Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities of PEAKS Trust (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Feb. 28, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Restricted cash	$ 5,636		$ 3,478
PEAKS Trust student loans, less allowance for loan losses of $0	7,730		0
PEAKS Trust student loans, excluding current portion, less allowance for loan losses of $0	76,479		0
Total assets	806,851	6,614	675,204
Current portion of PEAKS Trust senior debt	157,883		0
Other current liabilities	42,136	3,060	106,796
PEAKS Trust senior debt, excluding current portion	71,341		0
Total	691,205	46,114	549,439
PEAKS Trust Student Loans [Member]
Variable Interest Entity [Line Items]
Restricted cash	2,593	1,703
PEAKS Trust student loans, less allowance for loan losses of $0	7,730	7,282
PEAKS Trust student loans, excluding current portion, less allowance for loan losses of $0	76,479	104,834	0
Total assets	86,802	113,819
Current portion of PEAKS Trust senior debt	157,883	103,356
Other current liabilities	697	471
PEAKS Trust senior debt, excluding current portion	71,341	122,740
Total	$ 229,921	$ 226,567

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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