SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES, Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2016	Dec. 31, 2016
SUMMARY OF SIGNIFICANT ACCOUNTING AND BUSINESS POLICIES [Abstract]
Reduction of comprehensive income	$ (8.6)	$ (8.6)
Deferred tax asset on unrealized foreign currency losses	$ 8.6	$ 8.6

Refers to deferred tax asset on unrealized foreign currency losses not expected to be realized within one year.

No definition available.

Name:	dxpe_DeferredTaxAssetOnUnrealizedForeignCurrencyLosses
Namespace Prefix:	dxpe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration