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Off-Balance Sheet Arrangements (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of factoring receivables | $ 4,000,000,000.0 |  | $ 6,000,000,000.0 |  |
Gain (loss) on sale of factoring receivables | (1,100,000) |  | (1,700,000) |  |
Operating interest | 2,656,000 | $ 7,463,000 | 5,413,000 | $ 14,846,000 |
WEX Europe Services |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of factoring receivables | 164,300,000 | 190,700,000 | 314,200,000 | 360,900,000 |
Gain (loss) on sale of factoring receivables | (900,000) | (1,200,000) | (1,800,000) | (2,300,000) |
Amount of transferred receivables in excess of established credit limit | 1,000,000.0 |  | 1,000,000.0 |  | $ 200,000
WEX Latin America |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gain (loss) on sale of factoring receivables | 3,500,000 |  | 7,200,000 |  |
WEX Latin America Securitization Facility | WEX Latin America |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sale of factoring receivables | $ 14,900,000 |  | 35,600,000 |  |
Equity contributions to investment fund |  |  | $ 0 |  |
Operating interest |  | $ 2,300,000 |  | $ 4,400,000 |

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