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FINANCING RECEIVABLES (Institutional Student Loans Past Due) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Institutional Student Loans, 30-59 Days Past Due $ 5,272us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue $ 4,896us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
Institutional Student Loans, 60-89 Days Past Due 1,781us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue 1,737us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
Institutional Student Loans, 90-119 Days Past Due 1,609dv_FinancingReceivableRecordedInvestmentNinetyToOneHundredNineteenDaysPastDue 1,520dv_FinancingReceivableRecordedInvestmentNinetyToOneHundredNineteenDaysPastDue
Institutional Student Loans, Greater Than 120 Days Past Due 18,428dv_FinancingReceivableRecordedInvestmentGreaterThanOneHundredTwentyDaysPastDue 16,079dv_FinancingReceivableRecordedInvestmentGreaterThanOneHundredTwentyDaysPastDue
Institutional Student Loans, Total Past Due 27,090us-gaap_FinancingReceivableRecordedInvestmentPastDue 24,232us-gaap_FinancingReceivableRecordedInvestmentPastDue
Institutional Student Loans, Current 38,958us-gaap_FinancingReceivableRecordedInvestmentCurrent 37,955us-gaap_FinancingReceivableRecordedInvestmentCurrent
Total Institutional Student Loans $ 66,048us-gaap_NotesReceivableGross $ 62,187us-gaap_NotesReceivableGross