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Business Acquisitions - Pro Forma Results of Operations of Evolution1 (Details) - Evolution1 [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Business Acquisition [Line Items]    
Revenue $ 225,181 $ 653,192
Net income attributable to WEX Inc. $ 69,889 $ 141,206
Pro forma net income attributable to WEX Inc. per common share:    
Net income per share – basic (in usd per share) $ 1.80 $ 3.63
Net income per share – diluted (in usd per share) $ 1.79 $ 3.62