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Income Tax Expense Benefit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal							$ 476
State					61	16	34
Total Current					61	16	510
Deferred:
Federal					7,361	(494)	246
State					1,298	(82)	41
Total Deferred					8,659	(576)	287
Income tax expense (benefit)	$ 8	$ 11,468	$ 17	$ 8,720	$ 8,720	$ (560)	$ 797

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.