Refers to consolidated leverage ratio period one.

No definition available.

Name:	dxpe_ConsolidatedLeverageRatioCovenantPeriodOne
Namespace Prefix:	dxpe_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Refers to consolidated leverage ratio period two.

+ References

No definition available.

+ Details

Name:	dxpe_ConsolidatedLeverageRatioCovenantPeriodTwo
Namespace Prefix:	dxpe_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument amortized discount percentage.

+ References

No definition available.

+ Details

Name:	dxpe_DebtInstrumentAmortizedDiscountPercentage
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the secured leverage ratio required to be maintained under financial covenants.

+ References

No definition available.

+ Details

Name:	dxpe_DebtInstrumentCovenantSecuredLeverageRatio
Namespace Prefix:	dxpe_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

A ratio that indicates a firm's ability to satisfy fixed financing expenses, such as interest and leases.

+ References

No definition available.

+ Details

Name:	dxpe_FixedChargeCoverageRatio
Namespace Prefix:	dxpe_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Incremental increase under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	dxpe_IncrementalIncreaseInTermLoan
Namespace Prefix:	dxpe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Refers to percentage of excess cash flow of debt instrument.

+ References

No definition available.

+ Details

Name:	dxpe_PercentageOfExcessCashFlow
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to percentage of reduction in excess cash flow of debt instrument if total leverage ratio is no more than 3.00 to 1.00.

+ References

No definition available.

+ Details

Name:	dxpe_ReductionInPercentageOfExcessCashFlowConditionOne
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to percentage of reduction in excess cash flow of debt instrument if total leverage ratio is no more than 2.50 to 1.00.

+ References

No definition available.

+ Details

Name:	dxpe_ReductionInPercentageOfExcessCashFlowConditionTwo
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the secured debt covenant amount net of restricted cash for secured leverage ratio.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredDebtCovenantAmountNetOfRestrictedCash
Namespace Prefix:	dxpe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatio
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioAbstract
Namespace Prefix:	dxpe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period eight.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodEight
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period five.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodFive
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period four.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodFour
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period nine.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodNine
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period one.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodOne
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period seven.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodSeven
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period six.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodSix
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period ten.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodTen
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period ten and thereafter.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodTenAndThereafter
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period three.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodThree
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Secured leverage ratio, defined as the ratio, as of the last day of any fiscal quarter of consolidated secured debt as of such day to EBITDA for period two.

+ References

No definition available.

+ Details

Name:	dxpe_SecuredLeverageRatioPeriodTwo
Namespace Prefix:	dxpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount (premium).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28567-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=dxpe_ABLRevolverMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=dxpe_CanadianInterbankOfferedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=dxpe_TermLoanBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=dxpe_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LONG-TERM DEBT (Details) $ in Thousands		9 Months Ended
LONG-TERM DEBT (Details) $ in Thousands	Aug. 29, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Borrowings [Abstract]
Long-term debt		$ 242,407	$ 224,685
Less unamortized debt issuance costs		(10,531)	(992)
Less: Current portion		(3,365)	(51,354)
Long-term debt less current maturities		239,042	173,331
ABL Revolver [Member]
Borrowings [Abstract]
Long-term debt		$ 0	0
Secured Leverage Ratio [Abstract]
Debt instrument term		5 years
Debt instrument face amount	$ 85,000
Maturity date		Aug. 29, 2022
Incremental increase in term loan	50,000
ABL Revolver [Member] \| Minimum [Member]
Secured Leverage Ratio [Abstract]
Incremental increase in term loan	$ 10,000
Commitment fee	0.25%
ABL Revolver [Member] \| Maximum [Member]
Secured Leverage Ratio [Abstract]
Commitment fee	0.375%
ABL Revolver [Member] \| LIBOR [Member] \| Minimum [Member]
Secured Leverage Ratio [Abstract]
Basis spread on base rate	1.25%
ABL Revolver [Member] \| LIBOR [Member] \| Maximum [Member]
Secured Leverage Ratio [Abstract]
Basis spread on base rate	1.75%
ABL Revolver [Member] \| CDOR [Member] \| Minimum [Member]
Secured Leverage Ratio [Abstract]
Basis spread on base rate	1.25%
ABL Revolver [Member] \| CDOR [Member] \| Maximum [Member]
Secured Leverage Ratio [Abstract]
Basis spread on base rate	1.75%
ABL Revolver [Member] \| Prime Rate [Member] \| Minimum [Member]
Secured Leverage Ratio [Abstract]
Basis spread on base rate	0.25%
ABL Revolver [Member] \| Prime Rate [Member] \| Maximum [Member]
Secured Leverage Ratio [Abstract]
Basis spread on base rate	0.75%
ABL Revolver [Member] \| Base Rate [Member] \| CANADA \| Minimum [Member]
Secured Leverage Ratio [Abstract]
Basis spread on base rate	0.25%
ABL Revolver [Member] \| Base Rate [Member] \| CANADA \| Maximum [Member]
Secured Leverage Ratio [Abstract]
Basis spread on base rate	0.75%
Term Loan B [Member]
Borrowings [Abstract]
Long-term debt		$ 250,000	0
Secured Leverage Ratio [Abstract]
December 31, 2017		5.75%
March 31, 2018		5.75%
June 30, 2018		5.50%
September 30, 2018		5.50%
December 31, 2018		5.25%
March 31, 2019		5.25%
June 30, 2019		5.00%
September 30, 2019		5.00%
December 31, 2019		4.75%
March 31, 2020		4.75%
June 30, 2020 and each Fiscal Quarter thereafter		4.50%
Secured Leverage Ratio		3.61%
Debt instrument term		6 years
Debt instrument face amount	$ 250,000
Amortization in quarterly installments	0.25%
Maturity date		Aug. 31, 2023
Incremental increase in term loan	$ 30,000
Percentage of excess cash flow	50.00%
Reduction in percentage of excess cash flow, condition one	25.00%
Debt instrument leverage ratio, condition one	3.00
Reduction in percentage of excess cash flow, condition two	0.00%
Debt instrument leverage ratio, condition two	2.50
Interest rate		6.70%
Term Loan B [Member] \| Minimum [Member]
Secured Leverage Ratio [Abstract]
Incremental increase in term loan	$ 10,000
Term Loan B [Member] \| Maximum [Member]
Secured Leverage Ratio [Abstract]
Secured debt covenant amount net of restricted cash		$ 30,000
Debt instrument secured leverage ratio	3.60
Fixed charge coverage ratio	1.00
Line of Credit [Member]
Borrowings [Abstract]
Long-term debt		0	147,600
Term Loan [Member]
Borrowings [Abstract]
Long-term debt		0	74,500
Promissory Note Payable [Member]
Borrowings [Abstract]
Long-term debt		$ 2,938	$ 3,577
Secured Leverage Ratio [Abstract]
Interest rate		2.90%