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Variable Interest Entities - Guarantee and Other Payments Related to PEAKS Program (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Variable Interest Entity [Line Items]    
Payments on Behalf of Borrowers $ 1,832esi_PaymentsOnBehalfOfBorrowers $ 11,499esi_PaymentsOnBehalfOfBorrowers
PEAKS Program [Member]    
Variable Interest Entity [Line Items]    
PEAKS Guarantee 159,255esi_GuaranteePaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 2,413esi_GuaranteePaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember
Payments on Behalf of Borrowers 1,832esi_PaymentsOnBehalfOfBorrowers
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 11,499esi_PaymentsOnBehalfOfBorrowers
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember
Total $ 161,087esi_GuaranteeAndOtherPaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 $ 13,912esi_GuaranteeAndOtherPaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember