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Stockholders' Equity And Benefit Plans (Schedule Of Restricted Stock And Restricted Stock Unit Activity) (Detail) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning Balance, Weighted-Average Grant-Date Fair Value 269
Granted, Weighted-Average Grant-Date Fair Value 23
Vested, Weighted-Average Grant-Date Fair Value (16)
Forfeited, Weighted-Average Grant-Date Fair Value (1)
Ending Balance, Weighted-Average Grant-Date Fair Value 275
Expected to vest, Weighted-Average Grant-Date Fair Value 249
Beginning Balance, Number of Shares $ 66.60
Granted, Number of Shares $ 88.01
Vested, Number of Shares $ 69.10
Forfeited, Number of Shares $ 88.11
Ending Balance, Number of Shares $ 68.19
Expected to vest, Number of Shares $ 68.19
Fair value of restricted stock and restricted stock units, vested $ 1,200,000