WEX (WEX) 10-Q 1 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 29, 2015
Document And Entity Information [Abstract]
Entity Registrant Name	WEX INC.
Trading Symbol	WEX
Entity Central Index Key	1309108
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		38,649,122

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Cash and cash equivalents	$511,017	$284,763
Accounts receivable (less reserve for credit losses of $11,513 in 2015 and $13,919 in 2014)	1,804,688	1,865,538
Income taxes receivable	9,506	6,859
Available-for-sale securities	19,011	18,940
Fuel price derivatives, at fair value	31,624	40,969
Property, equipment and capitalized software (net of accumulated depreciation of $168,224 in 2015 and $169,382 in 2014)	108,166	105,596
Deferred income taxes, net	10,270	5,764
Goodwill	1,085,513	1,116,914
Other intangible assets, net	472,062	498,045
Other assets	201,120	175,506
Total assets	4,252,977	4,118,894
Liabilities and Stockholders’ Equity
Accounts payable	525,263	425,956
Accrued expenses	119,853	137,227
Deposits	1,133,569	979,553
Revolving line-of-credit facilities and term loan	815,872	901,564
Deferred income taxes, net	61,235	43,752
Notes outstanding	400,000	400,000
Other debt	51,160	52,975
Amounts due under tax receivable agreement	69,637	69,637
Other liabilities	12,516	13,919
Total liabilities	3,189,105	3,024,583
Commitments and contingencies (Note 14)
Redeemable non-controlling interest	13,647	16,590
Stockholders’ Equity
Common stock $0.01 par value; 175,000 shares authorized; 43,063 shares issued in 2015 and 43,021 in 2014; 38,733 shares outstanding in 2015 and 38,897 in 2014	431	430
Additional paid-in capital	179,590	179,077
Non-controlling interest	13,644	17,396
Retained earnings	1,104,075	1,081,730
Accumulated other comprehensive income	-75,173	-50,581
Less treasury stock at cost; 4,428 shares in 2015 and 4,218 shares in 2014	-172,342	-150,331
Total stockholders’ equity	1,050,225	1,077,721
Total liabilities and stockholders’ equity	$4,252,977	$4,118,894

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Accounts receivable, reserve for credit losses	$11,513	$13,919
Property, equipment and capitalized software, accumulated depreciation	$168,224	$169,382
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	43,063,000	43,021,000
Common stock, shares outstanding	38,733,000	38,897,000
Treasury stock, shares	4,428,000	4,218,000

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues
Fleet payment solutions	$128,490	$135,435
Other payment solutions	73,795	46,633
Total revenues	202,285	182,068
Expenses
Salary and other personnel	58,417	43,902
Restructuring	8,559	0
Service fees	30,070	26,305
Provision for credit losses	3,914	9,090
Technology leasing and support	9,434	7,027
Occupancy and equipment	4,997	4,366
Depreciation, amortization and impairment	21,387	15,018
Operating interest expense	1,579	1,288
Cost of hardware and equipment sold	1,109	948
Other	15,794	12,587
Gain on divestiture	-1,215	0
Total operating expenses	154,045	120,531
Operating income	48,240	61,537
Financing interest expense	-12,088	-7,356
Net foreign currency (loss) gain	-4,376	1,033
Net realized and unrealized gain on fuel price derivative instruments	2,749	1,845
Income before income taxes	34,525	57,059
Income taxes	14,492	20,979
Net income	20,033	36,080
Less: Net loss attributable to non-controlling interests	-2,312	-462
Net earnings attributable to WEX Inc.	$22,345	$36,542
Net earnings attributable to WEX Inc. per share:
Basic (in dollars per share)	$0.58	$0.94
Diluted (in dollars per share)	$0.57	$0.93
Weighted average common shares outstanding:
Basic (in shares)	38,859	38,966
Diluted (in shares)	38,952	39,145

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$20,033	$36,080
Changes in available-for-sale securities, net of tax effect of $53 and $43 for the three months ended March 31, 2015 and 2014	91	74
Foreign currency translation	-29,066	14,779
Comprehensive (loss) income	-8,942	50,933
Less: comprehensive (loss) income attributable to non-controlling interests	-6,695	318
Comprehensive (loss) income attributable to WEX Inc.	($2,247)	$50,615

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Changes in available-for-sale securities, tax effect	$53	$43

CONDENSED_CONSOLIDATED_STATEME3

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Non-controlling interest in subsidiaries [Member]
In Thousands, unless otherwise specified
Beginning Balance at Dec. 31, 2013	$903,297	$429	$168,891	($15,495)	($130,566)	$879,519	$519
Beginning Balance (in shares) at Dec. 31, 2013		38,987
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued upon exercise of stock options (in shares)		8
Stock issued upon exercise of stock options	105	0	105
Tax benefit (expense) from stock option and restricted stock units	1,010		1,010
Stock issued upon vesting of restricted and deferred stock units (in shares)		63
Stock issued upon vesting of restricted and deferred stock units	0	1	-1
Stock-based compensation, net of share repurchases for tax withholdings	-883		-883
Purchase of shares of treasury stock (in shares)		-181
Purchase of shares of treasury stock	-16,948				-16,948
Changes in available-for-sale securities, net of tax effect of $43 in 2014 and $53 in 2015	74			74
Foreign currency translation	14,003			13,999			4
Net income	36,247					36,542	-295
Ending Balance at Mar. 31, 2014	936,905	430	169,122	-1,422	-147,514	916,061	228
Ending Balance (in shares) at Mar. 31, 2014		38,877
Beginning Balance at Dec. 31, 2014	1,077,721	430	179,077	-50,581	-150,331	1,081,730	17,396
Beginning Balance (in shares) at Dec. 31, 2014		38,897
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued upon exercise of stock options (in shares)		1
Stock issued upon exercise of stock options	14	0	14
Tax benefit (expense) from stock option and restricted stock units	-364		-364
Stock issued upon vesting of restricted and deferred stock units (in shares)		45
Stock issued upon vesting of restricted and deferred stock units	1	1	0
Stock-based compensation, net of share repurchases for tax withholdings	863		863
Purchase of shares of treasury stock (in shares)		-210
Purchase of shares of treasury stock	-22,011				-22,011
Changes in available-for-sale securities, net of tax effect of $43 in 2014 and $53 in 2015	91			91
Foreign currency translation	-26,134			-24,683			-1,451
Non-controlling interest investment	0						0
Net income	20,044					22,345	-2,301
Ending Balance at Mar. 31, 2015	$1,050,225	$431	$179,590	($75,173)	($172,342)	$1,104,075	$13,644
Ending Balance (in shares) at Mar. 31, 2015		38,733

CONDENSED_CONSOLIDATED_STATEME4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Stockholders' Equity [Abstract]
Changes in available-for-sale securities, tax effect	$53	$43

CONDENSED_CONSOLIDATED_STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income	$20,033	$36,080
Adjustments to reconcile net income to net cash provided by (used for) operating activities:
Fair value change of fuel price derivatives	9,345	-2,823
Stock-based compensation	3,218	2,423
Depreciation, amortization and impairment	22,155	15,612
Gain on divestiture	-1,215	0
Deferred taxes	13,854	10,066
Foreign currency remeasurement	15,768	0
Restructuring charge	8,567	0
Provision for credit losses	3,914	9,090
Loss on disposal of property, equipment and capitalized software	145	338
Changes in operating assets and liabilities:
Accounts receivable	17,826	-271,782
Other assets	-25,512	-8,455
Accounts payable	110,331	131,448
Accrued expenses	-23,921	-6,499
Income taxes	-1,558	5,708
Other liabilities	-1,303	1,038
Net cash provided by (used for) operating activities	171,647	-77,756
Cash flows from investing activities
Purchases of property, equipment and capitalized software	-12,074	-11,382
Purchases of available-for-sale securities	-86	-70
Maturities of available-for-sale securities	159	93
Proceeds from divestiture	16,708	0
Net cash provided by (used for) investing activities	4,707	-11,359
Cash flows from financing activities
Excess tax benefits from equity instrument share-based payment arrangements	-364	1,010
Repurchase of share-based awards to satisfy tax withholdings	-2,355	-3,306
Proceeds from stock option exercises	14	104
Net change in deposits	155,715	101,288
Other debt	-485	3,429
Net activity on 2014 revolving credit facility	-72,431	0
Net activity on term loan	-6,875	-3,750
Purchase of shares of treasury stock	-22,011	-16,948
Net cash provided by financing activities	51,208	81,827
Effect of exchange rate changes on cash and cash equivalents	-1,308	574
Net change in cash and cash equivalents	226,254	-6,714
Cash and cash equivalents, beginning of period	284,763	361,486
Cash and cash equivalents, end of period	511,017	354,772
Supplemental cash flow information
Interest paid	17,698	13,262
Income taxes paid	$2,745	$4,041

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation
	1	Basis of Presentation
	The acronyms and abbreviations identified below are used in the accompanying unaudited condensed consolidated financial statements and the notes thereto. The following is provided to aid the reader and provide a reference point when reviewing the unaudited condensed consolidated financial statements.
	2011 Credit Agreement		Credit agreement entered into on May 23, 2011 among the Company, as borrower, WEX Card Holdings Australia Pty Ltd, a wholly-owned subsidiary of the Company, as specified designated borrower, Bank of America, N.A., as administrative agent and letter of credit issuer, and the other lenders party thereto
	2013 Credit Agreement		Amended and restated credit agreement entered into on January 18, 2013 by and among the Company and certain of our subsidiaries, as borrowers, and WEX Card Holdings Australia Pty Ltd, as specified designated borrower, with a lending syndicate
	2014 Amendment Agreement		Amendment and restatement agreement entered into on August 22, 2014, among the Company, the lenders party thereto, and Bank of America, N.A., as administrative agent
	2014 Credit Agreement		Second amended and restated credit agreement entered into on August 22, 2014, by and among the Company and certain of our subsidiaries, as borrowers, and WEX Card Holding Australia
	Adjusted Net Income or ANI		A non-GAAP metric that adjusts net earnings attributable to WEX Inc. for fair value changes of fuel-price related derivative instruments, the amortization of purchased intangibles, the expense associated with stock-based compensation, acquisition related expenses, the net impact of tax rate changes on the Company’s deferred tax asset and related changes in the tax-receivable agreement, deferred loan costs associated with the extinguishment of debt, certain non-cash asset impairment charges, restructuring charges, gains on the extinguishment of a portion of the tax receivable agreement, gain or losses on divestitures and adjustments attributable to non-controlling interests, as well as the related tax impacts of the adjustments
	ASU 2014-09		Accounting Standards Update No. 2014-09 Revenue from Contracts with Customers (Topic 606)
	ASU 2015-03		Accounting Standards Update No. 2015-03 Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs
	ASU 2015-04		Accounting Standards Update No. 2015-04 Compensation—Retirement Benefits (Topic 715): Practical Expedient for the Measurement Date of an Employer’s Defined Benefit Obligation and Plan Assets
	ASU 2015-05		Accounting Standards Update No. 2015-05 Intangibles—Goodwill and Other— Internal-Use Software (Subtopic 350-40) Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement
	Company		WEX Inc. and all entities included in the unaudited condensed consolidated financial statements
	European fleet business		Primarily includes our European commercial fleet card portfolio acquired by the Company from ExxonMobil on December 1, 2014 ("Esso portfolio in Europe")
	Evolution1		EB Holdings Corp. and its subsidiaries which includes Evolution1, Inc., acquired by the Company on July 16, 2014
	FASB		Financial Accounting Standards Board
	GAAP		Generally Accepted Accounting Principles in the United States
	Indenture		Indenture dated as of January 30, 2013 among the Company, the guarantors listed therein, and The Bank of New York Mellon Trust Company, N.A., as trustee
	NCI		Non-controlling interests
	Notes		$400 million notes with a 4.75% fixed rate, issued on January 30, 2013
	NOW deposits		Negotiable order of withdrawal deposits
	Pacific Pride		Pacific Pride Services, LLC, previously a wholly owned subsidiary, sold on July 29, 2014
	rapid! PayCard		rapid! PayCard, previously a line of business of the Company, sold on January 7, 2015
	SEC		Securities and Exchange Commission
	UNIK		UNIK S.A., the Company's Brazilian 51 percent majority owned subsidiary
	WEX		WEX Inc.
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. They do not include all information and notes required by GAAP for complete financial statements. However, except as disclosed herein, there have been no material changes in the information disclosed in the notes to the consolidated financial statements included in the Annual Report on Form 10-K of WEX Inc. for the year ended December 31, 2014. These unaudited condensed consolidated financial statements should be read in conjunction with the financial statements that are included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014, filed with the SEC on February 26, 2015. In the opinion of management, all adjustments (including normal recurring accruals) considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2015 are not necessarily indicative of the results that may be expected for any future quarter(s) or the year ending December 31, 2015.
	Fair Value of Financial Instruments
	The carrying values of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses, and other liabilities approximate their respective fair values due to the short-term nature of such instruments. The carrying values of certificates of deposit, interest-bearing money market deposits, borrowed federal funds and credit agreement borrowings approximate their respective fair values as the interest rates on these financial instruments are variable. All other financial instruments are reflected at fair value on the condensed consolidated balance sheets.

New_Accounting_Standards

New Accounting Standards	3 Months Ended
	Mar. 31, 2015
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards
	2	New Accounting Standards
	In May 2014, the FASB issued ASU 2014-09 related to revenue recognition, which will supersede most existing revenue recognition guidance under U.S. GAAP. The new revenue recognition standard requires entities to recognize revenue for the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In April 2015, the Board tentatively decided to defer the original effective date of interim and annual reporting periods beginning after December 15, 2016 by one year. As a result, public entities would apply the new revenue standard to annual reporting periods beginning after December 15, 2017. Early adoption is permitted, but not before the original public entity effective date (that is, annual periods beginning after December 15, 2016). The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method.
	In April 2015, the FASB issued ASU 2015-03 related to the simplification of the presentation of debt issuance costs. The standard requires entities to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the costs is reported as interest expense. The new standard is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. Entities would apply the new guidance retrospectively to all prior periods and provide the applicable disclosures for a change in accounting principal: (i) the nature of and reason for the change in accounting principle; (ii) the transition method; (iii) a description of the prior-period information that has been retrospectively adjusted; and, (iv) the effect of the change on the financial statement line item. The adoption of this standard affects presentation only and, as such, is not expected to have a material impact on the Company's consolidated financial statements.
	In April 2015, the FASB issued ASU 2015-04 related to using a practical expedient for the measurement date of an employer’s defined benefit obligation and plan assets.The new standard gives an entity with a fiscal year-end that does not coincide with a calendar month-end the ability, as a practical expedient, to measure its defined benefit retirement obligations and related plan assets as of the month-end that is closest to its fiscal year-end. Additionally, the new standard provides guidance on accounting for (i) contributions to the plan and (ii) significant events that require a remeasurement (e.g., a plan amendment, settlement, or curtailment) that occur during the period between a month-end measurement date and the employer’s fiscal year-end. An entity should reflect the effects of those contributions or significant events in the measurement of the retirement benefit obligations and related plan assets. As a separate practical expedient, an entity may elect to measure the effects of a significant event as of the calendar month-end closest to the date of the significant event. The new standard is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted and the new standard should be applied prospectively. The Company does not believe that the adoption of ASU 2014-05 will have a material impact on its results of operations.
	In April 2015, the FASB issued ASU 2015-05 related to customer's accounting for fees paid in a cloud computing arrangement. The new standard requires a customer to determine whether a cloud computing arrangement contains a software license. If the arrangement contains a software license, the customer would account for the fees related to the software license element in a manner consistent with how the acquisition of other software licenses is accounted for under accounting guidance for internal-use software. Early adoption is permitted for all entities. An entity can elect to adopt the amendments either (i) prospectively to all arrangements entered into or materially modified after the effective date or (ii) retrospectively. The Company does not believe that the adoption of ASU 2014-05 will have a material impact on its results of operations.

Business_Acquisitions

Business Acquisitions	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Business Acquisitions
	3	Business Acquisitions
	Esso portfolio in Europe
	On December 1, 2014, the Company acquired certain assets of the Esso portfolio in Europe through a majority owned subsidiary, WEX Europe Services Limited. The Company formed this entity during 2013 and has 75 percent ownership. The Company paid $377,618 in cash, which includes an $80,000 advance payment made in the third quarter of 2014. The purchase price is subject to an estimated future working capital adjustment that is expected to be settled in 2015. The transaction was financed through the Company’s cash on hand and existing credit facility. Under the terms of the transaction, WEX purchased ExxonMobil’s commercial fleet fuel card program which includes operations, funding, pricing, sales and marketing in nine countries in Europe. As part of the transaction, both parties have agreed to enter into a long term supply agreement to serve the current and future Esso Card customers and to grow the business. The Company entered into this transaction in order to expand its presence in the European market and to broaden its international footprint, while laying the foundation for further expansion.
	During the fourth quarter of 2014, the Company obtained preliminary information to assist in determining the fair values of certain tangible and intangible assets acquired and liabilities assumed in the Esso portfolio in Europe transaction. During the first quarter of 2015, the Company obtained additional information to assist in determining the fair values of certain tangible and intangible assets acquired and liabilities assumed as of the acquisition date. Based on such information, the Company retrospectively adjusted the fiscal year 2014 comparative information resulting in an increase in goodwill of $549, a decrease in accounts receivable of $2 and a decrease in other tangible assets and liabilities, net, including consideration receivable of $547. Based on such information, the Company recorded intangible assets and goodwill as described below. The Company is still reviewing the valuation as well as performing procedures to verify the completenesses and accuracy of the data used in the independent valuation of all assets and liabilities. The Company has not finalized the purchase accounting. Goodwill related to this transaction is expected to be deductible for income tax purposes. The results of operations for the Esso portfolio in Europe are presented in the Company's Fleet Payment Solutions segment.
	The following is a summary of the preliminary allocation of the purchase price to the assets and liabilities acquired:
	Consideration paid (net of cash acquired and consideration receivable)	$	377,618
	Less:
	Accounts receivable	303,376
	Other tangible assets and liabilities, net	(11,097		)
	Licensing agreements(a)	36,979
	Customer relationships(b)	7,720
	Recorded goodwill	$	40,640
	(a)	Weighted average life – 4.6 years.
	(b)	Weighted average life – 7.2 years.
	Supplemental pro forma financial information related to the Esso portfolio in Europe acquisition has not been provided as it would be impracticable to do so. Historical financial information regarding the acquired assets is not accessible and, thus, the amounts would require estimates to be significant and render the disclosure irrelevant.
	Acquisition of Evolution1
	On July 16, 2014, the Company acquired all of the outstanding stock of Evolution1, a leading provider of cloud-based technology and payment solutions within the healthcare industry, for approximately $532,174 in cash. The transaction was financed through the Company’s cash on hand and existing credit facility. Evolution1 developed and operates an all-in-one, multi-tenant technology platform, card products, and mobile offering that supports a full range of healthcare account types. This includes consumer-directed payments for health savings accounts, health reimbursement arrangements, flexible spending accounts, voluntary employee beneficiary associations, and defined contribution and wellness programs. The Company acquired Evolution1 to enhance the Company's capabilities and positioning in the growing healthcare market.
	During the third quarter of 2014, the Company obtained preliminary information to assist in determining the fair values of certain tangible and intangible assets acquired and liabilities assumed in the Evolution1 acquisition. During the fourth quarter of 2014, the Company obtained additional information to assist in determining the fair values of certain tangible and intangible assets acquired and liabilities assumed as of the acquisition date. Based on such information, the Company recorded intangible assets and goodwill as described below. The Company is still reviewing the valuation of the tax assets and liabilities and has not finalized the purchase accounting. Evolution1 had previously recorded goodwill on its financial statements from a prior acquisition, some of which is expected to be deductible for tax purposes. The results of operations for Evolution1 are presented in the Company's Other Payment Solutions segment.
	The following is a summary of the preliminary allocation of the purchase price to the assets and liabilities acquired:
	Consideration paid (net of cash acquired)	$	532,174
	Less:
	Accounts receivable	8,418
	Accounts payable	(175		)
	Deferred tax liabilities, net	(68,516		)
	Other tangible assets and liabilities, net	(3,585		)
	Acquired software and developed technology(a)	70,000
	Customer relationships(b)	211,000
	Trade name(c)	7,900
	Trade name(d)	11,000
	Recorded goodwill	$	296,132
	(a)	Weighted average life – 6.4 years.
	(b)	Weighted average life – 9.7 years.
	(c)	Weighted average life – 9.9 years.
	(d)	Indefinite-lived
	The following represents unaudited pro forma operational results as if Evolution1 had been included in the Company’s unaudited condensed consolidated statements of operations as of the beginning of the fiscal period ended:
		Three months ended
		March 31,
		2014
	Revenue	$	205,270
	Net income attributable to WEX Inc.	$	38,581
	Pro forma net income attributable to WEX Inc. per common share:
	Net income per share – basic	$	0.99
	Net income per share – diluted	$	0.99
	The pro forma financial information assumes that the companies were combined as of January 1, 2013, and includes the business combination accounting impact from the acquisition, including acquisition related expenses, amortization charges from acquired intangible assets, interest expense for debt incurred in the acquisition and net income tax effects. The pro forma results of operations do not include any cost savings or other synergies that may result from the acquisition or any estimated integration costs that have been or will be incurred by the Company. The pro forma information as presented above is for informational purposes only and is not indicative of the results of operations that would have been achieved if the acquisition had taken place at the beginning of fiscal year 2014.

Sale_of_Subsidiary_and_Assets

Sale of Subsidiary and Assets	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Sale of Subsidiary and Assets
	4	Sale of Subsidiary and Assets
	rapid! PayCard
	On January 7, 2015, the Company sold the assets of its operations of rapid! PayCard for $20,000, subject to final working capital adjustments which resulted in a pre-tax gain of approximately $1,215. The Company's primary focus in the U.S. continues to be in the fleet, travel, and healthcare industries. As such, the Company divested the operations of rapid! PayCard. The operations of rapid! PayCard were not material to the Company's annual revenue, net income or earnings per share. The Company does not view this divestiture as a strategic shift in its Other Payment Solution segment.
	Pacific Pride
	On July 29, 2014, the Company sold its wholly owned subsidiary Pacific Pride for $49,664, which resulted in a pre-tax gain of $27,490. The transfer of the operations of Pacific Pride occurred on July 31, 2014. The Company decided to sell the operations of Pacific Pride as it did not align with the long-term strategy of the core fleet business. The operations of Pacific Pride were not material to the Company's annual revenue, net income or earnings per share. Simultaneously with the sale, the Company entered into a multi-year agreement with the buyer that will continue to allow WEX branded card acceptance at Pacific Pride locations. The Company does not view this divestiture as a strategic shift in its Fleet Payment Solution segment.
	The following is a summary of the allocation of the assets and liabilities sold:
	Consideration received	$	49,664
	Less:
	Expenses associated with the sale	1,340
	Accounts receivable	48,699
	Accounts payable	(53,001		)
	Other tangible assets and liabilities, net	828
	Customer relationships	3,727
	Trademarks and trade name	1,444
	Goodwill	19,137
	Gain on sale	$	27,490

