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Retirement Plans and Other Post-Retirement Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation for all defined benefit pension plans $ 471.1 $ 507.4  
Pension settlement charge     2.0
Manager's benchmarked performance minimum 40.00%    
Treasury bills days 90 days    
Defined contribution plans Employees contribution 50.00%    
Expense associated with Defined Contribution Plans 1.9 1.7 1.3
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 5.20% 4.28%  
Pension settlement charge       2.0
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss) 2.9    
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss) 0.3    
Pension Benefits [Member] | Minimum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 3.60%    
Pension Benefits [Member] | Maximum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 5.36%    
Other Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 4.52% 3.58%  
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss) 11.9    
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss) $ 0.5    
Other Benefits [Member] | Minimum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 3.95%    
Other Benefits [Member] | Maximum [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Discount rates 4.64%