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EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
EMPLOYEE BENEFIT PLANS [Abstract] |  |  |
Rate of company matching (in hundredths) | 50.00%dxpe_DefinedContributionPlanMaximumAnnualMatchingContributionPerEmployeePercent | 50.00%dxpe_DefinedContributionPlanMaximumAnnualMatchingContributionPerEmployeePercent | 50.00%dxpe_DefinedContributionPlanMaximumAnnualMatchingContributionPerEmployeePercent
Percentage of deferred salary which is matched (in hundredths) | 4.00%dxpe_DefinedContributionPlanEmployerContributionMatchingPercent | 4.00%dxpe_DefinedContributionPlanEmployerContributionMatchingPercent | 4.00%dxpe_DefinedContributionPlanEmployerContributionMatchingPercent
Company contribution to the 401(K) plan | $ 3.6 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 2.7 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 1.9 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

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- Definition Maximum percentage of employees' contribution that the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | dxpe_DefinedContributionPlanEmployerContributionMatchingPercent
Namespace Prefix: | dxpe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee contribution, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | dxpe_DefinedContributionPlanMaximumAnnualMatchingContributionPerEmployeePercent
Namespace Prefix: | dxpe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration