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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (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, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                          
Impairment expense $ 0 $ 0 $ 0 $ 0 $ 9,800 $ 58,900 [1] $ 0 $ 0 $ 117,600 $ 0 $ 0 $ 0 $ 67,663
Level 3 [Member]                          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                          
Impairment expense         $ 9,800 $ 57,800     $ 117,600        
Level 3 [Member] | Minimum [Member]                          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                          
Estimated future cash flows, discount rate 10.00%         10.00%     10.00%        
Level 3 [Member] | Maximum [Member]                          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                          
Estimated future cash flows, discount rate 11.50%         11.50%     13.50%        
[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.