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FAIR VALUE MEASUREMENTS (Unobservable Level 3 Inputs) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance at beginning period $ 9,793us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 9,756us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 1,557us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Additions for acquisitions 0us-gaap_BusinessCombinationContingentConsiderationLiability 4,474us-gaap_BusinessCombinationContingentConsiderationLiability 9,708us-gaap_BusinessCombinationContingentConsiderationLiability
Cash payments (5,825)dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisContingentConsiderationPayments (5,000)dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisContingentConsiderationPayments (1,557)dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisContingentConsiderationPayments
Change in estimates included in earnings 153dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisChangeInEstimatesIncludedInEarnings 197dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisChangeInEstimatesIncludedInEarnings 48dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisChangeInEstimatesIncludedInEarnings
Change due to foreign exchange rate changes (238)dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisChangeduetoforeignexchangeratechanges 366dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisChangeduetoforeignexchangeratechanges 0dhx_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisChangeduetoforeignexchangeratechanges
Balance at end of period $ 3,883us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 9,793us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 9,756us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue