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Rate Reconciliation Between Amount of Income Tax Provision at Federal Rate and Provision for (Benefit from) Taxes on Operating Profit (Loss) (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Income tax provision, federal rate	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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