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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income taxes $ 45,464 $ 45,424 $ 133,775 $ 141,811
Net income 141,950 111,873 403,985 351,755
Basic earnings per share $ 1.39 $ 1.03 $ 3.92 $ 3.09
Diluted earnings per share $ 1.32 $ 0.98 $ 3.75 $ 2.95
As Previously Reported [Member]
       
Income taxes   39,518   134,257
Net income   $ 117,779   $ 359,309
Basic earnings per share   $ 1.08   $ 3.16
Diluted earnings per share   $ 1.04   $ 3.01