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Pensions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
U.S. Benefit Plans
   
Defined Benefit Plan Disclosure [Line Items]    
Contribution to defined benefit plan $ 1.3 $ 1.2
Expected contribution to defined benefit plan 6.8  
Non-U.S. Benefit Plan
   
Defined Benefit Plan Disclosure [Line Items]    
Contribution to defined benefit plan 0.4 1.0
Expected contribution to defined benefit plan $ 2.3