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Pensions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
U.S. Benefit Plans
   
Defined Benefit Plan Disclosure [Line Items]    
Contribution to defined benefit plan $ 2.8 $ 3.2
Expected contribution to defined benefit plan 6.8  
Non-U.S. Benefit Plan
   
Defined Benefit Plan Disclosure [Line Items]    
Contribution to defined benefit plan 0.8 1.2
Expected contribution to defined benefit plan $ 2.3