Reconciliation of Statutory Federal Income Tax Rate to Actual Effective Tax Rate (Detail)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 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	34.50%	39.20%
Permanent differences	5.30%	0.60%
Minimum tax	0.20%	0.50%
Effective income tax rate, continuing operations	0.20%	0.50%