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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Income Taxes [Line Items]        
Income tax expense $ 34,153 $ 29,837 $ 36,134 $ 40,019
Effective tax rate 38.90% 35.10% 38.90% 35.20%
Federal statutory income tax rate     35.00%