Income Taxes - Summary of Differences Between Total Income Tax Expense Statutory Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense Benefit [Line Items]
Statutory rate applied to pre-tax (loss) income	$ (5,757)	$ 1,611	$ (7,767)
Effect of state and local income taxes, net of federal tax benefit	(847)	237	(1,142)
Valuation allowance increase (decrease)	16,808	(715)	58,322
Other	(10,204)	(782)	786
Total expense (benefit)	0	351	50,199
Effective tax rate	0.00%	7.40%	(219.76%)
Puerto Rico [Member]
Income Tax Expense Benefit [Line Items]
Statutory rate applied to pre-tax (loss) income	(5,921)
Valuation allowance increase (decrease)	7,049
Other	(1,128)
Total expense (benefit)	$ 0	$ 0	$ 0
Effective tax rate	0.00%