Variable Interest Entities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended	0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jan. 31, 2014	Mar. 31, 2013	Mar. 20, 2014	Dec. 31, 2013	Feb. 28, 2013
Variable Interest Entity [Line Items]
Subordinated Note, maturity date			2026-03
Gain (loss) on consolidation	$ 16,631,000	$ 0	$ 16,631,000	$ (73,248,000)
Payments on Behalf of Borrowers	0	2,502,000	1,832,000	7,647,000
Amount offset against 2009 Entity under the Revolving Note	0	357,000	0	8,471,000
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 Entity [Member]
Variable Interest Entity [Line Items]
Gain (loss) on consolidation	16,631,000		16,631,000
Number of monthly payments			10
Discount rate			10.00%
Revenue or expenses on consolidation of income	0		0
Recoveries from charged-off loans	0	186,000	475,000	413,000
Amount offset against 2009 Entity under the Revolving Note	0	357,000	0	8,471,000
2009 Entity [Member] | Fair Value [Member]
Variable Interest Entity [Line Items]
Amount of liabilities exceeded assets	94,970,000		94,970,000
2009 Entity [Member] | Carrying Value [Member]
Variable Interest Entity [Line Items]
Amount of liabilities exceeded assets	111,601,000		111,601,000
PEAKS Trust [Member]
Variable Interest Entity [Line Items]
Reduction in excess of increase in fair value of liabilities over assets									39,500,000
Gain (loss) on consolidation						(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
PEAKS Trust [Member] | Fair Value [Member]
Variable Interest Entity [Line Items]
Amount of liabilities exceeded assets									$ 112,748,000