Variable Interest Entities - Guarantee and Other Payments Related to PEAKS Program (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Variable Interest Entity [Line Items]
Payments on Behalf of Borrowers	$ 0	$ 3,290	$ 1,832	$ 5,145
PEAKS Program [Member]
Variable Interest Entity [Line Items]
PEAKS Guarantee	1,088	0	41,801	1,239
Payments on Behalf of Borrowers	0	3,290	1,832	5,145
Total	$ 1,088	$ 3,290	$ 43,633	$ 6,384