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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES (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
Risks and Uncertainties [Abstract]              
Threshold percentage of sales (in hundredths)         10.00%dxpe_ThresholdPercentageOfSales    
Changes in allowance [Roll Forward]              
Balance at beginning of year       $ 8,798,000us-gaap_ValuationAllowancesAndReservesBalance $ 8,798,000us-gaap_ValuationAllowancesAndReservesBalance $ 7,204,000us-gaap_ValuationAllowancesAndReservesBalance $ 6,202,000us-gaap_ValuationAllowancesAndReservesBalance
Charged to cost and expenses         2,365,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 2,018,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 1,283,000us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Charged to other accounts         1,140,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts [1] 560,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts [1] 454,000us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts [1]
Deductions         (3,590,000)us-gaap_ValuationAllowancesAndReservesDeductions [2] (984,000)us-gaap_ValuationAllowancesAndReservesDeductions [2] (735,000)us-gaap_ValuationAllowancesAndReservesDeductions [2]
Balance at end of year 8,713,000us-gaap_ValuationAllowancesAndReservesBalance       8,713,000us-gaap_ValuationAllowancesAndReservesBalance 8,798,000us-gaap_ValuationAllowancesAndReservesBalance 7,204,000us-gaap_ValuationAllowancesAndReservesBalance
Impairment of Goodwill and Other Intangible Assets [Abstract]              
Impairment of goodwill 117,600,000us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss [3] 0us-gaap_GoodwillImpairmentLoss [3] 0us-gaap_GoodwillImpairmentLoss [3] 117,569,000us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Revenue Recognition [Abstract]              
Revenues recognized on contracts in process         65,900,000us-gaap_DeferredRevenueRevenueRecognized 12,700,000us-gaap_DeferredRevenueRevenueRecognized 15,900,000us-gaap_DeferredRevenueRevenueRecognized
Minimum contract period         1 year    
Maximum contract period         2 years    
Self-insured Insurance and Medical Claims [Abstract]              
Workers compensation insurance reserves, per claim 100,000dxpe_InsuranceReservesPerWorkersCompensationClaim       100,000dxpe_InsuranceReservesPerWorkersCompensationClaim    
Medical insurance reserves, per claim 250,000dxpe_InsuranceReservesPerMedicalInsuranceClaim       250,000dxpe_InsuranceReservesPerMedicalInsuranceClaim    
Accrual for claims 2,900,000us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent       2,900,000us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent 2,100,000us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent  
Debt Issuance Cost Amortization [Abstract]              
Total unamortized debt issuance costs $ 2,700,000us-gaap_UnamortizedDebtIssuanceExpense       $ 2,700,000us-gaap_UnamortizedDebtIssuanceExpense $ 2,400,000us-gaap_UnamortizedDebtIssuanceExpense  
Buildings [Member] | Minimum [Member]              
Property, Plant and Equipment [Line Items]              
Estimated useful life         20 years    
Buildings [Member] | Maximum [Member]              
Property, Plant and Equipment [Line Items]              
Estimated useful life         39 years    
Building Improvements [Member] | Minimum [Member]              
Property, Plant and Equipment [Line Items]              
Estimated useful life         10 years    
Building Improvements [Member] | Maximum [Member]              
Property, Plant and Equipment [Line Items]              
Estimated useful life         20 years    
Furniture, Fixtures and Equipment [Member] | Minimum [Member]              
Property, Plant and Equipment [Line Items]              
Estimated useful life         3 years    
Furniture, Fixtures and Equipment [Member] | Maximum [Member]              
Property, Plant and Equipment [Line Items]              
Estimated useful life         20 years    
Leasehold Improvements [Member]              
Property, Plant and Equipment [Line Items]              
Estimated useful life         Shorter of estimated useful life or related lease term    
[1] Includes allowance for doubtful accounts from acquisitions
[2] Uncollectible accounts written off, net of recoveries
[3] 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.