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Income Tax Provision - Schedule of Components of Income Tax Provision (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
U.S. federal statutory income tax rate	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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