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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								4us-gaap_NumberOfReportingUnits
Impairment of goodwill	$ 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
Goodwill carrying amount	253,312,000us-gaap_Goodwill							253,312,000us-gaap_Goodwill	188,110,000us-gaap_Goodwill	145,788,000us-gaap_Goodwill
Goodwill [Roll Forward]
Beginning balance						188,110,000us-gaap_Goodwill		188,110,000us-gaap_Goodwill	145,788,000us-gaap_Goodwill
Acquired during the year								182,771,000us-gaap_GoodwillAcquiredDuringPeriod	39,898,000us-gaap_GoodwillAcquiredDuringPeriod
Adjustments to prior year estimates									2,424,000us-gaap_GoodwillPurchaseAccountingAdjustments
Impairment	(117,600,000)us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	[1]	0us-gaap_GoodwillImpairmentLoss	[1]	0us-gaap_GoodwillImpairmentLoss	[1]	(117,569,000)us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Translation adjustment								0us-gaap_GoodwillTranslationAdjustments	0us-gaap_GoodwillTranslationAdjustments
Ending balance	253,312,000us-gaap_Goodwill							253,312,000us-gaap_Goodwill	188,110,000us-gaap_Goodwill	145,788,000us-gaap_Goodwill
Other Intangibles Assets [Roll Forward]
Balance at beginning of period						69,722,000us-gaap_OtherIntangibleAssetsNet		69,722,000us-gaap_OtherIntangibleAssetsNet	63,189,000us-gaap_OtherIntangibleAssetsNet
Acquired during the year								85,264,000us-gaap_FinitelivedIntangibleAssetsAcquired1	22,033,000us-gaap_FinitelivedIntangibleAssetsAcquired1
Adjustments to prior year estimates									(2,424,000)us-gaap_FiniteLivedIntangibleAssetsTranslationAndPurchaseAccountingAdjustments
Impairment								0us-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	130,333,000us-gaap_OtherIntangibleAssetsNet							130,333,000us-gaap_OtherIntangibleAssetsNet	69,722,000us-gaap_OtherIntangibleAssetsNet	63,189,000us-gaap_OtherIntangibleAssetsNet
Total Goodwill and Intangible Assets [Roll Forward]
Beginning Balance						257,832,000us-gaap_IntangibleAssetsNetIncludingGoodwill		257,832,000us-gaap_IntangibleAssetsNetIncludingGoodwill	208,977,000us-gaap_IntangibleAssetsNetIncludingGoodwill
Acquired during the year								268,035,000dxpe_TotalIntangibleAssetsIncludingGoodwillAcquiredDuringYear	61,931,000dxpe_TotalIntangibleAssetsIncludingGoodwillAcquiredDuringYear
Adjustment to prior year estimates									0dxpe_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	383,645,000us-gaap_IntangibleAssetsNetIncludingGoodwill							383,645,000us-gaap_IntangibleAssetsNetIncludingGoodwill	257,832,000us-gaap_IntangibleAssetsNetIncludingGoodwill	208,977,000us-gaap_IntangibleAssetsNetIncludingGoodwill
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	196,745,000us-gaap_FiniteLivedIntangibleAssetsGross							196,745,000us-gaap_FiniteLivedIntangibleAssetsGross	114,132,000us-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	130,333,000us-gaap_FiniteLivedIntangibleAssetsNet							130,333,000us-gaap_FiniteLivedIntangibleAssetsNet	69,722,000us-gaap_FiniteLivedIntangibleAssetsNet
Amortization expense								22,480,000us-gaap_AmortizationOfIntangibleAssets	11,830,000us-gaap_AmortizationOfIntangibleAssets	10,886,000us-gaap_AmortizationOfIntangibleAssets
The estimated future annual amortization of intangible assets for each of the next five years and thereafter [Abstract]
2015	20,584,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths							20,584,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
2016	17,584,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo							17,584,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
2017	16,737,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree							16,737,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
2018	15,163,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour							15,163,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
2019	13,828,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive							13,828,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Thereafter	46,437,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive							46,437,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
Vendor Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,496,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember							2,496,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember	2,496,000us-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	1,166,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember							1,166,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerContractsMember	1,291,000us-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	192,512,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember							192,512,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	109,897,000us-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	128,555,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember							128,555,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	67,429,000us-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	1,737,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember							1,737,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	1,739,000us-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	612,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember							612,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	1,002,000us-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											259,400,000dxpe_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsAndGoodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember
Goodwill carrying amount											178,300,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember
Goodwill [Roll Forward]
Beginning balance											178,300,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember
Ending balance											178,300,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember
NatPro [Member]
Goodwill and Intangible Asset Impairment [Abstract]
Goodwill and other intangibles												37,600,000dxpe_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsAndGoodwill / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember
Goodwill carrying amount												24,600,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember
Goodwill [Roll Forward]
Beginning balance												24,600,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember
Ending balance												24,600,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_NationalProcessEquipmentIncMember
Service Centers [Member]
Goodwill and Intangible Asset Impairment [Abstract]
Goodwill carrying amount	167,302,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember							167,302,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember	142,714,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember
Goodwill [Roll Forward]
Ending balance	167,302,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember							167,302,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember	142,714,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember
Service Centers [Member] | B27, LLC [Member]
Goodwill and Intangible Asset Impairment [Abstract]
Impairment of goodwill	10,200,000us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember
Fair value of goodwill	20,100,000us-gaap_GoodwillFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_ServiceCentersMember							20,100,000us-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	68,872,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember							68,872,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember	28,258,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember
Goodwill [Roll Forward]
Ending balance	68,872,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember							68,872,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember	28,258,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember
Innovative Pumping Solutions [Member] | B27, LLC [Member]
Goodwill and Intangible Asset Impairment [Abstract]
Impairment of goodwill	95,100,000us-gaap_GoodwillImpairmentLoss / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember
Goodwill carrying amount	148,000,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember							148,000,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember
Fair value of goodwill	52,900,000us-gaap_GoodwillFairValueDisclosure / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember							52,900,000us-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	148,000,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dxpe_B27LlcMember / us-gaap_StatementBusinessSegmentsAxis = dxpe_InnovativePumpingSolutionsMember							148,000,000us-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	12,300,000us-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	17,138,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember							17,138,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember	17,138,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember
Goodwill [Roll Forward]
Ending balance	$ 17,138,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember							$ 17,138,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = dxpe_SupplyChainServicesMember	$ 17,138,000us-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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