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Income Before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]      
United States $ 458,635 $ 329,060 $ 210,155
Foreign 21,208 17,566 8,386
Income before income taxes $ 479,843 $ 346,626 $ 218,541