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INDEBTEDNESS (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]      
Ratio of Indebtedness to Net Capital 1.34us-gaap_RatioOfIndebtednessToNetCapital1    
Interest Coverage Ratio 22.7dhx_InterestCoverageRatio    
restricted payments under the Credit Agreement $ 5,000,000dhx_RestrictedPaymentsUnderCreditAgreement    
Total borrowed 110,500,000us-gaap_LongTermDebt    
Write-off of deferred financing costs 0us-gaap_WriteOffOfDeferredDebtIssuanceCost 0us-gaap_WriteOffOfDeferredDebtIssuanceCost 765,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
Long-term Debt, Fiscal Year Maturity [Abstract]      
2015 2,500,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths    
2016 5,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
2017 5,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
2018 98,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour    
Total minimum payments 110,500,000us-gaap_LongTermDebt    
Minimum [Member]      
Debt Instrument [Line Items]      
Interest Coverage Ratio 3.5dhx_InterestCoverageRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum [Member]      
Debt Instrument [Line Items]      
Ratio of Indebtedness to Net Capital 3.00us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Ratio of Indebtedness to Net Capital, Pro forma basis 2.0dhx_RatioOfIndebtednessToNetCapitalProFormaBasis
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Debt Instrument, Redemption, Period One [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Periodic Payment 625,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_RangeAxis
= us-gaap_DebtInstrumentRedemptionPeriodOneMember
   
Debt Instrument, Redemption, Period Two [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Periodic Payment 1,300,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_RangeAxis
= us-gaap_DebtInstrumentRedemptionPeriodTwoMember
   
Debt Instrument, Redemption, Period Three [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Periodic Payment 8,800,000us-gaap_DebtInstrumentPeriodicPayment
/ us-gaap_RangeAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
   
Credit Agreement [Member]      
Debt Instrument [Line Items]      
Face amount on debt 65,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
   
Number of wholly-owned subsidiaries 3dhx_NumberOfWhollyOwnedSubsidiaries
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
   
Debt issuance costs 872,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
   
Total borrowed 110,500,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
119,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
 
Long-term Debt, Fiscal Year Maturity [Abstract]      
Total minimum payments 110,500,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
119,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
 
Credit Agreement [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Interest margin 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ dhx_ReferenceRateAxis
= dhx_LiborMember
2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ dhx_ReferenceRateAxis
= dhx_LiborMember
 
Credit Agreement [Member] | LIBOR [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Interest margin 1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ dhx_ReferenceRateAxis
= dhx_LiborMember
   
Credit Agreement [Member] | LIBOR [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Interest margin 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ dhx_ReferenceRateAxis
= dhx_LiborMember
   
Credit Agreement [Member] | Base Rate [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Interest margin 0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ dhx_ReferenceRateAxis
= us-gaap_BaseRateMember
   
Credit Agreement [Member] | Base Rate [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Interest margin 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ dhx_ReferenceRateAxis
= us-gaap_BaseRateMember
   
Previous Credit Facility [Member]      
Debt Instrument [Line Items]      
Write-off of deferred financing costs 878,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
/ us-gaap_DebtInstrumentAxis
= dhx_PreviousCreditFacilityMember
   
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Maximum available to be borrowed under revolving facility 137,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
131,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Revolving Credit Facility [Member] | Credit Agreement [Member]      
Debt Instrument [Line Items]      
Maximum available to be borrowed under revolving facility 200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
   
Total borrowed 63,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
69,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Long-term Debt, Fiscal Year Maturity [Abstract]      
Total minimum payments 63,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
69,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Term Facility [Member] | Credit Agreement [Member]      
Debt Instrument [Line Items]      
Maximum available to be borrowed under revolving facility 50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= dhx_TermFacilityMember
   
Total borrowed 47,500,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= dhx_TermFacilityMember
50,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= dhx_TermFacilityMember
 
Long-term Debt, Fiscal Year Maturity [Abstract]      
Total minimum payments $ 47,500,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= dhx_TermFacilityMember
$ 50,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dhx_CreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= dhx_TermFacilityMember