v2.4.1.9
Tax Receivable Agreement - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended 0 Months Ended
Jun. 26, 2009
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2005
Jul. 26, 2007
Tax Receivable Agreement [Line Items]            
Percentage of remittance of cash savings         85.00%wex_PercentageOfRemittanceOfCashSavings  
Pursuant of tax receivable prepayment to third party $ 51,000wex_PursuantOfTaxReceivablePrepaymentToThirdParty          
Charge to non-operating expense   $ 1,331us-gaap_NonoperatingIncomeExpense $ 33us-gaap_NonoperatingIncomeExpense $ 2,089us-gaap_NonoperatingIncomeExpense    
Realogy Corporation            
Tax Receivable Agreement [Line Items]            
Acquired right to receive percentage of payment           62.50%wex_PercentageOfRightToReceivePaymentsUnderTaxReceivableAgreement
/ wex_TaxReceivableAgreementAxis
= wex_RealogyCorporationMember
Wyndham Worldwide Corporation            
Tax Receivable Agreement [Line Items]            
Acquired right to receive percentage of payment           37.50%wex_PercentageOfRightToReceivePaymentsUnderTaxReceivableAgreement
/ wex_TaxReceivableAgreementAxis
= wex_WyndhamWorldwideCorporationMember
Percentage of right to receive payments under ratification agreement 31.875%wex_PercentageOfRightToReceivePaymentsUnderRatificationAgreement
/ wex_TaxReceivableAgreementAxis
= wex_WyndhamWorldwideCorporationMember