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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Ownership percentage in VIE	47.50%
Assets of VIE	$ 4.4
Increase cost of sales from consolidation of the VIE	0.7	$ 0.7
Cash [Member]
Variable Interest Entity [Line Items]
Assets of VIE	1.4
Fixed Assets [Member]
Variable Interest Entity [Line Items]
Assets of VIE	$ 2.9

X

- Definition

The increase (decrease) cost of sales recognized from consolidation of variable interest entity (VIE).

+ References

No definition available.

+ Details

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Namespace Prefix:	dxpe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (bb)



-URI http://asc.fasb.org/extlink&oid=52262685&loc=d3e5710-111685

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

X

- Definition

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 50



-Paragraph 5A



-Subparagraph (d)



-URI http://asc.fasb.org/extlink&oid=52262685&loc=SL6759159-111685

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=dxpe_FixedAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: