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SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES, Impairment of Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
 [1]
Jun. 30, 2016
 [1]
Mar. 31, 2016
 [1]
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
 [1]
Mar. 31, 2015
 [1]
Dec. 31, 2014
Sep. 30, 2014
 [1]
Jun. 30, 2014
 [1]
Mar. 31, 2014
 [1]
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]                            
Impairment of goodwill $ 0 $ 0 $ 0 $ 0 $ 9,800 $ 58,900 [1] $ 0 $ 0 $ 117,600 $ 0 $ 0 $ 0   $ 67,663
Goodwill [Member]                            
Goodwill [Line Items]                            
Impairment of goodwill         $ 9,800 $ 57,800     $ 117,600       $ 0  
[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.