PEAKS Trust Student Loans - Schedule of Estimated Fair Value, Accretable Yield and Expected Cash Flows for PEAKS Trust Student Loans (Detail) (PEAKS Trust Student Loans [Member], USD $) In Thousands, unless otherwise specified	Feb. 28, 2013
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