SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES, Self-insured Insurance and Medical Claims (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Reinsurance Retention Policy [Line Items]
Accrual for claims	$ 2,700,000	$ 3,100,000
Self-insured Insurance [Member] \| Maximum [Member]
Reinsurance Retention Policy [Line Items]
Amount retained, per claim	100,000
Medical Claims [Member] \| Maximum [Member]
Reinsurance Retention Policy [Line Items]
Amount retained, per claim	$ 175,000
Retention percentage of employee higher risk claims	0.05%

Refers to the retention percentage for employee where a higher risk claims per medical insurance claim.

No definition available.

Name:	dxpe_RetentionPercentageOfEmployeeHigherRiskClaims
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-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

Name:	us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Stated amount that is the upper retention limit per entity policy.

+ References

No definition available.

+ Details

Name:	us-gaap_ReinsuranceRetentionPolicyAmountRetained
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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_ReinsuranceRetentionPolicyLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ReinsurancePolicyTypeAxis=dxpe_SelfInsuredInsuranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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