Reserves_for_Credit_Losses

Reserves for Credit Losses	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Reserves for Credit Losses
	5	Reserves for Credit Losses
	In general, the Company’s trade receivables provide for payment terms of 30 days or less. Beginning in the first quarter of 2015, the Company began to extend revolving credit to certain customers with respect to small fleet receivables. The portfolio of receivables consists of a large group of smaller balance homogeneous amounts that are collectively evaluated for impairment. No customer made up more than seven percent of the outstanding receivables at March 31, 2015.
	As of March 31, 2015, approximately 95 percent of the outstanding balance of total trade accounts receivable was current and approximately 98 percent of the outstanding balance of total trade accounts receivable was less than 60 days past due. As of March 31, 2014, approximately 96 percent of the outstanding balance of total trade accounts receivable was current and approximately 99 percent of the outstanding balance was less than 60 days past due. The outstanding balance is made up of receivables from a wide range of industries.
	The following table presents changes in reserves for credit losses related to accounts receivable:
		Three months ended March 31,
		2015			2014
	Balance, beginning of period	$	13,919		$	10,396
	Provision for credit losses	3,914			9,090
	Charge-offs	(7,367		)	(8,107		)
	Recoveries of amounts previously charged-off	1,210			1,697
	Currency translation	(163		)	87
	Balance, end of period	$	11,513		$	13,163

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets
	6	Goodwill and Other Intangible Assets
	Goodwill
	The changes in goodwill during the first three months of 2015 were as follows:
		Fleet Payment Solutions Segment			Other			Total
					Payment
					Solutions
					Segment
	Gross goodwill, January 1, 2015	$	759,998		$	374,424		$	1,134,422
	Impact of foreign currency translation	(15,095		)	(3,920		)	(19,015		)
	Sale of rapid! PayCard	—			(12,386		)	(12,386		)
	Gross goodwill, March 31, 2015	744,903			358,118			1,103,021
	Accumulated impairment, March 31, 2015	(1,337		)	(16,171		)	(17,508		)
	Net goodwill, March 31, 2015	$	743,566		$	341,947		$	1,085,513
	As described in Note 3, the Company adjusted the amount of goodwill as of December 31, 2014 in the accompanying unaudited condensed consolidated balance sheet to account for the measurement period adjustments to the Esso portfolio in Europe purchase price allocation.
	The Company had no impairments to goodwill during the three months ended March 31, 2015.
	Management is currently evaluating its internal reporting structure and is in the process of determining the impact of the changes on the Company’s segment and goodwill reporting.
	Other Intangible Assets
	The changes in other intangible assets during the first three months of 2015 were as follows:
		Net			Amortization			Disposals			Impact of			Net Carrying
		Carrying									foreign			Amount, March 31, 2015
		Amount,									currency
		January 1,									translation
		2015
	Definite-lived intangible assets
	Acquired software and developed technology	$	119,509		$	(3,062	)	$	—		$	(1,984	)	$	114,463
	Customer relationships	309,824			(7,695		)	(2,296		)	(4,450		)	295,383
	Licensing agreements	35,715			(1,089		)	—			(3,792		)	30,834
	Patent	1,245			(27		)	—			(107		)	1,111
	Trade names	15,373			(286		)	(723		)	(198		)	14,166
	Indefinite-lived intangible assets
	Trademarks and trade names	16,379			—			—			(274		)	16,105
	Total	$	498,045		$	(12,159	)	$	(3,019	)	$	(10,805	)	$	472,062
	The following table presents the estimated amortization expense related to the definite-lived intangible assets listed above for the remainder of 2015 and for each of the five succeeding fiscal years:
	Remaining 2015	$	35,889
	2016	$	47,444
	2017	$	47,129
	2018	$	43,702
	2019	$	40,417
	2020	$	37,025
	Other intangible assets, net consist of the following:
		31-Mar-15									31-Dec-14
		Gross			Accumulated			Net Carrying			Gross			Accumulated			Net Carrying
		Carrying			Amortization			Amount			Carrying			Amortization			Amount
		Amount									Amount
	Definite-lived intangible assets
	Acquired software and developed technology	$	147,365		$	(32,902	)	$	114,463		$	150,458		$	(30,949	)	$	119,509
	Customer relationships	381,810			(86,427		)	295,383			394,316			(84,492		)	309,824
	Licensing agreements	32,225			(1,391		)	30,834			36,100			(385		)	35,715
	Patent	2,543			(1,432		)	1,111			2,697			(1,452		)	1,245
	Trademarks and trade names	16,555			(2,389		)	14,166			17,786			(2,413		)	15,373
		$	580,498		$	(124,541	)	455,957			$	601,357		$	(119,691	)	481,666
	Indefinite-lived intangible assets
	Trademarks and trade names							16,105									16,379
	Total							$	472,062								$	498,045

Earnings_per_Share

Earnings per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings per Share
	7	Earnings per Share
	The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the three months ended March 31, 2015 and 2014:
		Three months ended
		March 31,
		2015		2014
	Net earnings attributable to WEX Inc. available for common stockholders – Basic and Diluted	$	22,345	$	36,542
	Weighted average common shares outstanding – Basic	38,859		38,966
	Unvested restricted stock units	76		153
	Stock options	17		26
	Weighted average common shares outstanding – Diluted	38,952		39,145
	No material amount of shares were considered anti-dilutive during the periods reported.

Derivative_Instruments

Derivative Instruments

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

8

Derivative Instruments

The Company is exposed to certain market risks relating to its ongoing business operations. Derivative instruments are utilized to manage the Company's commodity price risk. The Company enters into put and call option contracts related to the Company’s commodity price risk, which are based on the wholesale price of gasoline and the retail price of diesel fuel and settle on a monthly basis. These put and call option contracts, or fuel price derivative instruments, are designed to reduce the volatility of the Company’s cash flows associated with its fuel price-related earnings exposure in North America.

During the fourth quarter of 2014 the Company suspended purchases under its fuel derivatives program due to unusually low prices in the commodities market. Management will continue to monitor the fuel price market and evaluate its alternatives as it relates to this hedging program.

Beginning in April 2014, the Company initiated a partial foreign currency exchange hedging program. The Company uses currency forward contracts to offset the foreign currency impact of balance sheet translation. Prior to the first quarter of 2015, the Company managed foreign currency exchange exposure on an intra-quarter basis. Beginning in the first quarter of 2015, the Company held foreign currency exchange contracts that were outstanding over the quarter-end period, minimized foreign cash balances, and expanded the scope of its hedging program to include more currencies. The realized and unrealized gains or losses on the currency forward contracts are reported in earnings within the same unaudited condensed consolidated statement of income line as the impact of the foreign currency translation, net foreign currency (loss) gain.

Accounting guidance requires companies to recognize all derivative instruments as either assets or liabilities at fair value in the unaudited condensed consolidated balance sheet. The Company’s fuel price derivative instruments and foreign currency instruments do not qualify for hedge accounting treatment under the current accounting guidance, and therefore, no such hedging designation has been made.

Derivatives Not Designated as Hedging Instruments

For derivative instruments that are not designated as hedging instruments, the gain or loss on the derivative is recognized in current earnings.

As of March 31, 2015, the Company had the following put and call option contracts related to the Company's commodity fuel price derivatives, which are not designated as hedging contracts and settle on a monthly basis:

Aggregate

Notional

Amount

(gallons) (a)

Fuel price derivative instruments – unleaded fuel

Option contracts settling April 2015 – March 2016

23,947

Fuel price derivative instruments – diesel

Option contracts settling April 2015 – March 2016

11,790

Total fuel price derivative instruments

35,737

(a)

The settlement of the put and call option contracts is based upon the New York Mercantile Exchange’s New York Harbor Reformulated Gasoline Blendstock for Oxygenate Blending and the U.S. Department of Energy’s weekly retail on-highway diesel fuel price for the month.

As of March 31, 2015, the Company had the following forward and spot contracts related to its foreign currency exchange contracts, which are not designated as hedging contracts and settle at various dates within approximately 40 days:

Aggregate

Notional

Amount

($)

Foreign currency exchange contracts

366,991

The following table presents information on the location and amounts of derivative fair values in the unaudited condensed consolidated balance sheets:

Derivatives Classified as Assets

Derivatives Classified as Liabilities

31-Mar-15

31-Dec-14

31-Mar-15

31-Dec-14

Derivatives Not Designated as Hedging Instruments

Balance

Fair

Balance

Fair

Balance

Fair

Balance

Fair

Sheet

Value

Sheet

Value

Sheet

Value

Sheet

Value

Location

Location

Location

Location

Commodity contracts

Fuel price

$

31,624

Fuel price

$

40,969

Fuel price

$

—

Fuel price

$

—

derivatives,

derivatives,

derivatives,

derivatives,

at fair value

at fair value

at fair value

at fair value

Foreign currency exchange contracts

Other assets

$

2,752

Other assets

$

—

Other liabilities

$

—

Other liabilities

$

—

The following table presents information on the location and amounts of derivative gains and losses in the unaudited condensed consolidated statements of income:

Amount of Gain or

(Loss) Recognized in

Income on  Derivative

Derivatives Not Designated as Hedging Instruments

Location of Gain or (Loss)

Three months ended March 31,

Recognized in

Income on Derivative

2015

2014

Commodity contracts

Net realized and unrealized gain (loss) on fuel price derivatives

$

2,749

$

1,845

Foreign currency exchange contracts

Net unrealized gain (loss) on currency forward contracts

$

2,752

$

—

Financing_and_Other_Debt

Financing and Other Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Financing and Other Debt
	9	Financing and Other Debt
	2014 Credit Agreement
	As of March 31, 2015, we have $336,497 of borrowings against our $700,000 revolving credit facility. The outstanding debt under our amortizing term loan arrangement, which expires in January of 2018, totaled $479,375 at March 31, 2015 and $486,250 at December 31, 2014. As of March 31, 2015, amounts outstanding under the amortizing term loan bear interest at a rate of LIBOR plus 225 basis points. The revolving credit facility currently bears interest at a rate equal to, at our option, (a) LIBOR plus 225 basis points, (b) the prime rate plus 175 basis points for our domestic borrowings; and the Eurocurrency rate plus 225 basis points for our international borrowings.
	UNIK debt
	UNIK had approximately $6,160 of debt as of March 31, 2015, and $7,975 of debt as of December 31, 2014. UNIK's debt is comprised of various credit facilities held in Brazil, with various maturity dates. The weighted average annual interest rate was 13.4 percent as of March 31, 2015, and 13.9 percent as of December 31, 2014. This debt is classified in Other debt on the Company’s unaudited condensed consolidated balance sheets for the periods presented.
	Participation debt
	During the second quarter of 2014, WEX Bank entered into an agreement with a third party bank to fund a customer balance that exceeded WEX Bank's lending limit to an individual customer. This borrowing carries a variable interest rate of 3-month LIBOR plus a margin of 2.25 percent.  The balance of the debt as of both March 31, 2015 and December 31, 2014, was $45,000,which, in each case, was secured by an interest in the underlying customer receivable. The participation debt balance will fluctuate on a daily basis based on customer funding needs, and will range from $0 to $45,000. The participation debt agreement will mature on April 1, 2016. This debt is classified in Other debt on the Company’s unaudited condensed consolidated balance sheets for the periods presented.

