Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - (Narrative) (Detail)

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Income Taxes - (Narrative) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Taxes [Line Items]        
Income tax expense $ (2,175) $ 28,822 $ 33,959 $ 68,841
Effective tax rate 59.70% 35.30% 38.00% 35.20%
Federal statutory income tax rate     35.00% 35.00%
Forecasted [Member]
       
Income Taxes [Line Items]        
Effective tax rate     38.00%