Redeemable Noncontrolling Interests (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Reconcilliation of Redeemable Noncontrolling Interest [Roll Forward]
Balance, beginning of period	$ 18,729	$ 21,662
Net loss attributable to non-controlling interest	(167)	(112)
Currency translation adjustment	776	305
Ending balance	19,338	21,855
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, beginning of period	519
Net loss attributable to non-controlling interest	462	112
Ending balance	228
WEX Europe Services [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance, beginning of period	519
Net loss attributable to non-controlling interest	(295)
Currency translation adjustment	4
Ending balance	$ 228