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EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	$ 3.6us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 2.7us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount	$ 1.9us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

X

- 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

X

- 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

X

- 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