v2.4.0.8

Summary of Allocation of Purchase Price to Assets and Liabilities Acquired (Detail)
In Thousands, unless otherwise specified

Sep. 30, 2013

CorporatePay

USD ($)

May 11, 2012

CorporatePay

USD ($)

May 11, 2012

CorporatePay

GBP (£)

Sep. 30, 2013

UNIK

USD ($)

Aug. 30, 2012

UNIK

USD ($)

Aug. 30, 2012

UNIK

BRL

Sep. 30, 2013

Fleet One

USD ($)

Business Acquisition [Line Items]

Total UNIK value

$ 44,701

Less: Redeemable noncontrolling interest

21,904

Consideration paid (net of cash)

27,783

27,783

17,000

22,797

376,258

Estimated earn out

991

1,000

2,000

Cash

1,566

Accounts receivable

1,585

11,726

152,527

Accounts payable

(629)

(12,640)

(151,647)

Other tangible liabilities, net

(4,040)

(36,866)

(693)

Acquired software

8,233

^[1]

14,193

^[1]

35,000

^[2]

Customer relationships

1,614

^[3]

15,171

^[4]

74,000

^[5]

Trademarks and trade name

1,453

^[6]

1,272

^[5]

4,000

^[5]

Recorded goodwill

$ 19,567

$ 28,375

$ 263,071

[1]	Weighted average life – 6.2 years.
[2]	Weighted average life – 6.7 years.
[3]	Weighted average life – 6.3 years.
[4]	Weighted average life – 5.9 years.
[5]	Weighted average life – 5.5 years.
[6]	Weighted average life – 5.3 years.

X

- Details

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

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 35

-Paragraph 1

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Business Acquisition, Purchase Price Allocation, Customer Relationships

+ References

No definition available.

+ Details

Name:	wex_BusinessAcquisitionPurchasePriceAllocationCustomerRelationships
Namespace Prefix:	wex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Business Acquisition Purchase Price Allocation, Including Portion Attributable to Noncontrolling Interest

+ References

No definition available.

+ Details

Name:	wex_BusinessAcquisitionPurchasePriceAllocationIncludingPortionAttributableToNoncontrollingInterest
Namespace Prefix:	wex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Business Acquisition, Purchase Price Allocation, Intangible Assets, Trade Names And Trademarks

+ References

No definition available.

+ Details

Name:	wex_BusinessAcquisitionPurchasePriceAllocationIntangibleAssetsTradeNamesAndTrademarks
Namespace Prefix:	wex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Business Acquisition, Purchase Price Allocation, Other Assets (Liabilities) Net

+ References

No definition available.

+ Details

Name:	wex_BusinessAcquisitionPurchasePriceAllocationOtherAssetsLiabilitiesNet
Namespace Prefix:	wex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Business Acquisition, Purchase Price Allocation, Redeemable Noncontrolling Interest

+ References

No definition available.

+ Details

Name:	wex_BusinessAcquisitionPurchasePriceAllocationRedeemableNoncontrollingInterest
Namespace Prefix:	wex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Business Acquisition, Purchase Price Allocation, Software

+ References

No definition available.

+ Details

Name:	wex_BusinessAcquisitionPurchasePriceAllocationSoftware
Namespace Prefix:	wex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill

+ References

No definition available.

+ Details

Name:	wex_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill
Namespace Prefix:	wex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant