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v3.20.4

Tax Receivable Agreement (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |
Tax receivable agreement, liability | $ 2.0 | $ 3.7
Payments for tax receivable agreement | $ 1.3 | $ 8.9

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Payments For Tax Receivable Agreement + References No definition available. + Details
Name: | wex_PaymentsForTaxReceivableAgreement
Namespace Prefix: | wex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Tax Receivable Agreement, Liability + References No definition available. + Details
Name: | wex_TaxReceivableAgreementLiability
Namespace Prefix: | wex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant