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
Mar. 31, 2013
Mar. 31, 2012
Schedule Of Income Taxes [Line Items]    
Effective tax rate 23.10% 53.00%
Income tax expense (benefit) $ 2,278 $ (3,845)
Statutory federal tax rate 35.00%