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Debt - Estimated Principal Payments on the PEAKS Senior Debt in the Period (Detail) (PEAKS Senior Debt [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Feb. 28, 2013
PEAKS Senior Debt [Member]
   
Debt Instrument [Line Items]    
2015 $ 37,545us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_DebtInstrumentAxis
= esi_PeaksSeniorDebtMember
 
2016 12,226us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_DebtInstrumentAxis
= esi_PeaksSeniorDebtMember
 
2017 8,830us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_DebtInstrumentAxis
= esi_PeaksSeniorDebtMember
 
2018 9,678us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_DebtInstrumentAxis
= esi_PeaksSeniorDebtMember
 
2019 10,673us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
/ us-gaap_DebtInstrumentAxis
= esi_PeaksSeniorDebtMember
 
2020 17,966us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_DebtInstrumentAxis
= esi_PeaksSeniorDebtMember
 
Total $ 96,918esi_DebtOutstandingPrincipalBalance
/ us-gaap_DebtInstrumentAxis
= esi_PeaksSeniorDebtMember
$ 257,533esi_DebtOutstandingPrincipalBalance
/ us-gaap_DebtInstrumentAxis
= esi_PeaksSeniorDebtMember