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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES (Details) (USD $) | 3 Months Ended | 12 Months Ended
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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 |  |  |  |  |  | $ 8,798,000 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 8,798,000 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 7,204,000 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 6,202,000 us-gaap_ValuationAllowancesAndReservesBalance |
Charged to cost and expenses |  |  |  |  |  |  |  | 2,365,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 2,018,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 1,283,000 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |
Charged to other accounts |  |  |  |  |  |  |  | 1,140,000 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | [1] | 560,000 us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts | [1] | 454,000 us-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 | 8,713,000 us-gaap_ValuationAllowancesAndReservesBalance |  |  |  |  |  |  | 8,713,000 us-gaap_ValuationAllowancesAndReservesBalance |  | 8,798,000 us-gaap_ValuationAllowancesAndReservesBalance |  | 7,204,000 us-gaap_ValuationAllowancesAndReservesBalance |
Impairment of Goodwill and Other Intangible Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill | 117,600,000 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | [3] | 0 us-gaap_GoodwillImpairmentLoss | [3] | 0 us-gaap_GoodwillImpairmentLoss | [3] | 117,569,000 us-gaap_GoodwillImpairmentLoss |  | 0 us-gaap_GoodwillImpairmentLoss |  | 0 us-gaap_GoodwillImpairmentLoss |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues recognized on contracts in process |  |  |  |  |  |  |  | 65,900,000 us-gaap_DeferredRevenueRevenueRecognized |  | 12,700,000 us-gaap_DeferredRevenueRevenueRecognized |  | 15,900,000 us-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 | 100,000 dxpe_InsuranceReservesPerWorkersCompensationClaim |  |  |  |  |  |  | 100,000 dxpe_InsuranceReservesPerWorkersCompensationClaim |  |  |  |  |
Medical insurance reserves, per claim | 250,000 dxpe_InsuranceReservesPerMedicalInsuranceClaim |  |  |  |  |  |  | 250,000 dxpe_InsuranceReservesPerMedicalInsuranceClaim |  |  |  |  |
Accrual for claims | 2,900,000 us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent |  |  |  |  |  |  | 2,900,000 us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent |  | 2,100,000 us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent |  |  |
Debt Issuance Cost Amortization [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total unamortized debt issuance costs | $ 2,700,000 us-gaap_UnamortizedDebtIssuanceExpense |  |  |  |  |  |  | $ 2,700,000 us-gaap_UnamortizedDebtIssuanceExpense |  | $ 2,400,000 us-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.

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- Definition Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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