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Segment Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
|
3 Months Ended |
12 Months Ended |
6 Months Ended |
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
Segment
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2014
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| Concentration Risk [Line Items] |
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| Number of reportable segments |
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2us-gaap_NumberOfReportableSegments |
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| Net revenues |
$ 211,864us-gaap_SalesRevenueNet |
$ 222,134us-gaap_SalesRevenueNet |
$ 201,581us-gaap_SalesRevenueNet |
$ 182,068us-gaap_SalesRevenueNet |
$ 182,283us-gaap_SalesRevenueNet |
$ 191,525us-gaap_SalesRevenueNet |
$ 178,285us-gaap_SalesRevenueNet |
$ 165,370us-gaap_SalesRevenueNet |
$ 817,647us-gaap_SalesRevenueNet |
$ 717,463us-gaap_SalesRevenueNet |
$ 623,151us-gaap_SalesRevenueNet |
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| Accounts Receivable | Customer Concentration Risk |
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| Concentration Risk [Line Items] |
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| Number of customers |
0wex_ConcentrationRiskNumberofCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember |
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0wex_ConcentrationRiskNumberofCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember |
|
|
0wex_ConcentrationRiskNumberofCustomers
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember |
| Concentration Risk, Percentage (less than 7 percent for total revenues) |
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10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember |
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| Sales Revenue, Net | Customer Concentration Risk |
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| Concentration Risk [Line Items] |
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| Concentration Risk, Percentage (less than 7 percent for total revenues) |
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|
7.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember |
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| International |
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| Concentration Risk [Line Items] |
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| Net revenues |
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50,923us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= wex_InternationalMember |
28,536us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= wex_InternationalMember |
12,815us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= wex_InternationalMember |
|
| Maximum | International | Sales Revenue, Net | Geographic Concentration Risk |
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| Concentration Risk [Line Items] |
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| Concentration Risk, Percentage (less than 7 percent for total revenues) |
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3.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementGeographicalAxis
= wex_InternationalMember |
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| Evolution1 |
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| Concentration Risk [Line Items] |
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| Net revenues |
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$ 35,976us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= wex_EvolutionOneMember |