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Variable Interest Entities - Schedule of Payments Made to Entity Related to Guarantee Obligations (Detail) (CUSO RSA [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
CUSO RSA [Member]
    
Variable Interest Entity [Line Items]    
Regular Payments $ 6,562esi_GuaranteeObligationsRegularPayments
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_CusoRiskShareAgreementMember		 $ 1,791esi_GuaranteeObligationsRegularPayments
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_CusoRiskShareAgreementMember
Discharge Payments 2,577esi_GuaranteeObligationsDischargePayments
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_CusoRiskShareAgreementMember		 912esi_GuaranteeObligationsDischargePayments
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_CusoRiskShareAgreementMember
Recoveries from Charged-Off Loans 0esi_RecoveriesFromChargedOffLoans
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_CusoRiskShareAgreementMember		 (103)esi_RecoveriesFromChargedOffLoans
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_CusoRiskShareAgreementMember
Net guarantee obligation payments $ 9,139esi_GuaranteeObligationsPaymentsNetOfRecoveries
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_CusoRiskShareAgreementMember		 $ 2,600esi_GuaranteeObligationsPaymentsNetOfRecoveries
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_CusoRiskShareAgreementMember