Fair_Value

Fair Value	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value
	10	Fair Value
	The Company holds mortgage-backed securities, fixed income and equity securities, derivatives (see Note 8, Derivative Instruments) and certain other financial instruments which are carried at fair value. The Company determines fair value based upon quoted prices when available or through the use of alternative approaches, such as model pricing, when market quotes are not readily accessible or available. In determining the fair value of the Company’s obligations, various factors are considered, including: closing exchange or over-the-counter market price quotations; time value and volatility factors underlying options and derivatives; price activity for equivalent instruments; and the Company’s own credit standing.
	These valuation techniques may be based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect the Company’s market assumptions. These two types of inputs create the following fair value hierarchy:
	•	Level 1 – Quoted prices for identical instruments in active markets.
	•	Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.
	•	Level 3 – Instruments whose significant value drivers are unobservable.
	The following table presents the Company’s assets that are measured at fair value and the related hierarchy levels as of March 31, 2015:
						Fair Value Measurements
						at Reporting Date Using
		31-Mar-15				Quoted Prices				Significant		Significant
						in Active				Other		Unobservable
						Markets for				Observable		Inputs
						Identical				Inputs		(Level 3)
						Assets				(Level 2)
						(Level 1)
	Assets:
	Mortgage-backed securities	$	788			$	—			$	788	$	—
	Asset-backed securities	1,079				—				1,079		—
	Municipal bonds	494				—				494		—
	Equity securities	16,650				16,650				—		—
	Total available-for-sale securities	$	19,011			$	16,650			$	2,361	$	—
	Executive deferred compensation plan trust (a)	$	6,406			$	6,406			$	—	$	—
	Foreign currency exchange contracts(a)	$	2,752			$	—			$	2,752	$	—
	Fuel price derivatives – unleaded fuel (b)	$	21,363			$	—			$	21,363	$	—
	Fuel price derivatives – diesel (b)	10,261				—				—		10,261
	Total fuel price derivatives	$	31,624			$	—			$	21,363	$	10,261
	(a)	The fair value of these instruments is recorded in Other assets.
	(b)	The balance sheet presentation combines unleaded fuel and diesel fuel positions.
	The following table presents the Company’s assets and liabilities that are measured at fair value and the related hierarchy levels as of December 31, 2014:
						Fair Value Measurements
						at Reporting Date Using
		31-Dec-14				Quoted Prices				Significant		Significant
						in Active				Other		Unobservable
						Markets for				Observable		Inputs
						Identical Assets				Inputs		(Level 3)
						(Level 1)				(Level 2)
	Assets:
	Mortgage-backed securities	$	810			$	—			$	810	$	—
	Asset-backed securities	1,165				—				1,165		—
	Municipal bonds	554				—				554		—
	Equity securities	16,411				16,411				—		—
	Total available-for-sale securities	$	18,940			$	16,411			$	2,529	$	—
	Executive deferred compensation plan trust (a)	$	5,927			$	5,927			$	—	$	—
	Fuel price derivatives – unleaded fuel (b)	$	29,120			$	—			$	29,120	$	—
	Fuel price derivatives – diesel (b)	11,849				—				—		11,849
	Total fuel price derivatives	$	40,969			$	—			$	29,120	$	11,849
	(a)	The fair value of these instruments is recorded in Other assets.
	(b)	The balance sheet presentation combines unleaded fuel and diesel fuel positions.
	The following table presents a reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three months ended:
			March 31, 2015				March 31, 2014
			Fuel Price				Fuel Price
			Derivatives –				Derivatives –
			Diesel				Diesel
	Beginning balance		$	11,848			$	(2,142	)
	Total gains and (losses) – realized/unrealized
	Included in earnings (a)		(1,587		)		1,519
	Included in other comprehensive income		—				—
	Purchases, issuances and settlements		—				—
	Transfers (in)/out of Level 3		—				—
	Ending balance		$	10,261			$	(623	)
	(a)Gains and losses (realized and unrealized) associated with fuel price derivatives, included in earnings for the three months ended March 31, 2015 and 2014, are reported in net realized and unrealized losses on fuel price derivatives on the unaudited condensed consolidated statements of income.
	$400 Million Notes outstanding
	The Notes outstanding as of March 31, 2015, have a carrying value of $400,000 and fair value of $397,000. As of December 31, 2014, the carrying value of the $400,000 in Notes outstanding had a fair value of $388,000. The fair value is based on market rates for the issuance of our debt. The Company determined the fair value of its Notes outstanding are classified as Level 2 in the fair value hierarchy.
Available-for-sale securities and executive deferred compensation plan trust
When available, the Company uses quoted market prices to determine the fair value of available-for-sale securities; such items are classified in Level 1 of the fair-value hierarchy. These securities primarily consist of exchange-traded equity securities.
For mortgage-backed and asset-backed debt securities and bonds, the Company generally uses quoted prices for recent trading activity of assets with similar characteristics to the debt security or bond being valued. The securities and bonds priced using such methods are generally classified as Level 2. The obligations related to the deferred compensation plan trust are classified as Level 1 in the fair value hierarchy because the fair value is determined using quoted prices for identical instruments in active markets.
Foreign currency exchange contracts
Derivatives include foreign currency forward contracts. Our foreign currency forward contracts are valued using an income approach (Level 2) based on the spot rate less the contract rate multiplied by the notional amount. We consider counterparty credit risk in the valuation of our derivatives. However, counterparty credit risk did not impact the valuation of our derivatives during the first quarter of 2015.
Fuel price derivative instruments
The majority of fuel price derivative instruments entered into by the Company are executed over-the-counter and are valued using internal valuation techniques, as no quoted market prices exist for such instruments. The valuation technique and inputs depend on the type of derivative and the nature of the underlying instrument. The principal technique used to value these instruments is a comparison of the spot price of the underlying instrument to its related futures curve adjusted for the Company’s assumptions of volatility and present value, where appropriate. The fair values of derivative contracts reflect the expected cash the Company will pay or receive upon settlement of the respective contracts.
The key inputs depend upon the type of derivative and the nature of the underlying instrument and include interest rate yield curves, the spot price of the underlying instruments, volatility, and correlation. The item is placed in either Level 2 or Level 3 depending on the observability of the significant inputs to the model. Correlation and inputs with longer tenures are generally less observable.
Fuel price derivative instruments – diesel. The assumptions used in the valuation of the diesel fuel price derivative instruments use both observable and unobservable inputs. There is a lack of price transparency with respect to forward prices for diesel fuel. Such unobservable inputs are significant to the diesel fuel derivative contract valuation methodology.
Quantitative Information About Level 3 Fair Value Measurements. The significant unobservable inputs used in the fair value measurement of the Company’s diesel fuel price derivative instruments designated as Level 3 as of March 31, 2015, are as follows:
	Fair Value				Valuation		Unobservable Input		Range
					Technique				$ per gallon
Fuel price derivatives – diesel	$	10,261			Option model		Future retail price of diesel fuel after March 31, 2015		$3.72 – 3.86
Sensitivity to Changes in Significant Unobservable Inputs. As presented in the table above, the significant unobservable inputs used in the fair value measurement of the Company’s diesel fuel price derivative instruments are the future retail price of diesel fuel from the second quarter of 2015 through the first quarter of 2016. Significant changes in these unobservable inputs in isolation would result in a significant change in the fair value measurement.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Accumulated Other Comprehensive Income
	11	Accumulated Other Comprehensive Income
	A reconciliation of accumulated other comprehensive income for the three month periods ended March 31, 2015 and 2014, is as follows:
		2015						2014
		Unrealized			Foreign			Unrealized			Foreign
		Gains and			Currency			Gains and			Currency
		Losses on			Items			Losses on			Items
		Available-						Available-
		for-Sale						for-Sale
		Securities						Securities
	Beginning balance	$	(129	)	$	(50,452	)	$	(433	)	$	(15,062	)
	Other comprehensive income (loss)	91			(24,683		)	74			13,999
	Ending balance	$	(38	)	$	(75,135	)	$	(359	)	$	(1,063	)
	No amounts were reclassified from accumulated other comprehensive income in the periods presented.
	The change in foreign currency items is primarily due to the foreign currency translation of non-cash assets such as goodwill and other intangible assets related to the Company's foreign subsidiaries.
	The total tax effect on accumulated unrealized losses, as of March 31, 2015, was $2,155, and the total tax effect on accumulated unrealized losses, as of March 31, 2014, was $831.

Noncontrolling_interests

Non-controlling interests	3 Months Ended
	Mar. 31, 2015
Noncontrolling Interest [Abstract]
Non-controlling interests
	12	Non-controlling interests
	On August 30, 2012, the Company acquired a 51 percent ownership interest in UNIK. Redeemable non-controlling interest was measured at fair value at the date of acquisition. The redeemable non-controlling interest is reported on the Company’s unaudited condensed consolidated balance sheets as “Redeemable non-controlling interest."
	A reconciliation of redeemable non-controlling interest for the three month periods ended March 31, 2015 and March 31, 2014, is as follows:
		Three months ended
		March 31,
		2015			2014
	Balance, beginning of period	$	16,590		$	18,729
	Net loss attributable to redeemable non-controlling interest	(11		)	(167		)
	Currency translation adjustment	(2,932		)	776
	Ending balance	$	13,647		$	19,338
	On December 1, 2014, WEX acquired the assets of ExxonMobil's Esso portfolio in Europe through its majority owned subsidiary, WEX Europe Services Limited. The Company formed this entity during 2013 and has 75 percent ownership.
	A reconciliation of non-controlling interest for the three month periods ended March 31, 2015 and March 31, 2014 is as follows:
		Three months ended
		March 31,
		2015			2014
	Balance, beginning of period	$	17,396		$	519
	Net loss attributable to non-controlling interest	(2,301		)	(295		)
	Currency translation adjustment	(1,451		)	4
	Ending balance	$	13,644		$	228

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes
	13	Income Taxes
	Undistributed earnings of certain foreign subsidiaries of the Company amounted to $8,731 at March 31, 2015, and $7,733 at December 31, 2014. These earnings are considered to be indefinitely reinvested, and accordingly, no U.S. federal and state income taxes have been provided thereon. Upon distribution of these earnings in the form of dividends or otherwise, the Company would be subject to both U.S. income taxes (subject to an adjustment for foreign tax credits) and withholding taxes payable to the various foreign countries. The Company has determined that the amount of taxes attributable to these undistributed earnings is not practicably determinable.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies
	14	Commitments and Contingencies
	Litigation
	The Company is involved in pending litigation in the ordinary course of business. In the opinion of management, such litigation will not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows.

Restructuring

Restructuring	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring
	15	Restructuring
	In the first quarter of 2015 the Company recorded restructuring costs of approximately $8,559 related to the Company's global review of operations. This global review identified certain initiatives to further streamline the business, improve the Company's efficiency, and to globalize the Company's operations, all with an objective to improve scale and increase profitability going forward. The costs related to this initiative are employee termination benefits and are expected to be paid during the remainder of 2015 and 2016. The Company has determined that the amount of expense related to this program is probable and estimable and has recorded the impact on the unaudited condensed consolidated statements of income and in Accrued expenses on the unaudited condensed consolidated balance sheet.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information
	16	Segment Information
	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 in deciding how to allocate resources and in assessing performance. The Company’s chief operating decision maker is its Chief Executive Officer. The operating segments are reviewed separately because each operating segment represents a strategic business unit that generally offers different products and serves different markets. The operating segments are aggregated into the two reportable segments as described below.
	The Company’s chief operating decision maker evaluates the operating results of the Company’s operating and reportable segments based upon revenues and adjusted pre-tax income before NCI which adjusts income before income taxes for fair value changes of fuel price derivative instruments, the amortization of acquired intangible assets, the expense associated with stock-based compensation, acquisition related expenses and adjustments, the net impact of tax rate changes on the Company’s deferred tax asset and related changes in the tax-receivable agreement, deferred loan costs associated with the extinguishment of debt, certain non-cash asset impairment charges, gains on the extinguishment of a portion of the tax receivable agreement, restructuring charges, gain or losses on divestitures and adjustments attributable to non-controlling interests.
	The Company operates in two reportable segments, Fleet Payment Solutions and Other Payment Solutions. The Fleet Payment Solutions segment provides customers with payment and transaction processing services specifically designed for the needs of vehicle fleet customers. This segment also provides information management services to these fleet customers. The Other Payment Solutions segment provides customers with a payment processing solution for their corporate purchasing and transaction monitoring needs. Revenue in this segment is derived from our corporate purchase cards and virtual and prepaid card products. The corporate purchase card products are used by businesses to facilitate purchases of products and to utilize the Company’s information management capabilities. The results of operations for Evolution1 are presented in the Company's Other Payment Solutions segment. Evolution1 contributed net revenues of approximately $24,828 and are not significant to the adjusted pre-tax income before NCI. Management is currently evaluating its internal reporting structure and is in the process of determining the impact of the changes on the Company’s segment and goodwill reporting.
	Net realized and unrealized losses on derivative instruments are allocated to the Fleet Payment Solutions segment in the computation of segment results for internal evaluation purposes. Total assets are not allocated to the segments.
	The following table presents the Company’s reportable segment results on an adjusted pre-tax net income before NCI basis for the three months ended March 31, 2015 and 2014:
		Total			Operating			Depreciation		Adjusted Pre-Tax Income before NCI
		Revenues			Interest			and
					Expense			Amortization
	Three months ended March 31, 2015
	Fleet payment solutions	$	128,490		$	740		$	7,458	$	44,928
	Other payment solutions	73,795			839			1,770		21,663
	Total	$	202,285		$	1,579		$	9,228	$	66,591
	Three months ended March 31, 2014
	Fleet payment solutions	$	135,435		$	524		$	6,377	$	47,674
	Other payment solutions	46,633			764			354		17,272
	Total	$	182,068		$	1,288		$	6,731	$	64,946
	The following table reconciles adjusted pre-tax income before NCI to income before income taxes:
		Three months ended
		March 31,
		2015			2014
	Adjusted pre-tax income before NCI	$	66,591		$	64,946
	Unrealized (loss) gain on fuel price derivatives	(9,345		)	2,823
	Amortization of acquired intangible assets	(12,159		)	(8,287		)
	Stock-based compensation	(3,218		)	(2,423		)
	Restructuring	(8,559		)	—
	Gain on divestiture	1,215			—
	Income before income taxes	$	34,525		$	57,059

Subsequent_Event

Subsequent Event	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Event
	17	Subsequent Event
	On April 28, 2015, the Company entered into a one year receivables securitization facility using as collateral certain receivables at our two of our Australian subsidiaries. Under the terms of the securitization facility, the Company sells an undivided ownership interest in the Australian receivables for up to AUD125,000 (approximately USD $100,000) in cash proceeds, subject to additional contributions.
	The Company will pay a variable interest rate on the outstanding balance based on the Australian Bank Bill Rate, which as of April 30, 2015, was 2.20 percent, plus a margin payable monthly in arrears and an arrangement fee upon closing of the securitization facility.

New_Accounting_Standards_Polic

New Accounting Standards (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	In May 2014, the FASB issued ASU 2014-09 related to revenue recognition, which will supersede most existing revenue recognition guidance under U.S. GAAP. The new revenue recognition standard requires entities to recognize revenue for the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In April 2015, the Board tentatively decided to defer the original effective date of interim and annual reporting periods beginning after December 15, 2016 by one year. As a result, public entities would apply the new revenue standard to annual reporting periods beginning after December 15, 2017. Early adoption is permitted, but not before the original public entity effective date (that is, annual periods beginning after December 15, 2016). The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method.
	In April 2015, the FASB issued ASU 2015-03 related to the simplification of the presentation of debt issuance costs. The standard requires entities to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the costs is reported as interest expense. The new standard is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted. Entities would apply the new guidance retrospectively to all prior periods and provide the applicable disclosures for a change in accounting principal: (i) the nature of and reason for the change in accounting principle; (ii) the transition method; (iii) a description of the prior-period information that has been retrospectively adjusted; and, (iv) the effect of the change on the financial statement line item. The adoption of this standard affects presentation only and, as such, is not expected to have a material impact on the Company's consolidated financial statements.
	In April 2015, the FASB issued ASU 2015-04 related to using a practical expedient for the measurement date of an employer’s defined benefit obligation and plan assets.The new standard gives an entity with a fiscal year-end that does not coincide with a calendar month-end the ability, as a practical expedient, to measure its defined benefit retirement obligations and related plan assets as of the month-end that is closest to its fiscal year-end. Additionally, the new standard provides guidance on accounting for (i) contributions to the plan and (ii) significant events that require a remeasurement (e.g., a plan amendment, settlement, or curtailment) that occur during the period between a month-end measurement date and the employer’s fiscal year-end. An entity should reflect the effects of those contributions or significant events in the measurement of the retirement benefit obligations and related plan assets. As a separate practical expedient, an entity may elect to measure the effects of a significant event as of the calendar month-end closest to the date of the significant event. The new standard is effective for interim and annual reporting periods beginning after December 15, 2015. Early adoption is permitted and the new standard should be applied prospectively. The Company does not believe that the adoption of ASU 2014-05 will have a material impact on its results of operations.
	In April 2015, the FASB issued ASU 2015-05 related to customer's accounting for fees paid in a cloud computing arrangement. The new standard requires a customer to determine whether a cloud computing arrangement contains a software license. If the arrangement contains a software license, the customer would account for the fees related to the software license element in a manner consistent with how the acquisition of other software licenses is accounted for under accounting guidance for internal-use software. Early adoption is permitted for all entities. An entity can elect to adopt the amendments either (i) prospectively to all arrangements entered into or materially modified after the effective date or (ii) retrospectively. The Company does not believe that the adoption of ASU 2014-05 will have a material impact on its results of operations.

Basis_of_Presentation_Basis_of

Basis of Presentation Basis of Presentation (Tables)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Glossary of Terms in Document	The following is provided to aid the reader and provide a reference point when reviewing the unaudited condensed consolidated financial statements.
	2011 Credit Agreement	Credit agreement entered into on May 23, 2011 among the Company, as borrower, WEX Card Holdings Australia Pty Ltd, a wholly-owned subsidiary of the Company, as specified designated borrower, Bank of America, N.A., as administrative agent and letter of credit issuer, and the other lenders party thereto
	2013 Credit Agreement	Amended and restated credit agreement entered into on January 18, 2013 by and among the Company and certain of our subsidiaries, as borrowers, and WEX Card Holdings Australia Pty Ltd, as specified designated borrower, with a lending syndicate
	2014 Amendment Agreement	Amendment and restatement agreement entered into on August 22, 2014, among the Company, the lenders party thereto, and Bank of America, N.A., as administrative agent
	2014 Credit Agreement	Second amended and restated credit agreement entered into on August 22, 2014, by and among the Company and certain of our subsidiaries, as borrowers, and WEX Card Holding Australia
	Adjusted Net Income or ANI	A non-GAAP metric that adjusts net earnings attributable to WEX Inc. for fair value changes of fuel-price related derivative instruments, the amortization of purchased intangibles, the expense associated with stock-based compensation, acquisition related expenses, the net impact of tax rate changes on the Company’s deferred tax asset and related changes in the tax-receivable agreement, deferred loan costs associated with the extinguishment of debt, certain non-cash asset impairment charges, restructuring charges, gains on the extinguishment of a portion of the tax receivable agreement, gain or losses on divestitures and adjustments attributable to non-controlling interests, as well as the related tax impacts of the adjustments
	ASU 2014-09	Accounting Standards Update No. 2014-09 Revenue from Contracts with Customers (Topic 606)
	ASU 2015-03	Accounting Standards Update No. 2015-03 Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs
	ASU 2015-04	Accounting Standards Update No. 2015-04 Compensation—Retirement Benefits (Topic 715): Practical Expedient for the Measurement Date of an Employer’s Defined Benefit Obligation and Plan Assets
	ASU 2015-05	Accounting Standards Update No. 2015-05 Intangibles—Goodwill and Other— Internal-Use Software (Subtopic 350-40) Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement
	Company	WEX Inc. and all entities included in the unaudited condensed consolidated financial statements
	European fleet business	Primarily includes our European commercial fleet card portfolio acquired by the Company from ExxonMobil on December 1, 2014 ("Esso portfolio in Europe")
	Evolution1	EB Holdings Corp. and its subsidiaries which includes Evolution1, Inc., acquired by the Company on July 16, 2014
	FASB	Financial Accounting Standards Board
	GAAP	Generally Accepted Accounting Principles in the United States
	Indenture	Indenture dated as of January 30, 2013 among the Company, the guarantors listed therein, and The Bank of New York Mellon Trust Company, N.A., as trustee
	NCI	Non-controlling interests
	Notes	$400 million notes with a 4.75% fixed rate, issued on January 30, 2013
	NOW deposits	Negotiable order of withdrawal deposits
	Pacific Pride	Pacific Pride Services, LLC, previously a wholly owned subsidiary, sold on July 29, 2014
	rapid! PayCard	rapid! PayCard, previously a line of business of the Company, sold on January 7, 2015
	SEC	Securities and Exchange Commission
	UNIK	UNIK S.A., the Company's Brazilian 51 percent majority owned subsidiary
	WEX	WEX Inc.

Business_Acquisitions_Business

Business Acquisitions Business Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The following is a summary of the preliminary allocation of the purchase price to the assets and liabilities acquired:
	Consideration paid (net of cash acquired)	$	532,174
	Less:
	Accounts receivable	8,418
	Accounts payable	(175		)
	Deferred tax liabilities, net	(68,516		)
	Other tangible assets and liabilities, net	(3,585		)
	Acquired software and developed technology(a)	70,000
	Customer relationships(b)	211,000
	Trade name(c)	7,900
	Trade name(d)	11,000
	Recorded goodwill	$	296,132
	(a)	Weighted average life – 6.4 years.
	(b)	Weighted average life – 9.7 years.
	(c)	Weighted average life – 9.9 years.
	(d)	Indefinite-lived
	The following is a summary of the preliminary allocation of the purchase price to the assets and liabilities acquired:
	Consideration paid (net of cash acquired and consideration receivable)	$	377,618
	Less:
	Accounts receivable	303,376
	Other tangible assets and liabilities, net	(11,097		)
	Licensing agreements(a)	36,979
	Customer relationships(b)	7,720
	Recorded goodwill	$	40,640
	(a)	Weighted average life – 4.6 years.
	(b)	Weighted average life – 7.2 years.
Business Acquisition, Pro Forma Information	The following represents unaudited pro forma operational results as if Evolution1 had been included in the Company’s unaudited condensed consolidated statements of operations as of the beginning of the fiscal period ended:
		Three months ended
		March 31,
		2014
	Revenue	$	205,270
	Net income attributable to WEX Inc.	$	38,581
	Pro forma net income attributable to WEX Inc. per common share:
	Net income per share – basic	$	0.99
	Net income per share – diluted	$	0.99

Sale_of_Subsidiary_and_Assets_

Sale of Subsidiary and Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The following is a summary of the allocation of the assets and liabilities sold:
	Consideration received	$	49,664
	Less:
	Expenses associated with the sale	1,340
	Accounts receivable	48,699
	Accounts payable	(53,001		)
	Other tangible assets and liabilities, net	828
	Customer relationships	3,727
	Trademarks and trade name	1,444
	Goodwill	19,137
	Gain on sale	$	27,490

Reserves_for_Credit_Losses_Tab

Reserves for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Changes in Reserves for Credit Losses Related to Accounts Receivable	The following table presents changes in reserves for credit losses related to accounts receivable:
		Three months ended March 31,
		2015			2014
	Balance, beginning of period	$	13,919		$	10,396
	Provision for credit losses	3,914			9,090
	Charge-offs	(7,367		)	(8,107		)
	Recoveries of amounts previously charged-off	1,210			1,697
	Currency translation	(163		)	87
	Balance, end of period	$	11,513		$	13,163

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Goodwill	The changes in goodwill during the first three months of 2015 were as follows:
		Fleet Payment Solutions Segment			Other			Total
					Payment
					Solutions
					Segment
	Gross goodwill, January 1, 2015	$	759,998		$	374,424		$	1,134,422
	Impact of foreign currency translation	(15,095		)	(3,920		)	(19,015		)
	Sale of rapid! PayCard	—			(12,386		)	(12,386		)
	Gross goodwill, March 31, 2015	744,903			358,118			1,103,021
	Accumulated impairment, March 31, 2015	(1,337		)	(16,171		)	(17,508		)
	Net goodwill, March 31, 2015	$	743,566		$	341,947		$	1,085,513
Changes in Other Intangible Assets	The changes in other intangible assets during the first three months of 2015 were as follows:
		Net			Amortization			Disposals			Impact of			Net Carrying
		Carrying									foreign			Amount, March 31, 2015
		Amount,									currency
		January 1,									translation
		2015
	Definite-lived intangible assets
	Acquired software and developed technology	$	119,509		$	(3,062	)	$	—		$	(1,984	)	$	114,463
	Customer relationships	309,824			(7,695		)	(2,296		)	(4,450		)	295,383
	Licensing agreements	35,715			(1,089		)	—			(3,792		)	30,834
	Patent	1,245			(27		)	—			(107		)	1,111
	Trade names	15,373			(286		)	(723		)	(198		)	14,166
	Indefinite-lived intangible assets
	Trademarks and trade names	16,379			—			—			(274		)	16,105
	Total	$	498,045		$	(12,159	)	$	(3,019	)	$	(10,805	)	$	472,062
Estimated Amortization Expense Related to Definite Lived Intangible Assets	The following table presents the estimated amortization expense related to the definite-lived intangible assets listed above for the remainder of 2015 and for each of the five succeeding fiscal years:
	Remaining 2015	$	35,889
	2016	$	47,444
	2017	$	47,129
	2018	$	43,702
	2019	$	40,417
	2020	$	37,025
Other Intangible Assets	Other intangible assets, net consist of the following:
		31-Mar-15									31-Dec-14
		Gross			Accumulated			Net Carrying			Gross			Accumulated			Net Carrying
		Carrying			Amortization			Amount			Carrying			Amortization			Amount
		Amount									Amount
	Definite-lived intangible assets
	Acquired software and developed technology	$	147,365		$	(32,902	)	$	114,463		$	150,458		$	(30,949	)	$	119,509
	Customer relationships	381,810			(86,427		)	295,383			394,316			(84,492		)	309,824
	Licensing agreements	32,225			(1,391		)	30,834			36,100			(385		)	35,715
	Patent	2,543			(1,432		)	1,111			2,697			(1,452		)	1,245
	Trademarks and trade names	16,555			(2,389		)	14,166			17,786			(2,413		)	15,373
		$	580,498		$	(124,541	)	455,957			$	601,357		$	(119,691	)	481,666
	Indefinite-lived intangible assets
	Trademarks and trade names							16,105									16,379
	Total							$	472,062								$	498,045

Earnings_per_Share_Tables

Earnings per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Reconciliation of Income and Share Data Used in Basic and Diluted Earnings Per Share Computations	The following is a reconciliation of the income and share data used in the basic and diluted earnings per share computations for the three months ended March 31, 2015 and 2014:
		Three months ended
		March 31,
		2015		2014
	Net earnings attributable to WEX Inc. available for common stockholders – Basic and Diluted	$	22,345	$	36,542
	Weighted average common shares outstanding – Basic	38,859		38,966
	Unvested restricted stock units	76		153
	Stock options	17		26
	Weighted average common shares outstanding – Diluted	38,952		39,145

Derivative_Instruments_Tables

Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Put and Call Option Contracts

As of March 31, 2015, the Company had the following put and call option contracts related to the Company's commodity fuel price derivatives, which are not designated as hedging contracts and settle on a monthly basis:

Aggregate

Notional

Amount

(gallons) (a)

Fuel price derivative instruments – unleaded fuel

Option contracts settling April 2015 – March 2016

23,947

Fuel price derivative instruments – diesel

Option contracts settling April 2015 – March 2016

11,790

Total fuel price derivative instruments

35,737

(a)

The settlement of the put and call option contracts is based upon the New York Mercantile Exchange’s New York Harbor Reformulated Gasoline Blendstock for Oxygenate Blending and the U.S. Department of Energy’s weekly retail on-highway diesel fuel price for the month.

Schedule of Forward and Spot Contracts related to Foreign Exchange Contracts

As of March 31, 2015, the Company had the following forward and spot contracts related to its foreign currency exchange contracts, which are not designated as hedging contracts and settle at various dates within approximately 40 days:

Aggregate

Notional

Amount

($)

Foreign currency exchange contracts

366,991

Location and Amounts of Derivative Fair Values in Condensed Consolidated Balance Sheets

The following table presents information on the location and amounts of derivative fair values in the unaudited condensed consolidated balance sheets:

Derivatives Classified as Assets

Derivatives Classified as Liabilities

31-Mar-15

31-Dec-14

31-Mar-15

31-Dec-14

Derivatives Not Designated as Hedging Instruments

Balance

Fair

Balance

Fair

Balance

Fair

Balance

Fair

Sheet

Value

Sheet

Value

Sheet

Value

Sheet

Value

Location

Location

Location

Location

Commodity contracts

Fuel price

$

31,624

Fuel price

$

40,969

Fuel price

$

—

Fuel price

$

—

derivatives,

derivatives,

derivatives,

derivatives,

at fair value

at fair value

at fair value

at fair value

Foreign currency exchange contracts

Other assets

$

2,752

Other assets

$

—

Other liabilities

$

—

Other liabilities

$

—

Location and Amounts of Derivative Gains and Losses in Condensed Consolidated Statements of Income

The following table presents information on the location and amounts of derivative gains and losses in the unaudited condensed consolidated statements of income:

Amount of Gain or

(Loss) Recognized in

Income on  Derivative

Derivatives Not Designated as Hedging Instruments

Location of Gain or (Loss)

Three months ended March 31,

Recognized in

Income on Derivative

2015

2014

Commodity contracts

Net realized and unrealized gain (loss) on fuel price derivatives

$

2,749

$

1,845

Foreign currency exchange contracts

Net unrealized gain (loss) on currency forward contracts

$

2,752

$

—

Fair_Value_Tables

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Assets and Liabilities Measured at Fair Value	The following table presents the Company’s assets and liabilities that are measured at fair value and the related hierarchy levels as of December 31, 2014:
						Fair Value Measurements
						at Reporting Date Using
		31-Dec-14				Quoted Prices				Significant		Significant
						in Active				Other		Unobservable
						Markets for				Observable		Inputs
						Identical Assets				Inputs		(Level 3)
						(Level 1)				(Level 2)
	Assets:
	Mortgage-backed securities	$	810			$	—			$	810	$	—
	Asset-backed securities	1,165				—				1,165		—
	Municipal bonds	554				—				554		—
	Equity securities	16,411				16,411				—		—
	Total available-for-sale securities	$	18,940			$	16,411			$	2,529	$	—
	Executive deferred compensation plan trust (a)	$	5,927			$	5,927			$	—	$	—
	Fuel price derivatives – unleaded fuel (b)	$	29,120			$	—			$	29,120	$	—
	Fuel price derivatives – diesel (b)	11,849				—				—		11,849
	Total fuel price derivatives	$	40,969			$	—			$	29,120	$	11,849
	(a)	The fair value of these instruments is recorded in Other assets.
	(b)	The balance sheet presentation combines unleaded fuel and diesel fuel positions.
	The following table presents the Company’s assets that are measured at fair value and the related hierarchy levels as of March 31, 2015:
						Fair Value Measurements
						at Reporting Date Using
		31-Mar-15				Quoted Prices				Significant		Significant
						in Active				Other		Unobservable
						Markets for				Observable		Inputs
						Identical				Inputs		(Level 3)
						Assets				(Level 2)
						(Level 1)
	Assets:
	Mortgage-backed securities	$	788			$	—			$	788	$	—
	Asset-backed securities	1,079				—				1,079		—
	Municipal bonds	494				—				494		—
	Equity securities	16,650				16,650				—		—
	Total available-for-sale securities	$	19,011			$	16,650			$	2,361	$	—
	Executive deferred compensation plan trust (a)	$	6,406			$	6,406			$	—	$	—
	Foreign currency exchange contracts(a)	$	2,752			$	—			$	2,752	$	—
	Fuel price derivatives – unleaded fuel (b)	$	21,363			$	—			$	21,363	$	—
	Fuel price derivatives – diesel (b)	10,261				—				—		10,261
	Total fuel price derivatives	$	31,624			$	—			$	21,363	$	10,261
	(a)	The fair value of these instruments is recorded in Other assets.
	(b)	The balance sheet presentation combines unleaded fuel and diesel fuel positions.
Reconciliation of Beginning and Ending Balances for Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs	The following table presents a reconciliation of the beginning and ending balances for assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three months ended:
			March 31, 2015				March 31, 2014
			Fuel Price				Fuel Price
			Derivatives –				Derivatives –
			Diesel				Diesel
	Beginning balance		$	11,848			$	(2,142	)
	Total gains and (losses) – realized/unrealized
	Included in earnings (a)		(1,587		)		1,519
	Included in other comprehensive income		—				—
	Purchases, issuances and settlements		—				—
	Transfers (in)/out of Level 3		—				—
	Ending balance		$	10,261			$	(623	)
	(a)Gains and losses (realized and unrealized) associated with fuel price derivatives, included in earnings for the three months ended March 31, 2015 and 2014, are reported in net realized and unrealized losses on fuel price derivatives on the unaudited condensed consolidated statements of income.
Quantitative Information About Level Three Fair Value Measurements	The significant unobservable inputs used in the fair value measurement of the Company’s diesel fuel price derivative instruments designated as Level 3 as of March 31, 2015, are as follows:
		Fair Value				Valuation		Unobservable Input		Range
						Technique				$ per gallon
	Fuel price derivatives – diesel	$	10,261			Option model		Future retail price of diesel fuel after March 31, 2015		$3.72 – 3.86

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Reconciliation of Accumulated Other Comprehensive Income	A reconciliation of accumulated other comprehensive income for the three month periods ended March 31, 2015 and 2014, is as follows:
		2015						2014
		Unrealized			Foreign			Unrealized			Foreign
		Gains and			Currency			Gains and			Currency
		Losses on			Items			Losses on			Items
		Available-						Available-
		for-Sale						for-Sale
		Securities						Securities
	Beginning balance	$	(129	)	$	(50,452	)	$	(433	)	$	(15,062	)
	Other comprehensive income (loss)	91			(24,683		)	74			13,999
	Ending balance	$	(38	)	$	(75,135	)	$	(359	)	$	(1,063	)

Noncontrolling_interests_Table

Non-controlling interests (Tables)	3 Months Ended
	Mar. 31, 2015
Noncontrolling Interest [Abstract]
Redeemable Noncontrolling Interest	A reconciliation of redeemable non-controlling interest for the three month periods ended March 31, 2015 and March 31, 2014, is as follows:
		Three months ended
		March 31,
		2015			2014
	Balance, beginning of period	$	16,590		$	18,729
	Net loss attributable to redeemable non-controlling interest	(11		)	(167		)
	Currency translation adjustment	(2,932		)	776
	Ending balance	$	13,647		$	19,338
Summary of Noncontrolling Interests	A reconciliation of non-controlling interest for the three month periods ended March 31, 2015 and March 31, 2014 is as follows:
		Three months ended
		March 31,
		2015			2014
	Balance, beginning of period	$	17,396		$	519
	Net loss attributable to non-controlling interest	(2,301		)	(295		)
	Currency translation adjustment	(1,451		)	4
	Ending balance	$	13,644		$	228

