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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2014 Segment | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 02, 2014 | Apr. 16, 2013
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of reporting units |  |  |  |  |  |  |  | 4 us-gaap_NumberOfReportingUnits |  |  |  |
Impairment of goodwill | $ 117,600,000 us-gaap_GoodwillImpairmentLoss | $ 0 us-gaap_GoodwillImpairmentLoss | [1] | $ 0 us-gaap_GoodwillImpairmentLoss | [1] | $ 0 us-gaap_GoodwillImpairmentLoss | [1] | $ 117,569,000 us-gaap_GoodwillImpairmentLoss | $ 0 us-gaap_GoodwillImpairmentLoss | $ 0 us-gaap_GoodwillImpairmentLoss |  |
Goodwill carrying amount | 253,312,000 us-gaap_Goodwill |  |  |  |  |  |  | 253,312,000 us-gaap_Goodwill | 188,110,000 us-gaap_Goodwill | 145,788,000 us-gaap_Goodwill |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  | 188,110,000 us-gaap_Goodwill |  | 188,110,000 us-gaap_Goodwill | 145,788,000 us-gaap_Goodwill |  |  |
Acquired during the year |  |  |  |  |  |  |  | 182,771,000 us-gaap_GoodwillAcquiredDuringPeriod | 39,898,000 us-gaap_GoodwillAcquiredDuringPeriod |  |  |
Adjustments to prior year estimates |  |  |  |  |  |  |  |  | 2,424,000 us-gaap_GoodwillPurchaseAccountingAdjustments |  |  |
Impairment | (117,600,000)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | [1] | 0 us-gaap_GoodwillImpairmentLoss | [1] | 0 us-gaap_GoodwillImpairmentLoss | [1] | (117,569,000)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |  |
Translation adjustment |  |  |  |  |  |  |  | 0 us-gaap_GoodwillTranslationAdjustments | 0 us-gaap_GoodwillTranslationAdjustments |  |  |
Ending balance | 253,312,000 us-gaap_Goodwill |  |  |  |  |  |  | 253,312,000 us-gaap_Goodwill | 188,110,000 us-gaap_Goodwill | 145,788,000 us-gaap_Goodwill |  |
Other Intangibles Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  |  |  | 69,722,000 us-gaap_OtherIntangibleAssetsNet |  | 69,722,000 us-gaap_OtherIntangibleAssetsNet | 63,189,000 us-gaap_OtherIntangibleAssetsNet |  |  |
Acquired during the year |  |  |  |  |  |  |  | 85,264,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 | 22,033,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 |  |  |
Adjustments to prior year estimates |  |  |  |  |  |  |  |  | (2,424,000)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments |  |  |
Impairment |  |  |  |  |  |  |  | 0 us-gaap_ImpairmentOfIntangibleAssetsFinitelived |  |  |  |
Translation adjustment |  |  |  |  |  |  |  | (2,173,000)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments | (1,246,000)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments |  |  |
Amortization |  |  |  |  |  |  |  | (22,480,000)us-gaap_AmortizationOfIntangibleAssets | (11,830,000)us-gaap_AmortizationOfIntangibleAssets | (10,886,000)us-gaap_AmortizationOfIntangibleAssets |  |
Balance at end of period | 130,333,000 us-gaap_OtherIntangibleAssetsNet |  |  |  |  |  |  | 130,333,000 us-gaap_OtherIntangibleAssetsNet | 69,722,000 us-gaap_OtherIntangibleAssetsNet | 63,189,000 us-gaap_OtherIntangibleAssetsNet |  |
Total Goodwill and Intangible Assets [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  | 257,832,000 us-gaap_IntangibleAssetsNetIncludingGoodwill |  | 257,832,000 us-gaap_IntangibleAssetsNetIncludingGoodwill | 208,977,000 us-gaap_IntangibleAssetsNetIncludingGoodwill |  |  |
Acquired during the year |  |  |  |  |  |  |  | 268,035,000 dxpe_TotalIntangibleAssetsIncludingGoodwillAcquiredDuringYear | 61,931,000 dxpe_TotalIntangibleAssetsIncludingGoodwillAcquiredDuringYear |  |  |
Adjustment to prior year estimates |  |  |  |  |  |  |  |  | 0 dxpe_TotalIntangibleAssetsAdjustmentToPriorYearEstimates |  |  |
Impairment |  |  |  |  |  |  |  | (117,569,000)us-gaap_AssetImpairmentCharges |  |  |  |
Translation adjustment |  |  |  |  |  |  |  | (2,173,000)dxpe_TotalIntangibleAssetsTranslationAdjustmentToPriorYearEstimates | (1,246,000)dxpe_TotalIntangibleAssetsTranslationAdjustmentToPriorYearEstimates |  |  |
Amortization |  |  |  |  |  |  |  | (22,480,000)us-gaap_AmortizationOfIntangibleAssets | (11,830,000)us-gaap_AmortizationOfIntangibleAssets | (10,886,000)us-gaap_AmortizationOfIntangibleAssets |  |
Ending Balance | 383,645,000 us-gaap_IntangibleAssetsNetIncludingGoodwill |  |  |  |  |  |  | 383,645,000 us-gaap_IntangibleAssetsNetIncludingGoodwill | 257,832,000 us-gaap_IntangibleAssetsNetIncludingGoodwill | 208,977,000 us-gaap_IntangibleAssetsNetIncludingGoodwill |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount | 196,745,000 us-gaap_FiniteLivedIntangibleAssetsGross |  |  |  |  |  |  | 196,745,000 us-gaap_FiniteLivedIntangibleAssetsGross | 114,132,000 us-gaap_FiniteLivedIntangibleAssetsGross |  |  |
Accumulated amortization | (66,412,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |  |  |  |  |  | (66,412,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (44,410,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |  |
Carrying amount, net | 130,333,000 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |  |  |  |  | 130,333,000 us-gaap_FiniteLivedIntangibleAssetsNet | 69,722,000 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |
Amortization expense |  |  |  |  |  |  |  | 22,480,000 us-gaap_AmortizationOfIntangibleAssets | 11,830,000 us-gaap_AmortizationOfIntangibleAssets | 10,886,000 us-gaap_AmortizationOfIntangibleAssets |  |
The estimated future annual amortization of intangible assets for each of the next five years and thereafter [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
2015 | 20,584,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |  |  |  | 20,584,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |
2016 | 17,584,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |  |  |  | 17,584,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |
2017 | 16,737,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |  |  |  | 16,737,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |
2018 | 15,163,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |  |  |  | 15,163,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |
2019 | 13,828,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |  |  |  | 13,828,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |
Thereafter | 46,437,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |  |  |  |  |  | 46,437,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |  |  |
Vendor Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount | 2,496,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |  |  |  |  |  |  | 2,496,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember | 2,496,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |  |  |
Accumulated amortization | (1,330,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |  |  |  |  |  |  | (1,330,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember | (1,205,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |  |  |
