FAIR VALUE MEASUREMENTS (Details)	Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
discount rate used to fair value the expected payments	2.00%

discount rate used to fair value the expected payments

No definition available.

Name:	dhx_DiscountRateUsedToFairValueExpectedPayments
Namespace Prefix:	dhx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant