v2.4.1.9
Business Acquisitions and Other Intangible Assets Acquisitions - Additional Information - Acquisition of UNIK (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
Aug. 30, 2012
Aug. 30, 2012
Business Acquisition [Line Items]            
Payment of contingent consideration $ 0wex_PaymentOfContingentConsiderationFinancing $ 0wex_PaymentOfContingentConsiderationFinancing $ 8,486wex_PaymentOfContingentConsiderationFinancing      
Unik Financial Services            
Business Acquisition [Line Items]            
Percent of ownership interest acquired 51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember
      51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember
51.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember
Value of newly issued shares           22,800us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember
Contingent consideration     313us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember
  991us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember
991us-gaap_BusinessCombinationContingentConsiderationLiability
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember
Payment of contingent consideration       511wex_PaymentOfContingentConsiderationFinancing
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember
   
Period to acquire remaining shares         3 years  
Cash paid on acquisition of debt $ 19,600wex_BusinessAcquisitionCostOfAcquiredEntityCashPaidToDebtHolders
/ us-gaap_BusinessAcquisitionAxis
= wex_UnikSAMember