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Stockholders' Equity And Benefit Plans (Schedule Of Stock Option And Stock Appreciation Rights Activity) (Detail) (USD $)
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, Aggregate Intrinsic Value $ 84,641
Exercised, Aggregate Intrinsic Value 240
Ending Balance, Aggregate Intrinsic Value 34,152
Exercisable at June 30, 2012, Aggregate Intrinsic Value 22,989
Nonvested at June 30, 2012, Aggregate Intrinsic Value 11,162
Expected to vest, Aggregate Intrinsic Value $ 10,180
Beginning Balance, Weighted-Average Remaining Contractual Term (Years) 6 years 7 months 6 days
Ending Balance, Weighted-Average Remaining Contractual Term (Years) 6 years 3 months 18 days
Exercisable at June 30, 2012, Weighted-Average Remaining Contractual Term (Years) 4 years 6 months
Nonvested at June 30, 2012, Weighted-Average Remaining Contractual Term (Years) 7 years 10 months 24 days
Expected to vest, Weighted-Average Remaining Contractual Term (Years) 7 years 10 months 24 days
Beginning Balance, Weighted-average Exercise Price $ 61.03
Granted, Weighted-average Exercise Price $ 131.46
Exercised, Weighted-average Exercise Price $ 28.84
Forfeited or expired, Weighted-average Exercise Price $ 0.00
Ending Balance, Weighted-average Exercise Price $ 61.81
Exercisable at June 30, 2012, Weighted-average Exercise Price $ 37.36
Nonvested at June 30, 2012, Weighted-average Exercise Price $ 82.02
Expected to vest, Weighted-average Exercise Price $ 82.02
Beginning Balance, Shares 1,193
Granted, Shares 12
Exercised, shares (4)
Forfeited or expired, shares 0
Ending Balance, Shares 1,201
Exercisable at June 30, 2012, Shares 543
Nonvested at June 30, 2012, Shares 658
Expected to vest, Shares 593