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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES - Self-insured Insurance and Medical Claims (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reinsurance Retention Policy [Line Items] |  |
Employee-related liabilities | $ 2,300,000 | $ 2,700,000
Self-insured Insurance | Maximum |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | 100,000 |
Medical Claims | Maximum |  |
Reinsurance Retention Policy [Line Items] |  |
Reinsurance retention policy, amount retained | $ 175,000 |
Retention percentage of employee higher risk claims | 0.05% |

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- Definition Refers to the retention percentage for employee where a higher risk claims per medical insurance claim. + References No definition available. + Details
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Namespace Prefix: | dxpe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Stated amount that is the upper retention limit per entity policy. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
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Data Type: | xbrli:stringItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ReinsurancePolicyTypeAxis=dxpe_MedicalClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |