Variable Interest Entities - Guarantee and Other Payments Related to PEAKS Program (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Variable Interest Entity [Line Items]
Payments on Behalf of Borrowers	$ 1,832	$ 1,855
PEAKS Program [Member]
Variable Interest Entity [Line Items]
PEAKS Guarantee	40,713	1,239
Payments on Behalf of Borrowers	1,832	1,855
Total	$ 42,545	$ 3,094