Quarterly report pursuant to Section 13 or 15(d)

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

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Significant Accounting Policies - Effects of Prior Period Errors in Condensed Consolidated Statements of Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net income $ 118,873 $ 107,931
Total comprehensive income 108,857 117,428
As Previously Reported [Member]
    
Net income 118,856 108,162
Total comprehensive income $ 108,840 $ 117,659