Variable Interest Entities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended			3 Months Ended		12 Months Ended	0 Months Ended	1 Months Ended	3 Months Ended			6 Months Ended			12 Months Ended			1 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Sep. 30, 2014 Subsequent Event [Member]	Jun. 30, 2013 PEAKS Guarantee [Member]	Dec. 31, 2012 PEAKS Guarantee [Member]	Oct. 09, 2014 PEAKS Guarantee [Member] Subsequent Event [Member]	Dec. 31, 2014 PEAKS Guarantee [Member] Subsequent Event [Member]	Jun. 30, 2013 2009 RSA [Member]	Dec. 31, 2012 2009 RSA [Member]	Jun. 30, 2012 2009 RSA [Member]	Jun. 30, 2013 2009 RSA [Member] Installment	Jun. 30, 2012 2009 RSA [Member]	Jun. 30, 2013 PEAKS Trust Student Loans [Member]	Dec. 31, 2012 PEAKS Trust Student Loans [Member]	Feb. 28, 2013 PEAKS Trust Student Loans [Member]	Jun. 30, 2012 PEAKS Trust Student Loans [Member]	Jan. 31, 2014 PEAKS Trust Student Loans [Member] Subsequent Event [Member]	Jun. 30, 2013 PEAKS Trust Student Loans [Member] 2014 Payment [Member]	Jun. 30, 2013 2009 Entity [Member]	Jun. 30, 2013 2009 Entity [Member]
Variable Interest Entity [Line Items]
Imputed interest rate			9.00%
Subordinated Note, maturity date			2026-03
Subordinated Notes					$ 73,000
Carrying value of Revolving and Subordinated note											2,600	2,900	8,400	2,600	8,400		0		10,200
Impairment charge												4,900					10,300
Payments under PEAKS guarantee						51,700	60,340	12,342	50,000	159,500											40,000
Amount of liabilities exceeding fair value assets																		112,748
Reduction in excess of increase in fair value of liabilities over assets.																		39,500
Loss on consolidation of PEAKS Trust	0	0	(73,248)	0												(73,248)
Payments on Behalf of Borrowers	3,290	0	5,145	0																8,186			8,600
Number of monthly payments														10
Discount rate														10.00%
Amount offset against 2009 Entity under the Revolving Note																						7,577	8,114
Amounts relating to discharge payments	6,786		6,786
Recoveries from charged-off loans	0	50	103	87							0		50	103	87
Advances to 2009 Entity			0	0
Revolving note, amount owned to company	8,200	8,700	8,200	8,700	8,300
Carrying value of subordinated note and revolving note prior to impairment charge											$ 7,800			$ 7,800