v2.4.1.9

Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2014
Furniture, fixtures and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment	3 years
Furniture, fixtures and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment	5 years
Computer Software | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment	18 months
Computer Software | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment	7 years
Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment	5 years

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=wex_FurnitureFixturesAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: