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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