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Income Taxes - Components of Provision for Federal Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Current $ 88,535 $ 74,168 $ 70,011
Deferred 19,884 9,615 2,006
Total $ 108,419 $ 83,783 $ 72,017