Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

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Income Taxes - Additional Information (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
Schedule Of Income Taxes [Line Items]        
Effective Tax rate 24.30% (390.70%) (78.30%) 73.10%
Income tax expense (benefit) $ 3,725 $ (6,653) $ (3,007) $ (25,966)