CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (12,269)	$ 16,208
Foreign currency translation	(41,404)	4,371
Comprehensive (loss) income	(53,673)	20,579
Less: Comprehensive income attributable to non-controlling interests	894	36
Comprehensive (loss) income attributable to WEX Inc.	$ (54,567)	$ 20,543