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Pensions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Contributions to certain multiemployer pension plans $ 0.3 $ 0.3 $ 0.2
Amortization of actuarial loss 8.1    
Cost of defined contribution pension plans 6.3 5.8 5.5
Defined Benefit Postretirement Health Coverage
      
Defined Benefit Plan Disclosure [Line Items]      
Eligible age for pension plan benefits 60    
Minimum service period to be eligible for pension plan benefits 15 years    
Accumulated postretirement benefit liabilities 1.0 1.0  
Common Stock
      
Defined Benefit Plan Disclosure [Line Items]      
Equity securities, common stock (shares) 0.9 0.9  
Equity securities, common stock 7.1 3.9  
Dividends paid 0.1 0.1  
U.S. Benefit Plans
      
Defined Benefit Plan Disclosure [Line Items]      
Expected contribution to defined benefit plan 6.8    
Accumulated postretirement benefit liabilities 177.2 154.5  
U.S. Benefit Plans | Maximum
      
Defined Benefit Plan Disclosure [Line Items]      
Weighted-average target return of pension plans 8.10%    
Non-U.S. Benefit Plan
      
Defined Benefit Plan Disclosure [Line Items]      
Expected contribution to defined benefit plan 2.3    
Accumulated postretirement benefit liabilities $ 65.6 $ 57.1