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Reportable Segment Results	The following table presents the Company’s reportable segment results on an adjusted pre-tax net income before NCI basis for the three months ended March 31, 2015 and 2014:
		Total			Operating			Depreciation		Adjusted Pre-Tax Income before NCI
		Revenues			Interest			and
					Expense			Amortization
	Three months ended March 31, 2015
	Fleet payment solutions	$	128,490		$	740		$	7,458	$	44,928
	Other payment solutions	73,795			839			1,770		21,663
	Total	$	202,285		$	1,579		$	9,228	$	66,591
	Three months ended March 31, 2014
	Fleet payment solutions	$	135,435		$	524		$	6,377	$	47,674
	Other payment solutions	46,633			764			354		17,272
	Total	$	182,068		$	1,288		$	6,731	$	64,946
Reconciliation of Adjusted Net Income to Net Income	The following table reconciles adjusted pre-tax income before NCI to income before income taxes:
		Three months ended
		March 31,
		2015			2014
	Adjusted pre-tax income before NCI	$	66,591		$	64,946
	Unrealized (loss) gain on fuel price derivatives	(9,345		)	2,823
	Amortization of acquired intangible assets	(12,159		)	(8,287		)
	Stock-based compensation	(3,218		)	(2,423		)
	Restructuring	(8,559		)	—
	Gain on divestiture	1,215			—
	Income before income taxes	$	34,525		$	57,059

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Details) (USD $)	Mar. 31, 2015	Aug. 30, 2012
Unik [Member]
Debt Instrument [Line Items]
Percent of ownership interest acquired	51.00%	51.00%
Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	4.75%
Debt instrument, aggregate principal amount	400,000,000

Business_Acquisitions_Addition

Business Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended		5 Months Ended	0 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Dec. 01, 2014	Jul. 16, 2014
ESSO Portfolio [Member]
Business Acquisition [Line Items]
Percent of ownership interest acquired			75.00%
Consideration paid (net of cash acquired)		$80,000	$377,618
Increase (decrease) in goodwill	549
Increase (decrease) in accounts receivable	-2
Increase (decrease) in other tangible assets and liabilities, net	-547
Evolution1 [Member]
Business Acquisition [Line Items]
Consideration paid (net of cash acquired)				532,174
Payments to acquire business, gross				$532,174

Business_Acquisitions_Summary_

Business Acquisitions - Summary of Esso Portfolio Acquisition (Details) (USD $)	3 Months Ended	5 Months Ended	0 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 01, 2014	Dec. 01, 2014	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill				$1,085,513	$1,116,914
ESSO Portfolio [Member]
Business Acquisition [Line Items]
Consideration paid (net of cash acquired and consideration receivable)	80,000	377,618
Accounts receivable		303,376	303,376
Other tangible assets and liabilities, net		-11,097	-11,097
Goodwill		40,640	40,640
ESSO Portfolio [Member] | Licensing agreements [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets		36,979	36,979
Weighted average life			4 years 7 months 6 days
ESSO Portfolio [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets		$7,720	$7,720
Weighted average life			7 years 2 months 12 days

Business_Acquisitions_Summary_1

Business Acquisitions - Summary of Evolution1 Acquisition (Details) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Jul. 16, 2014		Mar. 31, 2015	Dec. 31, 2014
Less:
Recorded goodwill			$1,085,513	$1,116,914
Evolution1 [Member]
Business Acquisition [Line Items]
Consideration paid (net of cash acquired)	532,174
Less:
Accounts receivable	8,418
Accounts payable	-175
Deferred tax liabilities, net	-68,516
Other tangible assets and liabilities, net	-3,585
Recorded goodwill	296,132
Acquired software and developed technology [Member] | Evolution1 [Member]
Less:
Finite-lived intangible assets	70,000	[1]
Weighted average life	6 years 4 months 24 days
Customer relationships [Member] | Evolution1 [Member]
Less:
Finite-lived intangible assets	211,000	[2]
Weighted average life	9 years 8 months 12 days
Trademarks and trade names [Member] | Evolution1 [Member]
Less:
Finite-lived intangible assets	7,900	[3]
Indefinite-lived intangible assets	$11,000	[4]
Weighted average life	9 years 10 months 24 days
[1]	Weighted average life – 6.4 years.
[2]	Weighted average life – 9.7 years.
[3]	Weighted average life – 9.9 years.
[4]	Indefinite-lived

Business_Acquisitions_Pro_Form

Business Acquisitions - Pro Forma Results of Operations of Evolution1 (Details) (Evolution1 [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014
Evolution1 [Member]
Business Acquisition [Line Items]
Revenue	$205,270
Net income attributable to WEX Inc.	$38,581
Pro forma net income attributable to WEX Inc. per common share:
Net income per share – basic (in usd per share)	$0.99
Net income per share – diluted (in usd per share)	$0.99

Sale_of_Subsidiary_and_Assets_1

Sale of Subsidiary and Assets - Additional Information (Details) (USD $)	3 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Jan. 07, 2015	Jul. 29, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on divestiture	$1,215	$0
Rapid! Paycard [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of subsidiary			20,000
Gain on divestiture			1,215
Pacific Pride [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of subsidiary				49,664
Gain on divestiture				$27,490

Sale_of_Subsidiary_and_Assets_2

Sale of Subsidiary and Assets - Summary of Sale of Pacific Pride LLC (Details) (USD $)	3 Months Ended		0 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Jul. 29, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on divestiture	$1,215	$0
Pacific Pride [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received			49,664
Expenses associated with the sale			1,340
Accounts receivable			48,699
Accounts payable			-53,001
Other tangible assets and liabilities, net			828
Goodwill			19,137
Gain on divestiture			27,490
Pacific Pride [Member] | Customer relationships [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Intangible assets			3,727
Pacific Pride [Member] | Trademarks and trade names [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Intangible assets			$1,444

Reserves_for_Credit_Losses_Add

Reserves for Credit Losses - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Concentration Risk [Line Items]
Trade receivable payments terms (30 days or less)	30 days
Outstanding balance of total trade accounts receivable	95.00%	96.00%
Percentage of trade accounts receivables less than 60 days past due	98.00%	99.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, number of customers	0
Concentration risk, percentage	7.00%

Reserves_for_Credit_Losses_Cha

Reserves for Credit Losses - Changes in Reserves for Credit Losses Related to Accounts Receivable (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$13,919	$10,396
Provision for credit losses	3,914	9,090
Charge-offs	-7,367	-8,107
Recoveries of amounts previously charged-off	1,210	1,697
Currency translation	-163	87
Balance, end of period	$11,513	$13,163

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Changes In Goodwill (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Gross goodwill, January 1, 2015	$1,134,422
Impact of foreign currency translation	-19,015
Sale of rapid! PayCard	-12,386
Gross goodwill, March 31, 2015	1,103,021
Accumulated impairment, March 31, 2015	-17,508
Net goodwill, March 31, 2015	1,085,513	1,116,914
Fleet Payment Solutions Segment [Member]
Goodwill [Roll Forward]
Gross goodwill, January 1, 2015	759,998
Impact of foreign currency translation	-15,095
Sale of rapid! PayCard	0
Gross goodwill, March 31, 2015	744,903
Accumulated impairment, March 31, 2015	-1,337
Net goodwill, March 31, 2015	743,566
Other Payment Solutions Segment [Member]
Goodwill [Roll Forward]
Gross goodwill, January 1, 2015	374,424
Impact of foreign currency translation	-3,920
Sale of rapid! PayCard	-12,386
Gross goodwill, March 31, 2015	358,118
Accumulated impairment, March 31, 2015	-16,171
Net goodwill, March 31, 2015	$341,947

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$0

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Changes in Intangible Assets (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Definite-lived intangible assets
Net Carrying Amount, January 1, 2015	$481,666
Amortization	-12,159	-8,287
Net Carrying Amount, March 31, 2015	455,957
Indefinite-lived intangible assets
Net Carrying Amount, January 1, 2015	498,045
Disposals	-3,019
Impact of foreign currency translation	-10,805
Net Carrying Amount, March 31, 2015	472,062
Trademarks and trade names [Member]
Indefinite-lived intangible assets
Net Carrying Amount, January 1, 2015	16,379
Impact of foreign currency translation	-274
Net Carrying Amount, March 31, 2015	16,105
Acquired software and developed technology [Member]
Definite-lived intangible assets
Net Carrying Amount, January 1, 2015	119,509
Amortization	-3,062
Disposals	0
Impact of foreign currency translation	-1,984
Net Carrying Amount, March 31, 2015	114,463
Customer relationships [Member]
Definite-lived intangible assets
Net Carrying Amount, January 1, 2015	309,824
Amortization	-7,695
Disposals	-2,296
Impact of foreign currency translation	-4,450
Net Carrying Amount, March 31, 2015	295,383
Licensing agreements [Member]
Definite-lived intangible assets
Net Carrying Amount, January 1, 2015	35,715
Amortization	-1,089
Disposals	0
Impact of foreign currency translation	-3,792
Net Carrying Amount, March 31, 2015	30,834
Patent [Member]
Definite-lived intangible assets
Net Carrying Amount, January 1, 2015	1,245
Amortization	-27
Disposals	0
Impact of foreign currency translation	-107
Net Carrying Amount, March 31, 2015	1,111
Trade names [Member]
Definite-lived intangible assets
Net Carrying Amount, January 1, 2015	15,373
Amortization	-286
Disposals	-723
Impact of foreign currency translation	-198
Net Carrying Amount, March 31, 2015	$14,166

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets - Estimated Amortization Expense Related to Definite Lived Intangible Assets (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining 2015	$35,889
2016	47,444
2017	47,129
2018	43,702
2019	40,417
2020	$37,025

Goodwill_and_Other_Intangible_6

Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Other Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived intangible assets	$580,498	$601,357
Accumulated Amortization, Definite-lived intangible assets	-124,541	-119,691
Net Carrying Amount, Definite-lived intangible assets	455,957	481,666
Other intangible assets, net	472,062	498,045
Acquired software and developed technology [Member]
Other Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived intangible assets	147,365	150,458
Accumulated Amortization, Definite-lived intangible assets	-32,902	-30,949
Net Carrying Amount, Definite-lived intangible assets	114,463	119,509
Customer relationships [Member]
Other Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived intangible assets	381,810	394,316
Accumulated Amortization, Definite-lived intangible assets	-86,427	-84,492
Net Carrying Amount, Definite-lived intangible assets	295,383	309,824
Licensing agreements [Member]
Other Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived intangible assets	32,225	36,100
Accumulated Amortization, Definite-lived intangible assets	-1,391	-385
Net Carrying Amount, Definite-lived intangible assets	30,834	35,715
Patent [Member]
Other Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived intangible assets	2,543	2,697
Accumulated Amortization, Definite-lived intangible assets	-1,432	-1,452
Net Carrying Amount, Definite-lived intangible assets	1,111	1,245
Trademarks and trade names [Member]
Other Intangible Assets [Line Items]
Gross Carrying Amount, Definite-lived intangible assets	16,555	17,786
Accumulated Amortization, Definite-lived intangible assets	-2,389	-2,413
Net Carrying Amount, Definite-lived intangible assets	14,166	15,373
Net Carrying Amount, Indefinite-lived intangible assets	$16,105	$16,379

Earnings_per_Share_Reconciliat

Earnings per Share - Reconciliation of Income and Share Data Used in Basic and Diluted Earnings Per Share Computations (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net earnings attributable to WEX Inc. available for common stockholders – Basic and Diluted	$22,345	$36,542
Weighted average common shares outstanding – Basic (in shares)	38,859	38,966
Unvested restricted stock units (in shares)	76	153
Stock options (in shares)	17	26
Weighted average common shares outstanding – Diluted (in shares)	38,952	39,145

Put_and_Call_Option_Contracts_

- Put and Call Option Contracts (Detail)	3 Months Ended
	Mar. 31, 2015
	gal
Derivative [Line Items]
Total fuel price derivative instruments, gallons	35,737,000	[1]
Unleaded Fuel [Member]
Derivative [Line Items]
Total fuel price derivative instruments, gallons	23,947,000	[1]
Diesel [Member]
Derivative [Line Items]
Total fuel price derivative instruments, gallons	11,790,000	[1]
[1]	The settlement of the put and call option contracts is based upon the New York Mercantile Exchange’s New York Harbor Reformulated Gasoline Blendstock for Oxygenate Blending and the U.S. Department of Energy’s weekly retail on-highway diesel fuel price for the month.

