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Difference Between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Reconciliation of Statutory Federal Tax Rate [Line Items]
Statutory tax rate	35.00%	35.00%	35.00%
State income taxes	2.50%	1.10%	4.70%
Permanent differences	(0.10%)	2.30%	(5.70%)
Other, net	(0.60%)	(0.20%)	0.10%
Effective tax rate	36.80%	38.20%	34.10%

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- Definition

Items that are deductible or taxable for tax purposes only. These items are not treated as revenue or expense for book purposes.

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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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-Publisher FASB

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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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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by the state and local income tax expense or benefit, net of the federal tax benefit (expense) thereon, recorded during the period.

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