Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]
Current Federal	$ (374)	$ (3,652)	$ (481)
Current State	(1,210)	(5,430)	(5,350)
Total current	(1,584)	(9,082)	(5,831)
Deferred Federal
Deferred State
Total deferred
Benefit for income taxes	$ (1,584)	$ (9,082)	$ (5,831)