Notes Payable - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total outstanding amounts of notes	$ 18,774,000	$ 21,743,000
Principal payments	2,969,000	10,395,000	$ 78,890,000
Cash interest paid on Notes	2,647,000	2,887,000	18,272,000
Collateral Account used for future payments	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	19,400,000
13% Senior First Lien Notes [Member]
Debt Instrument [Line Items]
Issued aggregate principal amount	$ 110,000,000
Notes maturity date	Mar. 19, 2030
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
13% Senior First And Second Lien Notes [Member]
Debt Instrument [Line Items]
Total outstanding amounts of notes	18,800,000	21,700,000
Principal payments	2,900,000	10,400,000
Cash interest paid on Notes	$ 2,600,000	$ 2,900,000	$ 5,200,000