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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

X

- 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.

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