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Multiemployer Defined Benefit Plans (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]      
Contributions $ 5,917 $ 5,462 $ 5,153
IAM
     
Defined Benefit Plan Disclosure [Line Items]      
EIN 516031295    
Plan Number 2    
Pension Protection Act Zone Status Green Green  
Contributions 269 244 238
Surcharge Imposed No    
Expiration of Collective Bargaining Agreement Dec. 31, 2013    
USW
     
Defined Benefit Plan Disclosure [Line Items]      
EIN 116166763    
Plan Number 1    
Pension Protection Act Zone Status Red Red  
FIP/ RP Status Pending/ Implemented Implemented    
Contributions $ 5,648 $ 5,218 $ 4,915
Surcharge Imposed Yes    
Expiration of Collective Bargaining Agreement Aug. 31, 2014