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Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Of Accounting Policies [Line Items]      
Foreign currency translation losses $ 0.6 $ 0.3 $ 1.4
Cumulative translation adjustment 10.8 (0.3)  
Restricted cash 1.0    
Selling, General and Administrative Expenses
      
Significant Of Accounting Policies [Line Items]      
Research and development expenses $ 10.0 $ 12.1 $ 10.4
UNITED STATES | Labor Force Concentration Risk
      
Significant Of Accounting Policies [Line Items]      
Concentration risk, percentage 41.00%    
UNITED STATES | Unionized Employees Concentration Risk
      
Significant Of Accounting Policies [Line Items]      
Concentration risk, percentage 28.00%    
Number of employees 300    
Building | Minimum
      
Significant Of Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 8 years    
Building | Maximum
      
Significant Of Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 40 years    
Machinery and Equipment | Minimum
      
Significant Of Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 3 years    
Machinery and Equipment | Maximum
      
Significant Of Accounting Policies [Line Items]      
Property, Plant and Equipment, Useful Life 15 years    
Leasehold Improvements
      
Significant Of Accounting Policies [Line Items]      
Property, Plant and Equipment, Estimated Useful Lives over the shorter of the remaining life of the lease or the useful life of the improvement