Variable Interest Entities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended	1 Months Ended	2 Months Ended	3 Months Ended				12 Months Ended	0 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended		3 Months Ended	10 Months Ended	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Sep. 30, 2014 Subsequent Event [Member]	Mar. 31, 2013 2009 RSA [Member]	Feb. 28, 2013 2009 RSA [Member]	Mar. 31, 2013 2009 RSA [Member] Installment	Dec. 31, 2012 2009 RSA [Member]	Mar. 31, 2012 2009 RSA [Member]	Mar. 31, 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]	Mar. 31, 2013 PEAKS Trust Student Loans [Member]	Dec. 31, 2012 PEAKS Trust Student Loans [Member]	Feb. 28, 2013 PEAKS Trust Student Loans [Member]	Mar. 31, 2013 PEAKS Trust Student Loans [Member] 2014 Payment [Member]	Jan. 31, 2014 PEAKS Trust Student Loans [Member] Subsequent Event [Member]	Mar. 31, 2013 2009 Entity [Member]	Mar. 31, 2013 2009 Entity [Member] 2009 RSA [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		9,800			2,200		2,200	2,900	9,200						0
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	(73,248)	0												73,248
Payments on Behalf of Borrowers	1,855	0																11,475	8,600
Number of monthly payments							10
Discount rate							10.00%
Amount offset against 2009 Entity under the Revolving Note																				538
Recoveries from charged-off loans	103	37			0	0	103		37										54
Advances to 2009 Entity	0	0
Revolving note, amount owned to company	7,600	9,200	8,300
Carrying value of subordinated note and revolving note prior to impairment charge					$ 7,800		$ 7,800