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Reconciliation between Actual Tax Expense and Expected Tax Expense (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2012
Income Tax Rate Reconciliation [Line Items]
Expected income tax expense, Percent	34.00%

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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