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Redeemable Non-Controlling Interest - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Mar. 05, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Noncontrolling Interest [Line Items]
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value		$ 17,720	$ 0		$ 41,400
Accretion of non-controlling interest		$ (17,720)		$ 0	$ (17,720)	$ 0
Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value			$ (41,400)
Discovery Benefits
Noncontrolling Interest [Line Items]
Ownership percentage by noncontrolling interest	4.90%
Discovery Benefits | Additional Paid-in Capital
Noncontrolling Interest [Line Items]
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value	$ 41,400
Discovery Benefits | Non–Controlling Interest
Noncontrolling Interest [Line Items]
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value	$ 41,400
Minimum | Discovery Benefits
Noncontrolling Interest [Line Items]
Call rights, exercise period					5 years
Maximum | Discovery Benefits
Noncontrolling Interest [Line Items]
Call rights, exercise period					7 years

X

- Definition

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

+ References

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