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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES - Self-insured Insurance and Medical Claims (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Reinsurance Retention Policy [Line Items]
Employee-related liabilities	$ 2,600,000	$ 2,500,000
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%

X

- 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_
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Balance Type:	na
Period Type:	duration

X

- 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=120400017&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=120398452&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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

X

- 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:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: