PEAKS Trust Student Loans - Schedule of Estimated Fair Value, Accretable Yield and Expected Cash Flows for PEAKS Trust Student Loans (Detail) - PEAKS Trust [Member] $ in Thousands	Feb. 28, 2013 USD ($)
Acquired Impaired Loans Rollforward [Line Items]
Estimated fair value	$ 112,116
Accretable yield	100,953
Expected cash flows	213,069
Analogy [Member]
Acquired Impaired Loans Rollforward [Line Items]
Estimated fair value	60,177
Accretable yield	58,843
Expected cash flows	$ 119,020

The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant