Commitments and Contingencies - Aggregate Amount of Guarantee Payments, Discharge Payments and Payments on Behalf of Borrowers (Parenthetical) (Detail) - CUSO RSA [Member] - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Schedule of Claims and Contingencies [Line Items]
Recoveries of charged off loans received		$ 521	$ 466
Deferred payments	$ 6,092	6,092
Recoveries of charged off loans not yet received	$ 761	$ 761	$ 475

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