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OTHER COMPREHENSIVE INCOME (Details) (USD $) | 12 Months Ended
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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 | $ 400,000 dxpe_OtherComprehensiveIncomeLossUnrealizedHoldingGainLossOnInvestmentArisingDuringPeriodBeforeTax
Number of companies acquired | 4 dxpe_NumberOfEntitiesAcquiredWhichOperateInCanada |  |
Cumulative translation adjustment | $ (3,277,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | $ (3,040,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | $ 617,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax

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- 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 + Details
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