Derivative_Instruments_Put_and

Derivative Instruments - Put and Call Option Contracts (Phantom) (Detail)	3 Months Ended
	Mar. 31, 2015
Minimum [Member] | Unleaded Fuel [Member]
Derivative [Line Items]
Derivative settlement date	2015-04	[1]
Minimum [Member] | Diesel [Member]
Derivative [Line Items]
Derivative settlement date	2015-04	[1]
Maximum [Member] | Unleaded Fuel [Member]
Derivative [Line Items]
Derivative settlement date	2016-03	[1]
Maximum [Member] | Diesel [Member]
Derivative [Line Items]
Derivative settlement date	2016-03	[1]
[1]	The settlement of the put and call option contracts is based upon the New York Mercantile Exchange’s New York Harbor Reformulated Gasoline Blendstock for Oxygenate Blending and the U.S. Department of Energy’s weekly retail on-highway diesel fuel price for the month.

Derivative_Instruments_Forward

Derivative Instruments - Forward and Spot Contracts on Foreign Currency Exchange Contracts (Details) (Foreign Currency Exchange Contract [Member], Derivatives Not Designated as Hedging Instruments [Member], USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Foreign Currency Exchange Contract [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Aggregate Notional Amount	$366,991

Derivative_Instruments_Locatio

Derivative Instruments - Location and Amounts of Derivative Fair Values in Condensed Consolidated Balance Sheets (Detail) (Derivatives Not Designated as Hedging Instruments [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Commodity contracts [Member] | Fuel Price Derivatives at Fair Value [Member]
Derivatives, Fair Value [Line Items]
Derivatives Classified as Assets	$31,624	$40,969
Derivatives Classified as Liabilities	0	0
Foreign Currency Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Derivatives Classified as Assets	2,752	0
Derivatives Classified as Liabilities	$0	$0

Derivative_Instruments_Locatio1

Derivative Instruments - Location and Amounts of Derivative Gains and Losses in Condensed Consolidated Statements of Income (Detail) (Derivatives Not Designated as Hedging Instruments [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Commodity contracts [Member] | Net realized and unrealized gains (losses) on fuel price derivatives [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$2,749	$1,845
Foreign Currency Exchange Contract [Member] | Net unrealized gain (loss) on currency forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Income on Derivative	$2,752	$0

Financing_and_Other_Debt_Addit

Financing and Other Debt - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Lines of credit	815,872,000	$901,564,000
Unik [Member]
Debt Instrument [Line Items]
Outstanding debt	6,160,000	7,975,000
Weighted average annual interest rate	13.40%	13.90%
2014 Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Lines of credit	336,497,000
Maximum borrowing capacity	700,000,000
2014 Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Option One [Member]
Debt Instrument [Line Items]
Margin on variable rate	2.25%
2014 Credit Agreement [Member] | Domestic Line of Credit [Member] | Prime Rate [Member] | Interest Rate Option Two [Member]
Debt Instrument [Line Items]
Margin on variable rate	1.75%
2014 Credit Agreement [Member] | Foreign Line of Credit [Member] | Eurocurrency Rate [Member] | Interest Rate Option Two [Member]
Debt Instrument [Line Items]
Margin on variable rate	2.25%
2014 Credit Agreement [Member] | Credit Facility Term Loans [Member]
Debt Instrument [Line Items]
Lines of credit	479,375,000	486,250,000
2014 Credit Agreement [Member] | Credit Facility Term Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Margin on variable rate	2.25%
Loan Participations and Assignments [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount	45,000,000	45,000,000
Loan Participations and Assignments [Member] | Minimum [Member]
Debt Instrument [Line Items]
Range of daily balance	0
Loan Participations and Assignments [Member] | Maximum [Member]
Debt Instrument [Line Items]
Range of daily balance	45,000,000
Loan Participations and Assignments [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Margin on variable rate	2.25%

Fair_Value_Assets_and_Liabilit

Fair Value - Assets and Liabilities Measured at Fair Value and Related Hierarchy Levels (Detail) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value Measurements [Line Items]
Total available-for-sale securities	$19,011		$18,940
Executive deferred compensation plan trust	6,406	[1]	5,927	[1]
Foreign currency exchange contracts	2,752	[1]
Total fuel price derivatives	31,624		40,969
Mortgage-backed securities [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	788		810
Asset-backed securities [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	1,079		1,165
Municipal bonds [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	494		554
Equity securities [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	16,650		16,411
Fuel price derivatives – unleaded fuel [Member]
Fair Value Measurements [Line Items]
Total fuel price derivatives	21,363	[2]	29,120	[2]
Fuel price derivatives – diesel [Member]
Fair Value Measurements [Line Items]
Total fuel price derivatives	10,261	[2]	11,849	[2]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	16,650		16,411
Executive deferred compensation plan trust	6,406	[1]	5,927	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity securities [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	16,650		16,411
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	2,361		2,529
Foreign currency exchange contracts	2,752	[1]
Total fuel price derivatives	21,363		29,120
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed securities [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	788		810
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed securities [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	1,079		1,165
Significant Other Observable Inputs (Level 2) [Member] | Municipal bonds [Member]
Fair Value Measurements [Line Items]
Total available-for-sale securities	494		554
Significant Other Observable Inputs (Level 2) [Member] | Fuel price derivatives – unleaded fuel [Member]
Fair Value Measurements [Line Items]
Total fuel price derivatives	21,363	[2]	29,120	[2]
Significant Other Observable Inputs (Level 3) [Member]
Fair Value Measurements [Line Items]
Total fuel price derivatives	10,261		11,849
Significant Other Observable Inputs (Level 3) [Member] | Fuel price derivatives – diesel [Member]
Fair Value Measurements [Line Items]
Total fuel price derivatives	$10,261	[2]	$11,849	[2]
[1]	The fair value of these instruments is recorded in Other assets.
[2]	The balance sheet presentation combines unleaded fuel and diesel fuel positions.

Fair_Value_Reconciliation_of_B

Fair Value - Reconciliation of Beginning and Ending Balances for Assets (Liabilities) Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level Three) (Detail) (Fuel price derivatives – diesel [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Fuel price derivatives – diesel [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$11,848		($2,142)
Included in earnings	-1,587	[1]	1,519	[1]
Included in other comprehensive income	0		0
Ending balance	$10,261		($623)
[1]	Gains and losses (realized and unrealized) associated with fuel price derivatives, included in earnings for the three months ended March 31, 2015 and 2014, are reported in net realized and unrealized losses on fuel price derivatives on the unaudited condensed consolidated statements of income.

Fair_Value_Additional_Informat

Fair Value - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]
Notes outstanding, carrying value	$400,000	$400,000
Notes outstanding, fair value	$397,000	$388,000

Fair_Value_Quantitative_Inform

Fair Value - Quantitative Information About Level Three Fair Value Measurements (Detail) (Fuel price derivatives – diesel [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$10,261
Option Model [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Future retail price of diesel (in dollars per gallon)	3.72
Option Model [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Future retail price of diesel (in dollars per gallon)	3.86

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income - Reconciliation of Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			($50,581)
Ending balance	-75,173		-50,581
Unrealized Gains and Losses on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	-129	-433
Other comprehensive income (loss)	91	74
Ending balance	-38	-359
Accumulated Other Comprehensive Income (Loss), Tax	2,155	831
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	-50,452	-15,062
Other comprehensive income (loss)	-24,683	13,999
Ending balance	($75,135)	($1,063)

Noncontrolling_interests_Addit

Non-controlling interests - Additional Information (Detail)	Mar. 31, 2015	Aug. 30, 2012	Nov. 08, 2013
Unik [Member]
Noncontrolling Interest [Line Items]
Percent of ownership interest acquired	51.00%	51.00%
WEX Europe Services [Member]
Noncontrolling Interest [Line Items]
Percent of ownership interest acquired			75.00%

Noncontrolling_interests_Redee

Non-controlling interests - Redeemable Noncontrolling Interests (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Reconcilliation of Redeemable Noncontrolling Interest [Roll Forward]
Balance, beginning of period	$16,590	$18,729
Net loss attributable to redeemable non-controlling interest	-11	-167
Currency translation adjustment	-2,932	776
Ending balance	13,647	19,338
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, beginning of period	17,396
Net loss attributable to non-controlling interest	-2,312	-462
Ending balance	13,644
WEX Europe Services [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, beginning of period	17,396	519
Net loss attributable to non-controlling interest	-2,301	-295
Currency translation adjustment	-1,451	4
Ending balance	$13,644	$228

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]
Undistributed earnings of certain foreign subsidiaries	$8,731	$7,733

Restructuring_Additional_Infor

Restructuring - Additional Information (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Restructuring and Related Activities [Abstract]
Restructuring	$8,559	$0

Segment_Information_Additional

Segment Information - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
	Segment
Segment Reporting Information [Line Items]
Number of reportable segments	2
Revenues	$202,285	$182,068
Evolution1 [Member]
Segment Reporting Information [Line Items]
Revenues	$24,828

Segment_Information_Reportable

Segment Information - Reportable Segment Results (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Disclosure [Line Items]
Total Revenues	$202,285	$182,068
Adjusted Pre-Tax Income before NCI	66,591	64,946
Operating Segments [Member]
Segment Reporting Disclosure [Line Items]
Total Revenues	202,285	182,068
Operating Interest Expense	1,579	1,288
Depreciation and Amortization	9,228	6,731
Operating Segments [Member] | Fleet payment solutions [Member]
Segment Reporting Disclosure [Line Items]
Total Revenues	128,490	135,435
Operating Interest Expense	740	524
Depreciation and Amortization	7,458	6,377
Adjusted Pre-Tax Income before NCI	44,928	47,674
Operating Segments [Member] | Other payment solutions [Member]
Segment Reporting Disclosure [Line Items]
Total Revenues	73,795	46,633
Operating Interest Expense	839	764
Depreciation and Amortization	1,770	354
Adjusted Pre-Tax Income before NCI	$21,663	$17,272

Segment_Information_Reconcilia

Segment Information - Reconciliation of Adjusted Pre-Tax Income Before NCI to Income Before Income Taxes (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting [Abstract]
Adjusted Pre-Tax Income before NCI	$66,591	$64,946
Unrealized gain (loss) on fuel price derivatives	-9,345	2,823
Amortization of acquired intangible assets	-12,159	-8,287
Stock-based compensation	-3,218	-2,423
Restructuring	-8,559	0
Gain on divestiture	1,215	0
Income before income taxes	$34,525	$57,059

Subsequent_Event_Additional_In

Subsequent Event - Additional Information (Details) (Subsequent Event [Member])	0 Months Ended
	Apr. 28, 2015	Apr. 28, 2015	Apr. 30, 2015
	USD ($)	AUD	Australian Bank Bill Rate [Member]
Subsequent Event [Line Items]
Term of securitization facility	1 year	1 year
Maximum transacted amount under agreement	$100,000,000	125,000,000
Interest rate at period end			2.20%