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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
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Goodwill [Line Items] |  |  |
Goodwill | $ 253,312 us-gaap_Goodwill | $ 188,110 us-gaap_Goodwill | $ 145,788 us-gaap_Goodwill
Service Centers [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 167,302 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember | 142,714 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |
Innovative Pumping Solutions [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 68,872 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember | 28,258 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |
Supply Chain Services [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 17,138 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember | $ 17,138 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember |

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- 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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