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Effective Income Tax Rate (Detail)	12 Months Ended
Effective Income Tax Rate (Detail)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Provision of Income Taxes [Line Items]
At U.S. federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal effect	4.90%	4.60%	4.20%
Stock compensation	(0.70%)	(3.30%)	(5.00%)
Other permanent items	(1.60%)	(0.20%)	1.30%
Valuation allowance	(28.50%)	(36.10%)	(36.70%)
Effective income tax rate	9.10%		(1.20%)

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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