Variable Interest Entities - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended			6 Months Ended		1 Months Ended	3 Months Ended		3 Months Ended			6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 2009 RSA [Member]	Mar. 31, 2014 2009 RSA [Member] Installment	Jun. 30, 2013 2009 RSA [Member]	Jun. 30, 2014 2009 RSA [Member]	Jun. 30, 2013 2009 RSA [Member]	Jan. 31, 2014 PEAKS Trust Student Loans [Member]	Mar. 31, 2013 PEAKS Trust Student Loans [Member]	Feb. 28, 2013 PEAKS Trust Student Loans [Member]	Mar. 31, 2014 PEAKS Trust Student Loans [Member] 2014 Payment [Member]	Jun. 30, 2014 2009 Entity [Member]	Jun. 30, 2013 2009 Entity [Member]	Jun. 30, 2014 2009 Entity [Member]	Jun. 30, 2013 2009 Entity [Member]	Jun. 30, 2013 2009 Entity [Member] 2009 RSA [Member]	Jun. 30, 2013 2009 Entity [Member] 2009 RSA [Member]
Variable Interest Entity [Line Items]
Imputed interest rate			9.00%
Subordinated Note, maturity date			2026-03
Amount of liabilities exceeding fair value assets													$ 112,748,000
Reduction in excess of increase in fair value of liabilities over assets.													39,500,000
Loss on consolidation of PEAKS Trust	0	0	0	(73,248,000)								73,248,000
Payments on Behalf of Borrowers	0	3,290,000	1,832,000	5,145,000							1,832,000
Prepayment of Senior debt														40,000,000
Number of monthly payments							10
Discount rate							10.00%
Recoveries from charged-off loans	0	0	0	103,000		0		0	0	103,000					256,000	173,000	475,000	227,000
Amount offset against 2009 Entity under the Revolving Note		7,577,000		8,114,000															7,577,000	8,114,000
Advances to 2009 Entity		0		0
Revolving note, amount owned to company	$ 8,200,000	$ 8,200,000	$ 8,200,000	$ 8,200,000	$ 8,200,000