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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
EMPLOYEE BENEFIT PLANS [Abstract]
Rate of company matching	50.00%		50.00%	50.00%
Percentage of deferred salary which is matched	4.00%		4.00%	4.00%
Company contribution to the 401(K) plan	$ 0.4	$ 0.4	$ 2.6	$ 2.5

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

- References

No definition available.

+ 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