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Income Taxes - Reconciliation of Income Tax Expense (Benefit) Related to Continuing Operations Applicable Federal Statutory Rate and Effective Rates from Continuing Operations (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effective Income Tax Rate Reconciliation [Line Items]      
Statutory rate 35.00% 35.00% 34.00%