PEAKS Trust Student Loans - Schedule of Information Regarding Aggregate Changes in Accretable Yield (Detail) - PEAKS Trust [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 73,351	$ 99,593	$ 70,580	$ 0
Accretion	(3,239)	(4,104)	(6,372)	(5,464)
Reclassification from nonaccretable difference and changes in expected cash flows	(10,183)	3,986	(4,279)	3,986
Balance at end of period	59,929	99,475	59,929	99,475
Additions resulting from the Consolidation			0	100,953
Analogy [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	44,624	58,111	42,274	0
Accretion	(1,897)	(2,216)	(3,700)	(2,948)
Reclassification from nonaccretable difference and changes in expected cash flows	(6,283)	4,638	(2,130)	4,638
Balance at end of period	$ 36,444	$ 60,533	36,444	60,533
Additions resulting from the Consolidation			$ 0	$ 58,843