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Income Taxes - Additional Information (Detail)	3 Months Ended	9 Months Ended
Income Taxes - Additional Information (Detail)	Sep. 30, 2012	Sep. 30, 2012
Effective tax rate	24.30%	25.30%
U.S. statutory income tax rate		35.00%

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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