v2.4.1.9
Business Acquisitions and Other Intangible Assets Acquisitions - Summary of ESSO Card Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 01, 2014
Business Acquisition [Line Items]        
Consideration paid (net of cash acquired and consideration receivable) $ 891,725us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 11,277us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 402,475us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Recorded goodwill 1,116,365us-gaap_Goodwill [1] 819,892us-gaap_Goodwill [1] 847,986us-gaap_Goodwill  
ESSO Portfolio        
Business Acquisition [Line Items]        
Consideration paid (net of cash acquired and consideration receivable)       378,470us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= wex_ESSOPortfolioMember
Accounts receivable       303,378us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= wex_ESSOPortfolioMember
Other tangible assets and liabilities, net       (9,698)wex_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherTangibleAssetsLiabilities
/ us-gaap_BusinessAcquisitionAxis
= wex_ESSOPortfolioMember
Recorded goodwill       40,091us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wex_ESSOPortfolioMember
ESSO Portfolio | Licensing agreements        
Business Acquisition [Line Items]        
Finite-lived intangible assets       36,979us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= wex_ESSOPortfolioMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 [2]
Weighted average life       4 years 7 months
ESSO Portfolio | Customer relationships        
Business Acquisition [Line Items]        
Finite-lived intangible assets       $ 7,720us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= wex_ESSOPortfolioMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [3]
Weighted average life       7 years 2 months
[1] The prior year amounts have been adjusted to reflect changes as a result of finalizing the purchase accounting.
[2] Weighted average life – 4.6 years.
[3] Weighted average life – 7.2 years.