Contingencies - Activity With Respect to Claims and Contingencies (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Schedule of Claims and Contingencies [Line Items]
Payment recoveries	$ 0	$ 103
PEAKS Program Guarantee [Member]
Schedule of Claims and Contingencies [Line Items]
Estimated recoveries	$ 0	$ 723

The cash inflow from loans reinstated and recovered that were previously deemed uncollectible.

No definition available.

Name:	us-gaap_ProceedsFromRecoveriesOfLoanPreviouslyChargedOff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration