PEAKS Trust Student Loans - Schedule of Information Regarding Aggregate Changes in Accretable Yield (Detail) - PEAKS Trust [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 70,580	$ 0
Additions resulting from the Consolidation	0	100,953
Accretion	(3,133)	(1,360)
Reclassification from nonaccretable difference and changes in expected cash flows	5,904	0
Balance at end of period	73,351	99,593
Analogy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	42,274	0
Additions resulting from the Consolidation	0	58,843
Accretion	(1,803)	(732)
Reclassification from nonaccretable difference and changes in expected cash flows	4,153	0
Balance at end of period	$ 44,624	$ 58,111