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Stock-Based Compensation (Narrative) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2012
SS/L Phantom SARs
Dec. 31, 2011
SS/L Phantom SARs
Sep. 30, 2011
SS/L Phantom SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock available for future grant under stock incentive plan 1,308,232      
Stock-based compensation liability   $ 1.3 $ 4.6  
Stock compensation, cash payments   3.9   4.3
Stock-based compensation liability, discontinued operations $ 0.5      
Stock-based awards granted 11,057