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Stock-Based Compensation (Summary Of Restricted Stock And Restricted Stock Units Granted) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock, shares forfeited 4,800 7,500  
Restricted stock units outstanding 42,938 29,872 14,426
Executives Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, shares 167,250 112,500 113,250
Restricted stock units, price per share $ 44.39 $ 30.87 $ 15.67
Restricted stock units, aggregate value $ 7,424 $ 3,473 $ 1,774
Percent vested 0.00% 20.00% 40.00%
Restricted stock, shares forfeited 4,800 7,500  
Directors Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, shares 6,303 9,423 1,810
Restricted stock units, price per share $ 40.45 $ 30.85 $ 29.93
Restricted stock units, aggregate value 255 291 54
Percent vested 100.00% 100.00% 100.00%
Restricted stock, shares forfeited 0 0  
Directors Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock units, shares 13,063 15,443 [1] 9,831
Restricted stock units, price per share $ 40.49 $ 29.95 $ 29.76
Restricted stock units, aggregate value $ 529 $ 463 $ 293
Percent vested 100.00% 100.00% 100.00%
Restricted stock, shares forfeited   2,013  
Restricted stock, forfeited shares price per share   $ 29.84  
[1] 2,013 shares at $29.84 per share were later forfeited in 2010.