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Stock Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
2008 Stock Incentive Plan
       
Share-based Compensation Arrangement by Share-based Payment Award        
Number of shares available for issuance 20,500,000   20,500,000  
Number of shares available for grant 4,900,000   4,900,000  
Stock Option Awards
       
Share-based Compensation Arrangement by Share-based Payment Award        
Expected dividend yield     0.00%  
Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award        
Minimum vesting period of outstanding RSU awards (years)     3  
Total fair value of RSU awards vested     $ 2.0 $ 4.2
Unrecognized stock-based compensation cost 1.3   1.3  
Weighted-average recognized period (years)     6 months  
Employee Stock Option
       
Share-based Compensation Arrangement by Share-based Payment Award        
Expected dividend yield    [1]         
Weighted-average grant date fair value of options granted     $ 6.75 $ 8.99
Total intrinsic value of options exercised     10.0 9.0
Total fair value of options vested     14.5 12.6
Unrecognized stock-based compensation cost $ 42.8   $ 42.8  
Weighted-average recognized period (years)     3 years 9 months 18 days  
Employee Stock Option | 2008 Stock Incentive Plan
       
Share-based Compensation Arrangement by Share-based Payment Award        
Common Stock issued     1  
Restricted Stock | 2008 Stock Incentive Plan
       
Share-based Compensation Arrangement by Share-based Payment Award        
Common Stock issued     1.94  
[1] No options were granted during the three months ended June 30, 2012.