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Stock-Based Compensation Plans (Narrative) (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 2,600,000 $ 1,500,000 $ 6,700,000 $ 4,600,000    
Number of options outstanding 2,745,151   2,745,151   2,820,285 2,513,327
Weighted-average vesting period, in years     2 years      
Stock Options [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense 737,000 221,000 1,800,000 602,000    
Restricted Stock [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense 1,800,000 1,300,000 4,900,000 4,000,000    
Non-Qualified Stock Options [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of options outstanding 2,481,816   2,481,816      
Incentive Stock Options [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of options outstanding 263,335   263,335      
Non-Vested Stock Options [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost 3,000,000   3,000,000      
Weighted-average vesting period, in years     2 years      
Time-Based Restricted Stock Awards [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 57,044   65,877      
Restricted stock shares granted during period 2,819   186,898      
Time-Based Restricted Stock Awards [Member] | Senior Management [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock shares granted during period     4,497      
Performance-Based Restricted Stock Awards [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 6,338   6,338      
Restricted stock shares granted during period 0   149,479      
Vesting range, minimum     0.00%      
Vesting range, maximum     200.00%      
Performance-Based Restricted Stock Awards [Member] | Senior Management [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock shares granted during period     112,889      
Non-Vested Restricted Stock Awards [Member]
           
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation cost $ 10,000,000   $ 10,000,000