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Reconciliation of Company's Actual Tax Rate to U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Income tax rates
- Statutory U.S. federal rate	34.00%	34.00%
- States, net U.S. benefits	4.00%	4.00%
- Reduction of valuation allowance	(28.00%)	0.00%
Total	10.00%	38.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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