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Non-controlling Interests - Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reconcilliation of Redeemable Noncontrolling Interest [Roll Forward]        
Balance, beginning of period   $ 14,992   $ 16,590
Net gain attributable to redeemable non-controlling interest   531   1,190
Currency translation adjustment   (1,953)   (4,210)
Adjustment to redemption value   9,413   9,413
Excess purchase amount over redemption value   23,035   23,035
Purchase of non-controlling interest   (46,018)   (46,018)
Ending balance   0   0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Balance, beginning of period     $ 12,437  
Net loss attributable to non-controlling interest $ (493) 203 (1,013) (2,201)
Ending balance 11,614   11,614  
WEX Europe Services        
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]        
Balance, beginning of period 12,052 13,165 12,437 17,396
Net loss attributable to non-controlling interest (493) (328) (1,013) (3,391)
Currency translation adjustment 55 (505) 190 (1,673)
Ending balance $ 11,614 $ 12,332 $ 11,614 $ 12,332