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Share-Based Compensation (Schedule Of Share And Dividend Equivalent Share Award Activity) (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of share equivalents, Beginning Balance 232,921 [1] 119,194 [1] 67,361 [1]
Number of share equivalents, Granted 119,038 [1] 131,099 [1] 58,124 [1]
Number of share equivalents, Forfeited share equivalents (10,949) [1] (5,917) [1] (1,250) [1]
Number of share equivalents, Vested share equivalents (22,281) [1] (11,455) [1] (5,041) [1]
Number of share equivalents, Ending Balance 318,729 [1] 232,921 [1] 119,194 [1]
Dividend equivalents, Beginning Balance 8,942 3,741 1,886
Dividend equivalents, Granted 9,152 6,152 2,847
Dividend equivalents, Forfeited share equivalents (367) (179) (9)
Dividend equivalents, Vested share equivalents (1,692) (772) (983)
Dividend equivalents, Ending Balance 16,035 8,942 3,741
Total share equivalents, Beginning Balance 241,863 122,935 69,247
Total share equivalents, Granted 128,190 137,251 60,971
Total share equivalents, Forfeited share equivalents (11,316) (6,096) (1,259)
Total share equivalents, Vested share equivalents (23,973) (12,227) (6,024)
Total share equivalents, Ending Balance 334,764 241,863 122,935
Value of share equivalents, Beginning Balance $ 11,924,000 $ 7,269,000 $ 3,726,000
Value of share equivalents, Granted 6,297,000 6,766,000 3,605,000
Value of share equivalents, Forfeited share equivalents 556,000 301,000 74,000
Value of share equivalents, Vested share equivalents 1,180,000 622,000 356,000
Value of share equivalents, Ending Balance $ 16,444,000 $ 11,924,000 $ 7,269,000
Market price of Company's stock $ 49.12 $ 49.30 $ 59.13
[1] Except for vested share payments, which are based on the cash paid at the time of vesting, the value of share equivalents is calculated based on the market price of the Company's stock at the end of the respective periods. The market price of the Company's stock was $49.12, $49.30, and $59.13 on December 31, 2012, 2011, and 2010, respectively.