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Variable Interest Entities - Guarantee and Other Payments Related to PEAKS Program (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Variable Interest Entity [Line Items]        
Payments on Behalf of Borrowers $ 0esi_PaymentsOnBehalfOfBorrowers $ 2,502esi_PaymentsOnBehalfOfBorrowers $ 1,832esi_PaymentsOnBehalfOfBorrowers $ 7,647esi_PaymentsOnBehalfOfBorrowers
PEAKS Program [Member]        
Variable Interest Entity [Line Items]        
PEAKS Guarantee 52,517esi_GuaranteePaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 138esi_GuaranteePaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 94,318esi_GuaranteePaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 1,377esi_GuaranteePaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember
Payments on Behalf of Borrowers 0esi_PaymentsOnBehalfOfBorrowers
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 2,502esi_PaymentsOnBehalfOfBorrowers
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 1,832esi_PaymentsOnBehalfOfBorrowers
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 7,647esi_PaymentsOnBehalfOfBorrowers
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember
Total $ 52,517esi_GuaranteeAndOtherPaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 $ 2,640esi_GuaranteeAndOtherPaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 $ 96,150esi_GuaranteeAndOtherPaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember		 $ 9,024esi_GuaranteeAndOtherPaymentsRelatedToPEAKSProgram
/ us-gaap_GuaranteeObligationsByNatureAxis
= esi_PeaksProgramMember