    <SEC-DOCUMENT>0001157523-20-001596-index.html : 20201215
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    <ACCEPTANCE-DATETIME>20201215064007
    ACCESSION NUMBER:		0001157523-20-001596
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		33
    CONFORMED PERIOD OF REPORT:	20201215
    ITEM INFORMATION:		Entry into a Material Definitive Agreement
    ITEM INFORMATION:		Completion of Acquisition or Disposition of Assets
    ITEM INFORMATION:		Regulation FD Disclosure
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20201215
    DATE AS OF CHANGE:		20201215

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			WEX Inc.
    		CENTRAL INDEX KEY:			0001309108
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
    		IRS NUMBER:				010526993
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-32426
    		FILM NUMBER:		201388166

    	BUSINESS ADDRESS:
    		STREET 1:		97 DARLING AVENUE
    		CITY:			SOUTH PORTLAND
    		STATE:			ME
    		ZIP:			04106
    		BUSINESS PHONE:		(207) 773-8171

    	MAIL ADDRESS:
    		STREET 1:		97 DARLING AVENUE
    		CITY:			SOUTH PORTLAND
    		STATE:			ME
    		ZIP:			04106

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Wright Express CORP
    		DATE OF NAME CHANGE:	20041118
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>a52347541.htm
    <DESCRIPTION>WEX INC. 8-K
    <TEXT>
    Document 1 - file: a52347541.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-10.1
    <SEQUENCE>2
    <FILENAME>a52347541ex10_1.htm
    <DESCRIPTION>EXHIBIT 10.1
    <TEXT>
    Document 2 - file: a52347541ex10_1.htm

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    <TYPE>EX-99.1
    <SEQUENCE>3
    <FILENAME>a52347541ex99_1.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 3 - file: a52347541ex99_1.htm

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    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>4
    <FILENAME>wex-20201215.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
    <TEXT>
    Document 4 - file: wex-20201215.xsd

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    <DOCUMENT>
    <TYPE>EX-101.LAB
    <SEQUENCE>5
    <FILENAME>wex-20201215_lab.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
    <TEXT>
    Document 5 - file: wex-20201215_lab.xml

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    <DOCUMENT>
    <TYPE>EX-101.PRE
    <SEQUENCE>6
    <FILENAME>wex-20201215_pre.xml
    <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
    <TEXT>
    Document 6 - file: wex-20201215_pre.xml

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    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>sig1.jpg
    <TEXT>
    Document 7 - file: sig1.jpg

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    <SEQUENCE>8
    <FILENAME>sig2.jpg
    <TEXT>
    Document 8 - file: sig2.jpg

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    <SEQUENCE>9
    <FILENAME>sig3.jpg
    <TEXT>
    Document 9 - file: sig3.jpg

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    <SEQUENCE>10
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    <TEXT>
    Document 10 - file: sig4.jpg

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    Document 11 - file: sig5.jpg

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    <TEXT>
    Document 12 - file: sig6.jpg

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    <SEQUENCE>13
    <FILENAME>sig7.jpg
    <TEXT>
    Document 13 - file: sig7.jpg

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    <SEQUENCE>14
    <FILENAME>sig8.jpg
    <TEXT>
    Document 14 - file: sig8.jpg

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    <FILENAME>sig9.jpg
    <TEXT>
    Document 15 - file: sig9.jpg

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    Document 16 - file: sig10.jpg

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    Document 17 - file: sig11.jpg

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    <SEQUENCE>18
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    Document 18 - file: sig12.jpg

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    Document 19 - file: sig13.jpg

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    Document 20 - file: sig14.jpg

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    Document 21 - file: sig15.jpg

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    <SEQUENCE>22
    <FILENAME>sig16.jpg
    <TEXT>
    Document 22 - file: sig16.jpg

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    Document 23 - file: sig17.jpg

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    <SEQUENCE>24
    <FILENAME>sig18.jpg
    <TEXT>
    Document 24 - file: sig18.jpg

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    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>25
    <FILENAME>wex_logo.jpg
    <TEXT>
    Document 25 - file: wex_logo.jpg

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>26
    <FILENAME>a52347541_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 26 - file: a52347541_htm.html

    Document 26 - RAW XML: a52347541_htm.xml

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    <SEQUENCE>27
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    <TEXT>
    Document 27 - file: R1.htm

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    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>28
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    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 28 - file: Financial_Report.xlsx

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    <SEQUENCE>29
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    <TEXT>
    Document 29 - file: Show.js

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    <TYPE>XML
    <SEQUENCE>30
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    <TEXT>
    Document 30 - file: report.css

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    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>31
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    <TEXT>
    Document 31 - file: FilingSummary.html

    Document 31 - RAW XML: FilingSummary.xml

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    <TYPE>JSON
    <SEQUENCE>33
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    <TEXT>
    Document 33 - file: MetaLinks.json

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    <SEQUENCE>34
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