Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Federal income tax rate to the actual effective income tax rate for continuing operations
Federal tax (benefit) rate	(34.00%)	(34.00%)
Increase (decrease) in taxes resulting from:
State income taxes	(5.80%)	(5.80%)
Change in valuation allowance	24.50%	39.30%
Permanent differences	15.30%	0.30%
Minimum tax	0.70%	0.80%
Effective income tax rate, continuing operations	0.70%	0.60%