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GOODWILL AND OTHER INTANGIBLE ASSETS, Goodwill balance by reportable segment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill	$ 253,312us-gaap_Goodwill	$ 188,110us-gaap_Goodwill	$ 145,788us-gaap_Goodwill
Service Centers [Member]
Goodwill [Line Items]
Goodwill	167,302us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember	142,714us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember
Innovative Pumping Solutions [Member]
Goodwill [Line Items]
Goodwill	68,872us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember	28,258us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember
Supply Chain Services [Member]
Goodwill [Line Items]
Goodwill	$ 17,138us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember	$ 17,138us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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

X

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dxpe_ServiceCentersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dxpe_SupplyChainServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: