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Long-Term Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Performance shares granted 1,217,852
Vesting period 3 years
Aggregate fair value $ 23.9
Performance period initiation date Jan. 01, 2013
Performance period expiration date Dec. 31, 2015
Compensation expense 4.0
2012 Stock Awards Plan [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Aggregate fair value 36.1
Compensation expense $ 9.0