Contingencies - Activity With Respect to Claims and Contingencies (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period	$ 129,515	$ 38,648	$ 125,880	$ 126,978
Payments on Behalf of Borrowers	0	(3,290)	(1,832)	(5,145)
Elimination of intercompany transactions	1,088	3,290	43,633	4,275
Additional accruals	0	0	0	(46,114)
Claims and contingencies, Balance at end of period	126,074	38,952	126,074	38,952
Payments, net	(1,589)	(77)	(2,747)	(280)
2009 RSA [Member]
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period			116,923
Additional accruals	0	0	0	3,803
Claims and contingencies, Balance at end of period	113,477	31,982	113,477	31,982
Other claims and contingencies [Member]
Schedule of Claims and Contingencies [Line Items]
Claims and contingencies, Balance at beginning of period			8,957
Additional accruals	7,449	2,845	16,213	7,158
Claims and contingencies, Balance at end of period	12,597	6,970	12,597	6,970
Payments, net	(9,301)	(2,464)	(13,272)	(5,207)
PEAKS Program Guarantee [Member]
Schedule of Claims and Contingencies [Line Items]
Payments, net	(1,088)	0	(41,801)	(516)
2007 RSA [Member]
Schedule of Claims and Contingencies [Line Items]
Payments, net	$ 0	$ 0	$ 0	$ (46,000)