v2.4.1.9
Business Acquisitions and Other Intangible Assets Acquisitions - Summary of CorporatePay Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 11, 2012
Business Acquisition [Line Items]        
Consideration paid (net of cash acquired) $ 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  
CorporatePay        
Business Acquisition [Line Items]        
Consideration paid (net of cash acquired)       27,783us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= wex_CorporatepayMember
Accounts receivable       1,585us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= wex_CorporatepayMember
Accounts payable       (629)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= wex_CorporatepayMember
Other tangible liabilities, net       (4,040)wex_BusinessAcquisitionPurchasePriceAllocationOtherAssetsLiabilitiesNet
/ us-gaap_BusinessAcquisitionAxis
= wex_CorporatepayMember
Acquired software and developed technology       8,233wex_BusinessAcquisitionPurchasePriceAllocationSoftware
/ us-gaap_BusinessAcquisitionAxis
= wex_CorporatepayMember		 [2]
Customer relationships       1,614wex_BusinessAcquisitionPurchasePriceAllocationCustomerRelationships
/ us-gaap_BusinessAcquisitionAxis
= wex_CorporatepayMember		 [3]
Trademarks and trade name       1,453wex_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsTradeNamesAndTrademarks
/ us-gaap_BusinessAcquisitionAxis
= wex_CorporatepayMember		 [4]
Recorded goodwill       $ 19,567us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= wex_CorporatepayMember
CorporatePay | Acquired software and developed technology        
Business Acquisition [Line Items]        
Weighted average life       6 years 2 months 12 days
CorporatePay | Customer relationships        
Business Acquisition [Line Items]        
Weighted average life       6 years 3 months 18 days
CorporatePay | Trade name        
Business Acquisition [Line Items]        
Weighted average life       5 years 3 months 18 days
[1] The prior year amounts have been adjusted to reflect changes as a result of finalizing the purchase accounting.
[2] Weighted average life – 6.2 years.
[3] Weighted average life – 6.3 years.
[4] Weighted average life – 5.3 years.