v2.4.1.9
Fair Value Fair Value - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jul. 01, 2013
Fair Value Measurements [Line Items]        
Carrying value $ 400,000us-gaap_NotesPayable      
Fair value of notes 388,000us-gaap_NotesPayableFairValueDisclosure      
Payment of contingent consideration 0wex_PaymentOfContingentConsiderationFinancing 0wex_PaymentOfContingentConsiderationFinancing 8,486wex_PaymentOfContingentConsiderationFinancing  
Unik Financial Services        
Fair Value Measurements [Line Items]        
Payment of contingent consideration       $ 511wex_PaymentOfContingentConsiderationFinancing
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember