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Income Taxes - Component of Income Taxes Expenses (Parenthetical) (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Tax Expenses [Line Items]        
U.S. federal statutory income tax rate 35.00% 35.00% 35.00% 35.00%