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GOODWILL AND OTHER INTANGIBLE ASSETS, Goodwill balance by reportable segment (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Goodwill $ 253,312us-gaap_Goodwill $ 253,312us-gaap_Goodwill
Service Centers [Member]    
Goodwill [Line Items]    
Goodwill 167,302us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dxpe_ServiceCentersMember		 167,302us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dxpe_ServiceCentersMember
Innovative Pumping Solutions [Member]    
Goodwill [Line Items]    
Goodwill 68,872us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dxpe_InnovativePumpingSolutionsMember		 68,872us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dxpe_InnovativePumpingSolutionsMember
Supply Chain Services [Member]    
Goodwill [Line Items]    
Goodwill $ 17,138us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dxpe_SupplyChainServicesMember		 $ 17,138us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= dxpe_SupplyChainServicesMember