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Long-Term Compensation - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance shares granted   1,288,457
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 2.0 6.0
2012 Stock Awards Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate fair value   36.1
Compensation expense $ 3.0 $ 12.0