Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Effects of Prior Period Errors in Condensed Consolidated Statements of Income (Detail)

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Significant Accounting Policies - Effects of Prior Period Errors in Condensed Consolidated Statements of Income (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income taxes $ 44,675 $ 44,801
Net income 118,873 107,931
Basic earnings per share $ 1.14 $ 0.93
Diluted earnings per share $ 1.10 $ 0.88
As Previously Reported [Member]
   
Income taxes 44,692 44,570
Net income $ 118,856 $ 108,162
Basic earnings per share $ 1.14 $ 0.93
Diluted earnings per share $ 1.10 $ 0.88