Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

+ Details

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

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

+ Details

Name:	us-gaap_GoodwillForeignCurrencyTranslationGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dhx_TechAndClearanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dhx_GlobalIndustryGroupSegmentMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=dhx_HealthcareSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsegmentsAxis=dhx_FinanceReportingUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsegmentsAxis=dhx_HospitalityReportingUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SEGMENT INFORMATION (Carrying Amount of Goodwill) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 171,745
Foreign currency translation adjustment	3,045
Goodwill, ending balance	174,790
Tech & Clearance [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	94,038
Foreign currency translation adjustment	393
Goodwill, ending balance	94,431
Global Industry Group Segment [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	57,524
Foreign currency translation adjustment	1,910
Goodwill, ending balance	59,434
Healthcare Segment [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	6,269
Foreign currency translation adjustment	0
Goodwill, ending balance	6,269
Corporate & Other Segment [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	13,914
Foreign currency translation adjustment	742
Goodwill, ending balance	$ 14,656
Finance Reporting Unit [Member]
Goodwill [Roll Forward]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		20.00%	27.00%
Hospitality Reporting Unit [Member]
Goodwill [Roll Forward]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount		16.00%	19.00%