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FINANCING RECEIVABLES (Credit Risk Profiles of Institutional Student Loan Balance) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivables [Line Items]    
Institutional Student Loans $ 66,048us-gaap_NotesReceivableGross $ 62,187us-gaap_NotesReceivableGross
Credit Risk Profiles Of Institutional Student Loans [Member]    
Financing Receivables [Line Items]    
Institutional Student Loans 66,048us-gaap_NotesReceivableGross
/ dv_StudentLoansAxis
= dv_CreditRiskProfilesOfInstitutionalStudentLoansMember		 62,187us-gaap_NotesReceivableGross
/ dv_StudentLoansAxis
= dv_CreditRiskProfilesOfInstitutionalStudentLoansMember
Performing | Credit Risk Profiles Of Institutional Student Loans [Member]    
Financing Receivables [Line Items]    
Institutional Student Loans 47,620us-gaap_NotesReceivableGross
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PerformingFinancingReceivableMember
/ dv_StudentLoansAxis
= dv_CreditRiskProfilesOfInstitutionalStudentLoansMember		 46,107us-gaap_NotesReceivableGross
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_PerformingFinancingReceivableMember
/ dv_StudentLoansAxis
= dv_CreditRiskProfilesOfInstitutionalStudentLoansMember
Nonperforming | Credit Risk Profiles Of Institutional Student Loans [Member]    
Financing Receivables [Line Items]    
Institutional Student Loans $ 18,428us-gaap_NotesReceivableGross
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_NonperformingFinancingReceivableMember
/ dv_StudentLoansAxis
= dv_CreditRiskProfilesOfInstitutionalStudentLoansMember		 $ 16,079us-gaap_NotesReceivableGross
/ us-gaap_CreditRatingAMBestAxis
= us-gaap_NonperformingFinancingReceivableMember
/ dv_StudentLoansAxis
= dv_CreditRiskProfilesOfInstitutionalStudentLoansMember