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Employee Benefits (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Nov. 30, 2010
Employee Benefit Plans [Line Items]        
Pension and post-retirement benefit expenses $ 0.8 $ 19.0 $ 15.9 $ 8.8
Percentage of additional contribution from the company to employees' cash compensation   3.00%    
Defined contribution plan expenses 0.7 15.9 14.0 6.8
Net periodic benefit expense 0.1 3.1 1.9 2.0
Defined benefit plan, liability   7.6    
Defined benefit plan, assets   13.4    
Cost Of Sales [Member]
       
Employee Benefit Plans [Line Items]        
Pension and post-retirement benefit expenses 0.5 12.0 9.8 5.2
Selling, General And Administrative [Member]
       
Employee Benefit Plans [Line Items]        
Pension and post-retirement benefit expenses $ 0.3 $ 7.0 $ 6.1 $ 3.6