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Income Taxes - Components of Pre-tax Income and Comprehensive Provision for Income Taxes (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2012
Reconciliation Of Income Taxes [Line Items]  
U.S. federal statutory income tax rate 35.00%
Tax Provision Excluding Discontinued Operations [Member]
 
Reconciliation Of Income Taxes [Line Items]  
U.S. federal statutory income tax rate 35.00%