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OTHER COMPREHENSIVE INCOME (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 Company	Dec. 31, 2013	Dec. 31, 2012
OTHER COMPREHENSIVE INCOME [Abstract]
Other comprehensive income related to investment valuation	$ (100,000)dxpe_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnInvestmentArisingDuringPeriodBeforeTax	$ (600,000)dxpe_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnInvestmentArisingDuringPeriodBeforeTax	$ 400,000dxpe_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnInvestmentArisingDuringPeriodBeforeTax
Number of companies acquired	4dxpe_NumberOfEntitiesAcquiredWhichOperateInCanada
Cumulative translation adjustment	$ (3,277,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	$ (3,040,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	$ 617,000us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

X

- Definition

Refers to acquired companies that operate in Canada.

+ References

No definition available.

+ Details

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- Definition

Before tax and reclassification adjustments amount of unrealized holding gain (loss) and transfers on an investment.

+ References

No definition available.

+ Details

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- Definition

Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b,c)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

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