SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Variable Interest Entity [Line Items]
Ownership percentage in VIE					47.50%
Assets of VIE	$ 5,400	$ 5,200			$ 5,400		$ 5,200
Increase cost of sales from consolidation of the VIE	300		$ 200		700	$ 800
Increase in selling, general and administrative expense	300		58		800	200
Income tax benefit of VIE	33		50		219	130
Equity method investment		0	$ 0	$ 4,000	0	$ 3,214
Distributions received from investments							4,000
Receivable related to return from equity method investment	200				$ 200
Former Executive Officers and Other Employees of DXP [Member]
Variable Interest Entity [Line Items]
Ownership percentage in VIE					52.50%
Property and Equipment [Member]
Variable Interest Entity [Line Items]
Assets of VIE	$ 4,900	$ 5,200			$ 4,900		$ 5,200