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Subsequent Events - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - Derivatives Not Designated as Hedging Instruments - Subsequent Event $ in Thousands	Nov. 03, 2016 USD ($)
Tranche A
Subsequent Event [Line Items]
Notional amount (USD)	$ 400,000
Amortization	5.00%
Fixed interest rate	1.108%
Tranche B
Subsequent Event [Line Items]
Notional amount (USD)	$ 150,000
Fixed interest rate	1.125%
Tranche C
Subsequent Event [Line Items]
Notional amount (USD)	$ 250,000
Fixed interest rate	0.896%

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Definition

Derivative, Amortization, Percent

+ References

No definition available.

+ Details

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Namespace Prefix:	wex_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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