Commitments and Contingencies - Historical and Projected Performance and Collections of the CUSO Student Loans under the CUSO RSA (Parenthetical) (Detail) $ in Thousands	7 Months Ended
Dec. 31, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Deferred payments, gross	$ 6,092
Recoveries from charged-off loans	$ 761

The amount of recoveries from loans previously charged off that were due, but not paid, to the reporting entity that were offset against guarantee payments made to the variable interest entity that were deferred in accordance with an agreement.

No definition available.

Name:	esi_RecoveriesOfLoansPreviouslyChargedOffDeferredOffset
Namespace Prefix:	esi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration