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Share-Based Compensation (Summary Of Unvested Deferred Stock Awards Activity) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted Average Grant Date Fair Value, balance at the beginning of the period $ 30.90 [1]
Weighted Average Grant Date Fair Value, Granted or assumed $ 33.66
Weighted Average Grant Date Fair Value, Vested $ 30.33
Weighted Average Grant Date Fair Value, Canceled $ 34.90
Weighted Average Grant Date Fair Value, balance at the end of the period $ 32.16
Weighted Average Grant Date Fair Value, Expected to vest $ 32.12
Unvested Shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested deferred stock awards, balance at the beginning of period 949 [1]
Number of Shares, Granted 508
Number of Shares, Vested (288)
Number of Shares, Canceled (33)
Unvested deferred stock awards, balance at the end of period 1,136
Number of shares, Expected to vest 1,114
[1] Unvested deferred stock awards represent awards where recipients have yet to satisfy either the explicit vesting terms or retirement-eligibility requirements.