31, 2013

Jun. 29, 2013

USD ($)

Australian Securities & Investments Commission [Member]

Minimum

Maximum

GAIN Capital Forex.com Australia, Pty. Ltd.

GAIN Capital Group, LLC

GAIN Capital Securities, Inc.

GAIN Capital-Forex.com U.K., Ltd.

Forex.com Japan Co., Ltd.

GAIN Capital-Forex.com Hong Kong, Ltd.

Gain Global Markets, Inc.

GAIN Capital-Forex.com Canada Ltd.

USD ($)

AUD

Australian Securities & Investments Commission [Member]

USD ($)

AUD

USD ($)

Minimum

USD ($)

Maximum

USD ($)

Minimum

USD ($)

Maximum

USD ($)

CAD

USD ($)

AUD

USD ($)

AUD

USD ($)

EUR (€)

USD ($)

Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]

Net capital requirement

$50,000

50,000

$400,000

500,000

$20,000,000

$50,000

$1,000,000

€ 730,000

$1,925,000

$250,000

250,000

Minimum capital requirement as percentage of average revenue

5.00%

Percentage of total payables to customers required to be maintained

5.00%

Payables to customers

1,020,000

1,000,000

101,600,000

100,000,000

10,000,000

Capital in excess of regulatory capital, value

97,500,000

2,300,000

14,500,000

400,000

37,000,000

6,400,000

1,900,000

200,000

1,800,000

Capital in excess of regulatory capital, percentage

8.7

1.6

2.8

Aggregate indebtedness to net capital ratio

Regulatory capital held, percentage in excess of its requirements

110.00%

Minimum capital adequacy ratio

120.00%

Aggregate gross foreign currency position

1.50%

Net capital requirement

$100,000

REGULATORY_REQUIREMENTS_Minimu

REGULATORY REQUIREMENTS - Minimum Regulatory Capital Subsidiaries Required to Maintain (Details) (USD $)	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2013
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	$85.70
Capital Levels Maintained	183.2
Excess Net Capital	97.5
Requirement Maintained	214.00%
GFT Global Markets UK Ltd.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	32.3
Capital Levels Maintained	57.2
Excess Net Capital	24.9
Requirement Maintained	177.00%
GAIN Capital Group, LLC	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	24.6
Capital Levels Maintained	39.1
Excess Net Capital	14.5
Requirement Maintained	159.00%
GAIN Capital-Forex.com U.K., Ltd.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	20.5
Capital Levels Maintained	57.5
Excess Net Capital	37
Requirement Maintained	280.00%
Forex.com Japan Co., Ltd.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	3.1
Capital Levels Maintained	9.5
Excess Net Capital	6.4
Requirement Maintained	306.00%
GAIN Capital-Forex.com Hong Kong, Ltd.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	1.9
Capital Levels Maintained	3.8
Excess Net Capital	1.9
Requirement Maintained	200.00%
Global Futures & Forex Ltd. [Member]	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	1
Capital Levels Maintained	9
Excess Net Capital	8
Requirement Maintained	900.00%
GAIN Capital Forex.com Australia, Pty. Ltd.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	0.3
Capital Levels Maintained	2.6
Excess Net Capital	2.3
Requirement Maintained	867.00%
GAIN Capital-Forex.com Canada Ltd.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	0.2
Capital Levels Maintained	2
Excess Net Capital	1.8
Requirement Maintained	1000.00%
GAIN Capital Securities, Inc.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	0.1
Capital Levels Maintained	0.5
Excess Net Capital	0.4
Requirement Maintained	500.00%
Gain Global Markets, Inc.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	0.1
Capital Levels Maintained	0.3
Excess Net Capital	0.2
Requirement Maintained	300.00%
GFT Global Markets, Asia Pte. Ltd.	'
Schedule Of Compliance With Regulatory Capital Requirements For Broker Dealer [Line Items]	'
Capital Requirements	1.6
Capital Levels Maintained	1.7
Excess Net Capital	$0.10
Requirement Maintained	106.00%

SEGMENT_INFORMATION_Additional

SEGMENT INFORMATION - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013
	Segment
Segment Reporting [Abstract]	'
Number of operating segments	1

Quarterly_Financial_Data_Detai

Quarterly Financial Data (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Gross revenue	$83,801	$60,571	$72,833	$49,754	$32,286	$39,908	$45,721	$33,309	'	'	'
Net revenue	83,033	60,598	72,995	49,765	32,445	39,985	45,684	33,246	266,391	151,360	181,465
(Loss) / income before income tax expense	6,889	8,643	24,433	5,140	-7,418	4,431	5,988	-1,859	45,105	1,142	23,244
Net (loss) / income	$4,268	$5,600	$17,164	$4,279	($3,787)	$3,221	$4,435	($1,247)	$31,311	$2,621	$15,698
Basic net (loss) / income per share	$0.11	$0.16	$0.48	$0.12	($0.11)	$0.09	$0.13	($0.04)	$0.85	$0.08	$0.46
Diluted net (loss) / income per share	$0.10	$0.14	$0.44	$0.11	($0.11)	$0.08	$0.11	($0.04)	$0.79	$0.07	$0.40

SUBSEQUENT_EVENTS_Additional_I

SUBSEQUENT EVENTS - Additional Information (Detail) (Subsequent Event [Member], USD $)	1 Months Ended
	Feb. 28, 2014	Mar. 12, 2014
	Feb. 28, 2014	Global Asset Advisors, LLC and Top Third Ag Marketing LLC [Member]
Subsequent Event [Line Items]	'	'
Common stock dividend declared per share	$0.05	'
Percentage of shares to be acquired	'	55.00%