XML 102 R69.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of options exercised $ 7.6 $ 1.1  
Common stock available for issue 9,840,036    
Restricted stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value at vesting date 49.4 33.0 19.9
Unrecognized compensation expense related to non-vested $ 55    
Unrecognized compensation expense related to non-vested, period for recognition, in years 1 year 6 months    
Restricted stock [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants vest over periods, in years 1 year    
Restricted stock [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants vest over periods, in years 3 years    
2013 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock available for issue 7,500,000    
2013 Plan [Member] | Restricted stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock available to grant 9,813,989    
2005 Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock available for issue 1,840,036    
Shares available for issuance to be forfeited or withheld for payment of taxes 500,000