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Redeemable Non-Controlling Interest - Narrative (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 05, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Noncontrolling Interest [Line Items] |  |  |
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value |  | $ (40,312) | $ 57,315
Discovery Benefits, Inc. |  |  |
Noncontrolling Interest [Line Items] |  |  |
Ownership percentage by noncontrolling interest | 4.90% | 4.90% |
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value | $ 41,400 |  |
Call rights, exercise period |  | 7 years |
Discovery Benefits, Inc. | Non-Controlling Interest |  |  |
Noncontrolling Interest [Line Items] |  |  |
Adjustment to redeemable non-controlling interest to reflect WEX Health at fair value | $ 41,400 |  |

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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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