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Stock Based Compensation (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Duration from Grant Date to Expiration Date 10 years
Non-vested Stock Option Awards [Member]
 
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options (in Dollars) 1.3
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years 73 days
Restricted Stock [Member]
 
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 3 years 146 days
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options (in Dollars) 1.1
Incentive Compensation Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 1.6
Minimum [Member] | Employee Stock Option [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years
Maximum [Member] | Employee Stock Option [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years