Notes Payable - Additional Information (Detail) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Outstanding amounts of notes	$ 28,808,000		$ 31,220,000
Principal payments	3,330,000	$ 78,890,000
Cash interest paid on Notes	1,951,000	5,094,000
Collateral Account used for future payments			2,400,000
Maximum [Member]
Debt Instrument [Line Items]
Collateral Account used for future payments	1,000
PIK Notes [Member]
Debt Instrument [Line Items]
Issued aggregate principal amount	19,400,000		18,500,000
Runoff Notes [Member]
Debt Instrument [Line Items]
Outstanding amounts of notes	28,800,000		31,200,000
13% Senior First Lien Notes [Member]
Debt Instrument [Line Items]
Issued aggregate principal amount	$ 110,000,000
Notes maturity date	Mar. 19, 2030
Principal payments	$ 3,300,000		$ 78,900,000
Cash interest paid on Notes	1,900,000	$ 5,100,000
13% Senior Second Lien Notes [Member]
Debt Instrument [Line Items]
Issued aggregate principal amount	$ 20,000,000
Notes maturity date	Mar. 19, 2030
Principal payments from restricted cash	$ 9,000,000