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Note I - Stock-Based Compensation (Detail) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
May 27, 2007
May 26, 2006
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 9,144,000     9,144,000 3,487,500 2,700,000
Tax Benefit from Stock Options Exercised $ 4,154,000 $ 4,718,000 $ 497,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value 10,768,000 11,684,000 5,300,000      
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)   $ 11.20 $ 8.69      
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period (in Shares)     214,000      
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number (in Shares) 1,839,000          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized 9,309,000          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2.4          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share) $ 10.97 $ 8.53 $ 4.19      
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized 13,335,000          
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition 2.9          
Related Party Transaction Restricted Shares Granted During The Period 975,371          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 3,718,000 $ 4,537,000 $ 4,223,000