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Off-Balance Sheet Arrangements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Proceeds from sale of factoring receivables | $ 1,309,200 |  |  | $ 1,309,200 |  |
Loss on sale of factoring receivables | 400 |  |  |  |  |
Operating interest | 1,807 | $ 12,051 |  | 15,540 | $ 26,586 |
WEX Europe Services |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Proceeds from sale of factoring receivables | 171,200 |  |  | 532,100 |  |
Loss on sale of factoring receivables | 1,100 | $ 1,200 |  | 3,500 | $ 2,600 |
Amount of factoring receivables | 58,600 |  |  | 58,600 |  | $ 61,800
Amount of factoring receivables, portion in excess of the established credit limit | 600 |  |  | 600 |  | 3,700
WEX Latin America |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loss on sale of factoring receivables | (3,200) |  |  |  |  |
WEX Latin America Securitization Facility | WEX Latin America |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Securitized debt | 30,100 |  | $ 30,100 | 30,100 |  | $ 19,000
Operating interest |  |  | $ 4,400 |  |  |
Receivables derecognized | $ 31,400 |  |  | $ 31,400 |  |

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