Notes Payable - Additional Information (Detail) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
Restricted cash held for notes payable	$ 3,100,000		$ 25,000,000
13% Senior First Lien Notes [Member]
Debt Instrument [Line Items]
Note issued	110,000,000
Cash interest payments on Notes	10,400,000
Cash interest paid on Notes	6,700,000	0	3,700,000
13% Senior Second Lien Notes [Member]
Debt Instrument [Line Items]
Note issued	20,000,000
Notes maturity date	Mar. 19, 2030
PIK Notes [Member]
Debt Instrument [Line Items]
Note issued	$ 9,800,000		$ 8,300,000