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Derivative Instruments - Fuel Derivative Program (Details) | Mar. 31, 2016
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Price Risk Derivative |
Derivative [Line Items] |
Percentage hedged by fuel price derivatives | 20.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Percentage Hedged by Fuel Price Derivatives + References No definition available. + Details
Name: | wex_PercentageHedgedbyFuelPriceDerivatives
Namespace Prefix: | wex_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |