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SEGMENT REPORTING - Identifiable Assets by Segments (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total Identifiable Assets | $ 744,678 | $ 645,226
Corporate |  |
Segment Reporting Information [Line Items] |  |
Total Identifiable Assets | 46,900 | 54,700
Service Centers |  |
Segment Reporting Information [Line Items] |  |
Total Identifiable Assets | 458,975 | 402,944
Innovative Pumping Solutions |  |
Segment Reporting Information [Line Items] |  |
Total Identifiable Assets | 225,361 | 188,765
Supply Chain Services |  |
Segment Reporting Information [Line Items] |  |
Total Identifiable Assets | $ 60,342 | $ 53,517

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- Definition Identifiable Assets + References No definition available. + Details
Name: | dxpe_IdentifiableAssets
Namespace Prefix: | dxpe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=dxpe_InnovativePumpingSolutionsMember
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: |