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Basis of Presentation and Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Advertising Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Line Items] |  |  |
WEX Fleet Europe impairment |  | $ 53,378 |
Goodwill | $ 2,908,057 | 2,688,138 | $ 2,441,201
Advertising expense | 20,600 | 17,400 | 17,900
Fleet Solutions |  |  |
Goodwill [Line Items] |  |  |
WEX Fleet Europe impairment | 53,400 | 53,378 |
Goodwill | $ 1,326,332 | 1,338,471 | $ 1,374,020
Fleet Solutions | Go Fuel Card |  |  |
Goodwill [Line Items] |  |  |
Goodwill |  | $ 65,800 |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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