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Share-Based Compensation (Summary Of Information With Respect To All Outstanding Restricted Stock) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Jun. 30, 2012
Share-Based Compensation [Line Items]    
Outstanding, Number of Restricted Stock Shares or Units 1,797 1,797
Granted, Number of Restricted Stock Shares or Units 1,317 1,348
Vested, Number of Restricted Stock Shares or Units   (360)
Forfeited, Number of Restricted Stock Shares or Units   (380)
Outstanding, Number of Restricted Stock Shares or Units   2,405
Restricted Stock Shares [Member]
   
Share-Based Compensation [Line Items]    
Outstanding, Number of Restricted Stock Shares or Units 1,797 1,797
Vested, Number of Restricted Stock Shares or Units   (360)
Forfeited, Number of Restricted Stock Shares or Units   (302)
Outstanding, Number of Restricted Stock Shares or Units   1,135
Outstanding, Weighted Average Grant-Date Fair Value Per Share or Unit 24.74 24.74
Vested, Weighted Average Grant-Date Fair Value Per Share or Unit   24.88
Forfeited, Weighted Average Grant-Date Fair Value Per Share or Unit   25.34
Outstanding, Weighted Average Grant-Date Fair Value Per Share or Unit   24.57
Restricted Stock Units [Member]
   
Share-Based Compensation [Line Items]    
Granted, Number of Restricted Stock Shares or Units   1,348
Forfeited, Number of Restricted Stock Shares or Units   (78)
Outstanding, Number of Restricted Stock Shares or Units   1,270
Granted, Weighted Average Grant-Date Fair Value Per Share or Unit   8.58
Forfeited, Weighted Average Grant-Date Fair Value Per Share or Unit   8.63
Outstanding, Weighted Average Grant-Date Fair Value Per Share or Unit   8.58