Variable Interest Entities - Additional Information (Detail)	1 Months Ended	3 Months Ended				6 Months Ended
	Jan. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($) Installment	Jun. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Feb. 28, 2013 USD ($)
Variable Interest Entity [Line Items]
Imputed interest rate						9.00%
Subordinated Note, maturity date						2026-03
Loss on consolidation of PEAKS Trust		$ 0		$ 0		$ 0	$ (73,248,000)
Payments on Behalf of Borrowers		0		3,290,000		1,832,000	5,145,000
Recoveries from charged-off loans		0		0		0	103,000
Amount offset against 2009 Entity under the Revolving Note				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
2009 RSA [Member]
Variable Interest Entity [Line Items]
Number of monthly payments | Installment			10
Discount rate			10.00%
Recoveries from charged-off loans		0		0		0	103,000
PEAKS Trust [Member]
Variable Interest Entity [Line Items]
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					$ 73,248,000
Payments on Behalf of Borrowers	$ 1,832,000
PEAKS Trust [Member] | 2014 Payment [Member]
Variable Interest Entity [Line Items]
Prepayment of Senior debt			$ 40,000,000
Nonaffiliated Entity [Member]
Variable Interest Entity [Line Items]
Recoveries from charged-off loans		$ 256,000		173,000		$ 475,000	227,000
Nonaffiliated Entity [Member] | 2009 RSA [Member]
Variable Interest Entity [Line Items]
Amount offset against 2009 Entity under the Revolving Note				$ 7,577,000			$ 8,114,000