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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Common stock available for issue 9,840,036
Restricted stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock available to grant 9,829,816
Fair value at vesting date $ 10.4
Unrecognized compensation expense related to non-vested $ 62
Unrecognized compensation expense related to non-vested, period for recognition, in years 1 year 7 months 13 days
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
Shares available for issuance to be forfeited or witheld for payment of income taxes 500,000
2005 Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Common stock available for issue 1,840,036