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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Reconciliation of Non-Controlling Interest Balance) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Noncontrolling Interest [Line Items]        
Balance at Beginning of Period $ 6,617us-gaap_MinorityInterest $ 5,890us-gaap_MinorityInterest $ 6,393us-gaap_MinorityInterest $ 854us-gaap_MinorityInterest
Net Income Attributable to Noncontrolling Interest 389us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 253us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 386us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 208us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Accretion of Noncontrolling Interest Put Option 1,133dv_AccretionOfNoncontrollingInterestPutOption (168)dv_AccretionOfNoncontrollingInterestPutOption 1,360dv_AccretionOfNoncontrollingInterestPutOption 4,913dv_AccretionOfNoncontrollingInterestPutOption
Balance at End of Period $ 8,139us-gaap_MinorityInterest $ 5,975us-gaap_MinorityInterest $ 8,139us-gaap_MinorityInterest $ 5,975us-gaap_MinorityInterest