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Redeemable Non-Controlling Interest - Narrative (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 05, 2019	Dec. 31, 2020	Dec. 31, 2019
Noncontrolling Interest [Line Items]
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value		$ (40,312)	$ 57,315
Discovery Benefits, Inc.
Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling interest	4.90%	4.90%
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value	$ 41,400
Call rights, exercise period		7 years
Discovery Benefits, Inc. | Non-Controlling Interest
Noncontrolling Interest [Line Items]
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value	$ 41,400

X

- Definition

Amount of decrease (increase) in additional paid in capital (APIC) for the increase in carrying amount of redeemable preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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- Definition

Noncontrolling Interest, Covenant, Call Rights, Exercise Period

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