The amount of recoveries from charged-off loans that were owed to the reporting entity by the variable interest entity that were offset against amounts the reporting entity owed to the variable interest entity.

No definition available.

Name:	esi_RecoveriesOwedToReportingEntityOffsetAgainstAmountsOwedToVariableInterestEntity
Namespace Prefix:	esi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Commitments and Contingencies - Aggregate Amount of Guarantee Payments (Parenthetical) (Detail) - CUSO RSA [Member] - USD ($) $ in Thousands	3 Months Ended		7 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Regular Payments [Member]
Schedule of Claims and Contingencies [Line Items]
Recoveries of charged off loans received	$ 294	$ 290
Deferred Payments [Member]
Schedule of Claims and Contingencies [Line Items]
Recoveries of charged off loans received			$ 761