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Income Tax (Parenthetical) (Detail)	3 Months Ended		6 Months Ended
Income Tax (Parenthetical) (Detail)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes [Line Items]
Federal statutory income tax rate	35.00%	35.00%	35.00%	35.00%

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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