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Noncontrolling Interest - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Nov. 08, 2013 WEX Europe Services [Member]	Aug. 30, 2012 WEX Europe Services [Member]
Noncontrolling Interest [Line Items]
Redeemable non-controlling interest	$ 19,338	$ 18,729	$ 21,855	$ 21,662
Percent of ownership interest acquired					75.00%	51.00%

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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