Carrying amount, net | 1,166,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |  |  |  |  |  |  | 1,166,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember | 1,291,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember |  |  |
Weighted average remaining estimated life |  |  |  |  |  |  |  | 9 years 3 months 18 days |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount | 192,512,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |  |  |  | 192,512,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 109,897,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Accumulated amortization | (63,957,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |  |  |  | (63,957,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (42,468,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Carrying amount, net | 128,555,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |  |  |  |  | 128,555,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 67,429,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Weighted average remaining estimated life |  |  |  |  |  |  |  | 10 years 9 months 18 days |  |  |  |
Non-Compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount | 1,737,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |  |  |  |  | 1,737,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 1,739,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |
Accumulated amortization | (1,125,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |  |  |  |  | (1,125,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | (737,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |
Carrying amount, net | 612,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |  |  |  |  | 612,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember | 1,002,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember |  |  |
Weighted average remaining estimated life |  |  |  |  |  |  |  | 2 years 7 months 6 days |  |  |  |
B27, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  | 259,400,000 dxpe_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsAndGoodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Goodwill carrying amount |  |  |  |  |  |  |  |  |  |  | 178,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  | 178,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
Ending balance |  |  |  |  |  |  |  |  |  |  | 178,300,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember |
NatPro [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and other intangibles |  |  |  |  |  |  |  |  |  |  |  | 37,600,000 dxpe_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsAndGoodwill / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember
Goodwill carrying amount |  |  |  |  |  |  |  |  |  |  |  | 24,600,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  | 24,600,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember
Ending balance |  |  |  |  |  |  |  |  |  |  |  | 24,600,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember
Service Centers [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill carrying amount | 167,302,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |  |  |  |  | 167,302,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember | 142,714,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | 167,302,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |  |  |  |  | 167,302,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember | 142,714,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |
Service Centers [Member] | B27, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill | 10,200,000 us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |  |  |  |  |  |  |  |  |
Fair value of goodwill | 20,100,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |  |  |  |  | 20,100,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |  |
Percentage of goodwill not deductible for tax purpose | 60.00%dxpe_PercentageOfGoodwillNotDeductibleForTaxPurpose / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |  |  |  |  |  |  |  |  |
Percentage Goodwill impairment | 40.00%dxpe_PercentageGoodwillImpairment / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Impairment | (10,200,000)us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember |  |  |  |  |  |  |  |  |  |  |
Innovative Pumping Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill carrying amount | 68,872,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  | 68,872,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember | 28,258,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | 68,872,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  | 68,872,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember | 28,258,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |
Innovative Pumping Solutions [Member] | B27, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill | 95,100,000 us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  |  |  |  |  |
Goodwill carrying amount | 148,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  | 148,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |
Fair value of goodwill | 52,900,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  | 52,900,000 us-gaap_GoodwillFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |
Percentage of goodwill not deductible for tax purpose | 60.00%dxpe_PercentageOfGoodwillNotDeductibleForTaxPurpose / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  |  |  |  |  |
Percentage Goodwill impairment | 40.00%dxpe_PercentageGoodwillImpairment / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Impairment | (95,100,000)us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  |  |  |  |  |
Ending balance | 148,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  | 148,000,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |
Innovative Pumping Solutions [Member] | NatPro [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of goodwill | 12,300,000 us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Impairment | (12,300,000)us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember |  |  |  |  |  |  |  |  |  |  |
Supply Chain Services [Member] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill carrying amount | 17,138,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember |  |  |  |  |  |  | 17,138,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember | 17,138,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Ending balance | $ 17,138,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember |  |  |  |  |  |  | $ 17,138,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember | $ 17,138,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember |  |  |
[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.

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