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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Proceeds on sale of investment         $ (1,688,000)us-gaap_PaymentsForProceedsFromInvestments $ 68,000us-gaap_PaymentsForProceedsFromInvestments $ 105,000us-gaap_PaymentsForProceedsFromInvestments
Loss on sale of investments         100,000us-gaap_LossOnSaleOfInvestments    
Impairment expense 117,600,000us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss [1] 0us-gaap_GoodwillImpairmentLoss [1] 0us-gaap_GoodwillImpairmentLoss [1] 117,569,000us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Maximum [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Estimated future cash flows, discount rate (in hundredths) 13.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
      15.90%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Minimum [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Estimated future cash flows, discount rate (in hundredths) 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
      13.50%us-gaap_FairValueInputsDiscountRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Level 1 [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Fair value at beginning of period       1,837,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
1,837,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
2,413,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Investment during period         0dxpe_InvestmentsMadeDuringPeriodAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
68,000dxpe_InvestmentsMadeDuringPeriodAtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Realized and unrealized gains (losses) included in other comprehensive income         (149,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
(644,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Proceeds on sale of investment         (1,688,000)us-gaap_PaymentsForProceedsFromInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Fair value at end of period 0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
      0us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
1,837,000us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
 
Payment for investment         $ 1,700,000us-gaap_PaymentsForProceedsFromLongtermInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
[1] During the fourth quarter of 2014, DXP finalized its purchase accounting for customer relationships for the acquisition of B27 and amortized the customer relationships on an accelerated basis. The revision increased amortization expense by $1.0 million per quarter.