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Income Taxes - Schedule of Differences Between Effective Rate and United States Federal Income Tax Statutory Rate (Detail)

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2010

Reconciliation Of Effective Income Tax Rate [Line Items]

Tax at statutory rate

35.00%

State income tax, net of federal benefit

2.60%

2.66%

2.42%

Non-deductible expenses

0.36%

0.32%

0.35%

Change in accrual estimates relating to uncertain tax positions

(0.15%)

0.44%

(2.81%)

Other, net

0.13%

(0.13%)

(0.10%)

Income tax provision

37.94%

^[1]

38.29%

^[1]

34.86%

[1]	The comparison of net income is affected by the change in the effective tax rate. The effective tax rate was 37.94% for the year ended December 31, 2012 as compared to 38.29% for the year ended December 31, 2011.

- Definition

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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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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