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Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2016
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.
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, WEX Card Holding Australia Pty Ltd., as designated borrower, and Bank of America, N.A., as administrative agent on behalf of consenting lenders
2016 Credit Agreement |  | Credit agreement entered into on July 1, 2016 by and among the Company and certain of our subsidiaries, as borrowers, WEX Card Holding Australia Pty Ltd., as designated borrower, and Bank of America, N.A., as administrative agent on behalf of the lenders
Adjusted Net Income or ANI |  | A non-GAAP metric that adjusts net earnings attributable to shareholders to exclude acquisition and divestiture related items, debt restructuring and debt issuance cost amortization, stock-based compensation, restructuring and other costs related to certain outsourcing initiatives, changes in unrealized fuel price derivatives, net foreign currency remeasurement gains and losses, non-cash adjustments related to our tax receivable agreement, reserves for regulatory penalties, similar adjustments attributed to our non-controlling interest and certain tax related items.
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 2015-16 |  | Accounting Standards Update No. 2015-16 Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments
ASU 2016-01 |  | Accounting Standards Update No. 2016-01 Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities
ASU 2016-02 |  | Accounting Standards Update No. 2016-02 Leases (Topic 842)
ASU 2016-09 |  | Accounting Standards Update No. 2016-09 Compensation-Stock Compensation (Topical 718): Improvements to Employee Share-Based Payment Accounting
ASU 2016-13 |  | Accounting Standards Update No. 2016-13 Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments
ASU 2016-15 |  | Accounting Standards Update No. 2016-15 Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments
Australian Securitization Subsidiary |  | Southern Cross WEX 2015-1 Trust, a bankruptcy-remote subsidiary consolidated by the Company
Average expenditure per payment processing transaction |  | Average total dollars of spend in a funded fuel transaction
Benaissance |  | Benaissance, a leading provider of integrated SaaS technologies and services for healthcare premium billing, payment and workflow management, acquired by the Company on November 18, 2015
Company |  | WEX Inc. and all entities included in the unaudited condensed consolidated financial statements
EFS |  | Electronic Funds Source, LLC, a provider of customized corporate payment solutions for fleet and corporate customers with a focus on the large and mid-sized over-the-road fleet segments. On July 1, 2016, the Company acquired WP Mustang Topco LLC, the indirect parent of Electronic Funds Source, LLC and Warburg Pincus Private Equity XI (Lexington), LLC, an affiliated entity, from investment funds affiliated with Warburg Pincus LLC.
Esso portfolio in Europe |  | European commercial fleet card portfolio acquired from ExxonMobil
European Securitization Subsidiary |  | Gorham Trade Finance B.V., a bankruptcy-remote subsidiary consolidated by the Company
Evolution1 |  | EB Holdings Corp. and its subsidiaries which includes Evolution1, Inc., acquired by the Company on July 16, 2014
FASB |  | Financial Accounting Standards Board
FX |  | Foreign exchange
GAAP |  | Generally Accepted Accounting Principles in the United States
Indenture |  | The Notes were issued pursuant to an 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 interest
NOL |  | Net operating loss
Notes |  | $400 million notes with a 4.75% fixed rate, issued on January 30, 2013
NOW deposits |  | Negotiable order of withdrawal deposits
Over-the-road |  | Typically heavy trucks traveling long distances
Payment solutions purchase volume |  | Total amount paid by customers for transactions
Payment processing transactions |  | Funded payment transactions where the Company maintains the receivable for total purchase
PPG |  | Price per gallon of fuel
rapid! PayCard |  | rapid! PayCard, previously a line of business of the Company, sold on January 7, 2015
SaaS |  | Software-as-a-service
SEC |  | Securities and Exchange Commission
Ticking fees |  | A fee incurred by a borrower to compensate the lender to delay a financing arrangement and hold a commitment of funds for the borrower for a period of time
Total fleet transactions |  | Total of transaction processing and payment processing transactions
Transaction processing transactions |  | Unfunded payment transactions where the Company is the processor and only has receivables for the processing fee
UNIK |  | UNIK S.A., the Company's Brazilian subsidiary
WEX |  | WEX Inc.
WEX Europe Services |  | Consists primarily of our European commercial fleet card portfolio acquired by the Company from ExxonMobil on December 1, 2014
WEX Health |  | Evolution1 and Benaissance, collectively
Schedule of Error Corrections and Prior Period Adjustments | As a result of the adoption, the December 31, 2015 unaudited condensed consolidated balance sheet is restated as follows:
| Previously Reported |  | Effect of Accounting Principle Adoption |  | Adjusted
Unaudited condensed consolidated balance sheet |  |  |  |  |
Other assets | $ | 225,581 |  |  | $ | (10,037 | ) |  | $ | 215,544 |
Total assets | $ | 3,857,946 |  |  | $ | (10,037 | ) |  | $ | 3,847,909 |
Revolving line-of-credit facilities and term loan, net | $ | 669,755 |  |  | $ | (4,837 | ) |  | $ | 664,918 |
Notes outstanding, net | $ | 400,000 |  |  | $ | (5,200 | ) |  | $ | 394,800 |
Total liabilities | $ | 2,762,265 |  |  | $ | (10,037 | ) |  | $ | 2,752,228 |
Total liabilities and stockholders’ equity | $ | 3,857,946 |  |  | $ | (10,037 | ) |  | $ | 3,847,909 |

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22644-107794 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22658-107794 + Details
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